Annotation of embedaddon/lrzsz/intl/dcgettext.c, revision 1.1.1.1
1.1 misho 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
35: char *alloca ();
36: # endif
37: # endif
38: # endif
39: #endif
40:
41: #include <errno.h>
42: #ifndef errno
43: extern 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
52: char *getenv ();
53: # ifdef HAVE_MALLOC_H
54: # include <malloc.h>
55: # else
56: void 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
97: char *getwd ();
98: # define getcwd(buf, max) getwd (buf)
99: # else
100: char *getcwd ();
101: # endif
102: # ifndef HAVE_STPCPY
103: static 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". */
151: const char _nl_default_default_domain[] = "messages";
152:
153: /* Value used as the default domain for gettext(3). */
154: const char *_nl_current_default_domain = _nl_default_default_domain;
155:
156: /* Contains the default location of the message catalogs. */
157: const char _nl_default_dirname[] = GNULOCALEDIR;
158:
159: /* List with bindings of specific domains created by bindtextdomain()
160: calls. */
161: struct binding *_nl_domain_bindings;
162:
163: /* Prototypes for local functions. */
164: static char *find_msg PARAMS ((struct loaded_l10nfile *domain_file,
165: const char *msgid));
166: static const char *category_to_name PARAMS ((int category));
167: static 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
178: struct 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. */
219: char *
220: DCGETTEXT (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. */
386: weak_alias (__dcgettext, dcgettext);
387: #endif
388:
389:
390: static char *
391: find_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. */
478: static const char *
479: category_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. */
537: static const char *
538: guess_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
584: static char *
585: stpcpy (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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