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Last change on this file since 91 was 91, checked in by umoeller, 24 years ago
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1
2	/*
3	*@@sourcefile configsys.c:
4	* contains helper functions for parsing and changing lines
5	* in the CONFIG.SYS file.
6	*
7	* Some of these used to be in stringh.c. However, that
8	* code was really old and was largely rewritten. Besides,
9	* this fixes some bugs that have popped up in WarpIN.
10	*
11	* Usage: All OS/2 programs.
12	*
13	* Function prefixes (new with V0.81):
14	* -- csys* CONFIG.SYS helper functions.
15	*
16	* Note: Version numbering in this file relates to XWorkplace version
17	* numbering.
18	*
19	*@@added V0.9.7 (2001-01-15) [umoeller]
20	*@@header "helpers\configsys.h"
21	*/
22
23	/*
24	* Copyright (C) 1997-2001 Ulrich Mller.
25	* This file is part of the "XWorkplace helpers" source package.
26	* This is free software; you can redistribute it and/or modify
27	* it under the terms of the GNU General Public License as published
28	* by the Free Software Foundation, in version 2 as it comes in the
29	* "COPYING" file of the XWorkplace main distribution.
30	* This program is distributed in the hope that it will be useful,
31	* but WITHOUT ANY WARRANTY; without even the implied warranty of
32	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
33	* GNU General Public License for more details.
34	*/
35
36	#define OS2EMX_PLAIN_CHAR
37	// this is needed for "os2emx.h"; if this is defined,
38	// emx will define PSZ as _signed_ char, otherwise
39	// as unsigned char
40
41	#define INCL_DOSERRORS
42	#include <os2.h>
43
44	#include <stdlib.h>
45	#include <stdio.h>
46	#include <string.h>
47	#include <ctype.h>
48	#include <math.h>
49
50	#include "setup.h" // code generation and debugging options
51
52	#include "helpers\dosh.h"
53	#include "helpers\stringh.h"
54	#include "helpers\xstring.h" // extended string helpers
55
56	#include "helpers\configsys.h" // CONFIG.SYS helpers
57
58	#pragma hdrstop
59
60	/*
61	*@@category: Helpers\Control program helpers\CONFIG.SYS
62	* CONFIG.SYS parsing and manipulation. See configsys.c.
63	*/
64
65	/*
66	*@@ csysLoadConfigSys:
67	* loads a CONFIG.SYS file.
68	*
69	* If pcszFile is specified, that file is loaded.
70	* If (pcszFile == NULL), this loads the system CONFIG.SYS
71	* file (?:\CONFIG.SYS on the boot drive).
72	*
73	* If this returns NO_ERROR, the contents of the file
74	* are put into ppszContents, which will then point
75	* to a new buffer (which must be free()'d by the caller).
76	*
77	* Note that in that buffer, all \r\n pairs have been
78	* converted to \n (as with fopen()).
79	*/
80
81	APIRET csysLoadConfigSys(const char *pcszFile, // in: CONFIG.SYS filename or NULL
82	PSZ *ppszContents)
83	{
84	APIRET arc = NO_ERROR;
85
86	CHAR szFile[CCHMAXPATH];
87	if (pcszFile == NULL)
88	{
89	sprintf(szFile, "%c:\\CONFIG.SYS", doshQueryBootDrive());
90	pcszFile = szFile;
91	}
92
93	arc = doshLoadTextFile(pcszFile,
94	ppszContents);
95
96	if (arc == NO_ERROR)
97	{
98	// convert all \r\n to \n
99	XSTRING strBuf;
100	xstrInitSet(&strBuf, *ppszContents);
101	xstrConvertLineFormat(&strBuf,
102	TRUE); // to C format
103	*ppszContents = strBuf.psz;
104	}
105
106	return (arc);
107	}
108
109	/*
110	*@@ csysWriteConfigSys:
111	*
112	*@@added V0.9.7 (2001-01-15) [umoeller]
113	*/
114
115	APIRET csysWriteConfigSys(const char *pcszFile, // in: CONFIG.SYS filename or NULL
116	const char *pcszContents,
117	PSZ pszBackup)
118	{
119	APIRET arc = NO_ERROR;
120
121	XSTRING strBuf;
122
123	CHAR szFile[CCHMAXPATH];
124	if (pcszFile == NULL)
125	{
126	sprintf(szFile, "%c:\\CONFIG.SYS", doshQueryBootDrive());
127	pcszFile = szFile;
128	}
129
130	// convert all \n to \r\n
131	xstrInitCopy(&strBuf, pcszContents, 0);
132	xstrConvertLineFormat(&strBuf,
133	FALSE); // C to OS/2 format
134
135	arc = doshWriteTextFile(pcszFile,
136	strBuf.psz,
137	NULL,
138	pszBackup);
139
140	xstrClear(&strBuf);
141
142	return (arc);
143	}
144
145	/*
146	*@@ csysFindKey:
147	* finds pcszKey in pcszSearchIn.
148	*
149	* This is similar to strhistr, but this one makes sure the
150	* key is at the beginning of a line. Spaces and tabs before
151	* the key are tolerated.
152	*
153	* Returns NULL if the key was not found. Otherwise this
154	* returns the exact pointer to pcszKey in pcszSearchIn
155	* and puts the address of the first character of the line
156	* (after \r or \n) into ppStartOfLine.
157	*
158	* Used by csysGetParameter/csysSetParameter; useful
159	* for analyzing CONFIG.SYS settings.
160	*
161	* Remarks:
162	*
163	* -- With pcszKey, you can either specify a CONFIG.SYS
164	* key WITH an equals sign (e.g. search for "LIBPATH=")
165	* or the key name only (e.g. "SET SHELL").
166	*
167	* Only in the latter case, this function makes sure
168	* that the search key is complete; e.g. it will not
169	* find "SET SHELLHANDLESINC=" then.
170	*
171	* -- If the line found starts with leading spaces,
172	* *ppStartOfLine will still receive the start of
173	* the line.
174	* For example, if you're searching for "SET PATH"
175	* and the PATH line is
176	*
177	+ " SET PATH=C:\os2"
178	*
179	* the first space in the line is written into
180	* *ppStartOfLine.
181	*
182	*@@changed V0.9.0 [umoeller]: fixed bug in that this would also return something if only the first chars matched
183	*@@changed V0.9.0 [umoeller]: fixed bug which could cause character before pszSearchIn to be examined
184	*@@changed V0.9.7 (2001-01-15) [umoeller]: moved this here from stringh.c; renamed from strhFindKey
185	*@@changed V0.9.7 (2001-01-15) [umoeller]: now checking for tabs too
186	*@@changed V0.9.11 (2001-04-25) [umoeller]: this never found lines which had leading spaces, fixed
187	*@@changed V0.9.12 (2001-05-22) [umoeller]: added checks for key termination (SET SHELLHANDLESINC)
188	*/
189
190	PSZ csysFindKey(const char *pcszSearchIn, // in: text buffer to search
191	const char *pcszKey, // in: key to search for (e.g. "PATH=")
192	PSZ *ppStartOfLine, // out: start of line which contains pcszKey;
193	// ptr can be NULL
194	PBOOL pfIsAllUpperCase) // out: TRUE if key is completely in upper
195	// case; ptr can be NULL
196	{
197	const char *p = pcszSearchIn;
198	PSZ pReturn = NULL;
199	ULONG ulKeyLength = strlen(pcszKey);
200
201	BOOL fSearchKeyContainsEquals = (strchr(pcszKey, '=') != 0);
202
203	do
204	{
205	// find the key
206	// (on first loop, p is start of buffer;
207	// on subsequent loops, p is somewhere in bufer,
208	// if we've found the key somewhere else)
209	if (p = strhistr(p, pcszKey))
210	{
211	// make sure the key is at the beginning of a line
212	// by going backwards until we find a char != " "
213	const char *pStartOfLine = p;
214
215	// fixed this V0.9.11 (2001-04-25) [umoeller]
216	while ( (pStartOfLine > pcszSearchIn)
217	&& ( (*(pStartOfLine - 1) == ' ')
218	\|\| (*(pStartOfLine - 1) == '\t') // allow tabs too
219	)
220	)
221	--pStartOfLine;
222
223	// if we're at the beginning of a line or
224	// at the beginning of the buffer at all,
225	// let's go on
226	if ( (pStartOfLine == pcszSearchIn) // order fixed V0.9.0, Rdiger Ihle
227	\|\| (*(pStartOfLine - 1) == '\r')
228	\|\| (*(pStartOfLine - 1) == '\n')
229	)
230	{
231	// OK, we're at the start of a line:
232
233	// check the character AFTER the
234	// key if it's a space or '=';
235	// without this check, we'd find
236	// SET SHELL= if caller is really
237	// looking for SET SHELLHANDLESINC=,
238	// but only do this check if the caller
239	// doesn't have '=' in the search string
240	// already
241	// V0.9.12 (2001-05-22) [umoeller]
242	CHAR c = *(p + ulKeyLength);
243	if ( (fSearchKeyContainsEquals)
244	\|\| (c == ' ')
245	\|\| (c == '=')
246	\|\| (c == '\n')
247	\|\| (c == '\r')
248	\|\| (c == '\t')
249	)
250	{
251	// return address of key
252	pReturn = (PSZ)p;
253	// return start of line
254	if (ppStartOfLine)
255	*ppStartOfLine = (PSZ)pStartOfLine;
256
257	// test for all upper case?
258	if (pfIsAllUpperCase)
259	{
260	ULONG ul = 0;
261	*pfIsAllUpperCase = TRUE;
262
263	for (ul = 0;
264	ul < ulKeyLength;
265	ul++)
266	{
267	if (islower(*(p + ul)))
268	{
269	*pfIsAllUpperCase = FALSE;
270	break; // for
271	}
272	}
273	}
274
275	break; // do
276	} // else search next key
277	} // else search next key
278
279	p += ulKeyLength; // search on after this key
280	// now skipping ulKeyLength V0.9.12 (2001-05-22) [umoeller]
281	}
282	else
283	// nothing more found:
284	break;
285	} while ((!pReturn) && (p != NULL) && (p != pcszSearchIn));
286
287	return (pReturn);
288	}
289
290	/*
291	*@@ csysGetParameter:
292	* searches pcszSearchIn for the key pcszKey and gets
293	* its parameter.
294	*
295	* If found, it returns a pointer to the following
296	* characters in pcszSearchIn and, if pszCopyTo != NULL,
297	* copies the rest of the line to that buffer, of which
298	* cbCopyTo specified the size.
299	*
300	* If the key is not found, NULL is returned.
301	* String search is done by calling csysFindKey.
302	* This is useful for querying CONFIG.SYS settings.
303	*
304	* <B>Example:</B>
305	*
306	* For the CONFIG.SYS line
307	*
308	+ PAUSEONERROR=YES
309	*
310	* this would return "YES" if you searched for "PAUSEONERROR=".
311	*/
312
313	PSZ csysGetParameter(const char *pcszSearchIn, // in: text buffer to search
314	const char *pcszKey, // in: key to search for (e.g. "PATH=")
315	PSZ pszCopyTo, // out: key value
316	ULONG cbCopyTo) // out: sizeof(*pszCopyTo)
317	{
318	PSZ p = csysFindKey(pcszSearchIn, pcszKey, NULL, NULL),
319	prc = NULL;
320
321	if (p)
322	{
323	prc = p + strlen(pcszKey);
324	if (pszCopyTo)
325	{
326	// copy to pszCopyTo
327	ULONG cb;
328	PSZ pEOL = strhFindEOL(prc, &cb);
329	if (pEOL)
330	{
331	if (cb > cbCopyTo)
332	cb = cbCopyTo-1;
333	strhncpy0(pszCopyTo, prc, cb);
334	}
335	}
336	}
337
338	return (prc);
339	}
340
341	/*
342	*@@ csysSetParameter:
343	* searches *ppszBuf for the key pszKey; if found, it
344	* replaces the characters following this key up to the
345	* end of the line with pszParam. If pszKey is not found in
346	* *ppszBuf, it is appended to the file in a new line.
347	*
348	* If any changes are made, *ppszBuf is re-allocated.
349	*
350	* This function searches w/out case sensitivity.
351	*
352	* Returns a pointer to the new parameter inside the
353	* reallocated buffer, or NULL if the key was not found
354	* (and a new item was added).
355	*
356	* NOTE: This assumes that the file uses \n for line
357	* breaks only (not \r\n).
358	*
359	@@changed V0.9.0 [umoeller]: changed function prototype to PSZ ppszSearchIn
360	*@@changed V0.9.7 (2001-01-15) [umoeller]: fixed various bugs with the mem buffers
361	*/
362
363	PSZ csysSetParameter(PSZ* ppszBuf, // in: text buffer to search
364	const char *pcszKey, // in: key to search for (e.g. "PATH=")
365	const char *pcszNewParam, // in: new parameter to set for key
366	BOOL fRespectCase) // in: if TRUE, pszNewParam will
367	// be converted to upper case if the found key is
368	// in upper case also. pszNewParam should be in
369	// lower case if you use this.
370	{
371	BOOL fIsAllUpperCase = FALSE;
372	PSZ pKey = csysFindKey(*ppszBuf,
373	pcszKey,
374	NULL,
375	&fIsAllUpperCase),
376	pReturn = NULL;
377	if (pKey)
378	{
379	// key found in file:
380	// ULONG ulOfs;
381
382	// replace existing parameter
383	PSZ pOldParam = pKey + strlen(pcszKey);
384	// pOldParam now has the old parameter, which we
385	// will overwrite now; pOldParam points into *ppszBuf
386
387	if (pOldParam)
388	{
389	ULONG ulOldParamOfs = pOldParam - *ppszBuf;
390
391	PSZ pEOL = strhFindEOL(pOldParam, NULL);
392	// pEOL now has first end-of-line after the parameter
393
394	if (pEOL)
395	{
396	// char count to replace
397	ULONG ulToReplace = pEOL - pOldParam;
398
399	XSTRING strBuf,
400	strReplaceWith;
401
402	// ULONG ulOfs = 0;
403	// PSZ pszOldParamCopy = strhSubstr(pOldParam, pEOL);
404	/* (PSZ)malloc(cbOldParam+1);
405	strncpy(pszOldCopy, pOldParam, cbOldParam);
406	pszOldCopy[cbOldParam] = '\0'; */
407
408	xstrInitSet(&strBuf, *ppszBuf);
409	// this must not be freed!
410
411	xstrInitCopy(&strReplaceWith, pcszNewParam, 0);
412	// check for upper case desired?
413	if ((fRespectCase) && (fIsAllUpperCase))
414	strupr(strReplaceWith.psz);
415
416	xstrrpl(&strBuf,
417	ulOldParamOfs,
418	ulToReplace,
419	strReplaceWith.psz,
420	strReplaceWith.ulLength); // adjusted V0.9.11 (2001-04-22) [umoeller]
421
422	xstrClear(&strReplaceWith);
423
424	/* xstrFindReplaceC(&strBuf,
425	&ulOfs,
426	pszOldParamCopy,
427	pszNewParam); */
428
429	// free(pszOldParamCopy);
430
431	// replace output buffer
432	*ppszBuf = strBuf.psz;
433	// return ptr into that
434	pReturn = *ppszBuf + ulOldParamOfs;
435	}
436	}
437	}
438	else
439	{
440	// key not found: append to end of file
441	XSTRING strContents;
442	xstrInitCopy(&strContents, *ppszBuf, 0);
443	/* PSZ pszNew = (PSZ)malloc(strlen(*ppszBuf)
444	+ strlen(pcszKey)
445	+ strlen(pszNewParam)
446	+ 5); // 2 * \r\n + null byte
447	*/
448
449	xstrcatc(&strContents, '\n');
450	xstrcat(&strContents, pcszKey, 0);
451	xstrcat(&strContents, pcszNewParam, 0);
452	xstrcatc(&strContents, '\n');
453	/* sprintf(pszNew, "%s\r\n%s%s\r\n",
454	ppszBuf, pcszKey, pszNewParam); /
455
456	free(*ppszBuf);
457	*ppszBuf = strContents.psz;
458	}
459
460	return (pReturn);
461	}
462
463	/*
464	*@@ csysDeleteLine:
465	* this deletes the line in pszSearchIn which starts with
466	* the key pszKey. Returns TRUE if the line was found and
467	* deleted.
468	*
469	* This copies within pszSearchIn.
470	*
471	*@@changed V0.9.7 (2001-01-15) [umoeller]: fixed wrong beginning of line
472	*/
473
474	BOOL csysDeleteLine(PSZ pszSearchIn, // in: buffer to search
475	PSZ pszKey) // in: key to find
476	{
477	BOOL fIsAllUpperCase = FALSE;
478	PSZ pStartOfLine = NULL;
479	PSZ pKey = csysFindKey(pszSearchIn,
480	pszKey,
481	&pStartOfLine,
482	&fIsAllUpperCase);
483	BOOL brc = FALSE;
484
485	if (pKey)
486	{
487	PSZ pEOL = strhFindEOL(pKey, NULL);
488	// pEOL now has first end-of-line after the key
489	if (pEOL)
490	{
491	// go to first character after EOL
492	while ( (*pEOL)
493	&& ( (*pEOL == '\n')
494	\|\| (*pEOL == '\r')
495	)
496	)
497	pEOL++;
498
499	// delete line by overwriting it with
500	// the next line
501	strcpy(pStartOfLine,
502	pEOL);
503	}
504	else
505	{
506	// EOL not found: we must be at the end of the file
507	*pKey = '\0';
508	}
509	brc = TRUE;
510	}
511
512	return (brc);
513	}
514
515	/*
516	*@@ csysManipulate:
517	* makes a single CONFIG.SYS change according to the
518	* CONFIGMANIP which was passed in.
519	*
520	* If the manipulation succeeded, NO_ERROR is returned
521	* and pstrChanged receives a new string describing
522	* what was changed. This can be:
523	*
524	* -- "DLL xxx": deleted a line containing "xxx".
525	*
526	* -- "DLP xxx": deleted part of line.
527	*
528	* -- "NWL xxx": added an all new line.
529	*
530	* -- "NWP xxx": added a new part to an existing line.
531	*
532	* This has been moved here from WarpIN so that C programs
533	* can use these features as well.
534	*
535	* This returns:
536	*
537	* -- NO_ERROR: changed OK, or nothing happened.
538	*
539	* -- CFGERR_NOSEPARATOR: with CFGRPL_ADDLEFT or CFGRPL_ADDRIGHT
540	* modes, no "=" character was found.
541	*
542	* -- CFGERR_MANIPULATING: error in string handling. This should
543	* never happen, and if it does, it's a bug.
544	*
545	* Preconditions:
546	*
547	* -- This assumes that the line breaks are represented
548	* by \n ONLY. If *ppszContents has \r\n line breaks,
549	* they must be converted to pure \n first.
550	*/
551
552	APIRET csysManipulate(PSZ *ppszContents, // in/out: CONFIG.SYS text (reallocated)
553	PCONFIGMANIP pManip, // in: CONFIG.SYS manipulation instructions
554	PBOOL pfDirty, // out: set to TRUE if something was changed
555	PXSTRING pstrChanged) // out: new string describing changes (must be free'd)
556	{
557	APIRET arc = NO_ERROR;
558
559	PSZ pszCommand = 0,
560	pszArgNew = 0;
561	BOOL fIsAllUpperCase = FALSE;
562
563	// The CONFIG.SYS manipulation is a six-step process,
564	// depending on the data in the BSCfgSysManip instance.
565	// This is an outline what needs to be done when;
566	// the implementation follows below.
567
568	// 1) First find out if a line needs to be updated or deleted
569	// or if we only need to write a new line.
570	// This depends on BSCfgSysManip.iReplaceMode.
571	BOOL fFindLine = FALSE;
572
573	// 2) If we need to find a line, find the
574	// line and copy it into pszLineToUpdate.
575	// Set pInsertAt to the original line, if found.
576	// If not found, set fInsertWRTVertical to TRUE.
577	PSZ pInsertAt = 0;
578	// address of that line in original buffer if (fFindLine == TRUE) and
579	// found
580	BOOL fInsertWRTVertical = FALSE;
581	// TRUE means set a new pInsertAt depending on Manip.iVertical;
582	// this is set to TRUE if (fFindLine == FALSE) or line not found
583
584	// 3) If a line needs to be deleted, well, delete it then.
585	PSZ pLineToDelete = 0;
586	// pointer to start of original line (pLineToUpdate);
587	// points to character right after \n
588	PSZ pszDeletedLine = 0;
589	// copy of that line if deleted (this has the stuff between
590	// the EOL chars, not including those)
591
592	// 4) If (fInsertWRTVertical == TRUE), set pInsertAt to a position in
593	// the original buffer, depending on Manip.iVertical.
594
595	// 5) Compose a new line to be inserted at pInsertAt.
596	PSZ pszLineToInsert = 0;
597
598	// 6) Insert that line at pInsertAt.
599
600	/*
601	* Prepare data
602	*
603	*/
604
605	// First, check if the new-line string has a "=" char
606	PSZ pSep = strchr(pManip->pszNewLine, '=');
607	if (pSep)
608	{
609	// yes: separate in two strings
610	pszCommand = strhSubstr(pManip->pszNewLine, pSep);
611	pszArgNew = strdup(pSep+1);
612	}
613	else
614	{
615	// no:
616	pszCommand = strdup(pManip->pszNewLine);
617	pszArgNew = 0;
618	}
619
620	/*
621	* GO!!
622	*
623	*/
624
625	// **** 1): do we need to search for a line?
626	switch (pManip->iReplaceMode)
627	{
628	case CFGRPL_ADD:
629	fFindLine = FALSE;
630	fInsertWRTVertical = TRUE; // always find new position
631	break;
632
633	case CFGRPL_UNIQUE:
634	case CFGRPL_ADDLEFT:
635	case CFGRPL_ADDRIGHT:
636	case CFGRPL_REMOVELINE:
637	case CFGRPL_REMOVEPART:
638	fFindLine = TRUE; // search line first; this sets
639	// fInsertWRTVertical if not found
640	break;
641	}
642
643	// **** 2): search line, if needed
644	if (fFindLine)
645	{
646	PSZ pKeyFound = 0,
647	// address of key found
648	pStartOfLineWithKeyFound = 0,
649	// pointer to that line in original buffer; NULL if not found
650	pszSearch = *ppszContents;
651
652	do // while ((pManip->pszUniqueSearchString2) && (pszSearch));
653	{
654	pKeyFound = csysFindKey(pszSearch, // CONFIG.SYS text
655	pszCommand, // stuff to search for
656	&pStartOfLineWithKeyFound,
657	&fIsAllUpperCase);
658	// returns beginning of line
659
660	if (!pKeyFound)
661	break;
662	else
663	if (pManip->pszUniqueSearchString2)
664	{
665	// UNIQUE(xxx) mode:
666	// find end of line
667	PSZ pEOL = strhFindEOL(pKeyFound, NULL);
668
669	// find "="
670	PSZ p = strchr(pKeyFound, '=');
671	if (p && p < pEOL)
672	{
673	// find UNIQUE(xxx) substring in line
674	p = strhistr(p, pManip->pszUniqueSearchString2);
675	if (p && p < pEOL)
676	// found: OK, keep pLineToUpdate
677	break;
678	else
679	pKeyFound = NULL; // V0.9.7 (2001-01-15) [umoeller]
680	}
681
682	// else: search on
683	pszSearch = pEOL;
684	}
685	} while ((pManip->pszUniqueSearchString2) && (pszSearch));
686
687	if (pKeyFound)
688	{
689	// line found:
690	pLineToDelete = pStartOfLineWithKeyFound;
691	pInsertAt = pStartOfLineWithKeyFound;
692	}
693	else
694	// line not found:
695	// insert new line then,
696	// respecting the iVertical flag,
697	// unless we are in "remove" mode
698	if ( (pManip->iReplaceMode != CFGRPL_REMOVELINE)
699	&& (pManip->iReplaceMode != CFGRPL_REMOVEPART)
700	)
701	fInsertWRTVertical = TRUE;
702	}
703
704	// **** 3): delete original line (OK)
705	if (pLineToDelete)
706	{
707	// pLineToDelete is only != NULL if we searched and found a line above
708	// and points to the character right after \n;
709	// find end of this line
710	PSZ pEOL = strhFindEOL(pLineToDelete, NULL);
711
712	// make a copy of the line to be deleted;
713	// this might be needed later
714	pszDeletedLine = strhSubstr(pLineToDelete, pEOL);
715
716	// pEOL now points to the \n char or the terminating 0 byte;
717	// if not null byte, advance pointer
718	while (*pEOL == '\n')
719	pEOL++;
720
721	// overwrite beginning of line with next line;
722	// the buffers overlap, but this works
723	strcpy(pLineToDelete, pEOL);
724
725	// we've made changes...
726	*pfDirty = TRUE;
727	}
728
729	// **** 4):
730	if (fInsertWRTVertical)
731	{
732	// this is only TRUE if a) we didn't search for a line
733	// or b) we did search, but we didn't find a line
734	// (but never with CFGRPL_REMOVE* mode);
735	// we need to find a new vertical position in CONFIG.SYS then
736	// and set pInsertAt to the beginning of a line (after \n)
737	switch (pManip->iVertical)
738	{
739	case CFGVRT_BOTTOM:
740	// insert at the very bottom (default)
741	pInsertAt = ppszContents + strlen(ppszContents);
742	break;
743
744	case CFGVRT_TOP:
745	// insert at the very top
746	pInsertAt = *ppszContents;
747	break;
748
749	case CFGVRT_BEFORE:
750	{
751	// Manip.pszSearchString has the search string
752	// before whose line we must insert
753	PSZ pFound = strhistr(*ppszContents,
754	pManip->pszVerticalSearchString);
755	if (pFound)
756	{
757	// search string found:
758	// find beginning of line
759	while ( (pFound > *ppszContents)
760	&& (*pFound != '\n')
761	)
762	pFound--;
763
764	if (pFound > *ppszContents)
765	// we're on the \n char now:
766	pFound++;
767
768	pInsertAt = pFound;
769	}
770	else
771	// search string not found: insert at top then
772	pInsertAt = *ppszContents;
773	break; }
774
775	case CFGVRT_AFTER:
776	{
777	// Manip.pszSearchString has the search string
778	// after whose line we must insert
779	PSZ pFound = strhistr(*ppszContents, pManip->pszVerticalSearchString);
780	if (pFound)
781	{
782	// search string found:
783	// find end of line
784	pInsertAt = strhFindNextLine(pFound, NULL);
785	}
786	else
787	// search string not found: insert at bottom then
788	pInsertAt = ppszContents + strlen(ppszContents);
789	break; }
790	}
791	}
792
793	// **** 5): compose new line
794	switch (pManip->iReplaceMode)
795	{
796	case CFGRPL_ADD:
797	case CFGRPL_UNIQUE:
798	// that's easy, the new line is simply given
799	pszLineToInsert = strdup(pManip->pszNewLine);
800	break;
801
802	case CFGRPL_REMOVELINE:
803	// that's easy, just leave pszLineToInsert = 0;
804	break;
805
806	case CFGRPL_REMOVEPART:
807	if (pszDeletedLine)
808	{
809	// parse the line which we removed above,
810	// find the part which was to be removed,
811	// and set pszLineToInsert to the rest of that
812	PSZ pArgToDel = 0;
813	// find the subpart to look for
814	if ((pArgToDel = strhistr(pszDeletedLine, pszArgNew)))
815	{
816	ULONG ulOfs = 0;
817	// pArgToDel now has the position of the
818	// part to be deleted in the old part
819	pszLineToInsert = strdup(pszDeletedLine);
820	strhFindReplace(&pszLineToInsert,
821	&ulOfs,
822	pszArgNew, // search string
823	""); // replacement string
824	}
825	else
826	// subpart not found:
827	// reinsert the old line
828	pszLineToInsert = strdup(pszDeletedLine);
829	}
830	// else line to be deleted was not found: leave pszLineToInsert = 0;
831	break;
832
833	case CFGRPL_ADDLEFT:
834	case CFGRPL_ADDRIGHT:
835	// add something to the left or right of the existing
836	// argument:
837	// check if we found a line above
838	if (pszDeletedLine)
839	{
840	PSZ pszCommandOld = 0,
841	pszArgOld = 0;
842	// yes: split the existing line
843	pSep = strchr(pszDeletedLine, '=');
844	if (pSep)
845	{
846	// "=" found: separate in two strings
847	pszCommandOld = strhSubstr(pszDeletedLine, pSep);
848	pszArgOld = strdup(pSep+1);
849	}
850	else
851	{
852	// no "=" found: that's strange
853	/* throw(BSConfigExcpt(CFGEXCPT_NOSEPARATOR,
854	strdup(pszDeletedLine))); */
855	arc = CFGERR_NOSEPARATOR;
856	break;
857	}
858
859	if ((pszCommandOld) && (pszArgOld))
860	{
861	// does the new arg exist in old arg already?
862	if (strhistr(pszArgOld, pszArgNew) == 0)
863	{
864	// no: go!
865	ULONG cbCommandOld = strlen(pszCommandOld);
866	ULONG cbArgOld = strlen(pszArgOld);
867	ULONG cbArgNew = strlen(pszArgNew); // created at the very top
868
869	// compose new line
870	pszLineToInsert = (PSZ)malloc(cbCommandOld
871	+ cbArgOld
872	+ cbArgNew
873	+ 5);
874
875	if (pManip->iReplaceMode == CFGRPL_ADDLEFT)
876	// add new arg to the left:
877	sprintf(pszLineToInsert,
878	"%s=%s;%s",
879	pszCommandOld,
880	pszArgNew,
881	pszArgOld);
882	else
883	// add new arg to the right:
884	if (*(pszArgOld + cbArgOld - 1) == ';')
885	// old arg has terminating ";" already:
886	sprintf(pszLineToInsert,
887	"%s=%s%s",
888	pszCommandOld,
889	pszArgOld,
890	pszArgNew);
891	else
892	// we need to append a ";":
893	sprintf(pszLineToInsert,
894	"%s=%s;%s",
895	pszCommandOld,
896	pszArgOld,
897	pszArgNew);
898	} // end if (stristr(pszArgOld, pszArgNew) == 0)
899	else
900	// exists already:
901	// reinsert the line we deleted above
902	pszLineToInsert = strdup(pszDeletedLine);
903
904	free(pszCommandOld);
905	free(pszArgOld);
906	}
907	} // end if (pszDeletedLine)
908	else
909	// line was not found: add a new one then
910	// (the position has been determined above)
911	pszLineToInsert = strdup(pManip->pszNewLine);
912	break;
913	}
914
915	// **** 6): insert new line at pInsertAt
916	if ((pszLineToInsert) && (arc == NO_ERROR))
917	{
918	PSZ pszInsert2 = NULL;
919	PSZ pszNew = NULL;
920	ULONG cbInsert = strlen(pszLineToInsert);
921	BOOL fLineBreakNeeded = FALSE;
922
923	// check if the char before pInsertAt is EOL
924	if (pInsertAt > *ppszContents)
925	if (*(pInsertAt-1) != '\n')
926	fLineBreakNeeded = TRUE;
927
928	if (fLineBreakNeeded)
929	{
930	// not EOL (this might be the case if we're
931	// appending to the very bottom of CONFIG.SYS)
932	pszInsert2 = (PSZ)malloc(cbInsert + 5);
933	// insert an extra line break then
934	*pszInsert2 = '\n';
935	memcpy(pszInsert2 + 1, pszLineToInsert, cbInsert);
936	strcpy(pszInsert2 + cbInsert + 1, "\n");
937	}
938	else
939	{
940	// OK:
941	pszInsert2 = (PSZ)malloc(cbInsert + 3);
942	memcpy(pszInsert2, pszLineToInsert, cbInsert);
943	strcpy(pszInsert2 + cbInsert, "\n");
944	}
945
946	pszNew = strhins(*ppszContents, // source
947	(pInsertAt - *ppszContents), // offset
948	pszInsert2); // insertion string
949	if (pszNew)
950	{
951	free(pszInsert2);
952	free(*ppszContents);
953	*ppszContents = pszNew;
954
955	// we've made changes...
956	*pfDirty = TRUE;
957	}
958	else
959	arc = CFGERR_MANIPULATING;
960	}
961	else
962	if ( (pManip->iReplaceMode != CFGRPL_REMOVELINE)
963	&& (pManip->iReplaceMode != CFGRPL_REMOVEPART)
964	)
965	arc = CFGERR_MANIPULATING;
966
967	if (arc == NO_ERROR)
968	{
969	// finally, create log entries for Undo().
970	// This uses the first three characters of the
971	// each log entry to signify what happend:
972	// -- "DLL": deleted line
973	// -- "DLP": deleted part of line
974	// -- "NWL": added an all new line
975	// -- "NWP": added a new part to an existing line
976	// There may be several log entries per manipulator
977	// if a line was deleted and then re-inserted (i.e. updated).
978
979	if (pstrChanged)
980	{
981	switch (pManip->iReplaceMode)
982	{
983	case CFGRPL_UNIQUE:
984	if (pszDeletedLine)
985	{
986	// did we delete a line?
987	xstrcat(pstrChanged, "DLL ", 0);
988	xstrcat(pstrChanged, pszDeletedLine, 0);
989	xstrcatc(pstrChanged, '\n');
990	}
991
992	// no break, because we also added something
993	goto LABEL_CFGRPL_ADD ;
994	// VAC gives us warnings otherwise...
995
996	case CFGRPL_ADD:
997	LABEL_CFGRPL_ADD:
998	if (pszLineToInsert)
999	{
1000	// added a line:
1001	xstrcat(pstrChanged, "NWL ", 0);
1002	xstrcat(pstrChanged, pszLineToInsert, 0);
1003	xstrcatc(pstrChanged, '\n');
1004	}
1005	break;
1006
1007	case CFGRPL_ADDLEFT:
1008	case CFGRPL_ADDRIGHT:
1009	if (pszDeletedLine)
1010	{
1011	// a line was found and updated:
1012	// store the new part only
1013	xstrcat(pstrChanged, "NWP ", 0);
1014	xstrcat(pstrChanged, pManip->pszNewLine, 0);
1015	}
1016	else
1017	{
1018	xstrcat(pstrChanged, "NWL ", 0);
1019	xstrcat(pstrChanged, pszLineToInsert, 0);
1020	}
1021	xstrcatc(pstrChanged, '\n');
1022	break;
1023
1024	case CFGRPL_REMOVELINE:
1025	if (pszDeletedLine)
1026	{
1027	// did we delete a line?
1028	xstrcat(pstrChanged, "DLL ", 0);
1029	xstrcat(pstrChanged, pszDeletedLine, 0);
1030	xstrcatc(pstrChanged, '\n');
1031	}
1032	break;
1033
1034	case CFGRPL_REMOVEPART:
1035	if (pszDeletedLine)
1036	{
1037	// did we delete a part?
1038	xstrcat(pstrChanged, "DLP ", 0);
1039	xstrcat(pstrChanged, pManip->pszNewLine, 0);
1040	xstrcatc(pstrChanged, '\n');
1041	}
1042	break;
1043	}
1044	} // end if (pstrChanged)
1045	}
1046
1047	// clean up
1048	if (pszCommand)
1049	free(pszCommand);
1050	if (pszArgNew)
1051	free(pszArgNew);
1052	if (pszDeletedLine)
1053	free(pszDeletedLine);
1054	if (pszLineToInsert)
1055	free(pszLineToInsert);
1056
1057	return (arc);
1058	}
1059
1060	// testcase
1061
1062	/* int main()
1063	{
1064	PSZ pszContents = NULL;
1065	if (0 == csysLoadConfigSys(NULL, &pszContents))
1066	{
1067	CHAR szValue[1000];
1068	PSZ pszValue = csysGetParameter(pszContents,
1069	"IFS=",
1070	szValue,
1071	sizeof(szValue));
1072	if (pszValue)
1073	printf("Value: %s", szValue);
1074	}
1075
1076	return (0);
1077	} */

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