source: trunk/src/binutils/intl/dcgettext.c@ 106

Last change on this file since 106 was 10, checked in by bird, 22 years ago

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