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Last change on this file since 3668 was 3668, checked in by bird, 15 years ago
weakld.c: implemented searching of unix archives files.
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1	/* $Id: weakld.c 3668 2010-09-18 14:41:20Z bird $ */
2	/** @file
3	* Weak Symbol Pre-Linker.
4	*
5	* Copyright (c) 2003 InnoTek Systemberatung GmbH
6	* Author: knut st. osmundsen <bird-srcspam@anduin.net>
7	*
8	*
9	* This program is free software; you can redistribute it and/or modify
10	* it under the terms of the GNU General Public License as published by
11	* the Free Software Foundation; either version 2 of the License, or
12	* (at your option) any later version.
13	*
14	* This program is distributed in the hope that it will be useful,
15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17	* GNU General Public License for more details.
18	*
19	* You should have received a copy of the GNU General Public License
20	* along with This program; if not, write to the Free Software
21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22	*
23	*/
24
25
26	/** @page weakld Weak Pre-Linker
27	*
28	* In order to get the weak symbols somewhat right it looks like we have to do
29	* the pass1 of the linking process in order to resolve the weak symbols.
30	*
31	*
32	*
33	* @subsection Symbols
34	*
35	* There is a couple of symbol types, but we can skip most of them for this
36	* pre-linking operation. We use one symbol type which is public or global
37	* symbols if you like. Perhaps it would be wise to divide them into separat
38	* type groups, but the choice was made to differenciate this using flags.
39	* So, symbol enumeration is done using flag masks.
40	* @todo: Finish this stuff.
41	*
42	*/
43
44	/*******************************************************************************
45	* Defined Constants And Macros *
46	*******************************************************************************/
47	#define WLDSYM_HASH_SIZE 211
48	#define OMF_MAX_REC 1024
49
50	/** helper to make verbose only output. */
51	#define WLDINFO(pWld, a) do { if (pWld->fFlags & WLDC_VERBOSE) wldInfo a; } while (0)
52
53	/** Internal error */
54	#define WLDINTERR(pWld, pMod) wldIntErr(pWld, pMod, __FILE__, __LINE__, __FUNCTION__);
55
56	//#define WLD_ENABLED_DBG
57	#ifdef WLD_ENABLED_DBG
58	#define SYMDBG(pSym, pszMsg) symDbg(pSym, pszMsg);
59	#define WLDDBG(a) wldDbg a
60	#define WLDDBG2(a) wldDbg a
61	#else
62	#define SYMDBG(pSym, pszMsg) do {} while (0)
63	#define WLDDBG(a) do {} while (0)
64	#define WLDDBG2(a) do {} while (0)
65	#endif
66
67
68	/** Helpers for checking if a symbol is defined strongly. */
69	#define SYM_IS_DEFINED(fFlags) ( (fFlags & (WLDSF_TYPEMASK \| WLDSF_WEAK)) == WLDSF_PUBLIC \
70	\|\| (fFlags & (WLDSF_TYPEMASK \| WLDSF_WEAK)) == WLDSF_COMM \
71	\|\| (fFlags & (WLDSF_TYPEMASK \| WLDSF_WEAK)) == WLDSF_IMPORT \
72	)
73
74	/** Compares a existing symbol with a new symbol. */
75	#define SYM_EQUAL(pWld, pSym, _pszName, _fFlags, _uHash, _cchName) \
76	( (pSym)->uHash == (_uHash) \
77	&& (pSym)->pszName == (_pszName) \
78	)
79
80	/** Compares a existing symbol with a potential symbol. */
81	#define SYM_EQUAL2(pWld, pSym, _pszName, _fFlags, _uHash, _cchName, _pfn) \
82	( (pSym)->uHash == (_uHash) \
83	&& !_pfn((pSym)->pszName, (_pszName), (_cchName)) \
84	&& !(pSym)->pszName[(_cchName)] \
85	)
86
87
88
89	/*******************************************************************************
90	* Header Files *
91	*******************************************************************************/
92	#include <stdio.h>
93	#include <stdlib.h>
94	#include <stdarg.h>
95	#include <string.h>
96	#include <ctype.h>
97	#include <sys/types.h>
98	#include <sys/time.h>
99	#include <sys/stat.h>
100	#include <process.h>
101	#include <sys/omflib.h>
102	#include <sys/moddef.h>
103	#include <sys/elf.h>
104	#include <ar.h>
105	#include "defs.h"
106	#include "grow.h"
107	#include "weakld.h"
108
109
110	/*******************************************************************************
111	* Structures and Typedefs *
112	*******************************************************************************/
113	/** @group OMF stuff
114	* @{ */
115
116	/** OMF record header. */
117	#pragma pack(1)
118	typedef struct OMFREC
119	{
120	unsigned char chType;
121	unsigned short cb;
122	} OMFREC, *POMFREC;
123	#pragma pack()
124
125
126	/** OMF library header. */
127	#pragma pack(1)
128	typedef struct OMFLIBHDR
129	{
130	unsigned char chType;
131	unsigned short cb;
132	unsigned long offDict;
133	unsigned short cDictBlocks;
134	unsigned char fchFlags;
135	} OMFLIBHDR, *POMFLIBHDR;
136	#pragma pack()
137
138	/** OMF library header - for combining with OMFREC. */
139	#pragma pack(1)
140	typedef struct OMFLIBHDRX
141	{
142	unsigned long offDict;
143	unsigned short cDictBlocks;
144	unsigned char fchFlags;
145	} OMFLIBHDRX, *POMFLIBHDRX;
146	#pragma pack()
147
148	/** @} */
149
150
151	/**
152	* Library structure
153	*/
154	typedef struct wldlib
155	{
156	/** Library name. */
157	const char *pszLibName;
158	/** Filehandle if open */
159	FILE *phFile;
160	/** Where in the file the library starts. */
161	off_t off;
162	/** Set if it's a OMF library, clear if it's a unix archive. */
163	unsigned fOmfLib;
164	/** Pointer to the extended dictionary (OMF) / symbol table (AR). */
165	void *pDict;
166	union
167	{
168	struct
169	{
170	/** Library header. */
171	OMFLIBHDR LibHdr;
172	} Omf;
173	struct
174	{
175	/** Later. */
176	unsigned uDummy;
177	} Ar;
178	} u;
179	/** Linked list next pointer. */
180	struct wldlib *pNext;
181	} WLDLIB, *PWLDLIB;
182
183
184	/**
185	* Module structure
186	*/
187	typedef struct wldmod
188	{
189	/** Module name. */
190	const char *pszModName;
191	/** Filehandle if open. */
192	FILE * phFile;
193	/** Module offset into the file. */
194	off_t off;
195	/** Library relation - not used for libraries added thru wld_add_object(). */
196	PWLDLIB pLib;
197	/** Pointer to the next module. */
198	struct wldmod *pNext;
199	} WLDMOD, *PWLDMOD;
200
201
202	/**
203	* Symbol structure.
204	*/
205	typedef struct wldsym
206	{
207	/** Symbol name. */
208	const char * pszName;
209	/** Weak name - for weak symbols only. */
210	const char * pszWeakName;
211	/** The full hash value. */
212	unsigned uHash;
213
214	/** Symbol flags. */
215	enum {
216	/** @group Symbol Type
217	* @{ */
218	/* Mask of the symbol type. */
219	WLDSF_TYPEMASK = 0x000f,
220	/** Strong symbol.
221	* A strong definition exists for this symbol (PUBDEF). */
222	WLDSF_PUBLIC = 0x0001,
223	/** Communal data/code.
224	* Communal definition exists for this symbol.
225	* If a PUBDEF is found for this symbol it will become strong. */
226	WLDSF_COMM = 0x0002,
227	/** Imported symbol.
228	* This symbol is imported.
229	* Note that when combined with WLDSF_LIBSEARCH a symbol in this type
230	* will yield to stronger definitions with a little warning. */
231	WLDSF_IMPORT = 0x0003,
232	/** Undefined symbol.
233	* This symbol is not yet defined anywhere. */
234	WLDSF_UNDEF = 0x0004,
235	/** Weak external.
236	* This symbol doesn't need to be resolved as it have a default
237	* resolution. pWeakDefault is pointing to the default resolution.
238	* If an non weak EXTDEF is found in another module, it will become
239	* WLDSF_UNDEF.
240	*/
241	WLDSF_WKEXT = 0x0005,
242	/** @} */
243
244	/** Uncertain undefined symbol.
245	* We're still processing the module containing this and the uncertainty
246	* we're facing is that a WLDSF_UNDEF may changed to an WLDSF_WKEXT
247	* upon encountering a WKEXT COMENT record. */
248	WLDSF_UNCERTAIN = 0x0100,
249
250	/** Symbol found during library search.
251	* If this is an attribute to a symbol of the WLDSF_IMPORT type, the
252	* symbol is actually kind of weak.
253	*/
254	WLDSF_LIBSEARCH = 0x0200,
255
256	/** Weak symbol.
257	* This symbol doesn't need to be resolved (if WLDSF_UNDEF), or
258	* it may be overridden by a EXTDEF with no WKEXT.
259	* If this is an weak undefined symbol (extern weak, local default)
260	* pWeakDefault Will point at it.
261	*/
262	WLDSF_WEAK = 0x0400,
263
264	/** Alias symbol.
265	* This symbol is an alias for another symbol. pAliasFor will be set. */
266	WLDSF_ALIAS = 0x0800,
267
268	/** Exported symbol.
269	* This symbol is to be exported. */
270	WLDSF_EXPORT = 0x1000,
271
272	/** Internal flags which indicates that the symbol was exported in
273	* the definition file. This to select symbols which only appears in
274	* __declspec(dllexport) and put them into the definition file for
275	* proper weak handling. */
276	WLDSF_EXPORT_DEF = 0x2000,
277
278	/** Internal flag to say that we've already aliased this weak
279	* in the definition file.
280	*/
281	WLDSF_WEAKALIASDONE = 0x8000
282	} fFlags;
283
284	/** The module this symbol is defined in. */
285	PWLDMOD pMod;
286
287	/** Array of modules refering this symbol. */
288	PWLDMOD * paReferers;
289
290	/** Number of modules in the array. */
291	unsigned cReferers;
292
293	/** Per type data union */
294	union type_data
295	{
296	struct import_data
297	{
298	/** @group Import Attributes
299	* Valid when type is WLDSF_IMPORT.
300	* @{ */
301	/** Import name. */
302	const char * pszImpName;
303	/** Import module. */
304	const char * pszImpMod;
305	/** Import Ordinal (WLDSF_IMPORT).
306	* 0 means no ordinal. */
307	unsigned uImpOrd;
308	/** @} */
309	} import;
310
311	struct comm_data
312	{
313	/** Size of comm object */
314	signed long cb;
315	/** Number of elements. */
316	signed long cElements;
317	} comm;
318	} u;
319
320	/** Weak default resolution.
321	* Valid if the symbol is of type WLDSF_WKEXT or have the WLDSF_WEAK flag set.
322	* Indicates a default resolution for the symbol.
323	* For WLDSF_WEAK this only make sense if the type is WLDSF_UNDEF.
324	*/
325	struct wldsym * pWeakDefault;
326
327	/** Symbol this is an alias for.
328	* Valid when WLDSF_ALIAS is set. */
329	struct wldsym * pAliasFor;
330
331	/** @group Export Attributes
332	* Valid when WLDSF_EXPORT is set.
333	* @{ */
334	/** Export flags. */
335	enum
336	{
337	/** @group Name */
338	/** Name type mask. */
339	WLDSEF_NAMEMASK = 0x03,
340	/** Default action depending on if it have an ordinal or not.
341	* If it have an ordinal it shall be non-resident, if it hasn't
342	* it shall be resident.
343	*/
344	WLDSEF_DEFAULT = 0x00,
345	/** The name shall be in the resident nametable. */
346	WLDSEF_RESIDENT = 0x01,
347	/** The name shall be in the resident nametable. */
348	WLDSEF_NONRESIDENT = 0x02,
349	/** The export shall only have ordinal. */
350	WLDSEF_NONAME = 0x03,
351	/** @} */
352	/** no idea what this implies */
353	WLDSEF_NODATA = 0x04,
354	/** From an EXPORT section of a .DEF-file. */
355	WLDSEF_DEF_FILE = 0x80
356	} fExport;
357	/** Export word count. */
358	unsigned cExpWords;
359	/** Export Ordinal.
360	* 0 means no ordinal. */
361	unsigned uExpOrd;
362	/** @} */
363
364	/** Next node in the hash bucket. */
365	struct wldsym * pHashNext;
366	} WLDSYM, *PWLDSYM;
367
368
369	/**
370	* Symbol table.
371	*/
372	typedef struct wldsymtab
373	{
374	PWLDSYM ap[WLDSYM_HASH_SIZE];
375	} WLDSYMTAB, *PWLDSYMTAB;
376
377
378	/**
379	* Weak Pre-Linker Instance.
380	*/
381	struct wld
382	{
383	/** Linker flags. */
384	unsigned fFlags;
385
386	/** Global symbols. */
387	WLDSYMTAB Global;
388
389	/** Module definition file. */
390	PWLDMOD pDef;
391
392	/** Linked list (FIFO) of objects included in the link. */
393	PWLDMOD pObjs;
394	PWLDMOD * ppObjsAdd;
395
396	/** Linked list (FIFO) of libraries to be searched in the link. */
397	PWLDLIB pLibs;
398	PWLDLIB * ppLibsAdd;
399
400	/** string pool for miscellaneous string. */
401	struct strpool * pStrMisc;
402
403	/** @group ILINK Crash Workaround
404	* @{ */
405	/** Maximum number of externals in a object module. */
406	unsigned cMaxObjExts;
407
408	/** Maximum number of externals in a library module. */
409	unsigned cMaxLibExts;
410	/** @} */
411	};
412	typedef struct wld WLD;
413
414	/** symAdd Action. */
415	typedef enum { WLDSA_NEW, WLDSA_UP, WLDSA_OLD, WLDSA_ERR } WLDSYMACTION, *PWLDSYMACTION;
416
417
418
419
420	extern void xrealloc (void ptr, size_t n);
421	extern void *xmalloc (size_t n);
422
423	/** @group Weak LD - Linker Methods (Private)
424	* @{ */
425	#ifdef WLD_ENABLED_DBG
426	static void wldDbg(const char *pszFormat, ...);
427	#endif
428	static void wldInfo(const char *pszFormat, ...);
429	static int wldWarn(PWLD pWld, const char *pszFormat, ...);
430	static int wldErr(PWLD pWld, const char *pszFormat, ...);
431	static void wldIntErr(PWLD pWld, PWLDMOD pMod, const char pszFile, unsigned iLine, const char pszFunction);
432	static unsigned pass1ReadOMFMod(PWLD pWld, PWLDMOD pMod, int fLibSearch);
433	static unsigned pass1ReadELFMod(PWLD pWld, PWLDMOD pMod, int fLibSearch);
434	/** Parameter structure for wldDefCallback(). */
435	typedef struct wldDefCallback_param
436	{
437	/** Linker instance. */
438	PWLD pWld;
439	/** Name of .def file. */
440	PWLDMOD pMod;
441	/** Callback return code. Zero ok; non-zero failure; */
442	int rc;
443	} WLDDEFCBPARAM, *PWLDDEFCBPARAM;
444	static int wldDefCallback(struct _md pMD, const _md_stmt pStmt, _md_token eToken, void *pvArg);
445	/** @} */
446
447	/** @group Weak LD - Library Methods (Private)
448	* @{ */
449	static FILE * libOpen(PWLDLIB pLib);
450	static void libClose(PWLDLIB pLib);
451	static int libLoadDict(PWLDLIB pLib);
452	static void libCloseDict(PWLDLIB pLib);
453	static int libTryLoadSymbolThruDictionary(PWLD pWld, PWLDLIB pLib, PWLDSYM pSym, unsigned *pcLoaded);
454	static int libLoadUndefSymbolsFromOmfLib(PWLD pWld, PWLDLIB pLib, PWLDSYM pSym, unsigned *pcLoaded);
455	/**
456	* Callback parameter structure used between libLoadUndefSymbolsFromArchLib
457	* and libLoadUndefSymbolsFromArchLibCallback
458	*/
459	typedef struct libLoadUndefSymbolsFromArchLib_param
460	{
461	/** The linker instance. */
462	PWLD pWld;
463	/** The library. */
464	PWLDLIB pLib;
465	/** See libLoadUndefSymbols. */
466	PWLDSYM pSym;
467	/** See libLoadUndefSymbols. */
468	unsigned *pcLoaded;
469	} WLDLIBLOADUSFALPARAM, *PWLDLIBLOADUSFALPARAM;
470	static int libLoadUndefSymbolsFromArchLibCallback(FILE pFile, const char pszName, off_t offFile, off_t cbFile, void *pvUser);
471	static int libLoadUndefSymbolsFromArchLib(PWLD pWld, PWLDLIB pLib, PWLDSYM pSym, unsigned *pcLoaded);
472	static int libLoadUndefSymbols(PWLD pWld, PWLDLIB pLib, PWLDSYM pSym, unsigned *pcLoaded);
473	/**
474	* Enumeration callback routine.
475	* @returns Any non-zero value stops the enumeration and is passed to the caller.
476	* @param pFile Stream positioned at the start of the file. Don't close.
477	* @param pszName The file name.
478	* @param offFile The offset of the file in the stream @a pFile.
479	* @param cbFile The file size.
480	* @param pvUser The user parameter.
481	*/
482	typedef int (* PFNLIBENUMFILE)(FILE pFile, const char pszName, off_t offFile, off_t cbFile, void *pvUser);
483	static int libEnumFilesArch(PWLDLIB pLib, int fAll, PFNLIBENUMFILE pfnCallback, void *pvUser);
484	static int libErr(PWLDLIB pLib, const char *pszFormat, ...);
485	static void libWarn(PWLDLIB pLib, const char *pszFormat, ...);
486	/** @} */
487
488	/** @group Weak LD - Module Methods (Private)
489	* @{ */
490	static FILE * modOpen(PWLDMOD pMod);
491	static void modClose(PWLDMOD pMod);
492	static int modErr(PWLDMOD pMod, const char *pszFormat, ...);
493	static void modWarn(PWLDMOD pMod, const char *pszFormat, ...);
494	/** @} */
495
496	/** @group Weak LD - Symbole Methods (Private)
497	* @{ */
498	typedef int (PFNSYMENUM)(PWLD pWld, PWLDSYM pSym, void pvUser);
499	static int symHaveUndefined(PWLD pWld);
500	static int symEnum(PWLD pWld, PWLDSYMTAB pSymTab, unsigned fFlags, unsigned fMask, PFNSYMENUM pfnEnum, void *pvUser);
501	static int symPrintUnDefEnum(PWLD pWld, PWLDSYM pSym, void *pvUser);
502	static int symMatchUnDef(PWLD pWld, const char *pszName, size_t cchName, PWLDSYM pSym);
503	static int symMatchUnDefOmf(PWLD pWld, const unsigned char *pachPascalString, PWLDSYM pSym);
504	/** Pointed to by the pvUser parameter of symSearchLibEnum(). */
505	typedef struct symSearchLibEnum_param
506	{
507	/** Library to search for symbols in. */
508	PWLDLIB pLib;
509	/** Number modules which was loaded. */
510	unsigned cLoaded;
511	} WLDSLEPARAM, *PWLDSLEPARAM;
512	static int symSearchLibEnum(PWLD pWld, PWLDSYM pSym, void *pvUser);
513	static inline unsigned symHash(const char* pszSym, unsigned cch, unsigned fWldCaseFlag);
514	static const char * symGetDescr(PWLDSYM pSym);
515	static void symDumpReferers(PWLDSYM pSym);
516	static void symDbg(PWLDSYM pSym, const char *pszMsg);
517	static PWLDSYM symAdd(PWLD pWld, PWLDMOD pMod, unsigned fFlags, const char *pachName, int cchName, PWLDSYMACTION peAction);
518	static PWLDSYM symAddImport(PWLD pWld, PWLDMOD pMod, int fLibSearch,
519	const char *pachName, int cchName,
520	const char *pachImpName, int cchImpName,
521	const char *pachModName, int cchModName,
522	unsigned uOrdinal);
523	static PWLDSYM symAddExport(PWLD pWld, PWLDMOD pMod, int fLibSearch,
524	unsigned fExport,
525	unsigned cExpWords,
526	const char *pachExpName, int cchExpName,
527	const char *pachIntName, int cchIntName,
528	unsigned uOrdinal);
529	static PWLDSYM symAddPublic(PWLD pWld, PWLDMOD pMod, int fLibSearch,
530	const char *pachName, int cchName,
531	unsigned long ulValue, int iSegment, int iGroup);
532	static PWLDSYM symAddUnDef(PWLD pWld, PWLDMOD pMod, int fLibSearch,
533	const char *pachName, int cchName);
534	static PWLDSYM symAddAlias(PWLD pWld, PWLDMOD pMod, int fLibSearch,
535	const char *pachAliasName, int cchAliasName,
536	const char *pachName, int cchName);
537	static PWLDSYM symAddComdef(PWLD pWld, PWLDMOD pMod, int fLibSearch,
538	const char *pachName, int cchName,
539	signed long cElements, signed long cbElement);
540	/** @} */
541
542
543
544
545
546
547
548
549
550	/*=============================================================================
551	* *
552	* *
553	* W E A K L I N K E R M E T H O D S *
554	* W E A K L I N K E R M E T H O D S *
555	* W E A K L I N K E R M E T H O D S *
556	* W E A K L I N K E R M E T H O D S *
557	* W E A K L I N K E R M E T H O D S *
558	* *
559	* *
560	============================================================================/
561
562
563	#ifdef WLD_ENABLED_DBG
564	/**
565	* Put out a debug message.
566	* @param pszFormat Format string.
567	* @param ... Format arguments.
568	*/
569	static void wldDbg(const char *pszFormat, ...)
570	{
571	va_list args;
572	fprintf(stderr, "weakld: dbg: ");
573
574	va_start(args, pszFormat);
575	vfprintf(stderr, pszFormat, args);
576	va_end(args);
577	if (pszFormat[strlen(pszFormat) - 1] != '\n')
578	fputc('\n', stderr);
579	}
580	#endif
581
582	/**
583	* Put out a info message.
584	* @param pszFormat Format string.
585	* @param ... Format arguments.
586	*/
587	static void wldInfo(const char *pszFormat, ...)
588	{
589	va_list args;
590	fprintf(stderr, "weakld: info: ");
591
592	va_start(args, pszFormat);
593	vfprintf(stderr, pszFormat, args);
594	va_end(args);
595	if (pszFormat[strlen(pszFormat) - 1] != '\n')
596	fputc('\n', stderr);
597	}
598
599	/**
600	* Put out a warning message.
601	* @param pszFormat Format string.
602	* @param ... Format arguments.
603	*/
604	static int wldWarn(PWLD pWld, const char *pszFormat, ...)
605	{
606	va_list args;
607	fprintf(stderr, "weakld: warning: ");
608
609	va_start(args, pszFormat);
610	vfprintf(stderr, pszFormat, args);
611	va_end(args);
612	if (pszFormat[strlen(pszFormat) - 1] != '\n')
613	fputc('\n', stderr);
614	return 4;
615	}
616
617	/**
618	* Put out a error message.
619	* @param pszFormat Format string.
620	* @param ... Format arguments.
621	*/
622	static int wldErr(PWLD pWld, const char *pszFormat, ...)
623	{
624	va_list args;
625	fprintf(stderr, "weakld: error: ");
626
627	va_start(args, pszFormat);
628	vfprintf(stderr, pszFormat, args);
629	va_end(args);
630	if (pszFormat[strlen(pszFormat) - 1] != '\n')
631	fputc('\n', stderr);
632	return -1;
633	}
634
635
636	/**
637	* Internal error.
638	*
639	* @returns don't return, it aborts the process.
640	* @param pWld Pointer to linker instance (optional).
641	* @param pMod Pointe to module (optional).
642	* @param pszFile File name of the error.
643	* @param iLine Line number of the error.
644	* @param pszFunction The function in which the error occured.
645	*/
646	static void wldIntErr(PWLD pWld, PWLDMOD pMod, const char pszFile, unsigned iLine, const char pszFunction)
647	{
648	fprintf(stderr, "\nweakld: ");
649	if (pMod)
650	{
651	if (pMod->pLib)
652	fprintf(stderr, "%s(%s) ", pMod->pLib->pszLibName, pMod->pszModName);
653	else
654	fprintf(stderr, "%s ", pMod->pszModName);
655	}
656	fprintf(stderr, "internal error!");
657	fprintf(stderr, "file: %s line: %d function: %s\n", pszFile, iLine, pszFunction);
658	abort();
659	}
660
661
662
663
664
665
666
667	/*=============================================================================
668	* *
669	* *
670	* L I B R A R Y M E T H O D S *
671	* L I B R A R Y M E T H O D S *
672	* L I B R A R Y M E T H O D S *
673	* L I B R A R Y M E T H O D S *
674	* L I B R A R Y M E T H O D S *
675	* *
676	* *
677	============================================================================/
678
679
680
681	/**
682	* Open this library file.
683	*
684	* @returns Pointer to open file stream.
685	* @returns NULL on failure.
686	* @param pLib Library to open.
687	*/
688	static FILE * libOpen(PWLDLIB pLib)
689	{
690	if (!pLib->phFile)
691	{
692	pLib->phFile = fopen(pLib->pszLibName, "rb");
693	if (!pLib->phFile)
694	libErr(pLib, "Failed to open library.");
695	}
696	return pLib->phFile;
697	}
698
699	/**
700	* Close this library file.
701	* @param pLib Library to close.
702	*/
703	static void libClose(PWLDLIB pLib)
704	{
705	if (pLib->phFile)
706	{
707	fclose(pLib->phFile);
708	pLib->phFile = NULL;
709	}
710	}
711
712	/**
713	* Load the dictionar for this library into memory.
714	*
715	* @returns 0 if we successfully loaded the dictionary.
716	* @returns -1 if we fail to read the dictionary into memory.
717	* @returns 1 if there is no dictionary.
718	* @param pLib Library which dictionary is to be loaded.
719	* @remark This method will open the library. libClose() must be
720	* called after this function is used.
721	*/
722	static int libLoadDict(PWLDLIB pLib)
723	{
724	#if 0
725	FILE *phFile;
726
727	/* been here, done that? */
728	if (pLib->upDict)
729	return 0;
730
731	if (pLib->fOmfLib)
732	{
733	/* check if it acutally is a library and have an ext dict */
734	if ( pLib->u.Omf.LibHdr.chType != LIBHDR
735	\|\| pLib->u.Omf.LibHdr.offDict != 0
736	\|\| pLib->u.Omf.LibHdr.cDictBlocks != 0)
737	return 1;
738	}
739	else
740	{
741	}
742
743	/* ensure it's open. */
744	phFile = libOpen(pLib);
745	if (!phFile)
746	return -1;
747
748	if (pLib->fOmfLib)
749	{
750	/* position us */
751	if (fseek(phFile, pLib->LibHdr.offDict, SEEK_SET))
752	return libErr(pLib, "Failed to seek to extended dictionary (offset %d).", (int)pLib->LibHdr.offDict);
753
754	/* read it */
755	pLib->pDict = xmalloc(pLib->LibHdr.cDictBlocks * 512);
756	if (fread(pLib->pDict, 512, pLib->LibHdr.cDictBlocks, phFile) == pLib->LibHdr.cDictBlocks)
757	return 0;
758
759	libErr(pLib, "Failed to read extended dictionary.");
760	}
761
762	free(pLib->pDict);
763	pLib->pDict = NULL;
764	return -1;
765
766	#else
767	/* till we support processing the dictionary, we pretend there is none. */
768	pLib->pDict = NULL;
769	return 1;
770	#endif
771	}
772
773	/**
774	* This closes the extended dictionary.
775	*
776	* @param pLib Library which extended dictionary should be closed.
777	* @remark Will not close the library file, libClose() must be used for that.
778	*/
779	static void libCloseDict(PWLDLIB pLib)
780	{
781	if (pLib->pDict)
782	{
783	free(pLib->pDict);
784	pLib->pDict = NULL;
785	}
786	}
787
788
789	/**
790	* Does a dictionary lookup on an undefined name.
791	*
792	* @returns 0 on non failure.
793	* @returns 42 if not found.
794	* @returns -1 on link abort error.
795	* @param pWld Linker instance.
796	* @param pLib Library to search.
797	* @param pSym Undefined symbol to search for.
798	* @param pcLoaded Number of modules which was loaded from this library.
799	*/
800	static int libTryLoadSymbolThruDictionary(PWLD pWld, PWLDLIB pLib, PWLDSYM pSym, unsigned *pcLoaded)
801	{
802	return libLoadUndefSymbols(pWld, pLib, pSym, pcLoaded); /** @todo implement this function! */
803	}
804
805
806	/**
807	* Common routine implementing libLoadUndefSymbol for OMF libraries as well as
808	* do the searching of OMF members on behalf of libLoadUndefSymbolsFromArch.
809	*
810	* @returns see libLoadUndefSymbols
811	* @param pWld Linker instance.
812	* @param pLib Library being searched. This does not have to be a
813	* OMF library.
814	* @param pLibHdr The library header read by the caller.
815	* @param offLib The offset of the library to search in the library stream.
816	* @param pSym See libLoadUndefSymbols.
817	* @param pcLoaded Number of modules which was loaded from this library.
818	*/
819	static int libLoadUndefSymbolsFromOmfLib2(PWLD pWld, PWLDLIB pLib, off_t offLib, POMFLIBHDR pLibHdr,
820	PWLDSYM pSym, unsigned *pcLoaded)
821	{
822	FILE * phFile = pLib->phFile;
823	unsigned char uchEnd1, uchEnd2;
824	OMFLIBHDR LibHdr;
825	OMFREC OmfRec;
826	off_t offCurMod = 0;
827	int fSkipRestOfModule = 0;
828	/* generic stuff */
829	unsigned long ul;
830	signed long l2, l3;
831	unsigned short us, us2, us3;
832	unsigned char uch, uch2;
833
834	/* Position the stream at the first module record. */
835	if (fseek(phFile, offLib + (pLibHdr->chType == LIBHDR ? pLibHdr->cb + 3 : 0), SEEK_SET))
836	return libErr(pLib, "Error when seeking to first module.");
837
838	if (pLibHdr->chType != LIBHDR)
839	{
840	uchEnd1 = MODEND;
841	uchEnd2 = MODEND \| REC32;
842	}
843	else
844	uchEnd1 = uchEnd2 = LIBEND;
845
846	OmfRec.chType = uchEnd1;
847	fread(&OmfRec, sizeof(OmfRec), 1, phFile);
848	while (OmfRec.chType != uchEnd1 && OmfRec.chType != uchEnd2)
849	{
850	int fRead = 0;
851	int fLoad = 0;
852	switch (OmfRec.chType)
853	{
854	case THEADR:
855	fSkipRestOfModule = 0;
856	offCurMod = ftell(phFile) - sizeof(OmfRec);
857	break;
858
859	/* read */
860	case PUBDEF: case PUBDEF \| REC32:
861	case ALIAS: case ALIAS \| REC32:
862	case COMDEF: case COMDEF \| REC32:
863	case COMDAT: case COMDAT \| REC32:
864	case COMENT: case COMENT \| REC32:
865	fRead = !fSkipRestOfModule;
866	break;
867	}
868
869	if (fRead)
870	{
871	unsigned char achBuffer[OMF_MAX_REC + 8];
872	union
873	{
874	unsigned char * puch;
875	signed char * pch;
876	unsigned short * pus;
877	signed short * ps;
878	unsigned long * pul;
879	signed long * pl;
880	void * pv;
881	} u, u1, u2;
882
883	/** macro for getting a OMF index out of the buffer */
884	#define OMF_GETINDEX() (u.puch & 0x80 ? ((u.pch++ & 0x7f) << 8) + u.pch++ : u.pch++)
885	#define OMF_BYTE() (*u.puch++)
886	#define OMF_WORD() (*u.pus++)
887	#define OMF_24BITWORD() (OMF_BYTE() \| (OMF_WORD() << 8))
888	#define OMF_DWORD() (*u.pul++)
889	#define OMF_MORE() (u.puch - &achBuffer[0] < (int)OmfRec.cb - 1 && !fLoad) /* (different from the next) */
890	#define OMF_IS32BIT() ((OmfRec.chType & REC32) != 0)
891	#define OMF_GETTYPELEN(l) \
892	do \
893	{ \
894	l = OMF_BYTE(); \
895	if (l > 128) \
896	switch (l) \
897	{ \
898	case 0x81: l = OMF_WORD(); break; \
899	case 0x84: l = OMF_24BITWORD(); break; \
900	case 0x88: l = OMF_DWORD(); break; \
901	default: \
902	libErr(pLib, "Invalid type length!");/* (different from the next) */ \
903	return -1; \
904	} \
905	} while (0)
906
907	u.pv = &achBuffer[0];
908
909	/* read it */
910	if (fread(achBuffer, OmfRec.cb, 1, phFile) != 1)
911	{
912	libErr(pLib, "Read error. (2)");
913	break;
914	}
915
916	/* extract public symbols. */
917	switch (OmfRec.chType)
918	{
919	case COMENT: case COMENT \| REC32:
920	uch = OMF_BYTE(); /* comment type */
921	uch = OMF_BYTE(); /* comment class */
922	switch (uch)
923	{
924	case CLASS_PASS:
925	fSkipRestOfModule = 1;
926	break;
927	case CLASS_OMFEXT:
928	{
929	switch (OMF_BYTE())
930	{ /*
931	* Import definition.
932	*/
933	case OMFEXT_IMPDEF:
934	{
935	uch = OMF_BYTE(); /* flags */
936	u1 = u; u.pch += 1 + u.puch; / internal name */
937	u2 = u; u.pch += 1 + u.puch; / module name */
938	ul = 0; /* ordinal */
939	if (uch & 1)
940	ul = OMF_WORD();
941	if (symMatchUnDefOmf(pWld, u1.pch, pSym))
942	fLoad = 1;
943	break;
944	}
945	}
946	}
947	} /* comment class */
948	break;
949
950	case PUBDEF: case PUBDEF \| REC32:
951	{
952	us2 = OMF_GETINDEX(); /* group index */
953	us3 = OMF_GETINDEX(); /* segment index */
954	if (!us3)
955	us = OMF_WORD(); /* base frame - ignored */
956	while (OMF_MORE())
957	{
958	u1 = u; u.pch += 1 + u.puch; / public name */
959	ul = OMF_IS32BIT() ? OMF_DWORD() : OMF_WORD();
960	us = OMF_GETINDEX(); /* typeindex */
961	if (symMatchUnDefOmf(pWld, u1.pch, pSym))
962	fLoad = 1;
963	}
964	break;
965	}
966
967	case ALIAS: case ALIAS \| REC32:
968	{
969	while (OMF_MORE())
970	{
971	u1 = u; u.pch += 1 + u.puch; / alias name */
972	u2 = u; u.pch += 1 + u.puch; / substitutt name. */
973	if (symMatchUnDefOmf(pWld, u1.pch, pSym))
974	fLoad = 1;
975	}
976	break;
977	}
978
979	case COMDEF: case COMDEF \| REC32:
980	{
981	while (OMF_MORE())
982	{
983	u1 = u; u.pch += 1 + u.puch; / communal name (specs say 1-2 length...) */
984	us2 = OMF_GETINDEX(); /* typeindex */
985	uch2 = OMF_BYTE(); /* date type */
986	switch (uch2)
987	{
988	case COMDEF_TYPEFAR:
989	OMF_GETTYPELEN(l2); /* number of elements */
990	OMF_GETTYPELEN(l3); /* element size */
991	break;
992	case COMDEF_TYPENEAR:
993	l2 = 1; /* number of elements */
994	OMF_GETTYPELEN(l3); /* element size */
995	break;
996	default:
997	libErr(pLib, "Invalid COMDEF type %x.", (int)uch2);
998	return -1;
999	}
1000	if (symMatchUnDefOmf(pWld, u1.pch, pSym))
1001	fLoad = 1;
1002	}
1003	break;
1004	}
1005
1006	case COMDAT: case COMDAT \| REC32:
1007	{
1008	/* @todo */
1009	break;
1010	}
1011	} /* switch */
1012
1013	#undef OMF_GETINDEX
1014	#undef OMF_BYTE
1015	#undef OMF_WORD
1016	#undef OMF_24BITWORD
1017	#undef OMF_DWORD
1018	#undef OMF_MORE
1019	#undef OMF_IS32BIT
1020	#undef OMF_GETTYPELEN
1021
1022	/*
1023	* Shall we load this module?
1024	*/
1025	if (fLoad)
1026	{
1027	off_t offSave = ftell(phFile);
1028	PWLDMOD pMod;
1029	int rc;
1030
1031	pMod = xmalloc(sizeof(*pMod));
1032	memset(pMod, 0, sizeof(*pMod));
1033	pMod->off = offCurMod;
1034	pMod->pLib = pLib;
1035	pMod->phFile = phFile;
1036	*pWld->ppObjsAdd = pMod;
1037	pWld->ppObjsAdd = &pMod->pNext;
1038
1039	rc = pass1ReadOMFMod(pWld, pMod, 1);
1040	if (rc)
1041	{
1042	libErr(pLib, "Failed when reading module at offset %x.", (int)offCurMod);
1043	return rc;
1044	}
1045
1046	/* update statistics */
1047	if (pcLoaded)
1048	(*pcLoaded)++;
1049
1050	/* if one symbol, we're done now */
1051	if (pSym)
1052	return 0;
1053
1054	/* Resume searching, but skip the rest of this one */
1055	fSkipRestOfModule = 1;
1056	fseek(phFile, offSave, SEEK_SET);
1057	}
1058	}
1059	else
1060	{
1061	off_t offSkip = OmfRec.cb;
1062	/* Skip to next record. */
1063	if (OmfRec.chType == MODEND \|\| OmfRec.chType == (MODEND \| REC32))
1064	{
1065	unsigned cbPage = pLib->u.Omf.LibHdr.cb + 3;
1066	off_t off = ftell(phFile) + offSkip;
1067	off -= cbPage * (off / cbPage); /* don't trust this to be 2*n. /
1068	if (off)
1069	offSkip += cbPage - off;
1070	}
1071	if (fseek(phFile, offSkip, SEEK_CUR))
1072	{
1073	libErr(pLib, "Seek error.");
1074	break;
1075	}
1076	}
1077
1078	/* next header */
1079	if (fread(&OmfRec, sizeof(OmfRec), 1, phFile) != 1)
1080	{
1081	libErr(pLib, "Read error.");
1082	break;
1083	}
1084	}
1085
1086
1087	return 42;
1088	}
1089
1090
1091	/**
1092	* Implementation of libLoadUndefSymbols for OMF libraries.
1093	*
1094	* @returns see libLoadUndefSymbols
1095	* @param pWld Linker instance.
1096	* @param pLib Library to search.
1097	* @param pSym See libLoadUndefSymbols.
1098	* @param pcLoaded Number of modules which was loaded from this library.
1099	*/
1100	static int libLoadUndefSymbolsFromOmfLib(PWLD pWld, PWLDLIB pLib, PWLDSYM pSym, unsigned *pcLoaded)
1101	{
1102	return libLoadUndefSymbolsFromOmfLib2(pWld, pLib, 0, &pLib->u.Omf.LibHdr, pSym, pcLoaded);
1103	}
1104
1105	/**
1106	* Callback used by libLoadUndefSymbolsFromArchLib
1107	*
1108	* @returns 0 or -1 see libLoadUndefSymbols.
1109	* @param phFile The library stream, positioned at the start of the file.
1110	* @param pszName The (short) file name.
1111	* @param offFile The offset of the file in the stream @a pFile.
1112	* @param cbFile The file size.
1113	* @param pvUser Parameters.
1114	*/
1115	static int libLoadUndefSymbolsFromArchLibCallback(FILE pFile, const char pszName,
1116	off_t offFile, off_t cbFile, void *pvUser)
1117	{
1118	PWLDLIBLOADUSFALPARAM pParam = (PWLDLIBLOADUSFALPARAM)pvUser;
1119	size_t cbRead;
1120	int rc;
1121	union
1122	{
1123	OMFLIBHDR OmfLib;
1124	Elf32_Ehdr Ehdr;
1125	} uBuf;
1126
1127	cbRead = sizeof(uBuf);
1128	if (cbRead > cbFile)
1129	memset(&uBuf, 0, sizeof(uBuf));
1130
1131	if (fread(&uBuf, cbRead, 1, pFile) != 1)
1132	return libErr(pParam->pLib, "failed to read archive member");
1133	if (IS_ELF(uBuf.Ehdr))
1134	{
1135	WLDINFO(pParam->pWld, ("Considering AR/ELF %s(%s)\n", pParam->pLib->pszLibName, pszName));
1136	/** @todo */
1137	rc = 0;
1138	}
1139	else if ( uBuf.OmfLib.chType == THEADR
1140	\|\| uBuf.OmfLib.chType == LIBHDR)
1141	{
1142	WLDINFO(pParam->pWld, ("Considering AR/OMF %s(%s)\n", pParam->pLib->pszLibName, pszName));
1143	rc = libLoadUndefSymbolsFromOmfLib2(pParam->pWld, pParam->pLib, offFile, &uBuf.OmfLib,
1144	pParam->pSym, pParam->pcLoaded);
1145	}
1146	else
1147	{
1148	libWarn(pParam->pLib, "Skipping unknown member '%s'");
1149	rc = 0;
1150	}
1151	if (rc == 42)
1152	rc = 0;
1153	return rc;
1154	}
1155
1156
1157	/**
1158	* Implementation of libLoadUndefSymbols for unix archives.
1159	*
1160	* @returns see libLoadUndefSymbols
1161	* @param pWld Linker instance.
1162	* @param pLib Library to search.
1163	* @param pSym See libLoadUndefSymbols.
1164	* @param pcLoaded Number of modules which was loaded from this library.
1165	*/
1166	static int libLoadUndefSymbolsFromArchLib(PWLD pWld, PWLDLIB pLib, PWLDSYM pSym, unsigned *pcLoaded)
1167	{
1168	WLDLIBLOADUSFALPARAM Param;
1169	WLDINFO(pWld, ("libLoadUndefSymbolsFromArchLib - %s\n", pLib->pszLibName));
1170
1171	Param.pWld = pWld;
1172	Param.pLib = pLib;
1173	Param.pSym = pSym;
1174	Param.pcLoaded = pcLoaded;
1175	return libEnumFilesArch(pLib, 0 /fAll/, libLoadUndefSymbolsFromArchLibCallback, &Param);
1176	}
1177
1178
1179	/**
1180	* Read thru a library looking for definitions for undef symbols.
1181	* If a definition is found we'll load the module containing it.
1182	*
1183	* @returns 0 on non failure.
1184	* @returns 42 if none found.
1185	* @returns -1 on link abort error.
1186	* @param pWld Linker instance.
1187	* @param pLib Library to search.
1188	* @param pSym Undefined symbol to search for.
1189	* If NULL we'll try and see if any defined global symbol we
1190	* encounter is undefined.
1191	* @param pcLoaded Number of modules which was loaded from this library.
1192	*/
1193	static int libLoadUndefSymbols(PWLD pWld, PWLDLIB pLib, PWLDSYM pSym, unsigned *pcLoaded)
1194	{
1195	if (!pLib->fOmfLib)
1196	return libLoadUndefSymbolsFromArchLib(pWld, pLib, pSym, pcLoaded);
1197	return libLoadUndefSymbolsFromOmfLib(pWld, pLib, pSym, pcLoaded);
1198	}
1199
1200
1201	/**
1202	* Validates a numeric ar_hdr field.
1203	*
1204	* These are supposed to be padded with spaces, however, emximp seems to be
1205	* using null terminators as well (ar_mode for instance).
1206	*
1207	* @returns 0 if valid, -1 if invalid (error shown).
1208	* @param pachField The field.
1209	* @param cchField The field length.
1210	* @param uBase 10 for decimal, 8 for octal.
1211	* @param pszName The field name.
1212	*/
1213	static int libArchValidateNumField(PWLDLIB pLib, char const pachField, size_t cchField, unsigned uBase, const char pszName)
1214	{
1215	while (cchField > 0)
1216	{
1217	unsigned ch = *pachField;
1218	if (ch - '0' >= uBase)
1219	{
1220	if (ch == ' ' \|\| !ch)
1221	break;
1222	return libErr(pLib, "bad archive header field: %s", pszName);
1223	}
1224	cchField--;
1225	pachField++;
1226	}
1227
1228	while (cchField > 0)
1229	{
1230	char ch = *pachField;
1231	if (ch != ' ' && ch)
1232	return libErr(pLib, "bad archive header field: %s", pszName);
1233	cchField--;
1234	pachField++;
1235	}
1236
1237	return 0;
1238	}
1239
1240	/**
1241	* Checks the name field to see if there is a BSD style variable sized name
1242	* field following the header.
1243	*
1244	* @returns 0 if none, length if something.
1245	* @param pArHdr The archive header.
1246	*/
1247	static unsigned libArchHdrGetExtNameLen(struct ar_hdr *pArHdr)
1248	{
1249	unsigned cchExtName = 0;
1250	if (!memcmp(&pArHdr->ar_name[0], AR_EFMT1, sizeof(AR_EFMT1) - 1))
1251	{
1252	int cch = sizeof(pArHdr->ar_name) - sizeof(AR_EFMT1) - 1;
1253	const char *pch = &pArHdr->ar_name[sizeof(AR_EFMT1) - 1];
1254	while (cch-- > 0)
1255	{
1256	unsigned uDig = (unsigned char)*pch++ - '0';
1257	if (uDig > 10)
1258	break;
1259	cchExtName *= 10;
1260	cchExtName += uDig;
1261	}
1262	}
1263	return cchExtName;
1264	}
1265
1266
1267	/**
1268	* Converts the size field of the header into something we can use.
1269	* @returns ar_size as off_t.
1270	* @param pArHdr The archive header.
1271	*/
1272	static off_t libArchHdrGetSize(struct ar_hdr *pArHdr)
1273	{
1274	off_t cb = 0;
1275	int cch = sizeof(pArHdr->ar_size);
1276	const char *pch = &pArHdr->ar_size[0];
1277	while (cch-- > 0)
1278	{
1279	unsigned uDig = (unsigned char)*pch++ - '0';
1280	if (uDig > 10)
1281	break;
1282	cb *= 10;
1283	cb += uDig;
1284	}
1285	return cb;
1286	}
1287
1288
1289	/**
1290	* Enumerates the files in the unix archive.
1291	*
1292	* @returns 0 if pfnCallback returned 0 for all the files.
1293	* @returns first non-zero value pfnCallback returns (stops enumeration).
1294	* @returns -1 if the library is invalid.
1295	* @param pLib The Library to enumerate
1296	* @param fAll Whether to include the special files or not.
1297	* @param pfnCallback The callback to invoke for each file.
1298	* @param pvUser The user argument to pass to the callback.
1299	*/
1300	static int libEnumFilesArch(PWLDLIB pLib, int fAll, PFNLIBENUMFILE pfnCallback, void *pvUser)
1301	{
1302	int rc = 0;
1303	FILE *pFile = pLib->phFile;
1304	off_t offNext;
1305	char szMagic[SARMAG + 1];
1306
1307	if (pLib->fOmfLib)
1308	return libErr(pLib, "OMF library, expected ARCH!");
1309
1310	/*
1311	* Read+reverify the magic.
1312	*/
1313	if ( fseek(pFile, 0, SEEK_SET) != 0
1314	\|\| fread(&szMagic[0], SARMAG, 1, pFile) != 1)
1315	return libErr(pLib, "failed to read library magic");
1316	szMagic[SARMAG] = '\0';
1317	if (strcmp(szMagic, ARMAG) != 0)
1318	return libErr(pLib, "invalid library magic");
1319
1320	/*
1321	* Process the archive, file by file.
1322	*/
1323	offNext = SARMAG;
1324	while (!feof(pFile))
1325	{
1326	struct ar_hdr ArHdr;
1327	off_t offFile;
1328	off_t cbFile;
1329	size_t cbRead;
1330	int cchExtraName;
1331	int fSpecial;
1332	int i;
1333
1334	/* read + verify the archive header */
1335	cbRead = fread(&ArHdr, 1, sizeof(ArHdr), pFile);
1336	if (cbRead != sizeof(ArHdr))
1337	return cbRead == 0 && feof(pFile) ? 0 : libErr(pLib, "fread error");
1338	offNext += sizeof(ArHdr);
1339
1340	if (memcmp(ArHdr.ar_fmag, ARFMAG, sizeof(ArHdr.ar_fmag)))
1341	return libErr(pLib, "Bad ar_fmag value");
1342	if ( libArchValidateNumField(pLib, ArHdr.ar_date, sizeof(ArHdr.ar_date), 10, "ar_date")
1343	\|\| libArchValidateNumField(pLib, ArHdr.ar_uid, sizeof(ArHdr.ar_uid), 10, "ar_uid")
1344	\|\| libArchValidateNumField(pLib, ArHdr.ar_gid, sizeof(ArHdr.ar_gid), 10, "ar_gid")
1345	\|\| libArchValidateNumField(pLib, ArHdr.ar_mode, sizeof(ArHdr.ar_mode), 8, "ar_mode")
1346	\|\| libArchValidateNumField(pLib, ArHdr.ar_size, sizeof(ArHdr.ar_size), 10, "ar_size") )
1347	return 0; /* bitched already */
1348
1349	cbFile = libArchHdrGetSize(&ArHdr);
1350	offFile = offNext;
1351	offNext += cbFile;
1352	offNext += offNext & 1; /* make even */
1353
1354	/* skip the extended name field if present (BSD). */
1355	cchExtraName = libArchHdrGetExtNameLen(&ArHdr);
1356	if (cchExtraName)
1357	{
1358	offFile += cchExtraName;
1359	cbFile -= cchExtraName;
1360	if (fseek(pFile, cchExtraName, SEEK_CUR))
1361	return libErr(pLib, "fseek past the extended name failed");
1362	}
1363
1364	/* strip trailing spaces from the header name. */
1365	i = sizeof(ArHdr.ar_name);
1366	ArHdr.ar_name[i] = '\0';
1367	while (i-- > 0 && ArHdr.ar_name[i] == ' ')
1368	ArHdr.ar_name[i] = '\0';
1369
1370	fSpecial = !strcmp(ArHdr.ar_name, "__.SYMDEF")
1371	\|\| !strcmp(ArHdr.ar_name, "/")
1372	\|\| !strcmp(ArHdr.ar_name, "//")
1373	\|\| !strcmp(ArHdr.ar_name, "ARFILENAMES");
1374
1375	/* trailing slashes used to be fashionable. */
1376	if (!fSpecial && i > 0 && ArHdr.ar_name[i] == '/')
1377	ArHdr.ar_name[i] = '\0';
1378
1379	/* ignore the archive symbol table. */
1380	if ( fAll
1381	\|\| !fSpecial)
1382	{
1383	rc = pfnCallback(pFile, ArHdr.ar_name, offFile, cbFile, pvUser);
1384	if (rc)
1385	return rc;
1386	}
1387
1388	/* advance to the next file */
1389	if (fseek(pFile, offNext, SEEK_SET))
1390	return libErr(pLib, "seek next failed.");
1391	}
1392
1393	return 0;
1394	}
1395
1396
1397	/**
1398	* Put out an error for this library.
1399	* @returns -1.
1400	* @param pLib Library which the warning occured in.
1401	* @param pszFormat Message format.
1402	* @param ... Format args.
1403	*/
1404	static int libErr(PWLDLIB pLib, const char *pszFormat, ...)
1405	{
1406	va_list args;
1407	fprintf(stderr, "weakld: %s: error: ", pLib->pszLibName);
1408
1409	va_start(args, pszFormat);
1410	vfprintf(stderr, pszFormat, args);
1411	va_end(args);
1412	if (pszFormat[strlen(pszFormat) - 1] != '\n')
1413	fputc('\n', stderr);
1414	return -1;
1415	}
1416
1417	/**
1418	* Put out a warning for this library.
1419	* @param pLib Library which the warning occured in.
1420	* @param pszFormat Message format.
1421	* @param ... Format args.
1422	*/
1423	static void libWarn(PWLDLIB pLib, const char *pszFormat, ...)
1424	{
1425	va_list args;
1426	fprintf(stderr, "weakld: %s: warning: ", pLib->pszLibName);
1427
1428	va_start(args, pszFormat);
1429	vfprintf(stderr, pszFormat, args);
1430	va_end(args);
1431	if (pszFormat[strlen(pszFormat) - 1] != '\n')
1432	fputc('\n', stderr);
1433	}
1434
1435
1436
1437
1438
1439
1440
1441	/*=============================================================================
1442	* *
1443	* *
1444	* M O D U L E M E T H O D S *
1445	* M O D U L E M E T H O D S *
1446	* M O D U L E M E T H O D S *
1447	* M O D U L E M E T H O D S *
1448	* M O D U L E M E T H O D S *
1449	* *
1450	* *
1451	============================================================================/
1452
1453
1454	/**
1455	* Opens the module (if required) file for reading.
1456	*
1457	* @returns Pointer to file stream.
1458	* @param pMod Module to open.
1459	*/
1460	static FILE * modOpen(PWLDMOD pMod)
1461	{
1462	const char *pszFilename;
1463
1464	/* open the file */
1465	if (!pMod->phFile)
1466	{
1467	if (pMod->pLib && pMod->pLib->phFile)
1468	pMod->phFile = pMod->pLib->phFile;
1469	else
1470	{ /* fopen it */
1471	if (pMod->pLib)
1472	{
1473	pszFilename = pMod->pLib->pszLibName;
1474	pMod->phFile = pMod->pLib->phFile = fopen(pszFilename, "rb");
1475	}
1476	else
1477	{
1478	pszFilename = pMod->pszModName;
1479	pMod->phFile = fopen(pszFilename, "rb");
1480	}
1481	}
1482	}
1483
1484	/* Position the stream at the start of the module. */
1485	if (!pMod->phFile)
1486	modErr(pMod, "failed to reopen.");
1487	else
1488	{
1489	if (fseek(pMod->phFile, pMod->off, SEEK_SET))
1490	{
1491	modErr(pMod, "failed to seek to module start (%#x).", (int)pMod->off);
1492	modClose(pMod);
1493	return NULL;
1494	}
1495	}
1496
1497	return pMod->phFile;
1498	}
1499
1500	/**
1501	* Closes the module.
1502	*
1503	* @param pMod Module to close.
1504	*/
1505	static void modClose(PWLDMOD pMod)
1506	{
1507	if (!pMod->phFile)
1508	return;
1509	if (!pMod->pLib \|\| pMod->pLib->phFile != pMod->phFile)
1510	fclose(pMod->phFile);
1511	pMod->phFile = NULL;
1512	}
1513
1514	/**
1515	* Report error in module.
1516	* @param pMod Pointer to module to report error on.
1517	* @param pszFormat Format string.
1518	* @param ... Format arguments.
1519	*/
1520	static int modErr(PWLDMOD pMod, const char *pszFormat, ...)
1521	{
1522	va_list args;
1523	if (pMod->pLib)
1524	fprintf(stderr, "weakld: %s(%s) - error: ", pMod->pLib->pszLibName, pMod->pszModName);
1525	else
1526	fprintf(stderr, "weakld: %s - error: ", pMod->pszModName);
1527
1528	va_start(args, pszFormat);
1529	vfprintf(stderr, pszFormat, args);
1530	va_end(args);
1531	if (pszFormat[strlen(pszFormat) - 1] != '\n')
1532	fputc('\n', stderr);
1533	return -1;
1534	}
1535
1536	/**
1537	* Report warning in module.
1538	* @param pMod Pointer to module to report warning on.
1539	* @param pszFormat Format string.
1540	* @param ... Format arguments.
1541	*/
1542	static void modWarn(PWLDMOD pMod, const char *pszFormat, ...)
1543	{
1544	va_list args;
1545	if (pMod->pLib)
1546	fprintf(stderr, "weakld: %s(%s) - warning: ", pMod->pLib->pszLibName, pMod->pszModName);
1547	else
1548	fprintf(stderr, "weakld: %s - warning: ", pMod->pszModName);
1549
1550	va_start(args, pszFormat);
1551	vfprintf(stderr, pszFormat, args);
1552	va_end(args);
1553	if (pszFormat[strlen(pszFormat) - 1] != '\n')
1554	fputc('\n', stderr);
1555	}
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566	/*=============================================================================
1567	* *
1568	* *
1569	* S Y M B O L M E T H O D S *
1570	* S Y M B O L M E T H O D S *
1571	* S Y M B O L M E T H O D S *
1572	* S Y M B O L M E T H O D S *
1573	* *
1574	* *
1575	============================================================================/
1576
1577
1578	/**
1579	* Calculate the hash value of a symbol.
1580	* @returns hash value.
1581	* @param pszSym Symbol to calculate it for.
1582	* @param cch Symbol length.
1583	* @param fWldCaseFlag Case flag from the linker instance.
1584	* Not implemented yet.
1585	* @todo This ain't respecting case sensitivity.
1586	*/
1587	static inline unsigned symHash(const char* pszSym, unsigned cch, unsigned fWldCaseFlag)
1588	{
1589	/* hash alg: original djb2. */
1590	unsigned uHash = 5381;
1591	while ( cch
1592	&& (pszSym[0] != '$' \|\| pszSym[1] != 'w' \|\| pszSym[2] != '$')
1593	)
1594	{
1595	if ( pszSym[0] == '!'
1596	&& pszSym[1] == '_'
1597	&& cch > 200)
1598	{
1599	uHash = strtol(&pszSym[2], NULL, 16);
1600	break;
1601	}
1602	uHash += (uHash << 5) + *pszSym;
1603	pszSym++;
1604	cch--;
1605	}
1606	return uHash;
1607	}
1608
1609
1610
1611	/**
1612	* Find the symbol by the name pszName.
1613	* @returns Pointer to matching symbol.
1614	* @returns NULL if not found.
1615	* @param pWld Linker Instance.
1616	* @param pszName Name of the symbol to find.
1617	*/
1618	static PWLDSYM symLookup(PWLD pWld, const char *pszName)
1619	{
1620	PWLDSYM pSym;
1621	const char *psz;
1622	unsigned cchName;
1623	unsigned fFlags = 0;
1624	unsigned uHash = 0;
1625
1626	/*
1627	* It's easier just to add it to the string table than starting to
1628	* check the correct case function and such. As there is a good
1629	* likelyhood that the symbol exists there is little expense in doing
1630	* this compared to the convenience. If it's slow we'll optimize grow.c
1631	* (if possible) and gain everywhere.
1632	*/
1633
1634	/* look for weak suffix and trucation */
1635	cchName = strlen(pszName);
1636	for (psz = pszName + cchName - 1; psz > pszName; psz--)
1637	if ( psz[0] == '$'
1638	&& psz[1] == 'w'
1639	&& psz[2] == '$')
1640	{
1641	cchName = psz - pszName;
1642	if (cchName > 200)
1643	break;
1644	}
1645
1646	pszName = (pWld->fFlags & WLDC_CASE_INSENSITIVE ? strpool_addnu : strpool_addn)(pWld->pStrMisc, pszName, cchName);
1647	if (!fFlags)
1648	uHash = symHash(pszName, cchName, pWld->fFlags & WLDC_CASE_INSENSITIVE);
1649
1650	/* look it up */
1651	for (pSym = pWld->Global.ap[uHash % WLDSYM_HASH_SIZE]; pSym; pSym = pSym->pHashNext)
1652	if (SYM_EQUAL(pWld, pSym, pszName, fFlags, uHash, cchName))
1653	return pSym;
1654
1655	return NULL;
1656	}
1657
1658
1659
1660
1661	/**
1662	* Symbol enumerator.
1663	*
1664	* @returns return code from last pfnEnum call.
1665	* @param pWld Weak Linker Instance.
1666	* @param pSymTab The symbol table to enumerate.
1667	* @param fFlags The flags which (pSym->fFlags & fMask) much equal.
1668	* @param fMask The flag mask.
1669	* @param pfnEnum Enumeration callback function.
1670	* @param pvUser User arguments to pfnEnum.
1671	*/
1672	static int symEnum(PWLD pWld, PWLDSYMTAB pSymTab, unsigned fFlags, unsigned fMask, PFNSYMENUM pfnEnum, void *pvUser)
1673	{
1674	int i;
1675	PWLDSYM pSym;
1676	int rc;
1677
1678	for (i = 0; i < sizeof(pSymTab->ap) / sizeof(pSymTab->ap[0]); i++)
1679	{
1680	for (pSym = pSymTab->ap[i]; pSym; pSym = pSym->pHashNext)
1681	{
1682	if ((pSym->fFlags & fMask) == fFlags)
1683	{
1684	rc = pfnEnum(pWld, pSym, pvUser);
1685	if (rc)
1686	return rc;
1687	}
1688	}
1689	}
1690
1691	return 0;
1692	}
1693
1694
1695	/**
1696	* Worker for wldHaveUndefined().
1697	* @returns 42 and halts the search.
1698	* @param pWld Linker instance.
1699	* @param pSym Symbol.
1700	* @param pvUser Pointer to a FILE stream.
1701	*/
1702	static int symHaveUndefinedEnum(PWLD pWld, PWLDSYM pSym, void *pvUser)
1703	{
1704	return 42;
1705	}
1706
1707	/**
1708	* Checks if there is unresovled symbols in the link.
1709	*
1710	* @returns 1 if there is undefined symbols
1711	* @returns 0 if all symbols are defined.
1712	* @param pWld Linker instance.
1713	*/
1714	static int symHaveUndefined(PWLD pWld)
1715	{
1716	return symEnum(pWld, &pWld->Global, WLDSF_UNDEF, WLDSF_TYPEMASK \| WLDSF_WEAK, symHaveUndefinedEnum, NULL) == 42;
1717	}
1718
1719
1720	/**
1721	* Enumerates the current undefined externals and try to resolve
1722	* them using the current library passed in the pvUser structure.
1723	* @returns
1724	* @param pWld Linker instance.
1725	* @param pSym Undefined symbol.
1726	* @param pvUser Pointer to a WLDSLEPARAM structure.
1727	* fMore will be set
1728	*/
1729	static int symSearchLibEnum(PWLD pWld, PWLDSYM pSym, void *pvUser)
1730	{
1731	int rc;
1732	unsigned cLoaded = 0;
1733	PWLDSLEPARAM pParam = (PWLDSLEPARAM)pvUser;
1734
1735	SYMDBG(pSym, "Searching for");
1736
1737	/*
1738	* If we have a dictionary, we'll us it.
1739	*/
1740	if (pParam->pLib->pDict)
1741	rc = libTryLoadSymbolThruDictionary(pWld, pParam->pLib, pSym, &cLoaded);
1742	else
1743	rc = libLoadUndefSymbols(pWld, pParam->pLib, pSym, &cLoaded);
1744
1745	/* Housekeeping. */
1746	pParam->cLoaded += cLoaded;
1747	if (rc == 42) /* more undef from the load. */
1748	rc = 0;
1749
1750	return rc;
1751	}
1752
1753	/**
1754	* Worker for enumerating unresolved symbols.
1755	*
1756	* @returns 0
1757	* @param pWld Linker instance.
1758	* @param pSym Undefined symbol.
1759	* @param pvUser NULL
1760	*/
1761	static int symPrintUnDefEnum(PWLD pWld, PWLDSYM pSym, void *pvUser)
1762	{
1763	PWLDMOD pMod = pSym->pMod;
1764
1765	if (pMod)
1766	modErr(pMod, "Unresolved symbol (%s) '%s'.", symGetDescr(pSym), pSym->pszName);
1767	else
1768	wldErr(pWld, "Unresolved symbol (%s) '%s'.", symGetDescr(pSym), pSym->pszName);
1769	symDumpReferers(pSym);
1770	return 0;
1771	}
1772
1773	/**
1774	* Prints unresolved symbols.
1775	*
1776	* @param pWld Linker instance.
1777	*/
1778	static void symPrintUnDefs(PWLD pWld)
1779	{
1780	symEnum(pWld, &pWld->Global, WLDSF_UNDEF, WLDSF_TYPEMASK \| WLDSF_WEAK, symPrintUnDefEnum, NULL);
1781	}
1782
1783	/**
1784	* Checks the name with the specified undefined symbol, or all undefined
1785	* symbols.
1786	*
1787	* @returns 1 if symbol matches.
1788	* @returns 0 if symbol mis-matches.
1789	* @param pWld Linker instance.
1790	* @param pachName The symbol name.
1791	* @param cchName The length of the symbol name
1792	* @param pSym If NULL match all, if !NULL match this.
1793	*/
1794	static int symMatchUnDef(PWLD pWld, const char *pszName, size_t cchName, PWLDSYM pSym)
1795	{
1796	const char *psz;
1797	unsigned fFlags = 0;
1798	unsigned uHash = 0;
1799	int (pfn)(const char , const char *, size_t) = pWld->fFlags & WLDC_CASE_INSENSITIVE ? strnicmp : strncmp;
1800
1801	/* look for weak suffix and trucation */
1802	for (psz = pszName + cchName - 1; psz > pszName; psz--)
1803	if ( psz[0] == '$'
1804	&& psz[1] == 'w'
1805	&& psz[2] == '$')
1806	{
1807	cchName = psz - pszName;
1808	if (cchName > 200)
1809	break;
1810	}
1811
1812	/** @todo: this isn't 100% correct when we're talking case insensitivity. */
1813	if (!fFlags)
1814	uHash = symHash(pszName, cchName, pWld->fFlags & WLDC_CASE_INSENSITIVE);
1815
1816	/* compare */
1817	if (pSym)
1818	return SYM_EQUAL2(pWld, pSym, pszName, fFlags, uHash, cchName, pfn);
1819
1820	for (pSym = pWld->Global.ap[uHash % WLDSYM_HASH_SIZE]; pSym; pSym = pSym->pHashNext)
1821	{
1822	if ((pSym->fFlags & (WLDSF_TYPEMASK \| WLDSF_WEAK)) == WLDSF_UNDEF)
1823	{
1824	if (SYM_EQUAL2(pWld, pSym, pszName, fFlags, uHash, cchName, pfn))
1825	return 1;
1826	}
1827	}
1828	return 0;
1829	}
1830
1831
1832	/**
1833	* Checks the OMF encoded name with the specified undefined
1834	* symbol, or all undefined symbols.
1835	*
1836	* @returns 1 if symbol matches.
1837	* @returns 0 if symbol mis-matches.
1838	* @param pWld Linker instance.
1839	* @param pachPascalString OMF encoded string.
1840	* @param pSym If NULL match all, if !NULL match this.
1841	*/
1842	static int symMatchUnDefOmf(PWLD pWld, const unsigned char *pachPascalString, PWLDSYM pSym)
1843	{
1844	return symMatchUnDef(pWld, pachPascalString + 1, *pachPascalString, pSym);
1845	}
1846
1847
1848	/**
1849	* Makes a description of the symbol.
1850	*
1851	* @returns Pointer to static string buffer.
1852	* @param pSym Symbol to describe.
1853	*/
1854	static const char *symGetDescr(PWLDSYM pSym)
1855	{
1856	static char szDesc[256];
1857	char *psz = &szDesc[0];
1858
1859	switch (pSym->fFlags & WLDSF_TYPEMASK)
1860	{
1861	case WLDSF_PUBLIC: psz += sprintf(psz, "PUBLIC"); break;
1862	case WLDSF_COMM: psz += sprintf(psz, "COMM"); break;
1863	case WLDSF_IMPORT: psz += sprintf(psz, "IMPORT"); break;
1864	case WLDSF_UNDEF: psz += sprintf(psz, "UNDEF"); break;
1865	case WLDSF_WKEXT: psz += sprintf(psz, "WKEXT"); break;
1866	default: psz += sprintf(psz, "!!!internal error!!! "); asm("int $3"); break;
1867	}
1868	if (pSym->fFlags & WLDSF_WEAK)
1869	psz += sprintf(psz, " WEAK");
1870	if (pSym->fFlags & WLDSF_ALIAS)
1871	psz += sprintf(psz, " ALIAS");
1872	if (pSym->fFlags & WLDSF_EXPORT)
1873	psz += sprintf(psz, " EXPORT");
1874	if (pSym->fFlags & WLDSF_UNCERTAIN)
1875	psz += sprintf(psz, " UNCERTAIN");
1876
1877	return &szDesc[0];
1878	}
1879
1880
1881	/**
1882	* Dumps the list of modules referencing a symbol.
1883	*
1884	* @param pSym Symbol in question.
1885	*/
1886	static void symDumpReferers(PWLDSYM pSym)
1887	{
1888	if (pSym->cReferers)
1889	{
1890	int i;
1891	wldInfo("The symbol is referenced by:\n");
1892	for (i = 0; i < pSym->cReferers; i++)
1893	{
1894	PWLDMOD pMod = pSym->paReferers[i];
1895	if (pMod->pLib)
1896	fprintf(stderr, " %s(%s)\n", pMod->pLib->pszLibName, pMod->pszModName);
1897	else
1898	fprintf(stderr, " %s\n", pMod->pszModName);
1899	}
1900	}
1901	}
1902
1903
1904
1905	/**
1906	* Symbol debug output.
1907	* @param pSym Symbol to dump.
1908	* @param pszMsg Message to put first in the dump.
1909	*/
1910	static void symDbg(PWLDSYM pSym, const char *pszMsg)
1911	{
1912	if (pszMsg)
1913	fprintf(stderr, "weakld: dbg: %s:", pszMsg);
1914	else
1915	fprintf(stderr, "weakld: dbg:");
1916	if (pSym)
1917	fprintf(stderr, " '%s' %s", pSym->pszName, symGetDescr(pSym));
1918	else
1919	fprintf(stderr, " <Symbol is NULL>");
1920	fprintf(stderr, "\n");
1921	}
1922
1923	/**
1924	* Adds a symbol.
1925	*
1926	* Actually if the symbol exists we'll perform any required symbol 'merger' and
1927	* either fail due to symbol errors or return the 'merged' one.
1928	*
1929	* @returns Pointer to symbold.
1930	* @returns NULL on failure.
1931	* @param pWld Linker instance.
1932	* @param pMod Module the the symbol is defined in.
1933	* @param fFlags Symbol flags.
1934	* All the flags in WLDSF_TYPEMASK, WLDSF_WEAK and WLDSF_LIBSEARCH.
1935	* WLDSF_EXPORT isn't handled and should not be defined.
1936	* WLDSF_ALIAS and WLDSF_UNCERTAIN is ignored as they have no
1937	* sideeffects when resolving symbols.
1938	* @param pachName Pointer to symbol name.
1939	* @param cchName Length to add, use -1 if zeroterminated.
1940	* @param pflAction What we actually did.
1941	* WLDSA_NEW, WLDSA_UP, WLDSA_OLD, WLDSA_ERR.
1942	* @sketch
1943	*
1944	* We'll simply return existing symbol when:
1945	* 1. adding a UNDEF where a PUBLIC, COMM, !WEAK UNDEF or IMPORT exists.
1946	* 2. adding a WKEXT where a PUBLIC or COMM exists.
1947	* 3. adding a WKEXT where a UNDEF which isn't UNCERTAIN exists.
1948	* 4. adding a COMM where a !WEAK COMM or PUBLIC exists.
1949	* 5. adding a WEAK PUBLIC or WEAK COMM where a PUBLIC or COMM exists.
1950	* 6. adding a WEAK UNDEF where WEAK UNDEF exists.
1951	*
1952	* We'll warn and return existing symbol when:
1953	* 1. adding a IMPORT LIBSEARCH where a PUBLIC or COMM exists.
1954	*
1955	* We'll return upgraded existing symbol when:
1956	* 1. adding a PUBLIC, COMM or IMPORT where a UNDEF or WKEXT exists.
1957	* 2. adding a !WEAK PUBLIC or !WEAK COMM where a WEAK PUBLIC or WEAK COMM exists.
1958	* 3. adding a !WEAK UNDEF where a WEAK UNDEF exists.
1959	* 4. adding a UNDEF where a WKEXT exists.
1960	* 5. adding a IMPORT where a WEAK exists.
1961	* 6. adding a PUBLIC where a COMM exists.
1962	*
1963	* We'll warn and upgraded existing symbol when:
1964	* 1. adding a PUBLIC or COMM where a IMPORT LIBSEARCH exists.
1965	*
1966	* The rest is failures.
1967	*
1968	* There migth be errors in the algorithm. Like adding the same import twice
1969	* shouldn't harm anybody, but it's unlikely and it requires quite some extra parameters.
1970	* Also the caller must resolve any conflicting exports (which normally only yields
1971	* warnings anyway it seems).
1972	*
1973	*/
1974	static PWLDSYM symAdd(PWLD pWld, PWLDMOD pMod, unsigned fFlags, const char *pachName, int cchName, PWLDSYMACTION peAction)
1975	{
1976	PWLDSYM pSym; /* The symbol. */
1977	unsigned uHash = 0; /* The symbol name hash. */
1978	const char pszName; / The symbol name in the string pool */
1979	int cchNameWeak = 0; /* Indicator and length of the weak name. (0 if not weak) */
1980	/* general stuff */
1981	const char * pach;
1982
1983	if (peAction)
1984	*peAction = WLDSA_ERR;
1985	if (cchName < 0)
1986	cchName = strlen(pachName);
1987
1988	/* adjust namelength / check for weak name and trucation / hash name */
1989	pach = pachName + cchName - 2; /* "$w$" */
1990	while (pach-- > pachName)
1991	{
1992	if ( pach[0] == '$'
1993	&& pach[1] == 'w'
1994	&& pach[2] == '$')
1995	{
1996	cchNameWeak = cchName;
1997	cchName = pach - pachName;
1998	fFlags \|= WLDSF_WEAK;
1999	/* If WKEXT we'll upgrade it to weak undefined. (yeah, big deal?) */
2000	if ((fFlags & WLDSF_TYPEMASK) == WLDSF_WKEXT)
2001	fFlags = (fFlags & ~WLDSF_TYPEMASK) \| WLDSF_UNDEF;
2002
2003	if (cchName <= 200)
2004	break;
2005	}
2006	}
2007	pszName = (pWld->fFlags & WLDC_CASE_INSENSITIVE ? strpool_addnu : strpool_addn)(pWld->pStrMisc, pachName, cchName);
2008	uHash = symHash(pszName, cchName, pWld->fFlags & WLDC_CASE_INSENSITIVE);
2009
2010	/* search for existing symbol */
2011	for (pSym = pWld->Global.ap[uHash % WLDSYM_HASH_SIZE]; pSym; pSym = pSym->pHashNext)
2012	if (SYM_EQUAL(pWld, pSym, pszName, fFlags, uHash, cchName))
2013	break;
2014
2015	if (!pSym)
2016	{
2017	/*
2018	* new symbol - this is easy!
2019	*/
2020	pSym = xmalloc(sizeof(*pSym));
2021	memset(pSym, 0, sizeof(*pSym));
2022	pSym->fFlags = fFlags;
2023	pSym->pszName = pszName;
2024	pSym->uHash = uHash;
2025	if (cchNameWeak)
2026	{
2027	pSym->pszWeakName = strpool_addn(pWld->pStrMisc, pachName, cchNameWeak);
2028	pSym->fFlags \|= WLDSF_WEAK;
2029	WLDINFO(pWld, ("Weak symbol '%s'.", pSym->pszWeakName));
2030	}
2031	pSym->pHashNext = pWld->Global.ap[uHash % WLDSYM_HASH_SIZE];
2032	pWld->Global.ap[uHash % WLDSYM_HASH_SIZE] = pSym;
2033	if (peAction) *peAction = WLDSA_NEW;
2034	WLDDBG2(("symAdd: New symbol '%s'", pSym->pszName));
2035	}
2036	else
2037	{ /* found existing symbol - more complex... */
2038
2039	/*
2040	* We'll simply return existing symbol when:
2041	* 1. adding a UNDEF where a PUBLIC, COMM, !WEAK UNDEF or IMPORT exists.
2042	* 2. adding a WKEXT where a PUBLIC or COMM exists.
2043	* 3. adding a WKEXT where a UNDEF which isn't UNCERTAIN exists.
2044	* 4. adding a COMM where a !WEAK COMM or PUBLIC exists.
2045	* 5. adding a WEAK PUBLIC or WEAK COMM where a PUBLIC or COMM exists.
2046	* 6. adding a WEAK UNDEF where WEAK UNDEF exists.
2047	*/
2048	if ( ( /* 1 */
2049	(fFlags & WLDSF_TYPEMASK) == WLDSF_UNDEF
2050	&& ((pSym->fFlags & WLDSF_TYPEMASK) == WLDSF_PUBLIC \|\| (pSym->fFlags & WLDSF_TYPEMASK) == WLDSF_COMM
2051	\|\| (pSym->fFlags & (WLDSF_TYPEMASK \| WLDSF_WEAK)) == WLDSF_UNDEF \|\| (pSym->fFlags & (WLDSF_TYPEMASK)) == WLDSF_IMPORT)
2052	) \|\| ( /* 2 */
2053	(fFlags & WLDSF_TYPEMASK) == WLDSF_WKEXT
2054	&& ((pSym->fFlags & WLDSF_TYPEMASK) == WLDSF_PUBLIC \|\| (pSym->fFlags & WLDSF_TYPEMASK) == WLDSF_COMM)
2055	) \|\| ( /* 3 */
2056	(fFlags & WLDSF_TYPEMASK) == WLDSF_WKEXT
2057	&& (pSym->fFlags & (WLDSF_TYPEMASK \| WLDSF_UNCERTAIN)) == WLDSF_UNDEF
2058	) \|\| ( /* 4 */
2059	(fFlags & WLDSF_TYPEMASK) == WLDSF_COMM
2060	&& ((pSym->fFlags & (WLDSF_TYPEMASK \| WLDSF_WEAK)) == WLDSF_COMM \|\| (pSym->fFlags & WLDSF_TYPEMASK) == WLDSF_PUBLIC)
2061	) \|\| ( /* 5 */
2062	((fFlags & (WLDSF_TYPEMASK \| WLDSF_WEAK)) == (WLDSF_PUBLIC \| WLDSF_WEAK) \|\| (fFlags & (WLDSF_TYPEMASK \| WLDSF_WEAK)) == (WLDSF_COMM \| WLDSF_WEAK))
2063	&& ((pSym->fFlags & WLDSF_TYPEMASK) == WLDSF_PUBLIC \|\| (pSym->fFlags & WLDSF_TYPEMASK) == WLDSF_COMM)
2064	) \|\| ( /* 6 */
2065	((fFlags & (WLDSF_TYPEMASK \| WLDSF_WEAK)) == (WLDSF_UNDEF \| WLDSF_WEAK))
2066	&& ((pSym->fFlags & (WLDSF_TYPEMASK \| WLDSF_WEAK)) == (WLDSF_UNDEF \| WLDSF_WEAK))
2067	))
2068	{
2069	if (peAction) *peAction = WLDSA_OLD;
2070	WLDDBG2(("symAdd: Old symbol '%s'", pSym->pszName));
2071	}
2072	/*
2073	* We'll warn and return existing symbol when:
2074	* 1. adding a IMPORT LIBSEARCH where a PUBLIC or COMM exists.
2075	*/
2076	else
2077	if ( (fFlags & (WLDSF_TYPEMASK \| WLDSF_LIBSEARCH)) == (WLDSF_IMPORT \| WLDSF_LIBSEARCH)
2078	&& ((pSym->fFlags & WLDSF_TYPEMASK) == WLDSF_PUBLIC \|\| (pSym->fFlags & WLDSF_TYPEMASK) == WLDSF_COMM)
2079	)
2080	{
2081	modWarn(pMod, "Ignoring import '%s' as it's defined already.", pszName);
2082	if (peAction) *peAction = WLDSA_OLD;
2083	WLDDBG2(("symAdd: Old symbol '%s'", pSym->pszName));
2084	}
2085	/*
2086	* We'll return upgraded existing symbol when:
2087	* 1. adding a PUBLIC, COMM or IMPORT where a UNDEF or WKEXT exists.
2088	* 2. adding a !WEAK PUBLIC or !WEAK COMM where a WEAK PUBLIC or WEAK COMM exists.
2089	* 3. adding a !WEAK UNDEF where a WEAK UNDEF exists.
2090	* 4. adding a UNDEF where a WKEXT exists.
2091	* 5. adding a IMPORT where a WEAK exists.
2092	* 6. adding a PUBLIC where a COMM exists.
2093	*/
2094	else
2095	if ( ( /* 1 */
2096	((fFlags & WLDSF_TYPEMASK) == WLDSF_PUBLIC \|\| (fFlags & WLDSF_TYPEMASK) == WLDSF_COMM \|\| (fFlags & WLDSF_TYPEMASK) == WLDSF_IMPORT)
2097	&& ((pSym->fFlags & WLDSF_TYPEMASK) == WLDSF_WKEXT \|\| (pSym->fFlags & WLDSF_TYPEMASK) == WLDSF_UNDEF)
2098	) \|\| ( /* 2 */
2099	((fFlags & (WLDSF_TYPEMASK \| WLDSF_WEAK)) == WLDSF_PUBLIC \|\| (fFlags & (WLDSF_TYPEMASK \| WLDSF_WEAK)) == WLDSF_COMM)
2100	&& ((pSym->fFlags & (WLDSF_TYPEMASK \| WLDSF_WEAK)) == (WLDSF_PUBLIC \| WLDSF_WEAK) \|\| (pSym->fFlags & (WLDSF_TYPEMASK \| WLDSF_WEAK)) == (WLDSF_COMM \| WLDSF_WEAK))
2101	) \|\| ( /* 3 */
2102	(fFlags & (WLDSF_TYPEMASK \| WLDSF_WEAK)) == WLDSF_UNDEF
2103	&& (pSym->fFlags & (WLDSF_TYPEMASK \| WLDSF_WEAK)) == (WLDSF_UNDEF \| WLDSF_WEAK)
2104	) \|\| ( /* 4 */
2105	(fFlags & WLDSF_TYPEMASK) == WLDSF_UNDEF
2106	&& (pSym->fFlags & WLDSF_TYPEMASK) == WLDSF_WKEXT
2107	) \|\| ( /* 5 */
2108	(fFlags & WLDSF_TYPEMASK) == WLDSF_IMPORT
2109	&& (pSym->fFlags & WLDSF_WEAK) == WLDSF_WEAK
2110	) \|\| ( /* 6 */
2111	(fFlags & WLDSF_TYPEMASK) == WLDSF_PUBLIC
2112	&& (pSym->fFlags & WLDSF_TYPEMASK) == WLDSF_COMM
2113	))
2114	{
2115	if (!(pSym->fFlags & WLDSF_WEAK) && (fFlags & WLDSF_WEAK) && cchNameWeak)
2116	{ /* the symbol is upgraded to a weak one - there probably won't be a name though. */
2117	pSym->pszWeakName = strpool_addn(pWld->pStrMisc, pachName, cchNameWeak);
2118	}
2119	if ((fFlags & WLDSF_TYPEMASK) == WLDSF_PUBLIC && (pSym->fFlags & WLDSF_TYPEMASK) == WLDSF_COMM)
2120	memset(&pSym->u, 0, sizeof(pSym->u));
2121	pSym->fFlags = (pSym->fFlags & ~(WLDSF_TYPEMASK \| WLDSF_WEAK \| WLDSF_UNCERTAIN \| WLDSF_LIBSEARCH)) \| fFlags;
2122	if (peAction) *peAction = WLDSA_UP;
2123	WLDDBG2(("symAdd: Upgraded symbol '%s'", pSym->pszName));
2124	}
2125	/*
2126	* We'll warn and upgraded existing symbol when:
2127	* 1. adding a PUBLIC or COMM where a IMPORT LIBSEARCH exists.
2128	*/
2129	else
2130	if ( ((fFlags & WLDSF_TYPEMASK) == WLDSF_PUBLIC \|\| (fFlags & WLDSF_TYPEMASK) == WLDSF_COMM)
2131	&& (pSym->fFlags & (WLDSF_TYPEMASK \| WLDSF_LIBSEARCH)) == (WLDSF_IMPORT \| WLDSF_LIBSEARCH)
2132	)
2133	{
2134	modWarn(pMod, "Ignoring imported symbol '%s' as it's being defined here.", pszName);
2135
2136	if (!(pSym->fFlags & WLDSF_WEAK) && (fFlags & WLDSF_WEAK) && cchNameWeak)
2137	{ /* the symbol is upgraded to a weak one - there probably won't be a name though. */
2138	pSym->pszWeakName = strpool_addn(pWld->pStrMisc, pachName, cchNameWeak);
2139	}
2140	pSym->fFlags = (pSym->fFlags & ~(WLDSF_TYPEMASK \| WLDSF_WEAK \| WLDSF_UNCERTAIN \| WLDSF_LIBSEARCH)) \| fFlags;
2141	if (peAction) *peAction = WLDSA_UP;
2142	memset(&pSym->u, 0, sizeof(pSym->u));
2143	WLDDBG2(("symAdd: Upgraded symbol '%s'", pSym->pszName));
2144	}
2145	/*
2146	* That's all, now it's just error left.
2147	*
2148	* (Afraid we might end up here without wanting to a few times before
2149	* squashing all the bugs in the algorithm.)
2150	*/
2151	else
2152	{
2153	modErr(pMod, "Duplicate symbol '%s' ('%s').", pszName, pSym->pszName);
2154	if (pSym->pMod)
2155	modErr(pSym->pMod, "Symbol previosly defined in this module.");
2156	wldInfo("fFlags new 0x%04x fFlags old 0x%04x (%s).", fFlags, pSym->fFlags, symGetDescr(pSym));
2157	symDumpReferers(pSym);
2158	pSym = NULL;
2159	}
2160	}
2161
2162	/*
2163	* Maintain the module pointer, referers and truncation aliases.
2164	*/
2165	if (pSym)
2166	{
2167	if (SYM_IS_DEFINED(pSym->fFlags))
2168	pSym->pMod = pMod;
2169	else
2170	{
2171	int i;
2172	for (i = 0; i < pSym->cReferers; i++)
2173	if (pSym->paReferers[i] == pMod)
2174	break;
2175	if (i >= pSym->cReferers)
2176	{
2177	if (!(pSym->cReferers % 64))
2178	pSym->paReferers = xrealloc(pSym->paReferers, sizeof(pSym->paReferers[0]) * (pSym->cReferers + 64));
2179	pSym->paReferers[pSym->cReferers++] = pMod;
2180	}
2181	}
2182	}
2183
2184	return pSym;
2185	}
2186
2187
2188
2189	/**
2190	* Adds an import symbol to the linking.
2191	*
2192	* @returns see symAdd()
2193	* @param pWld Pointer to linker instance.
2194	* @param pMod Pointer to module
2195	* @param fLibSearch Set if we're doing library search at this time.
2196	* @param pachName The name which can be referenced in this module.
2197	* @param cchName Length of that name. -1 if zero terminated string.
2198	* @param pachImpName Internal name, the name used to import the symbol.
2199	* @param cchImpName Length of that name. -1 if zero terminated string.
2200	* @param pachModName Module name where the export should be resolved on load time.
2201	* @param cchModName Length of that name. -1 if zero terminated string.
2202	* @param uOrdinal The ordinal it's exported with from the module.
2203	* 0 if exported by the name pachImpName represent.
2204	*/
2205	PWLDSYM symAddImport(PWLD pWld, PWLDMOD pMod, int fLibSearch,
2206	const char *pachName, int cchName,
2207	const char *pachImpName, int cchImpName,
2208	const char *pachModName, int cchModName,
2209	unsigned uOrdinal)
2210	{
2211	WLDSYMACTION eAction;
2212	PWLDSYM pSym;
2213	const char * pszImpName;
2214	const char * pszImpMod;
2215
2216	pSym = symAdd(pWld, pMod, WLDSF_IMPORT \| (fLibSearch ? WLDSF_LIBSEARCH : 0),
2217	pachName, cchName, &eAction);
2218	if (!pSym)
2219	return NULL;
2220
2221	/* Add the strings we'll need them very soon */
2222	if (cchModName > 0)
2223	pszImpMod = strpool_addnu(pWld->pStrMisc, pachModName, cchModName);
2224	else
2225	pszImpMod = strpool_addu(pWld->pStrMisc, pachModName);
2226	pszImpName = NULL;
2227	if (!uOrdinal)
2228	{
2229	/* If no imp name, we'll use the name we know it as. */
2230	if (!pachImpName \|\| cchImpName == 0 \|\| !*pachImpName)
2231	{
2232	pachImpName = pachName;
2233	cchImpName = cchName;
2234	}
2235	if (cchImpName > 0)
2236	pszImpName = strpool_addn(pWld->pStrMisc, pachImpName, cchImpName);
2237	else
2238	pszImpName = strpool_add(pWld->pStrMisc, pachImpName);
2239	}
2240
2241	/* Process the symbol */
2242	switch (eAction)
2243	{
2244	case WLDSA_NEW:
2245	case WLDSA_UP:
2246	pSym->u.import.pszImpMod = pszImpMod;
2247	pSym->u.import.pszImpName = pszImpName;
2248	pSym->u.import.uImpOrd = uOrdinal;
2249	break;
2250
2251	case WLDSA_OLD:
2252	{ /* verify that the name matches */
2253	if ((pSym->fFlags & WLDSF_TYPEMASK) == WLDSF_IMPORT)
2254	{
2255	if (!pSym->u.import.pszImpMod)
2256	{
2257	pSym->u.import.pszImpMod = pszImpMod;
2258	pSym->u.import.pszImpName = pszImpName;
2259	pSym->u.import.uImpOrd = uOrdinal;
2260	}
2261	else
2262	{
2263	if ( pSym->u.import.pszImpMod != pszImpMod
2264	&& pSym->u.import.pszImpName != pszImpName
2265	&& pSym->u.import.uImpOrd != uOrdinal)
2266	{
2267	modWarn(pMod, "Existing import '%s' have different module name than the new ('%s' != '%s'), different ordinal (%d != %d), and different name (%s != %s).",
2268	pSym->pszName, pSym->u.import.pszImpMod, pszImpMod, pSym->u.import.uImpOrd, uOrdinal, pSym->u.import.pszImpName, pszImpName);
2269	}
2270	else if (pSym->u.import.pszImpMod != pszImpMod)
2271	{
2272	modWarn(pMod, "Existing import '%s' have different module name than the new ('%s' != '%s').",
2273	pSym->pszName, pSym->u.import.pszImpMod, pszImpMod);
2274	}
2275	else if (pSym->u.import.pszImpName != pszImpName)
2276	{
2277	modWarn(pMod, "Existing import '%s' have different import name (%s != %s).",
2278	pSym->pszName, pSym->u.import.pszImpName, pszImpName);
2279	}
2280	else if (pSym->u.import.uImpOrd != uOrdinal)
2281	{
2282	modWarn(pMod, "Existing import '%s' have different ordinal (%d != %d).",
2283	pSym->pszName, pSym->u.import.uImpOrd, uOrdinal);
2284	}
2285	}
2286	}
2287	/* else: no need to complain, symAdd already did that. */
2288	break;
2289	}
2290
2291	default:
2292	WLDINTERR(pWld, pMod);
2293	}
2294
2295	return pSym;
2296	}
2297
2298
2299	/**
2300	* Adds(/Marks) an exported symbol.
2301	*
2302	* @returns see symAdd()
2303	* @param pWld Pointer to linker instance.
2304	* @param pMod Pointer to module
2305	* @param fLibSearch Set if we're doing library search at this time.
2306	* @param fExport Export flags (WLDSEF_*).
2307	* @param cExpWords Number of words to push on the stack if this
2308	* export is a call gate.
2309	* @param pachExpName Exported name.
2310	* @param cchExpName Length of that name. -1 if zero terminated string.
2311	* @param pachIntName Internal name. NULL or with cchIntName == 0 if the same
2312	* as the exported one.
2313	* @param cchIntName Length of that name. -1 if zero terminated string.
2314	* 0 if the internal name is the same and the exported one.
2315	* @param uOrdinal The ordinal it's exported with
2316	* 0 if exported by the name pachIntName represent.
2317	*/
2318	static PWLDSYM symAddExport(PWLD pWld, PWLDMOD pMod, int fLibSearch,
2319	unsigned fExport,
2320	unsigned cExpWords,
2321	const char *pachExpName, int cchExpName,
2322	const char *pachIntName, int cchIntName,
2323	unsigned uOrdinal)
2324	{
2325	PWLDSYM pSym;
2326
2327	/* set default name */
2328	if (!pachIntName \|\| !cchIntName \|\| !*pachIntName)
2329	{
2330	pachIntName = pachExpName;
2331	cchIntName = cchExpName;
2332	}
2333
2334	/*
2335	* Add external name.
2336	*/
2337	pSym = symAdd(pWld, pMod, WLDSF_UNDEF \| (fLibSearch ? WLDSF_LIBSEARCH : 0),
2338	pachExpName, cchExpName, NULL);
2339	if (!pSym)
2340	return NULL;
2341
2342	/*
2343	* Is the exported symbol already exported?
2344	*/
2345	if (pSym->fFlags & WLDSF_EXPORT)
2346	{
2347	if ( (pSym->fExport & WLDSEF_DEF_FILE)
2348	&& (fExport & WLDSEF_DEF_FILE))
2349	modWarn(pMod, "Export '%s' is already defined.", pSym->pszName);
2350	if ( !(pSym->fExport & WLDSEF_DEF_FILE)
2351	&& (fExport & WLDSEF_DEF_FILE))
2352	pSym->fExport = fExport;
2353	}
2354	else
2355	{
2356	PWLDSYM pSymAlias;
2357
2358	pSym->fFlags \|= WLDSF_EXPORT;
2359
2360	/*
2361	* Add internal name.
2362	*/
2363	pSymAlias = symAdd(pWld, pMod, WLDSF_UNDEF \| (fLibSearch ? WLDSF_LIBSEARCH : 0),
2364	pachIntName, cchIntName, NULL);
2365	if (!pSymAlias)
2366	return NULL;
2367	if (pSymAlias != pSym && (pSym->fFlags & WLDSF_ALIAS) && pSym->pAliasFor != pSymAlias)
2368	{
2369	modErr(pMod, "Can't export an alias!.");
2370	pSym = NULL;
2371	}
2372	else
2373	{
2374	if (pSym != pSymAlias)
2375	{
2376	pSym->fFlags \|= WLDSF_ALIAS;
2377	pSym->fFlags &= ~WLDSF_UNDEF;
2378	pSym->pAliasFor = pSymAlias;
2379	}
2380	pSym->fExport = fExport;
2381	pSym->cExpWords = cExpWords;
2382	pSym->uExpOrd = uOrdinal;
2383	}
2384	}
2385
2386	return pSym;
2387	}
2388
2389
2390	/**
2391	* Adds a public symbol.
2392	*
2393	* @returns see symAdd()
2394	* @param pWld Pointer to linker instance.
2395	* @param pMod Pointer to module
2396	* @param fLibSearch Set if we're doing library search at this time.
2397	* @param pachName Exported name.
2398	* @param cchName Length of that name. -1 if zero terminated string.
2399	* @param ulValue Value of the symbol.
2400	* @param iSegment Segment of pMod in which this symbol is defined.
2401	* Use -1 if segment is not relevant.
2402	*/
2403	static PWLDSYM symAddPublic(PWLD pWld, PWLDMOD pMod, int fLibSearch,
2404	const char *pachName, int cchName,
2405	unsigned long ulValue, int iSegment, int iGroup)
2406	{
2407	PWLDSYM pSym;
2408
2409	pSym = symAdd(pWld, pMod, WLDSF_PUBLIC \| (fLibSearch ? WLDSF_LIBSEARCH : 0),
2410	pachName, cchName, NULL);
2411	if (!pSym)
2412	return NULL;
2413	/* @todo: handle values ulValue, iSegment and iGroup? Not really required for this job... */
2414	return pSym;
2415	}
2416
2417
2418	/**
2419	* Adds an undefined symbol.
2420	*
2421	* @returns see symAdd()
2422	* @param pWld Pointer to linker instance.
2423	* @param pMod Pointer to module
2424	* @param fLibSearch Set if we're doing library search at this time.
2425	* @param pachName Exported name.
2426	* @param cchName Length of that name. -1 if zero terminated string.
2427	*/
2428	static PWLDSYM symAddUnDef(PWLD pWld, PWLDMOD pMod, int fLibSearch,
2429	const char *pachName, int cchName)
2430	{
2431	PWLDSYM pSym;
2432
2433	pSym = symAdd(pWld, pMod, WLDSF_UNDEF \| WLDSF_UNCERTAIN \| (fLibSearch ? WLDSF_LIBSEARCH : 0),
2434	pachName, cchName, NULL);
2435	if (!pSym)
2436	return NULL;
2437	return pSym;
2438	}
2439
2440
2441	/**
2442	* Adds an undefined symbol.
2443	*
2444	* @returns see symAdd()
2445	* @param pWld Pointer to linker instance.
2446	* @param pMod Pointer to module
2447	* @param fLibSearch Set if we're doing library search at this time.
2448	* @param pachName Exported name.
2449	* @param cchName Length of that name. -1 if zero terminated string.
2450	*/
2451	static PWLDSYM symAddAlias(PWLD pWld, PWLDMOD pMod, int fLibSearch,
2452	const char *pachAliasName, int cchAliasName,
2453	const char *pachName, int cchName
2454	)
2455	{
2456	WLDSYMACTION eAction;
2457	PWLDSYM pSym;
2458
2459	/*
2460	* Start by adding the alias it self.
2461	*/
2462	pSym = symAdd(pWld, pMod, WLDSF_PUBLIC \| WLDSF_ALIAS \| (fLibSearch ? WLDSF_LIBSEARCH : 0),
2463	pachAliasName, cchAliasName, &eAction);
2464	if (!pSym)
2465	return NULL;
2466	switch (eAction)
2467	{
2468	case WLDSA_NEW:
2469	case WLDSA_UP:
2470	{
2471	if (!pSym->pAliasFor)
2472	{
2473	PWLDSYM pSym2 = symAdd(pWld, pMod, WLDSF_UNDEF \| (fLibSearch ? WLDSF_LIBSEARCH : 0),
2474	pachName, cchName, NULL);
2475	if (!pSym2)
2476	return NULL;
2477	pSym->pAliasFor = pSym2;
2478	}
2479	else
2480	{
2481	modErr(pMod, "Aliased symbol apparently existed already (upgraded - internal error?).");
2482	symDbg(pSym, "Processing");
2483	symDbg(pSym->pAliasFor, "Alias");
2484	pSym = NULL;
2485	}
2486	break;
2487	}
2488
2489	case WLDSA_OLD:
2490	modErr(pMod, "Aliased symbol already exists.");
2491	pSym = NULL;
2492	break;
2493	default:
2494	WLDINTERR(pWld, pMod);
2495	}
2496
2497	return pSym;
2498	}
2499
2500
2501	/**
2502	* Adds(/Marks) an communal symbol.
2503	*
2504	* @returns see symAdd()
2505	* @param pWld Pointer to linker instance.
2506	* @param pMod Pointer to module
2507	* @param fLibSearch Set if we're doing library search at this time.
2508	* @param fDataType Datatype.
2509	* @param cElements Number of elements.
2510	* @param cbElement Size of one element.
2511	* @param pachName Symbol name.
2512	* @param cchName Length of the name. -1 if zero terminated string.
2513	*/
2514	static PWLDSYM symAddComdef(PWLD pWld, PWLDMOD pMod, int fLibSearch,
2515	const char *pachName, int cchName,
2516	signed long cElements, signed long cbElement)
2517	{
2518	PWLDSYM pSym;
2519	WLDSYMACTION eAction;
2520
2521	/*
2522	* Add external name.
2523	*/
2524	pSym = symAdd(pWld, pMod, WLDSF_COMM \| (fLibSearch ? WLDSF_LIBSEARCH : 0),
2525	pachName, cchName, &eAction);
2526	if (!pSym)
2527	return NULL;
2528
2529	cbElement = (cElements > 0 ? cElements : 1); / make it a size */
2530	switch (eAction)
2531	{
2532	case WLDSA_NEW:
2533	pSym->u.comm.cb = cbElement * (cElements > 0 ? cElements : 1);
2534	pSym->u.comm.cElements = cElements;
2535	break;
2536
2537	case WLDSA_UP:
2538	if ((pSym->fFlags & (WLDSF_TYPEMASK)) != WLDSF_COMM)
2539	break;
2540	/* fallthru */
2541	case WLDSA_OLD:
2542	/* merge size */
2543	if (pSym->u.comm.cElements < cElements)
2544	pSym->u.comm.cElements = cElements;
2545	if (pSym->u.comm.cb < cbElement)
2546	pSym->u.comm.cb = cbElement;
2547	break;
2548
2549	default:
2550	WLDINTERR(pWld, pMod);
2551	}
2552
2553	return pSym;
2554	}
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566	/*=============================================================================
2567	* *
2568	* *
2569	* M I S C M E T H O D S *
2570	* M I S C M E T H O D S *
2571	* M I S C M E T H O D S *
2572	* M I S C M E T H O D S *
2573	* M I S C M E T H O D S *
2574	* *
2575	* *
2576	============================================================================/
2577
2578
2579	/**
2580	* Reads an OMF module from a file.
2581	*
2582	* This may be part of a library file so, we'll only read from THEADR to
2583	* past the first MODEND or the Pass 1 comment record.
2584	* The function will return the module stream positioned after the last
2585	* record it read.
2586	*
2587	* @returns 0 on success.
2588	* @returns non zero on failure.
2589	* @param pWld Pointer to linker instance.
2590	* @param pMod Pointer to module
2591	* @param fLibSearch Set if we're doing library search at this time.
2592	*/
2593	static unsigned pass1ReadOMFMod(PWLD pWld, PWLDMOD pMod, int fLibSearch)
2594	{
2595	OMFREC OmfRec = {0,0};
2596	FILE * phFile; /* Input file. */
2597	PWLDSYM * papExts = NULL; /* Pointer to an array of EXTDEFs (as they appear) */
2598	/* We need them for the WKEXT processing. */
2599	int cExts = 0; /* Number of Entries in papExts. */
2600	int fFirst = 1; /* First record indicator. */
2601	/* generic stuff we'll use alot with not status associated. */
2602	PWLDSYM pSym;
2603	int i;
2604	unsigned long ul;
2605	signed long l2, l3;
2606	unsigned short us, us2, us3;
2607	unsigned char uch, uch2;
2608
2609	/* We're counting indexes from 1, so add dummy zero entry. */
2610	papExts = xmalloc(sizeof(papExts[0])*64);
2611	papExts[0] = NULL;
2612	cExts = 1;
2613
2614
2615	/* open and position the file. */
2616	phFile = modOpen(pMod);
2617
2618	/* loop till we get a MODEND */
2619	for (;;)
2620	{
2621	unsigned char achBuffer[OMF_MAX_REC + 8];
2622	union
2623	{
2624	unsigned char * puch;
2625	signed char * pch;
2626	unsigned short * pus;
2627	signed short * ps;
2628	unsigned long * pul;
2629	signed long * pl;
2630	void * pv;
2631	} u, u1, u2, u3;
2632
2633	/** macro for getting a OMF index out of the buffer */
2634	#define OMF_GETINDEX() (u.puch & 0x80 ? ((u.pch++ & 0x7f) << 8) + u.pch++ : u.pch++)
2635	#define OMF_BYTE() (*u.puch++)
2636	#define OMF_WORD() (*u.pus++)
2637	#define OMF_24BITWORD() (OMF_BYTE() \| (OMF_WORD() << 8))
2638	#define OMF_DWORD() (*u.pul++)
2639	#define OMF_MORE() (u.puch - &achBuffer[0] < (int)OmfRec.cb - 1)
2640	#define OMF_IS32BIT() ((OmfRec.chType & REC32) != 0)
2641	#define OMF_GETTYPELEN(l) \
2642	do \
2643	{ \
2644	l = OMF_BYTE(); \
2645	if (l > 128) \
2646	switch (l) \
2647	{ \
2648	case 0x81: l = OMF_WORD(); break; \
2649	case 0x84: l = OMF_24BITWORD(); break; \
2650	case 0x88: l = OMF_DWORD(); break; \
2651	default: \
2652	modErr(pMod, "Invalid type length!"); \
2653	goto failure; \
2654	} \
2655	} while (0)
2656
2657	u.pv = &achBuffer[0];
2658
2659	/* read omf record header */
2660	if (fread(&OmfRec, sizeof(OmfRec), 1, phFile) != 1)
2661	{
2662	modErr(pMod, "read error. (offset ~= %#x).", (int)ftell(phFile));
2663	goto failure;
2664	}
2665	if (fFirst)
2666	{ /* some extra check for the first record. */
2667	fFirst = 0;
2668	if (OmfRec.chType != THEADR)
2669	{
2670	modErr(pMod, "invalid object module (offset %#x).", (int)pMod->off);
2671	goto failure;
2672	}
2673	}
2674
2675	/* Read or skip the record. */
2676	switch (OmfRec.chType)
2677	{
2678	/* done */
2679	case MODEND: case MODEND \| REC32:
2680	case LIBEND:
2681	fseek(phFile, OmfRec.cb, SEEK_CUR);
2682	goto done_skip;
2683	/* read */
2684	case EXTDEF: case EXTDEF \| REC32:
2685	case PUBDEF: case PUBDEF \| REC32:
2686	case ALIAS: case ALIAS \| REC32:
2687	case COMDEF: case COMDEF \| REC32:
2688	case COMDAT: case COMDAT \| REC32:
2689	case COMENT: case COMENT \| REC32:
2690	case THEADR: case THEADR \| REC32:
2691	case LIBHDR:
2692	break;
2693	/* skip */
2694	default:
2695	fseek(phFile, OmfRec.cb, SEEK_CUR);
2696	continue;
2697	}
2698	if (fread(achBuffer, OmfRec.cb, 1, phFile) != 1)
2699	{
2700	modErr(pMod, "read error. (offset ~= %#x)", ftell(phFile));
2701	goto failure;
2702	}
2703
2704	/* Switch on type. */
2705	switch (OmfRec.chType)
2706	{
2707	case THEADR:
2708	{
2709	if (!pMod->pszModName)
2710	pMod->pszModName = strpool_addn(pWld->pStrMisc, u.pch + 1, *u.puch);
2711	/* Put out some /INFO stuff similar to ilink. */
2712	if (pMod->pLib)
2713	WLDINFO(pWld, ("Reading @0x%08x %s(%s)", (int)pMod->off, pMod->pLib->pszLibName, pMod->pszModName));
2714	else
2715	WLDINFO(pWld, ("Reading @0x%08x %s", (int)pMod->off, pMod->pszModName));
2716	break;
2717	}
2718
2719	case COMENT: case COMENT \| REC32:
2720	uch = OMF_BYTE(); /* comment type */
2721	uch = OMF_BYTE(); /* comment class */
2722	switch (uch)
2723	{
2724	case CLASS_PASS:
2725	goto done_noskip;
2726	case CLASS_WKEXT:
2727	{ /* This is a bit tricky, we need to have an indexable array
2728	* of the extdefs for this module. In addition we'll need to
2729	* make sure we don't mark an EXTDEF from another module as
2730	* weak.
2731	*/
2732	while (OMF_MORE())
2733	{
2734	int iWeak = OMF_GETINDEX();
2735	int iDefault = OMF_GETINDEX();
2736	if ( iWeak >= cExts
2737	\|\| iDefault >= cExts
2738	\|\| !papExts[iWeak]
2739	\|\| !papExts[iDefault])
2740	{
2741	modErr(pMod, "Invalid WKEXT record.");
2742	goto failure;
2743	}
2744	if ((papExts[iWeak]->fFlags & (WLDSF_TYPEMASK \| WLDSF_UNCERTAIN)) == (WLDSF_UNDEF \| WLDSF_UNCERTAIN))
2745	{
2746	papExts[iWeak]->fFlags = (papExts[iWeak]->fFlags & ~(WLDSF_TYPEMASK \| WLDSF_UNCERTAIN)) \| WLDSF_WKEXT;
2747	papExts[iWeak]->pWeakDefault = papExts[iDefault];
2748	SYMDBG(papExts[iWeak], "WKEXT");
2749	}
2750	else if ( (papExts[iWeak]->fFlags & WLDSF_TYPEMASK) == WLDSF_WKEXT
2751	&& papExts[iWeak]->pWeakDefault != papExts[iDefault])
2752	modWarn(pMod, "WKEXT '%s' already declared with '%s' and not '%s' as default.",
2753	papExts[iWeak]->pszName, papExts[iWeak]->pWeakDefault->pszName, papExts[iDefault]->pszName);
2754	}
2755	break;
2756	}
2757
2758	case CLASS_OMFEXT:
2759	{
2760	switch (OMF_BYTE())
2761	{ /*
2762	* Import definition.
2763	*/
2764	case OMFEXT_IMPDEF:
2765	{
2766	uch = OMF_BYTE(); /* flags */
2767	u1 = u; u.pch += 1 + u.puch; / internal name */
2768	u2 = u; u.pch += 1 + u.puch; / module name */
2769	ul = 0; /* ordinal */
2770	if (uch & 1)
2771	ul = OMF_WORD();
2772
2773	pSym = symAddImport(pWld, pMod, fLibSearch,
2774	u1.pch + 1, *u1.puch,
2775	u1.pch + 1, *u1.puch,
2776	u2.pch + 1, *u2.puch,
2777	ul);
2778	if (!pSym) goto failure;
2779	SYMDBG(pSym, "IMPDEF");
2780	break;
2781	}
2782
2783	/*
2784	* Export definition.
2785	* If it have an internal name the exported name will become
2786	* an alias record.
2787	*/
2788	case OMFEXT_EXPDEF:
2789	{
2790	u1 = u; u.pch++; /* flags */
2791	u2 = u; u.pch += 1 + u.puch; / exported name */
2792	u3 = u; u.pch += 1 + u.puch; / internal name */
2793	ul = 0; /* ordinal */
2794	if (*u1.pch & 0x80)
2795	ul = OMF_WORD();
2796	pSym = symAddExport(pWld, pMod, fLibSearch,
2797	(u1.puch & 0x40 ? WLDSEF_RESIDENT : WLDSEF_DEFAULT) \| (u1.puch & 0x20 ? WLDSEF_NODATA : 0),
2798	((unsigned)*u1.puch) & 0x1f,
2799	u2.pch + 1, *u2.puch,
2800	u3.pch + 1, *u3.puch,
2801	ul);
2802	if (!pSym) goto failure;
2803	SYMDBG(pSym, "EXPDEF");
2804	break;
2805	}
2806	}
2807	}
2808	} /* comment class */
2809	break;
2810
2811	case EXTDEF:
2812	{
2813	while (OMF_MORE())
2814	{
2815	u1 = u; u.pch += 1 + *u.puch;
2816	ul = OMF_GETINDEX(); /* typeindex */
2817	pSym = symAddUnDef(pWld, pMod, fLibSearch, u1.puch + 1, *u1.puch);
2818	if (!pSym) goto failure;
2819	SYMDBG(pSym, "EXTDEF");
2820	/* put into array of externals */
2821	if (!(cExts % 64))
2822	papExts = xrealloc(papExts, sizeof(papExts[0]) * (cExts + 64));
2823	papExts[cExts++] = pSym;
2824	}
2825	break;
2826	}
2827
2828	case PUBDEF: case PUBDEF \| REC32:
2829	{
2830	us2 = OMF_GETINDEX(); /* group index */
2831	us3 = OMF_GETINDEX(); /* segment index */
2832	if (!us3)
2833	us = OMF_WORD(); /* base frame - ignored */
2834	while (OMF_MORE())
2835	{
2836	u1 = u; u.pch += 1 + u.puch; / public name */
2837	ul = OMF_IS32BIT() ? OMF_DWORD() : OMF_WORD();
2838	us = OMF_GETINDEX(); /* typeindex */
2839	pSym = symAddPublic(pWld, pMod, fLibSearch, u1.puch + 1, *u1.puch,
2840	ul, us3, us2);
2841	if (!pSym) goto failure;
2842	SYMDBG(pSym, "PUBDEF");
2843	}
2844	break;
2845	}
2846
2847	case ALIAS: case ALIAS \| REC32:
2848	{
2849	while (OMF_MORE())
2850	{
2851	u1 = u; u.pch += 1 + u.puch; / alias name */
2852	u2 = u; u.pch += 1 + u.puch; / substitutt name. */
2853	pSym = symAddAlias(pWld, pMod, fLibSearch,
2854	u1.puch + 1, *u1.puch,
2855	u2.puch + 1, *u2.puch);
2856	if (!pSym) goto failure;
2857	SYMDBG(pSym, "ALIAS");
2858	}
2859	break;
2860	}
2861
2862	case COMDEF: case COMDEF \| REC32:
2863	{
2864	while (OMF_MORE())
2865	{
2866	u1 = u; u.pch += 1 + u.puch; / communal name (specs say 1-2 length...) */
2867	us2 = OMF_GETINDEX(); /* typeindex */
2868	uch2 = OMF_BYTE(); /* date type */
2869	switch (uch2)
2870	{
2871	case COMDEF_TYPEFAR:
2872	OMF_GETTYPELEN(l2); /* number of elements */
2873	OMF_GETTYPELEN(l3); /* element size */
2874	break;
2875	case COMDEF_TYPENEAR:
2876	l2 = 1; /* number of elements */
2877	OMF_GETTYPELEN(l3); /* element size */
2878	break;
2879	default:
2880	modErr(pMod, "Invalid COMDEF type %x.", (int)uch2);
2881	goto failure;
2882	}
2883
2884	pSym = symAddComdef(pWld, pMod, fLibSearch,
2885	u1.puch + 1, *u1.puch,
2886	l2, l3);
2887	if (!pSym) goto failure;
2888	SYMDBG(pSym, "ALIAS");
2889	}
2890	break;
2891	}
2892
2893	case COMDAT: case COMDAT \| REC32:
2894	{
2895	break;
2896	}
2897
2898	case LIBHDR:
2899	modErr(pMod, "invalid object module (LIBHDR).");
2900	goto failure;
2901	default:
2902	fprintf(stderr, "we shall not be here!!\n");
2903	asm ("int $3");
2904	break;
2905	}
2906
2907	#undef OMF_GETINDEX
2908	#undef OMF_BYTE
2909	#undef OMF_WORD
2910	#undef OMF_24BITWORD
2911	#undef OMF_DWORD
2912	#undef OMF_MORE
2913	#undef OMF_IS32BIT
2914	#undef OMF_GETTYPELEN
2915	}
2916
2917	done_skip:
2918	/* Skip to end of record */
2919	fseek(phFile, OmfRec.cb, SEEK_CUR);
2920
2921	done_noskip:
2922	/* Make all the EXTDEFs uncertain. */
2923	for (i = 0; i < cExts; i++)
2924	if (papExts[i])
2925	papExts[i]->fFlags &= ~WLDSF_UNCERTAIN;
2926
2927	/* Max extdefs values. */
2928	if (fLibSearch)
2929	{
2930	if (pWld->cMaxLibExts < cExts)
2931	pWld->cMaxLibExts = cExts;
2932	}
2933	else
2934	{
2935	if (pWld->cMaxObjExts < cExts)
2936	pWld->cMaxObjExts = cExts;
2937	}
2938
2939	return 0;
2940
2941	failure:
2942	if (papExts)
2943	free(papExts);
2944	return -1;
2945	}
2946
2947
2948	/**
2949	* Reads an ELF module from a file.
2950	*
2951	* @returns 0 on success.
2952	* @returns non zero on failure.
2953	* @param pWld Pointer to linker instance.
2954	* @param pMod Pointer to module
2955	* @param fLibSearch Set if we're doing library search at this time.
2956	*/
2957	static unsigned pass1ReadELFMod(PWLD pWld, PWLDMOD pMod, int fLibSearch)
2958	{
2959	/** @todo implement me. */
2960	return 0;
2961	}
2962
2963
2964
2965
2966
2967
2968
2969	/*=============================================================================
2970	* *
2971	* *
2972	* P U B L I C M E T H O D S *
2973	* P U B L I C M E T H O D S *
2974	* P U B L I C M E T H O D S *
2975	* P U B L I C M E T H O D S *
2976	* P U B L I C M E T H O D S *
2977	* *
2978	* *
2979	============================================================================/
2980
2981	/**
2982	* Creates an instance of the linker.
2983	*
2984	* @returns Pointer to linker instance.
2985	* @param fFlags Linker flags as defined by enum wld_create_flags.
2986	*/
2987	PWLD WLDCreate(unsigned fFlags)
2988	{
2989	PWLD pWld = xmalloc(sizeof(*pWld));
2990
2991	/* initiate it */
2992	memset(pWld, 0, sizeof(*pWld));
2993	pWld->fFlags = fFlags;
2994	pWld->pStrMisc = strpool_init();
2995	pWld->ppObjsAdd = &pWld->pObjs;
2996	pWld->ppLibsAdd = &pWld->pLibs;
2997
2998	/*
2999	* Add predefined symbols.
3000	*/
3001	if (!(fFlags & WLDC_LINKER_LINK386))
3002	{
3003	symAddPublic(pWld, NULL, 0, "_end", 4, 0, 0, 0);
3004	symAddPublic(pWld, NULL, 0, "_edata", 6, 0, 0, 0);
3005	}
3006
3007	/* done */
3008	if (fFlags & WLDC_VERBOSE)
3009	fprintf(stderr, "weakld: info: linker created\n");
3010	return pWld;
3011	}
3012
3013	/**
3014	* Destroys a linker cleaning up open files and memory.
3015	*
3016	* @returns 0 on success.
3017	* @returns some unexplainable randomly picked number on failure.
3018	* @param pWld Linker instance to destroy.
3019	*/
3020	int WLDDestroy(PWLD pWld)
3021	{
3022	PWLDMOD pObj;
3023	PWLDLIB pLib;
3024	unsigned uHash;
3025
3026	if (!pWld)
3027	return 0;
3028	if (pWld->fFlags & WLDC_VERBOSE)
3029	fprintf(stderr, "weakld: info: destroying linker instance\n");
3030
3031	/* free mods */
3032	for (pObj = pWld->pObjs; pObj;)
3033	{
3034	void *pv = pObj;
3035	modClose(pObj);
3036	pObj = pObj->pNext;
3037	free(pv);
3038	}
3039	for (pObj = pWld->pDef; pObj;)
3040	{
3041	void *pv = pObj;
3042	modClose(pObj);
3043	pObj = pObj->pNext;
3044	free(pv);
3045	}
3046
3047	/* free libs */
3048	for (pLib = pWld->pLibs; pLib;)
3049	{
3050	void *pv = pLib;
3051	libClose(pLib);
3052	pLib = pLib->pNext;
3053	free(pv);
3054	}
3055
3056	/* free symbols */
3057	for (uHash = 0; uHash < sizeof(pWld->Global.ap) / sizeof(pWld->Global.ap[0]); uHash++)
3058	{
3059	PWLDSYM pSym = pWld->Global.ap[uHash];
3060	while (pSym)
3061	{
3062	PWLDSYM pNext = pSym->pHashNext;
3063	if (pSym->paReferers)
3064	free(pSym->paReferers);
3065	free(pSym);
3066	pSym = pNext;
3067	}
3068	}
3069
3070	/* members and finally the instance structure. */
3071	strpool_free(pWld->pStrMisc);
3072
3073	free(pWld);
3074	return 0;
3075	}
3076
3077
3078	/**
3079	* Checks if the ELF header is valid.
3080	*
3081	* @returns 1 if it is, 0 if it isn't.
3082	* @param pEhdr The ELF header.
3083	* @param pszName The file name to use when reporting errors.
3084	*/
3085	static int wldIsValidElfHdr(Elf32_Ehdr const pEhdr, const char pszName)
3086	{
3087	if (!IS_ELF(*pEhdr))
3088	fprintf(stderr, "weakld: '%s': not ELF file..\n", pszName);
3089	else if ( pEhdr->e_ident[EI_CLASS] != ELFCLASS32
3090	&& pEhdr->e_ident[EI_CLASS] != ELFCLASSNONE)
3091	fprintf(stderr, "weakld: '%s': wrong ELF class.\n", pszName);
3092	else if ( pEhdr->e_ident[EI_DATA] != ELFDATA2LSB
3093	&& pEhdr->e_ident[EI_DATA] != ELFDATANONE)
3094	fprintf(stderr, "weakld: '%s': wrong ELF endian.\n", pszName);
3095	else if (pEhdr->e_ident[EI_VERSION] != EV_CURRENT)
3096	fprintf(stderr, "weakld: '%s': wrong ELF version.\n", pszName);
3097	/* Ignore EI_OSABI, EI_ABIVERSION and EI_PAD. */
3098	else if (pEhdr->e_type != ET_REL)
3099	fprintf(stderr, "weakld: '%s': not relocatable ELF file.\n", pszName);
3100	else if ( pEhdr->e_machine != EM_386
3101	&& pEhdr->e_machine != EM_486)
3102	fprintf(stderr, "weakld: '%s': not 386 or 486 ELF file.\n", pszName);
3103	else if (pEhdr->e_version != EV_CURRENT)
3104	fprintf(stderr, "weakld: '%s': wrong ELF version (#2).\n", pszName);
3105	else if (pEhdr->e_ehsize != sizeof(*pEhdr))
3106	fprintf(stderr, "weakld: '%s': wrong ELF header size.\n", pszName);
3107	else if (pEhdr->e_phoff && pEhdr->e_phoff < sizeof(*pEhdr))
3108	fprintf(stderr, "weakld: '%s': bad ELF program header offset.\n", pszName);
3109	else if (pEhdr->e_shoff && pEhdr->e_shoff < sizeof(*pEhdr))
3110	fprintf(stderr, "weakld: '%s': bad ELF section header offset.\n", pszName);
3111	else if (pEhdr->e_phentsize != sizeof(Elf32_Phdr) && (pEhdr->e_phnum \|\| pEhdr->e_phentsize))
3112	fprintf(stderr, "weakld: '%s': wrong ELF program header size: %d\n", pszName, pEhdr->e_phentsize);
3113	else if (pEhdr->e_shentsize != sizeof(Elf32_Shdr) && (pEhdr->e_shnum \|\| pEhdr->e_shentsize))
3114	fprintf(stderr, "weakld: '%s': wrong ELF section header size: %d\n", pszName, pEhdr->e_shentsize);
3115	else
3116	return 1;
3117	return 0;
3118	}
3119
3120	/**
3121	* Adds a object module to the linking process.
3122	* The object module will be analysed and the file handle closed.
3123	*
3124	* @returns 0 on success.
3125	* @returns some unexplainable randomly picked number on failure.
3126	* @param pWld Linker instance to destroy.
3127	* @param phFile File handle to pszName.
3128	* @param pszName Object file to add. This may be an OMF library too,
3129	* but that only means that all it's content is to be
3130	* linked in as if they have been all specified on the
3131	* commandline.
3132	* @remark Don't call wld_add_object after wld_add_library()
3133	* or wld_generate_weaklib()!
3134	*/
3135	int WLDAddObject(PWLD pWld, FILE phFile, const char pszName)
3136	{
3137	union
3138	{
3139	OMFREC OmfRec;
3140	Elf32_Ehdr Ehdr;
3141	} uBuf;
3142	int rc = 0;
3143	if (!phFile)
3144	phFile = fopen(pszName, "rb");
3145	if (!phFile)
3146	{
3147	fprintf(stderr, "weakld: cannot open object file '%s'.\n", pszName);
3148	return 8;
3149	}
3150	WLDINFO(pWld, ("adding object %s.", pszName));
3151	if (fread(&uBuf.OmfRec, sizeof(uBuf.OmfRec), 1, phFile) != 1)
3152	{
3153	fprintf(stderr, "weakld: error reading object file '%s'.\n", pszName);
3154	fclose(phFile);
3155	return -1;
3156	}
3157
3158	/*
3159	* An object module is either a object (OMF or ELF) or a library (OMF).
3160	* In anycase all the modules it contains is to be added to the link.
3161	*/
3162	if (uBuf.OmfRec.chType == THEADR)
3163	{
3164	/* Single Object */
3165	PWLDMOD pMod = xmalloc(sizeof(*pMod));
3166	memset(pMod, 0, sizeof(*pMod));
3167	pMod->pszModName = strpool_add(pWld->pStrMisc, pszName);
3168	pMod->phFile = phFile;
3169	*pWld->ppObjsAdd = pMod;
3170	pWld->ppObjsAdd = &pMod->pNext;
3171	rc = pass1ReadOMFMod(pWld, pMod, 0);
3172	modClose(pMod);
3173	}
3174	else if (uBuf.OmfRec.chType == LIBHDR)
3175	{
3176	/* Library of object modules */
3177	while (uBuf.OmfRec.chType != LIBEND && uBuf.OmfRec.chType != (LIBEND \| REC32))
3178	{
3179	if (uBuf.OmfRec.chType == THEADR \|\| uBuf.OmfRec.chType == (THEADR \| REC32))
3180	{
3181	PWLDMOD pMod = xmalloc(sizeof(*pMod));
3182	memset(pMod, 0, sizeof(*pMod));
3183	pMod->pszModName = strpool_add(pWld->pStrMisc, pszName);
3184	pMod->phFile = phFile;
3185	pMod->off = ftell(phFile) - sizeof(uBuf.OmfRec);
3186	*pWld->ppObjsAdd = pMod;
3187	pWld->ppObjsAdd = &pMod->pNext;
3188	if (pWld->fFlags & WLDC_VERBOSE)
3189	{
3190	char achModName[256];
3191	unsigned char cchModName;
3192	cchModName = fgetc(phFile);
3193	achModName[fread(achModName, 1, cchModName, phFile)] = '\0';
3194	fprintf(stderr, "weakld: info: adding library member '%s'.\n", achModName);
3195	}
3196	rc = pass1ReadOMFMod(pWld, pMod, 0);
3197	pMod->phFile = NULL;
3198	if (rc)
3199	break;
3200	}
3201	else
3202	{
3203	/* skip to the net record */
3204	fseek(phFile, uBuf.OmfRec.cb, SEEK_CUR);
3205	}
3206
3207	/* read next record */
3208	fread(&uBuf.OmfRec, sizeof(uBuf.OmfRec), 1, phFile);
3209	}
3210	fclose(phFile);
3211	}
3212	else if ( uBuf.Ehdr.e_ident[EI_MAG0] == ELFMAG0
3213	&& uBuf.Ehdr.e_ident[EI_MAG1] == ELFMAG1
3214	&& uBuf.Ehdr.e_ident[EI_MAG2] == ELFMAG2
3215	&& fread((char *)&uBuf.Ehdr + sizeof(uBuf.OmfRec),
3216	sizeof(uBuf.Ehdr) - sizeof(uBuf.OmfRec), 1, phFile) == 1
3217	&& uBuf.Ehdr.e_ident[EI_MAG3] == ELFMAG3)
3218	{
3219	if (wldIsValidElfHdr(&uBuf.Ehdr, pszName))
3220	{
3221	/* Single Object */
3222	PWLDMOD pMod = xmalloc(sizeof(*pMod));
3223	memset(pMod, 0, sizeof(*pMod));
3224	pMod->pszModName = strpool_add(pWld->pStrMisc, pszName);
3225	pMod->phFile = phFile;
3226	*pWld->ppObjsAdd = pMod;
3227	pWld->ppObjsAdd = &pMod->pNext;
3228	rc = pass1ReadELFMod(pWld, pMod, 0);
3229	modClose(pMod);
3230	}
3231	else
3232	{
3233	fclose(phFile);
3234	rc = -1;
3235	}
3236	}
3237	else
3238	{
3239	fclose(phFile);
3240	fprintf(stderr, "weakld: invalid object file '%s'.\n", pszName);
3241	rc = -1;
3242	}
3243
3244	return rc;
3245	}
3246
3247
3248	/**
3249	* Callback function for parsing a module definition file.
3250	*
3251	* @returns 0 on success.
3252	* @returns -1 to stop the parsing.
3253	* @param pMD Pointer to module definition file handle.
3254	* @param pStmt Statement we're processing.
3255	* @param eToken Token we're processing.
3256	* @param pvArg Private arguments - pointer to an WLDDEFCBPARAM structure.
3257	* On failure, we'll update the structures rc member.
3258	*/
3259	static int wldDefCallback(struct _md pMD, const _md_stmt pStmt, _md_token eToken, void *pvArg)
3260	{
3261	unsigned fFlags;
3262	unsigned uOrdinal;
3263	unsigned cWords;
3264	PWLDSYM pSym;
3265	PWLDDEFCBPARAM pParam = (PWLDDEFCBPARAM)pvArg;
3266
3267	switch (eToken)
3268	{
3269	/*
3270	* One import.
3271	*/
3272	case _MD_IMPORTS:
3273	uOrdinal = 0;
3274	if (pStmt->import.flags & _MDIP_ORDINAL)
3275	uOrdinal = pStmt->import.ordinal;
3276	pSym = symAddImport(pParam->pWld, pParam->pMod, 0,
3277	pStmt->import.entryname[0] ? pStmt->import.entryname : pStmt->import.internalname, -1,
3278	pStmt->import.internalname, -1,
3279	pStmt->import.modulename, -1,
3280	uOrdinal);
3281	if (!pSym)
3282	{
3283	pParam->rc = -3;
3284	return -3;
3285	}
3286	break;
3287
3288
3289	/*
3290	* One export.
3291	*/
3292	case _MD_EXPORTS:
3293	fFlags = uOrdinal = cWords = 0;
3294	if (pStmt->export.flags & _MDEP_ORDINAL)
3295	uOrdinal = pStmt->export.ordinal;
3296	if (pStmt->export.flags & _MDEP_RESIDENTNAME)
3297	fFlags \|= WLDSEF_NONRESIDENT;
3298	else if (pStmt->export.flags & _MDEP_NONAME)
3299	fFlags \|= WLDSEF_NONAME;
3300	else
3301	fFlags \|= WLDSEF_DEFAULT;
3302	if (pStmt->export.flags & _MDEP_NODATA)
3303	fFlags \|= WLDSEF_NODATA;
3304	if (pStmt->export.flags & _MDEP_PWORDS)
3305	cWords = pStmt->export.pwords;
3306	pSym = symAddExport(pParam->pWld, pParam->pMod, 0,
3307	fFlags \| WLDSEF_DEF_FILE, cWords,
3308	pStmt->export.entryname, -1,
3309	pStmt->export.internalname, -1,
3310	uOrdinal);
3311	if (!pSym)
3312	{
3313	pParam->rc = -4;
3314	return -4;
3315	}
3316	break;
3317
3318	/*
3319	* Parse error.
3320	*/
3321	case _MD_parseerror:
3322	modErr(pParam->pMod, "Parse error %d on line %d. (stmt=%d)",
3323	pStmt->error.code, _md_get_linenumber(pMD), pStmt->error.stmt);
3324	pParam->rc = -2;
3325	break;
3326
3327	/*
3328	* Ignore everything else (it's here to get rid of gcc warnings).
3329	*/
3330	default:
3331	break;
3332	}
3333	return 0;
3334	}
3335
3336
3337	/**
3338	* Adds an definition file to the linking process.
3339	* The definition file will be analysed and the file handle closed.
3340	*
3341	* @returns 0 on success.
3342	* @returns some unexplainable randomly picked number on failure.
3343	* @param pWld Linker instance to destroy.
3344	* @param phFile File handle to pszName. If NULL we'll try open it.
3345	* The handle may be closed on exit, or latest when
3346	* we destroy the linker.
3347	* @param pszName Definition file to add.
3348	* @remark Don't call wld_add_deffile after wld_add_library()
3349	* or wld_generate_weaklib()!
3350	*/
3351	int WLDAddDefFile(PWLD pWld, FILE phFile, const char pszName)
3352	{
3353	struct _md * pMD;
3354	int rc = -1;
3355	if (!phFile)
3356	phFile = fopen(pszName, "r");
3357	if (!phFile)
3358	{
3359	wldErr(pWld, "cannot open deffile file '%s'.\n", pszName);
3360	return 8;
3361	}
3362	WLDINFO(pWld, ("** PARSE DEFINITIONS FILE **"));
3363	WLDINFO(pWld, (" %s", pszName));
3364
3365	if (pWld->pDef)
3366	wldWarn(pWld, "%s: There is already a definition file '%s' loaded.", pszName, pWld->pDef->pszModName);
3367
3368	/*
3369	* Process the .def file and be done with it.
3370	*/
3371	pMD = _md_use_file(phFile);
3372	if (pMD)
3373	{
3374	PWLDMOD pMod;
3375	WLDDEFCBPARAM param;
3376
3377	pMod = xmalloc(sizeof(*pMod));
3378	memset(pMod, 0, sizeof(*pMod));
3379	pMod->off = -1;
3380	pMod->pszModName = strpool_add(pWld->pStrMisc, pszName);
3381	pWld->pDef = pMod;
3382
3383	/* parse it */
3384	_md_next_token(pMD);
3385	param.pWld = pWld;
3386	param.pMod = pMod;
3387	param.rc = 0;
3388	rc = _md_parse(pMD, wldDefCallback, &param);
3389	_md_close(pMD);
3390	}
3391	else
3392	wldErr(pWld, "_md_use_file on '%s'.\n", pszName);
3393
3394	fclose(phFile);
3395	return rc;
3396	}
3397
3398
3399	/**
3400	* Adds a library module to the linking process.
3401	* The library module will be processed and the file handle eventually closed.
3402	*
3403	* @returns 0 on success.
3404	* @returns some unexplainable randomly picked number on failure.
3405	* @param pWld Linker instance to destroy.
3406	* @param phFile File handle to pszName. If NULL we'll try open it.
3407	* The handle may be closed on exit, or latest when
3408	* we destroy the linker.
3409	* @param pszName Library file to add. This may be an OMF object too.
3410	* @author Don't call wld_add_library after wld_generate_weaklib()!
3411	*/
3412	int WLDAddLibrary(PWLD pWld, FILE phFile, const char pszName)
3413	{
3414	PWLDLIB pLib;
3415
3416	if (!phFile)
3417	phFile = fopen(pszName, "r");
3418	if (!phFile)
3419	{
3420	fprintf(stderr, "weakld: cannot open library file '%s'.\n", pszName);
3421	return 8;
3422	}
3423	WLDINFO(pWld, ("adding library %s\n", pszName));
3424
3425	/* add it to the link, do nothing till we're asked to do the searching. */
3426	pLib = xmalloc(sizeof(*pLib));
3427	memset(pLib, 0, sizeof(*pLib));
3428	pLib->phFile = phFile;
3429	pLib->pszLibName = strpool_add(pWld->pStrMisc, pszName);
3430	pLib->pNext = NULL;
3431
3432	/* read the library header, detect the format. */
3433	if ( !fseek(phFile, 0, SEEK_SET)
3434	&& fread(&pLib->u.Omf.LibHdr, sizeof(OMFREC), 1, phFile) == 1)
3435	{
3436	int rc;
3437	if (pLib->u.Omf.LibHdr.chType == LIBHDR)
3438	{
3439	pLib->fOmfLib = 1;
3440	if (fread(&pLib->u.Omf.LibHdr.offDict, sizeof(pLib->u.Omf.LibHdr) - sizeof(OMFREC), 1, phFile) == 1)
3441	rc = 0;
3442	else
3443	rc = libErr(pLib, "Failed reading OMF library header.");
3444	}
3445	else if (pLib->u.Omf.LibHdr.chType == THEADR)
3446	pLib->fOmfLib = 1;
3447	else if (!memcmp(&pLib->u.Omf.LibHdr, ARMAG, sizeof(OMFREC)))
3448	{
3449	char achMagic[SARMAG];
3450	if (fread(achMagic, SARMAG - sizeof(OMFREC), 1, phFile) == 1)
3451	{
3452	if (!memcmp(achMagic, ARMAG + sizeof(OMFREC), SARMAG - sizeof(OMFREC)))
3453	{
3454	pLib->fOmfLib = 0;
3455	pLib->u.Ar.uDummy = 0;
3456	rc = 0;
3457	}
3458	else
3459	rc = libErr(pLib, "Invalid library format.");
3460	}
3461	else
3462	rc = libErr(pLib, "Failed reading AR library magic.");
3463	}
3464	else
3465	rc = libErr(pLib, "Invalid library format.");
3466
3467	if (rc == 0)
3468	{
3469	/* link it in */
3470	*pWld->ppLibsAdd = pLib;
3471	pWld->ppLibsAdd = &pLib->pNext;
3472	libClose(pLib);
3473
3474	return 0;
3475	}
3476	}
3477	else
3478	{
3479	/* We failed. */
3480	libErr(pLib, "Invalid library format or read error.");
3481	}
3482
3483	fclose(phFile);
3484	free(pLib);
3485	return -1;
3486	}
3487
3488
3489	/**
3490	* Does the linker pass one - chiefly library search as .def and .obj is
3491	* already processed as pass 1.
3492	*
3493	* @returns 0 on success (all symbols resolved)
3494	* @returns 42 if there are unresolved symbols.
3495	* @returns Something else on all other errors.
3496	* @param pWld Linker Instance.
3497	*/
3498	int WLDPass1(PWLD pWld)
3499	{
3500	int fMore;
3501	int cLoaded;
3502	int fFirstTime = 1;
3503
3504	WLDINFO(pWld, ("** PASS ONE **"));
3505	WLDINFO(pWld, ("** LIBRARY SEARCH **"));
3506	do
3507	{
3508	PWLDLIB pLib;
3509
3510	WLDINFO(pWld, ("-- Begin Library Pass --"));
3511	cLoaded = fMore = 0;
3512	for (pLib = pWld->pLibs; pLib; pLib = pLib->pNext)
3513	{
3514	int rc;
3515	WLDSLEPARAM param;
3516	WLDINFO(pWld, (" Searching %s", pLib->pszLibName));
3517
3518	/*
3519	* Open the library
3520	*/
3521	if (!libOpen(pLib))
3522	continue;
3523
3524	/*
3525	* Load extended dictionary if we wanna use it.
3526	*/
3527	if (fFirstTime && !(pWld->fFlags & WLDC_NO_EXTENDED_DICTIONARY_SEARCH))
3528	libLoadDict(pLib);
3529	else
3530	libCloseDict(pLib);
3531
3532	/*
3533	* Enumerate undefined symbols and try load them from this library.
3534	*/
3535	do
3536	{
3537	param.cLoaded = 0;
3538	param.pLib = pLib;
3539	if (pLib->pDict)
3540	rc = symEnum(pWld, &pWld->Global, WLDSF_UNDEF, WLDSF_TYPEMASK \| WLDSF_WEAK, symSearchLibEnum, &param);
3541	else
3542	{
3543	rc = libLoadUndefSymbols(pWld, pLib, NULL, &param.cLoaded);
3544	if (rc == 42)
3545	rc = 0;
3546	}
3547	cLoaded += param.cLoaded;
3548	} while (!rc && param.cLoaded > 0);
3549
3550	/* close it */
3551	libClose(pLib);
3552	if (rc && rc != 42)
3553	return rc;
3554	}
3555
3556	/* We only trust this if it's set. */
3557	fMore = symHaveUndefined(pWld);
3558	fFirstTime = 0;
3559	} while (fMore && cLoaded > 0);
3560
3561	/* @todo: proper warning? */
3562	if (fMore)
3563	symPrintUnDefs(pWld);
3564
3565	return fMore ? 42 : 0;
3566	}
3567
3568
3569
3570	/**
3571	* Write the start of an weak alias object.
3572	*
3573	* @returns 0 on success
3574	* @returns -1 on failure.
3575	* @param pWld Linker instance.
3576	* @param phFile Output file.
3577	* @param pszName Object name.
3578	* @remark Link386 accepts anything as long as THEADR/LHEADR is there.
3579	* VACxxx want's more stuff.
3580	*/
3581	static int wldObjStart(PWLD pWld, FILE phFile, const char pszName)
3582	{
3583	#pragma pack(1)
3584	struct omfstuff
3585	{
3586	OMFREC hdr;
3587	char ach[128];
3588	} omf;
3589	#pragma pack()
3590	int cch;
3591	#if 0
3592	int i;
3593	static const char * apszLNAMEs[] =
3594	{
3595	"", /* 1 */
3596	"TEXT32", /* 2 */
3597	"DATA32", /* 3 */
3598	"BSS32", /* 4 */
3599	"CODE", /* 5 */
3600	"DATA", /* 6 */
3601	"BSS", /* 7 */
3602	"FLAT", /* 8 */
3603	"DGROUP", /* 9 */
3604	};
3605	#endif
3606
3607	/* THEADR */
3608	omf.hdr.chType = THEADR;
3609	cch = strlen(pszName);
3610	omf.hdr.cb = 2 + cch;
3611	omf.ach[0] = cch;
3612	memcpy(&omf.ach[1], pszName, cch);
3613	omf.ach[cch + 1] = 0;
3614	if (fwrite(&omf, omf.hdr.cb + sizeof(OMFREC), 1, phFile) != 1)
3615	{
3616	wldErr(pWld, "Error occured while writing weak aliases. (4)");
3617	return -1;
3618	}
3619
3620	/* COMENT - IDM */
3621	omf.hdr.chType = COMENT;
3622	cch = strlen("INNIDM");
3623	omf.hdr.cb = cch + 5;
3624	omf.ach[0] = 0x00; /* flags */
3625	omf.ach[1] = CLASS_IDMDLL; /* class */
3626	omf.ach[2] = cch;
3627	memcpy(&omf.ach[3], "INNIDM", cch);
3628	omf.ach[3+cch] = 0;
3629	if (fwrite(&omf, omf.hdr.cb + sizeof(OMFREC), 1, phFile) != 1)
3630	{
3631	wldErr(pWld, "Error occured while writing weak aliases. (5)");
3632	return -1;
3633	}
3634	#if 0
3635	/* COMENT - DEBUG INFO */
3636	omf.hdr.chType = COMENT;
3637	omf.hdr.cb = 6;
3638	omf.ach[0] = 0x80; /* flags */
3639	omf.ach[1] = CLASS_DBGTYPE; /* class */
3640	omf.ach[2] = 3;
3641	omf.ach[3] = 'H';
3642	omf.ach[4] = 'L';
3643	omf.ach[5] = 0;
3644	if (fwrite(&omf, omf.hdr.cb + sizeof(OMFREC), 1, phFile) != 1)
3645	{
3646	wldErr(pWld, "Error occured while writing weak aliases. (6)");
3647	return -1;
3648	}
3649
3650	/* LNAMES for VACxxx */
3651	omf.hdr.chType = LNAMES;
3652	omf.hdr.cb = 1; /* crc */
3653	for (i = 0; i < sizeof(apszLNAMEs) / sizeof(apszLNAMEs[0]); i++)
3654	{
3655	cch = strlen(apszLNAMEs[i]);
3656	omf.ach[omf.hdr.cb - 1] = cch;
3657	memcpy(&omf.ach[omf.hdr.cb], apszLNAMEs[i], cch);
3658	omf.hdr.cb += cch + 1;
3659	}
3660	omf.ach[omf.hdr.cb - 1] = 0; /* crc */
3661	if (fwrite(&omf, omf.hdr.cb + sizeof(OMFREC), 1, phFile) != 1)
3662	{
3663	wldErr(pWld, "Error occured while writing weak aliases. (7)");
3664	return -1;
3665	}
3666
3667	/* SEGDEF - TEXT32 */
3668	omf.hdr.chType = SEGDEF;
3669	omf.hdr.cb = 7;
3670	omf.ach[0] = 0x69; /* attributes */
3671	omf.ach[1] = omf.ach[2] = 0; /* segment size (0) */
3672	omf.ach[3] = 2; /* "TEXT32" LNAME index. */
3673	omf.ach[4] = 5; /* "CODE" LNAME index. */
3674	omf.ach[5] = 1; /* "" LNAME index. */
3675	omf.ach[6] = 0; /* crc */
3676	if (fwrite(&omf, omf.hdr.cb + sizeof(OMFREC), 1, phFile) != 1)
3677	{
3678	wldErr(pWld, "Error occured while writing weak aliases. (8)");
3679	return -1;
3680	}
3681
3682	/* SEGDEF - DATA32 */
3683	omf.hdr.chType = SEGDEF;
3684	omf.hdr.cb = 7;
3685	omf.ach[0] = 0x69; /* attributes */
3686	omf.ach[1] = omf.ach[2] = 0; /* segment size (0) */
3687	omf.ach[3] = 3; /* "TEXT32" LNAME index. */
3688	omf.ach[4] = 6; /* "CODE" LNAME index. */
3689	omf.ach[5] = 1; /* "" LNAME index. */
3690	omf.ach[6] = 0; /* crc */
3691	if (fwrite(&omf, omf.hdr.cb + sizeof(OMFREC), 1, phFile) != 1)
3692	{
3693	wldErr(pWld, "Error occured while writing weak aliases. (9)");
3694	return -1;
3695	}
3696
3697	/* SEGDEF - BSS32 */
3698	omf.hdr.chType = SEGDEF;
3699	omf.hdr.cb = 7;
3700	omf.ach[0] = 0x69; /* attributes */
3701	omf.ach[1] = omf.ach[2] = 0; /* segment size (0) */
3702	omf.ach[3] = 4; /* "TEXT32" LNAME index. */
3703	omf.ach[4] = 6; /* "CODE" LNAME index. */
3704	omf.ach[5] = 1; /* "" LNAME index. */
3705	omf.ach[6] = 0; /* crc */
3706	if (fwrite(&omf, omf.hdr.cb + sizeof(OMFREC), 1, phFile) != 1)
3707	{
3708	wldErr(pWld, "Error occured while writing weak aliases. (10)");
3709	return -1;
3710	}
3711
3712	/* GROUP - FLAT */
3713	omf.hdr.chType = GRPDEF;
3714	omf.hdr.cb = 2;
3715	omf.ach[0] = 8; /* "FLAT" LNAME index */
3716	omf.ach[1] = 0; /* crc */
3717	if (fwrite(&omf, omf.hdr.cb + sizeof(OMFREC), 1, phFile) != 1)
3718	{
3719	wldErr(pWld, "Error occured while writing weak aliases. (11)");
3720	return -1;
3721	}
3722
3723	/* GROUP - DGROUP */
3724	omf.hdr.chType = GRPDEF;
3725	omf.hdr.cb = 6;
3726	omf.ach[0] = 9; /* "DGROUP" LNAME index */
3727	omf.ach[1] = 0xff;
3728	omf.ach[2] = 3; /* "BSS32" SEGDEF index */
3729	omf.ach[3] = 0xff;
3730	omf.ach[4] = 2; /* "DATA32" SEGDEF index */
3731	omf.ach[5] = 0; /* crc */
3732	if (fwrite(&omf, omf.hdr.cb + sizeof(OMFREC), 1, phFile) != 1)
3733	{
3734	wldErr(pWld, "Error occured while writing weak aliases. (12)");
3735	return -1;
3736	}
3737	#endif
3738
3739	return 0;
3740	}
3741
3742
3743
3744	/**
3745	* Write the end of object stuff for an weak alias object.
3746	*
3747	* @returns 0 on success.
3748	* @returns -1 on failure.
3749	* @param pWld Linker instance.
3750	* @param phFile Output file.
3751	* @param cbPage Library page size.
3752	*/
3753	static int wldObjEnd(PWLD pWld, FILE *phFile, int cbPage)
3754	{
3755	#pragma pack(1)
3756	struct omfstuff
3757	{
3758	OMFREC hdr;
3759	char ach[32];
3760	} omf;
3761	#pragma pack()
3762
3763	#if 0
3764	/* PASS1 end COMENT */
3765	omf.hdr.chType = COMENT;
3766	omf.hdr.cb = 4;
3767	omf.ach[0] = 0x80; /* flags */
3768	omf.ach[1] = CLASS_PASS; /* class */
3769	omf.ach[2] = 1; /* subclass */
3770	omf.ach[3] = 0; /* crc */
3771	if (fwrite(&omf, omf.hdr.cb + sizeof(OMFREC), 1, phFile) != 1)
3772	{
3773	wldErr(pWld, "Error occured while writing weak aliases. (1)");
3774	return -1;
3775	}
3776	#endif
3777
3778	/* MODEND */
3779	omf.hdr.chType = MODEND \| REC32;
3780	omf.hdr.cb = 2;
3781	memset(&omf.ach[0], 0, sizeof(omf.ach));
3782	if (fwrite(&omf, omf.hdr.cb + sizeof(OMFREC), 1, phFile) != 1)
3783	{
3784	wldErr(pWld, "Error occured while writing weak aliases. (2)");
3785	return -1;
3786	}
3787
3788	/* padding */
3789	while (ftell(phFile) % cbPage)
3790	{
3791	if (fputc('\0', phFile) < 0)
3792	{
3793	wldErr(pWld, "Error occured while writing weak aliases. (3)");
3794	return -1;
3795	}
3796	}
3797	return 0;
3798	}
3799
3800
3801	/** Parameter structure for wldGenerateObjEnum(). */
3802	typedef struct wldGenerateObjEnum_param
3803	{
3804	/** Output file stream */
3805	FILE * phFile;
3806	/** Number of aliases in current object. (0 means first) */
3807	unsigned cAliases;
3808	/** Library file number */
3809	unsigned iLibFile;
3810	} WLDGOEPARAM, *PWLDGOEPARAM;
3811
3812
3813	/**
3814	* Symbol enumeration callback function of wld_generate_weakobj().
3815	* It writes alias for weak symbols.
3816	*
3817	* @returns 0 on success
3818	* @returns !0 on failure after writing sufficient error message.
3819	* @param pWld Linker instance.
3820	* @param pSym Symbol.
3821	* @param pvUser Pointer to a FILE stream.
3822	*/
3823	static int wldGenerateObjEnum(PWLD pWld, PWLDSYM pSym, void *pvUser)
3824	{
3825	#pragma pack(1)
3826	struct omfstuff
3827	{
3828	OMFREC hdr;
3829	union
3830	{
3831	char ach[640];
3832	OMFLIBHDRX libhdr;
3833	};
3834	} omf;
3835	#pragma pack()
3836	PWLDGOEPARAM pParam = (PWLDGOEPARAM)pvUser;
3837	int cchAlias;
3838	int cch;
3839
3840	/*
3841	* Skip non-weak symbols (a bit of paranoia).
3842	*/
3843	if ( !pSym->pszWeakName
3844	\|\| pSym->pszName == pSym->pszWeakName)
3845	{
3846	WLDDBG(("not weak: '%s'\n", pSym->pszName));
3847	return 0;
3848	}
3849
3850	/*
3851	* Create the alias record.
3852	*/
3853	cchAlias = strlen(pSym->pszName);
3854	cch = strlen(pSym->pszWeakName);
3855	WLDINFO(pWld, ("using weak %s for %s", pSym->pszWeakName, pSym->pszName));
3856
3857	/* paranoia */
3858	if (cchAlias > 255)
3859	{
3860	wldErr(pWld, "Symbol '%s' are too long (%d).", pSym->pszName, cchAlias);
3861	return -1;
3862	}
3863	if (cch > 255)
3864	{
3865	wldErr(pWld, "Symbol '%s' are too long (%d).", pSym->pszWeakName, cch);
3866	return -1;
3867	}
3868
3869	/* end the current object? */
3870	if ((pWld->fFlags & WLDC_LINKER_LINK386) && pParam->cAliases >= 32)
3871	{
3872	int rc = wldObjEnd(pWld, pParam->phFile, 32);
3873	if (rc)
3874	return rc;
3875	pParam->cAliases = 0;
3876	}
3877
3878	/* make new object ? */
3879	if (!pParam->cAliases)
3880	{
3881	sprintf(omf.ach, "wk%d.obj", pParam->iLibFile++);
3882	int rc = wldObjStart(pWld, pParam->phFile, omf.ach);
3883	if (rc)
3884	return rc;
3885	}
3886
3887	/* Alias record */
3888	omf.hdr.chType = ALIAS;
3889	omf.hdr.cb = cchAlias + cch + 3;
3890	omf.ach[0] = cchAlias;
3891	memcpy(&omf.ach[1], pSym->pszName, cchAlias); /* alias */
3892	omf.ach[cchAlias + 1] = cch;
3893	memcpy(&omf.ach[cchAlias + 2], pSym->pszWeakName, cch); /* subtitute */
3894	omf.ach[cchAlias + cch + 2] = 0; /* crc */
3895	if (fwrite(&omf, omf.hdr.cb + sizeof(OMFREC), 1, pParam->phFile) != 1)
3896	{
3897	wldErr(pWld, "Error occured while writing weak/trunc aliases. (2)");
3898	return -1;
3899	}
3900	pParam->cAliases++;
3901
3902	return 0;
3903	}
3904
3905
3906	/** Parameter structure for wldGenerateDefCallback (module definition parser callback). */
3907	typedef struct wldGenerateDefCallback_param
3908	{
3909	/** Linker Instance. */
3910	PWLD pWld;
3911	/** Read file stream of the current definition file. */
3912	FILE *phOrgFile;
3913	/** Write file stream of the new, modified, defintion file. */
3914	FILE *phNewFile;
3915	/** Our current linenumber index. */
3916	unsigned iLine;
3917	/** Set if we have processed any weak __declspec(dllexport) symbols. */
3918	unsigned fWeakDllExport;
3919	} WLDGDCPARAM, *PWLDGDCPARAM;
3920
3921	/**
3922	* Callback function for doing weak aliasing of a module definition file.
3923	*
3924	* @returns 0 on success.
3925	* @returns -1 to stop the parsing.
3926	* @param pMD Pointer to module definition file handle.
3927	* @param pStmt Statement we're processing.
3928	* @param eToken Token we're processing.
3929	* @param pvArg Pointer to a WLDGDCPARAM structure.
3930	* @sketch
3931	*
3932	* If it exports a weak symbol Then
3933	* While linenumber(_md) > linenumber phOrgFile
3934	* Copy line from phOrgFile to phNewFile
3935	* Write modifed line to phNewFile and
3936	* Skip a line in phOrgFile.
3937	* Endif
3938	*
3939	* The caller of _md_parse will make sure the last chunk of the file is
3940	* copied to the new file.
3941	*/
3942	static int wldGenerateDefCallback(struct _md pMD, const _md_stmt pStmt, _md_token eToken, void *pvArg)
3943	{
3944	PWLDGDCPARAM pParam = (PWLDGDCPARAM)pvArg;
3945
3946	switch (eToken)
3947	{
3948	/*
3949	* One export.
3950	*/
3951	case _MD_EXPORTS:
3952	{
3953	char szTmp[1024];
3954	int cch;
3955	PWLDSYM pSymInt = NULL;
3956	PWLDSYM pSymExp;
3957
3958	pSymExp = symLookup(pParam->pWld, pStmt->export.entryname);
3959	if (pStmt->export.internalname[0])
3960	pSymInt = symLookup(pParam->pWld, pStmt->export.internalname);
3961	if (!pSymExp && !pSymInt)
3962	{
3963	wldWarn(pParam->pWld, "Failed to find exported symbols! (%s, %s, %d)",
3964	pStmt->export.entryname, pStmt->export.internalname, pStmt->export.ordinal);
3965	return 0; /* .ignore it. good idea? */
3966	}
3967
3968	WLDDBG2(("wldGenerateDefCallback: '%s', '%s'", pSymExp->pszName, pSymInt ? pSymInt->pszName : "<the-same-name>"));
3969
3970	/* mark the exported symbol exported. */
3971	pSymExp->fFlags \|= WLDSF_EXPORT_DEF;
3972
3973	/* Skip it all if neither of the symbols are weak. */
3974	if ( !(pSymExp->fFlags & WLDSF_WEAK)
3975	&& (!pSymInt \|\| !(pSymInt->fFlags & WLDSF_WEAK)))
3976	return 0;
3977
3978	/* Copy line from org to new so we're up to date. */
3979	while (pParam->iLine + 1 < pStmt->line_number)
3980	{
3981	if (!fgets(szTmp, 512 /* this is the size _md_* uses */, pParam->phOrgFile))
3982	{
3983	wldErr(pParam->pWld, "Read error while reading original .def file.");
3984	strcpy(szTmp, ";read error");
3985	}
3986	pParam->iLine++;
3987	if (fputs(szTmp, pParam->phNewFile) < 0)
3988	return wldErr(pParam->pWld, "Write error.");
3989	}
3990
3991	/* Set the correct $w$ internal symbol. */
3992	if (pSymInt && (pSymInt->fFlags & WLDSF_WEAK))
3993	cch = sprintf(szTmp, " \"%s\" = \"%s\"", pStmt->export.entryname, pSymInt->pszWeakName);
3994	else
3995	{
3996	cch = sprintf(szTmp, " \"%s\" = \"%s\"", pStmt->export.entryname, pSymExp->pszWeakName);
3997	if (!(pParam->pWld->fFlags & WLDC_LINKER_WLINK))
3998	pSymExp->fFlags \|= WLDSF_WEAKALIASDONE;
3999	}
4000	if (pStmt->export.flags & _MDEP_ORDINAL)
4001	cch += sprintf(&szTmp[cch], " @%d", pStmt->export.ordinal);
4002	if (pStmt->export.flags & _MDEP_RESIDENTNAME)
4003	cch += sprintf(&szTmp[cch], " RESIDENTNAME");
4004	if (pStmt->export.flags & _MDEP_NONAME)
4005	cch += sprintf(&szTmp[cch], " NONAME");
4006	if (pStmt->export.flags & _MDEP_NODATA)
4007	cch += sprintf(&szTmp[cch], " NODATA");
4008	if (pStmt->export.flags & _MDEP_PWORDS)
4009	cch += sprintf(&szTmp[cch], " %d", pStmt->export.pwords);
4010	cch += sprintf(&szTmp[cch], " ; !weakld changed this!\n");
4011
4012	if (fputs(szTmp, pParam->phNewFile) < 0)
4013	return wldErr(pParam->pWld, "Write error.");
4014
4015	/* skip line */
4016	pParam->iLine++;
4017	fgets(szTmp, 512 /* this is the size _md_* uses */, pParam->phOrgFile);
4018	break;
4019	}
4020
4021	/*
4022	* Parse error.
4023	*/
4024	case _MD_parseerror:
4025	wldErr(pParam->pWld, "Parse error %d on line %d. (errorcode=%d stmt=%d)",
4026	_md_get_linenumber(pMD), pStmt->error.code, pStmt->error.stmt);
4027	break;
4028
4029	/*
4030	* Everything else is passed thru line by line.
4031	*/
4032	default:
4033	break;
4034	}
4035	return 0;
4036	}
4037
4038
4039	/**
4040	* Checks the __declspec(dllexport) symbols for weak symbols.
4041	* When a weak export is found, it will be added to the .def file.
4042	*
4043	* @returns 0 on success
4044	* @returns !0 on failure after writing sufficient error message.
4045	* @param pWld Linker instance.
4046	* @param pSym Symbol.
4047	* @param pvUser Pointer to a WLDGDCPARAM struct.
4048	*/
4049	static int wldGenerateDefExportEnum(PWLD pWld, PWLDSYM pSym, void *pvUser)
4050	{
4051	PWLDGDCPARAM pParam = (PWLDGDCPARAM)pvUser;
4052
4053	if (!pParam->fWeakDllExport)
4054	{
4055	/* copy the rest of the file if any changes was made. */
4056	char szTmp[512];
4057	while (!feof(pParam->phOrgFile) && fgets(szTmp, sizeof(szTmp), pParam->phOrgFile))
4058	if (fputs(szTmp, pParam->phNewFile) < 0)
4059	return wldErr(pWld, "Write error.");
4060
4061	if (fputs("\n"
4062	"; weakld added weak __declspec(dllexport) exports\n"
4063	"EXPORTS\n",
4064	pParam->phNewFile) < 0)
4065	return wldErr(pWld, "Write error.");
4066	pParam->fWeakDllExport = 1;
4067	}
4068
4069	/*
4070	* Now generate the export entry.
4071	*/
4072	if (!pSym->pAliasFor)
4073	{
4074	WLDINFO(pWld, ("Adding __declspec(dllexport) weak symbol '%s' to the definition aliasing '%s'",
4075	pSym->pszName, pSym->pszWeakName));
4076	fprintf(pParam->phNewFile, " \"%s\" = \"%s\"\n",
4077	pSym->pszName, pSym->pszWeakName);
4078	}
4079	else
4080	{
4081	WLDINFO(pWld, ("Adding __declspec(dllexport) weak symbol '%s' to the definition aliasing '%s' (alias)",
4082	pSym->pszName,
4083	pSym->pAliasFor->pszWeakName ? pSym->pAliasFor->pszWeakName : pSym->pAliasFor->pszName));
4084	fprintf(pParam->phNewFile, " \"%s\" = \"%s\"\n",
4085	pSym->pszName,
4086	pSym->pAliasFor->pszWeakName ? pSym->pAliasFor->pszWeakName : pSym->pAliasFor->pszName);
4087	}
4088	if (ferror(pParam->phNewFile))
4089	return wldErr(pWld, "Write error.");
4090	return 0;
4091	}
4092
4093
4094	/**
4095	* Generates an unique temporary file.
4096	*
4097	* @returns 0 on success.
4098	* @returns -1 on failure.
4099	* @param pWld Linker instance.
4100	* @param pszFile Where to put the filename.
4101	* @param pszPrefix Prefix.
4102	* @param pszSuffix Suffix.
4103	*/
4104	static int wldTempFile(PWLD pWld, char pszFile, const char pszPrefix, const char *pszSuffix)
4105	{
4106	struct stat s;
4107	unsigned c = 0;
4108	pid_t pid = getpid();
4109	static char s_szTmp[_MAX_PATH + 1];
4110
4111	/* We need to apply _realrealpath to the tmpdir, so resolve that once and for all. */
4112	if (!s_szTmp[0])
4113	{
4114	const char * pszTmp = getenv("TMP");
4115	if (!pszTmp) pszTmp = getenv("TMPDIR");
4116	if (!pszTmp) pszTmp = getenv("TEMP");
4117	if (!pszTmp) pszTmp = ".";
4118	if (!_realrealpath(pszTmp, s_szTmp, sizeof(s_szTmp)))
4119	{
4120	printf("emxomfld: _realrealpath failed on '%s'!!!\n", pszTmp);
4121	exit(1);
4122	}
4123	}
4124
4125	do
4126	{
4127	struct timeval tv = {0,0};
4128	if (c++ >= 200)
4129	return -1;
4130	gettimeofday(&tv, NULL);
4131	sprintf(pszFile, "%s\\%s%x%lx%d%lx%s", s_szTmp, pszPrefix, pid, tv.tv_sec, c, tv.tv_usec, pszSuffix);
4132	} while (!stat(pszFile, &s));
4133
4134	return 0;
4135	}
4136
4137
4138	/**
4139	* Generates a object file containing alias for resolving the weak
4140	* symbol references in the linked executable.
4141	* The filename of the object will be generated, but of course it
4142	* ends with '.obj'.
4143	*
4144	* @returns 0 on success.
4145	* @returns some unexplainable randomly picked number on failure.
4146	* @param pWld Linker instance.
4147	* @param pszObjName Where to put the name of the generated object file.
4148	* This is an empty string if no weak symbols were found!
4149	* @param pszDefName Where to put the name of the modified definition file.
4150	* This is an empty string if changes was required!
4151	*/
4152	int WLDGenerateWeakAliases(PWLD pWld, char pszObjName, char pszDefName)
4153	{
4154	FILE * phFile;
4155	int rc = 0;
4156
4157	/* zero returns */
4158	if (pszObjName)
4159	*pszObjName = '\0';
4160	if (pszDefName)
4161	*pszDefName = '\0';
4162
4163	/*
4164	* Do the definition file.
4165	*/
4166	if (pWld->pDef && pszDefName)
4167	{
4168	rc = wldTempFile(pWld, pszDefName, "wk", ".def");
4169	if (!rc)
4170	{
4171	WLDINFO(pWld, ("Generating definition file '%s' for weak exports.", pszDefName));
4172
4173	/* open output file */
4174	phFile = fopen(pszDefName, "w");
4175	if (phFile)
4176	{
4177	/* open original file */
4178	FILE *phOrgFile = fopen(pWld->pDef->pszModName, "r");
4179	if (phOrgFile)
4180	{
4181	/* open original def file with the ModDef library. */
4182	struct _md *pMD = _md_open(pWld->pDef->pszModName);
4183	if (pMD)
4184	{
4185	WLDGDCPARAM param;
4186	param.pWld = pWld;
4187	param.phOrgFile = phOrgFile;
4188	param.phNewFile = phFile;
4189	param.iLine = 0;
4190	param.fWeakDllExport = 0;
4191
4192	/* parse it */
4193	_md_next_token(pMD);
4194	rc = _md_parse(pMD, wldGenerateDefCallback, &param);
4195	_md_close(pMD);
4196
4197	/* now see if there are any aliases in __declspec(dllexport) statements. */
4198	if (!rc)
4199	{
4200	if (0)//pWld->fFlags & WLDC_LINKER_WLINK)
4201	rc = symEnum(pWld, &pWld->Global,
4202	WLDSF_EXPORT \| WLDSF_EXPORT_DEF \| WLDSF_WEAK, WLDSF_EXPORT \| WLDSF_EXPORT_DEF \| WLDSF_WEAK \| WLDSF_WEAKALIASDONE,
4203	wldGenerateDefExportEnum, &param);
4204	else
4205	rc = symEnum(pWld, &pWld->Global,
4206	WLDSF_EXPORT \| WLDSF_WEAK, WLDSF_EXPORT \| WLDSF_WEAK \| WLDSF_EXPORT_DEF \| WLDSF_WEAKALIASDONE,
4207	wldGenerateDefExportEnum, &param);
4208	}
4209
4210	/* copy the rest of the file if any changes was made. */
4211	if (!rc && param.iLine > 0)
4212	{
4213	char szTmp[512];
4214	while (fgets(szTmp, sizeof(szTmp), phOrgFile))
4215	if (fputs(szTmp, phFile) < 0)
4216	rc = wldErr(pWld, "Write error.");
4217	}
4218	else if (!rc && !param.fWeakDllExport)
4219	{
4220	/* no changes were made. */
4221	WLDINFO(pWld, ("No weak exports, removing file."));
4222	fclose(phFile);
4223	phFile = NULL;
4224	remove(pszDefName);
4225	*pszDefName = '\0';
4226	}
4227	}
4228	else
4229	rc = wldErr(pWld, "_md_open on '%s'.\n", pszDefName);
4230	fclose(phOrgFile);
4231	}
4232	else
4233	rc = wldErr(pWld, "Failed to open '%s' for reading.\n", pWld->pDef->pszModName);
4234	if (phFile)
4235	fclose(phFile);
4236	}
4237	else
4238	rc = wldErr(pWld, "Failed to open '%s' for writing.\n", pszDefName);
4239	}
4240	else
4241	wldErr(pWld, "Failed to generate temporary definition file for weak aliases.");
4242	}
4243
4244	/* cleanup */
4245	if (rc && pszDefName && *pszDefName)
4246	{
4247	remove(pszDefName);
4248	*pszDefName = '\0';
4249	}
4250
4251
4252	/*
4253	* Generate the object file
4254	*/
4255	if (!rc && pszObjName)
4256	{
4257	rc = wldTempFile(pWld, pszObjName, "wk", (pWld->fFlags & WLDC_LINKER_LINK386) ? ".lib" : ".obj");
4258	if (!rc)
4259	{
4260	WLDINFO(pWld, ("Generating object file '%s' for weak aliases.", pszObjName));
4261
4262	/* open it */
4263	phFile = fopen(pszObjName, "wb");
4264	if (phFile)
4265	{
4266	WLDGOEPARAM param;
4267	#pragma pack(1)
4268	struct omfstuff
4269	{
4270	OMFREC hdr;
4271	union
4272	{
4273	char ach[256];
4274	OMFLIBHDRX libhdr;
4275	};
4276	} omf;
4277	#pragma pack()
4278	off_t offAlias;
4279
4280	/* write start of file */
4281	if (pWld->fFlags & WLDC_LINKER_LINK386)
4282	{
4283	/* Write library file header.
4284	* Link386 have trouble with too many aliases in one object. So we
4285	* generate a library of objects.
4286	*/
4287	memset(&omf, 0, sizeof(omf));
4288	omf.hdr.chType = LIBHDR;
4289	omf.hdr.cb = 32 - 3;
4290	omf.libhdr.offDict = 0;
4291	omf.libhdr.cDictBlocks = 0;
4292	omf.libhdr.fchFlags = 1;
4293	if (fwrite(&omf, omf.hdr.cb + sizeof(OMFREC), 1, phFile) != 1)
4294	{
4295	wldErr(pWld, "Failed to write to '%s'.", pszObjName);
4296	rc = -1;
4297	}
4298	}
4299
4300	/* successfully wrote start of file? */
4301	if (!rc)
4302	{
4303	/*
4304	* Make aliases
4305	*/
4306	offAlias = ftell(phFile); /* save this to see if anything is added. */
4307	param.phFile = phFile;
4308	param.cAliases = 0;
4309	param.iLibFile = 0;
4310	rc = symEnum(pWld, &pWld->Global,
4311	WLDSF_WEAK, WLDSF_WEAK \| WLDSF_WEAKALIASDONE,
4312	wldGenerateObjEnum, &param);
4313	if (!rc)
4314	{
4315	/* Check if we need to fake a lot's of externals for working around an ILINK bug.
4316	* See defect #483 for details. Short summary: an array calculation in ilink is
4317	* assuming that library objects have less EXTDEFs than the object ones. So, for
4318	* pass2 an EXTDEF array may become too small.
4319	*/
4320	WLDINFO(pWld, ("cWeakAliases=%d cMaxObjExts=%d cMaxLibExts=%d",
4321	param.cAliases + (param.iLibFile - 1) * 32, pWld->cMaxObjExts, pWld->cMaxLibExts));
4322	if (pWld->cMaxObjExts < pWld->cMaxLibExts + 32 && !(pWld->fFlags & WLDC_LINKER_LINK386))
4323	{
4324	int i;
4325	if (!param.cAliases)
4326	{
4327	rc = wldObjStart(pWld, phFile, "extdefshack.obj");
4328	param.cAliases++;
4329	}
4330
4331	/* issue a lot's of extdefs. */
4332	omf.hdr.chType = EXTDEF;
4333	omf.hdr.cb = 0;
4334	for (i = 0; i < 10; i++)
4335	{
4336	omf.ach[omf.hdr.cb] = 9; /* string length */
4337	memcpy(&omf.ach[omf.hdr.cb + 1], "WEAK$ZERO", 9); /* external */
4338	omf.ach[omf.hdr.cb + 9 + 1] = 0; /* typeidx */
4339	omf.hdr.cb += 9 + 2;
4340	}
4341	omf.ach[omf.hdr.cb++] = 0; /* crc */
4342	for (i = pWld->cMaxLibExts + 32; i > 0; i -= 10)
4343	if (fwrite(&omf, omf.hdr.cb + sizeof(OMFREC), 1, phFile) != 1)
4344	{
4345	wldErr(pWld, "Failed to write to '%s'.", pszObjName);
4346	rc = -1;
4347	break;
4348	}
4349	}
4350
4351	/* Did we actually write anything to the file? */
4352	if (ftell(phFile) != offAlias)
4353	{
4354	/* Complete last object file? */
4355	if (pWld->fFlags & WLDC_LINKER_LINK386)
4356	{
4357	if (param.cAliases)
4358	rc = wldObjEnd(pWld, phFile, 32);
4359	if (!rc)
4360	{
4361	/* write end of library */
4362	memset(&omf, 0, sizeof(omf));
4363	omf.hdr.chType = LIBEND;
4364	omf.hdr.cb = 32 - 3;
4365	if (fwrite(&omf, omf.hdr.cb + sizeof(OMFREC), 1, phFile) != 1)
4366	{
4367	wldErr(pWld, "Failed to write to '%s'.", pszObjName);
4368	rc = -1;
4369	}
4370	}
4371	}
4372	else if (param.cAliases)
4373	rc = wldObjEnd(pWld, phFile, 1);
4374	}
4375	else
4376	{
4377	WLDINFO(pWld, ("No weak alias needed, removing file."));
4378	fclose(phFile);
4379	phFile = NULL;
4380	remove(pszObjName);
4381	*pszObjName = '\0';
4382	}
4383	}
4384	}
4385	if (phFile)
4386	fclose(phFile);
4387	}
4388	else
4389	{
4390	wldErr(pWld, "Failed to open '%s' for writing.", pszObjName);
4391	*pszObjName = '\0';
4392	}
4393	}
4394	else
4395	wldErr(pWld, "Failed to generate temporary object file for weak aliases.");
4396	}
4397
4398	/* cleanup */
4399	if (rc && pszObjName && *pszObjName)
4400	{
4401	remove(pszObjName);
4402	*pszObjName = '\0';
4403	}
4404
4405	return rc;
4406	}
4407

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