source: trunk/binutils/intl/dcgettext.c@ 3158

Last change on this file since 3158 was 610, checked in by bird, 22 years ago

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1/* Implementation of the dcgettext(3) function.
2 Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
17
18#ifdef HAVE_CONFIG_H
19# include <config.h>
20#endif
21
22#include <sys/types.h>
23
24#ifdef __GNUC__
25# define alloca __builtin_alloca
26# define HAVE_ALLOCA 1
27#else
28# if defined HAVE_ALLOCA_H || defined _LIBC
29# include <alloca.h>
30# else
31# ifdef _AIX
32 #pragma alloca
33# else
34# ifndef alloca
35char *alloca ();
36# endif
37# endif
38# endif
39#endif
40
41#include <errno.h>
42#ifndef errno
43extern int errno;
44#endif
45#ifndef __set_errno
46# define __set_errno(val) errno = (val)
47#endif
48
49#if defined STDC_HEADERS || defined _LIBC
50# include <stdlib.h>
51#else
52char *getenv ();
53# ifdef HAVE_MALLOC_H
54# include <malloc.h>
55# else
56void free ();
57# endif
58#endif
59
60#if defined HAVE_STRING_H || defined _LIBC
61# ifndef _GNU_SOURCE
62# define _GNU_SOURCE 1
63# endif
64# include <string.h>
65#else
66# include <strings.h>
67#endif
68#if !HAVE_STRCHR && !defined _LIBC
69# ifndef strchr
70# define strchr index
71# endif
72#endif
73
74#if defined HAVE_UNISTD_H || defined _LIBC
75# include <unistd.h>
76#endif
77
78#include "gettext.h"
79#include "gettextP.h"
80#ifdef _LIBC
81# include <libintl.h>
82#else
83# include "libgettext.h"
84#endif
85#include "hash-string.h"
86
87/* @@ end of prolog @@ */
88
89#ifdef _LIBC
90/* Rename the non ANSI C functions. This is required by the standard
91 because some ANSI C functions will require linking with this object
92 file and the name space must not be polluted. */
93# define getcwd __getcwd
94# ifndef stpcpy
95# define stpcpy __stpcpy
96# endif
97#else
98# if !defined HAVE_GETCWD
99char *getwd ();
100# define getcwd(buf, max) getwd (buf)
101# else
102char *getcwd ();
103# endif
104# ifndef HAVE_STPCPY
105static char *stpcpy PARAMS ((char *dest, const char *src));
106# endif
107#endif
108
109/* Amount to increase buffer size by in each try. */
110#define PATH_INCR 32
111
112/* The following is from pathmax.h. */
113/* Non-POSIX BSD systems might have gcc's limits.h, which doesn't define
114 PATH_MAX but might cause redefinition warnings when sys/param.h is
115 later included (as on MORE/BSD 4.3). */
116#if defined(_POSIX_VERSION) || (defined(HAVE_LIMITS_H) && !defined(__GNUC__))
117# include <limits.h>
118#endif
119
120#ifndef _POSIX_PATH_MAX
121# define _POSIX_PATH_MAX 255
122#endif
123
124#if !defined(PATH_MAX) && defined(_PC_PATH_MAX)
125# define PATH_MAX (pathconf ("/", _PC_PATH_MAX) < 1 ? 1024 : pathconf ("/", _PC_PATH_MAX))
126#endif
127
128/* Don't include sys/param.h if it already has been. */
129#if defined(HAVE_SYS_PARAM_H) && !defined(PATH_MAX) && !defined(MAXPATHLEN)
130# include <sys/param.h>
131#endif
132
133#if !defined(PATH_MAX) && defined(MAXPATHLEN)
134# define PATH_MAX MAXPATHLEN
135#endif
136
137#ifndef PATH_MAX
138# define PATH_MAX _POSIX_PATH_MAX
139#endif
140
141/* XPG3 defines the result of `setlocale (category, NULL)' as:
142 ``Directs `setlocale()' to query `category' and return the current
143 setting of `local'.''
144 However it does not specify the exact format. And even worse: POSIX
145 defines this not at all. So we can use this feature only on selected
146 system (e.g. those using GNU C Library). */
147#ifdef _LIBC
148# define HAVE_LOCALE_NULL
149#endif
150
151/* Name of the default domain used for gettext(3) prior any call to
152 textdomain(3). The default value for this is "messages". */
153const char _nl_default_default_domain[] = "messages";
154
155/* Value used as the default domain for gettext(3). */
156const char *_nl_current_default_domain = _nl_default_default_domain;
157
158/* Contains the default location of the message catalogs. */
159const char _nl_default_dirname[] = GNULOCALEDIR;
160
161/* List with bindings of specific domains created by bindtextdomain()
162 calls. */
163struct binding *_nl_domain_bindings;
164
165/* Prototypes for local functions. */
166static char *find_msg PARAMS ((struct loaded_l10nfile *domain_file,
167 const char *msgid)) internal_function;
168static const char *category_to_name PARAMS ((int category)) internal_function;
169static const char *guess_category_value PARAMS ((int category,
170 const char *categoryname))
171 internal_function;
172
173
174/* For those loosing systems which don't have `alloca' we have to add
175 some additional code emulating it. */
176#ifdef HAVE_ALLOCA
177/* Nothing has to be done. */
178# define ADD_BLOCK(list, address) /* nothing */
179# define FREE_BLOCKS(list) /* nothing */
180#else
181struct block_list
182{
183 void *address;
184 struct block_list *next;
185};
186# define ADD_BLOCK(list, addr) \
187 do { \
188 struct block_list *newp = (struct block_list *) malloc (sizeof (*newp)); \
189 /* If we cannot get a free block we cannot add the new element to \
190 the list. */ \
191 if (newp != NULL) { \
192 newp->address = (addr); \
193 newp->next = (list); \
194 (list) = newp; \
195 } \
196 } while (0)
197# define FREE_BLOCKS(list) \
198 do { \
199 while (list != NULL) { \
200 struct block_list *old = list; \
201 list = list->next; \
202 free (old); \
203 } \
204 } while (0)
205# undef alloca
206# define alloca(size) (malloc (size))
207#endif /* have alloca */
208
209
210/* Names for the libintl functions are a problem. They must not clash
211 with existing names and they should follow ANSI C. But this source
212 code is also used in GNU C Library where the names have a __
213 prefix. So we have to make a difference here. */
214#ifdef _LIBC
215# define DCGETTEXT __dcgettext
216#else
217# define DCGETTEXT dcgettext__
218#endif
219
220/* Look up MSGID in the DOMAINNAME message catalog for the current CATEGORY
221 locale. */
222char *
223DCGETTEXT (domainname, msgid, category)
224 const char *domainname;
225 const char *msgid;
226 int category;
227{
228#ifndef HAVE_ALLOCA
229 struct block_list *block_list = NULL;
230#endif
231 struct loaded_l10nfile *domain;
232 struct binding *binding;
233 const char *categoryname;
234 const char *categoryvalue;
235 char *dirname, *xdomainname;
236 char *single_locale;
237 char *retval;
238 int saved_errno = errno;
239
240 /* If no real MSGID is given return NULL. */
241 if (msgid == NULL)
242 return NULL;
243
244 /* If DOMAINNAME is NULL, we are interested in the default domain. If
245 CATEGORY is not LC_MESSAGES this might not make much sense but the
246 defintion left this undefined. */
247 if (domainname == NULL)
248 domainname = _nl_current_default_domain;
249
250 /* First find matching binding. */
251 for (binding = _nl_domain_bindings; binding != NULL; binding = binding->next)
252 {
253 int compare = strcmp (domainname, binding->domainname);
254 if (compare == 0)
255 /* We found it! */
256 break;
257 if (compare < 0)
258 {
259 /* It is not in the list. */
260 binding = NULL;
261 break;
262 }
263 }
264
265 if (binding == NULL)
266 dirname = (char *) _nl_default_dirname;
267 else if (binding->dirname[0] == '/')
268 dirname = binding->dirname;
269 else
270 {
271 /* We have a relative path. Make it absolute now. */
272 size_t dirname_len = strlen (binding->dirname) + 1;
273 size_t path_max;
274 char *ret;
275
276 path_max = (unsigned) PATH_MAX;
277 path_max += 2; /* The getcwd docs say to do this. */
278
279 dirname = (char *) alloca (path_max + dirname_len);
280 ADD_BLOCK (block_list, dirname);
281
282 __set_errno (0);
283 while ((ret = getcwd (dirname, path_max)) == NULL && errno == ERANGE)
284 {
285 path_max += PATH_INCR;
286 dirname = (char *) alloca (path_max + dirname_len);
287 ADD_BLOCK (block_list, dirname);
288 __set_errno (0);
289 }
290
291 if (ret == NULL)
292 {
293 /* We cannot get the current working directory. Don't signal an
294 error but simply return the default string. */
295 FREE_BLOCKS (block_list);
296 __set_errno (saved_errno);
297 return (char *) msgid;
298 }
299
300 stpcpy (stpcpy (strchr (dirname, '\0'), "/"), binding->dirname);
301 }
302
303 /* Now determine the symbolic name of CATEGORY and its value. */
304 categoryname = category_to_name (category);
305 categoryvalue = guess_category_value (category, categoryname);
306
307 xdomainname = (char *) alloca (strlen (categoryname)
308 + strlen (domainname) + 5);
309 ADD_BLOCK (block_list, xdomainname);
310
311 stpcpy (stpcpy (stpcpy (stpcpy (xdomainname, categoryname), "/"),
312 domainname),
313 ".mo");
314
315 /* Creating working area. */
316 single_locale = (char *) alloca (strlen (categoryvalue) + 1);
317 ADD_BLOCK (block_list, single_locale);
318
319
320 /* Search for the given string. This is a loop because we perhaps
321 got an ordered list of languages to consider for th translation. */
322 while (1)
323 {
324 /* Make CATEGORYVALUE point to the next element of the list. */
325 while (categoryvalue[0] != '\0' && categoryvalue[0] == ':')
326 ++categoryvalue;
327 if (categoryvalue[0] == '\0')
328 {
329 /* The whole contents of CATEGORYVALUE has been searched but
330 no valid entry has been found. We solve this situation
331 by implicitly appending a "C" entry, i.e. no translation
332 will take place. */
333 single_locale[0] = 'C';
334 single_locale[1] = '\0';
335 }
336 else
337 {
338 char *cp = single_locale;
339 while (categoryvalue[0] != '\0' && categoryvalue[0] != ':')
340 *cp++ = *categoryvalue++;
341 *cp = '\0';
342 }
343
344 /* If the current locale value is C (or POSIX) we don't load a
345 domain. Return the MSGID. */
346 if (strcmp (single_locale, "C") == 0
347 || strcmp (single_locale, "POSIX") == 0)
348 {
349 FREE_BLOCKS (block_list);
350 __set_errno (saved_errno);
351 return (char *) msgid;
352 }
353
354
355 /* Find structure describing the message catalog matching the
356 DOMAINNAME and CATEGORY. */
357 domain = _nl_find_domain (dirname, single_locale, xdomainname);
358
359 if (domain != NULL)
360 {
361 retval = find_msg (domain, msgid);
362
363 if (retval == NULL)
364 {
365 int cnt;
366
367 for (cnt = 0; domain->successor[cnt] != NULL; ++cnt)
368 {
369 retval = find_msg (domain->successor[cnt], msgid);
370
371 if (retval != NULL)
372 break;
373 }
374 }
375
376 if (retval != NULL)
377 {
378 FREE_BLOCKS (block_list);
379 __set_errno (saved_errno);
380 return retval;
381 }
382 }
383 }
384 /* NOTREACHED */
385}
386
387#ifdef _LIBC
388/* Alias for function name in GNU C Library. */
389weak_alias (__dcgettext, dcgettext);
390#endif
391
392
393static char *
394internal_function
395find_msg (domain_file, msgid)
396 struct loaded_l10nfile *domain_file;
397 const char *msgid;
398{
399 size_t top, act, bottom;
400 struct loaded_domain *domain;
401
402 if (domain_file->decided == 0)
403 _nl_load_domain (domain_file);
404
405 if (domain_file->data == NULL)
406 return NULL;
407
408 domain = (struct loaded_domain *) domain_file->data;
409
410 /* Locate the MSGID and its translation. */
411 if (domain->hash_size > 2 && domain->hash_tab != NULL)
412 {
413 /* Use the hashing table. */
414 nls_uint32 len = strlen (msgid);
415 nls_uint32 hash_val = hash_string (msgid);
416 nls_uint32 idx = hash_val % domain->hash_size;
417 nls_uint32 incr = 1 + (hash_val % (domain->hash_size - 2));
418 nls_uint32 nstr = W (domain->must_swap, domain->hash_tab[idx]);
419
420 if (nstr == 0)
421 /* Hash table entry is empty. */
422 return NULL;
423
424 if (W (domain->must_swap, domain->orig_tab[nstr - 1].length) == len
425 && strcmp (msgid,
426 domain->data + W (domain->must_swap,
427 domain->orig_tab[nstr - 1].offset)) == 0)
428 return (char *) domain->data + W (domain->must_swap,
429 domain->trans_tab[nstr - 1].offset);
430
431 while (1)
432 {
433 if (idx >= domain->hash_size - incr)
434 idx -= domain->hash_size - incr;
435 else
436 idx += incr;
437
438 nstr = W (domain->must_swap, domain->hash_tab[idx]);
439 if (nstr == 0)
440 /* Hash table entry is empty. */
441 return NULL;
442
443 if (W (domain->must_swap, domain->orig_tab[nstr - 1].length) == len
444 && strcmp (msgid,
445 domain->data + W (domain->must_swap,
446 domain->orig_tab[nstr - 1].offset))
447 == 0)
448 return (char *) domain->data
449 + W (domain->must_swap, domain->trans_tab[nstr - 1].offset);
450 }
451 /* NOTREACHED */
452 }
453
454 /* Now we try the default method: binary search in the sorted
455 array of messages. */
456 bottom = 0;
457 top = domain->nstrings;
458 while (bottom < top)
459 {
460 int cmp_val;
461
462 act = (bottom + top) / 2;
463 cmp_val = strcmp (msgid, domain->data
464 + W (domain->must_swap,
465 domain->orig_tab[act].offset));
466 if (cmp_val < 0)
467 top = act;
468 else if (cmp_val > 0)
469 bottom = act + 1;
470 else
471 break;
472 }
473
474 /* If an translation is found return this. */
475 return bottom >= top ? NULL : (char *) domain->data
476 + W (domain->must_swap,
477 domain->trans_tab[act].offset);
478}
479
480
481/* Return string representation of locale CATEGORY. */
482static const char *
483internal_function
484category_to_name (category)
485 int category;
486{
487 const char *retval;
488
489 switch (category)
490 {
491#ifdef LC_COLLATE
492 case LC_COLLATE:
493 retval = "LC_COLLATE";
494 break;
495#endif
496#ifdef LC_CTYPE
497 case LC_CTYPE:
498 retval = "LC_CTYPE";
499 break;
500#endif
501#ifdef LC_MONETARY
502 case LC_MONETARY:
503 retval = "LC_MONETARY";
504 break;
505#endif
506#ifdef LC_NUMERIC
507 case LC_NUMERIC:
508 retval = "LC_NUMERIC";
509 break;
510#endif
511#ifdef LC_TIME
512 case LC_TIME:
513 retval = "LC_TIME";
514 break;
515#endif
516#ifdef LC_MESSAGES
517 case LC_MESSAGES:
518 retval = "LC_MESSAGES";
519 break;
520#endif
521#ifdef LC_RESPONSE
522 case LC_RESPONSE:
523 retval = "LC_RESPONSE";
524 break;
525#endif
526#ifdef LC_ALL
527 case LC_ALL:
528 /* This might not make sense but is perhaps better than any other
529 value. */
530 retval = "LC_ALL";
531 break;
532#endif
533 default:
534 /* If you have a better idea for a default value let me know. */
535 retval = "LC_XXX";
536 }
537
538 return retval;
539}
540
541/* Guess value of current locale from value of the environment variables. */
542static const char *
543internal_function
544guess_category_value (category, categoryname)
545 int category;
546 const char *categoryname;
547{
548 const char *retval;
549
550 /* The highest priority value is the `LANGUAGE' environment
551 variable. This is a GNU extension. */
552 retval = getenv ("LANGUAGE");
553 if (retval != NULL && retval[0] != '\0')
554 return retval;
555
556 /* `LANGUAGE' is not set. So we have to proceed with the POSIX
557 methods of looking to `LC_ALL', `LC_xxx', and `LANG'. On some
558 systems this can be done by the `setlocale' function itself. */
559#if defined HAVE_SETLOCALE && defined HAVE_LC_MESSAGES && defined HAVE_LOCALE_NULL
560 return setlocale (category, NULL);
561#else
562 /* Setting of LC_ALL overwrites all other. */
563 retval = getenv ("LC_ALL");
564 if (retval != NULL && retval[0] != '\0')
565 return retval;
566
567 /* Next comes the name of the desired category. */
568 retval = getenv (categoryname);
569 if (retval != NULL && retval[0] != '\0')
570 return retval;
571
572 /* Last possibility is the LANG environment variable. */
573 retval = getenv ("LANG");
574 if (retval != NULL && retval[0] != '\0')
575 return retval;
576
577 /* We use C as the default domain. POSIX says this is implementation
578 defined. */
579 return "C";
580#endif
581}
582
583/* @@ begin of epilog @@ */
584
585/* We don't want libintl.a to depend on any other library. So we
586 avoid the non-standard function stpcpy. In GNU C Library this
587 function is available, though. Also allow the symbol HAVE_STPCPY
588 to be defined. */
589#if !_LIBC && !HAVE_STPCPY
590static char *
591stpcpy (dest, src)
592 char *dest;
593 const char *src;
594{
595 while ((*dest++ = *src++) != '\0')
596 /* Do nothing. */ ;
597 return dest - 1;
598}
599#endif
600
601
602#ifdef _LIBC
603/* If we want to free all resources we have to do some work at
604 program's end. */
605static void __attribute__ ((unused))
606free_mem (void)
607{
608 struct binding *runp;
609
610 for (runp = _nl_domain_bindings; runp != NULL; runp = runp->next)
611 {
612 free (runp->domainname);
613 if (runp->dirname != _nl_default_dirname)
614 /* Yes, this is a pointer comparison. */
615 free (runp->dirname);
616 }
617
618 if (_nl_current_default_domain != _nl_default_default_domain)
619 /* Yes, again a pointer comparison. */
620 free ((char *) _nl_current_default_domain);
621}
622
623text_set_element (__libc_subfreeres, free_mem);
624#endif
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