dcgettext.c
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上传日期:2007-01-04
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文件大小:16k
- /* Implementation of the dcgettext(3) function.
- Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
- #ifdef HAVE_CONFIG_H
- # include <config.h>
- #endif
- #include <sys/types.h>
- #ifdef __GNUC__
- # define alloca __builtin_alloca
- # define HAVE_ALLOCA 1
- #else
- # if defined HAVE_ALLOCA_H || defined _LIBC
- # include <alloca.h>
- # else
- # ifdef _AIX
- #pragma alloca
- # else
- # ifndef alloca
- char *alloca ();
- # endif
- # endif
- # endif
- #endif
- #include <errno.h>
- #ifndef errno
- extern int errno;
- #endif
- #ifndef __set_errno
- # define __set_errno(val) errno = (val)
- #endif
- #if defined STDC_HEADERS || defined _LIBC
- # include <stdlib.h>
- #else
- char *getenv ();
- # ifdef HAVE_MALLOC_H
- # include <malloc.h>
- # else
- void free ();
- # endif
- #endif
- #if defined HAVE_STRING_H || defined _LIBC
- # ifndef _GNU_SOURCE
- # define _GNU_SOURCE 1
- # endif
- # include <string.h>
- #else
- # include <strings.h>
- #endif
- #if !HAVE_STRCHR && !defined _LIBC
- # ifndef strchr
- # define strchr index
- # endif
- #endif
- #if defined HAVE_UNISTD_H || defined _LIBC
- # include <unistd.h>
- #endif
- #include "gettext.h"
- #include "gettextP.h"
- #ifdef _LIBC
- # include <libintl.h>
- #else
- # include "libgettext.h"
- #endif
- #include "hash-string.h"
- /* @@ end of prolog @@ */
- #ifdef _LIBC
- /* Rename the non ANSI C functions. This is required by the standard
- because some ANSI C functions will require linking with this object
- file and the name space must not be polluted. */
- # define getcwd __getcwd
- # ifndef stpcpy
- # define stpcpy __stpcpy
- # endif
- #else
- # if !defined HAVE_GETCWD
- char *getwd ();
- # define getcwd(buf, max) getwd (buf)
- # else
- char *getcwd ();
- # endif
- # ifndef HAVE_STPCPY
- static char *stpcpy PARAMS ((char *dest, const char *src));
- # endif
- #endif
- /* Amount to increase buffer size by in each try. */
- #define PATH_INCR 32
- /* The following is from pathmax.h. */
- /* Non-POSIX BSD systems might have gcc's limits.h, which doesn't define
- PATH_MAX but might cause redefinition warnings when sys/param.h is
- later included (as on MORE/BSD 4.3). */
- #if defined(_POSIX_VERSION) || (defined(HAVE_LIMITS_H) && !defined(__GNUC__))
- # include <limits.h>
- #endif
- #ifndef _POSIX_PATH_MAX
- # define _POSIX_PATH_MAX 255
- #endif
- #if !defined(PATH_MAX) && defined(_PC_PATH_MAX)
- # define PATH_MAX (pathconf ("/", _PC_PATH_MAX) < 1 ? 1024 : pathconf ("/", _PC_PATH_MAX))
- #endif
- /* Don't include sys/param.h if it already has been. */
- #if defined(HAVE_SYS_PARAM_H) && !defined(PATH_MAX) && !defined(MAXPATHLEN)
- # include <sys/param.h>
- #endif
- #if !defined(PATH_MAX) && defined(MAXPATHLEN)
- # define PATH_MAX MAXPATHLEN
- #endif
- #ifndef PATH_MAX
- # define PATH_MAX _POSIX_PATH_MAX
- #endif
- /* XPG3 defines the result of `setlocale (category, NULL)' as:
- ``Directs `setlocale()' to query `category' and return the current
- setting of `local'.''
- However it does not specify the exact format. And even worse: POSIX
- defines this not at all. So we can use this feature only on selected
- system (e.g. those using GNU C Library). */
- #ifdef _LIBC
- # define HAVE_LOCALE_NULL
- #endif
- /* Name of the default domain used for gettext(3) prior any call to
- textdomain(3). The default value for this is "messages". */
- const char _nl_default_default_domain[] = "messages";
- /* Value used as the default domain for gettext(3). */
- const char *_nl_current_default_domain = _nl_default_default_domain;
- /* Contains the default location of the message catalogs. */
- const char _nl_default_dirname[] = GNULOCALEDIR;
- /* List with bindings of specific domains created by bindtextdomain()
- calls. */
- struct binding *_nl_domain_bindings;
- /* Prototypes for local functions. */
- static char *find_msg PARAMS ((struct loaded_l10nfile *domain_file,
- const char *msgid)) internal_function;
- static const char *category_to_name PARAMS ((int category)) internal_function;
- static const char *guess_category_value PARAMS ((int category,
- const char *categoryname))
- internal_function;
- /* For those loosing systems which don't have `alloca' we have to add
- some additional code emulating it. */
- #ifdef HAVE_ALLOCA
- /* Nothing has to be done. */
- # define ADD_BLOCK(list, address) /* nothing */
- # define FREE_BLOCKS(list) /* nothing */
- #else
- struct block_list
- {
- void *address;
- struct block_list *next;
- };
- # define ADD_BLOCK(list, addr)
- do {
- struct block_list *newp = (struct block_list *) malloc (sizeof (*newp));
- /* If we cannot get a free block we cannot add the new element to
- the list. */
- if (newp != NULL) {
- newp->address = (addr);
- newp->next = (list);
- (list) = newp;
- }
- } while (0)
- # define FREE_BLOCKS(list)
- do {
- while (list != NULL) {
- struct block_list *old = list;
- list = list->next;
- free (old);
- }
- } while (0)
- # undef alloca
- # define alloca(size) (malloc (size))
- #endif /* have alloca */
- /* Names for the libintl functions are a problem. They must not clash
- with existing names and they should follow ANSI C. But this source
- code is also used in GNU C Library where the names have a __
- prefix. So we have to make a difference here. */
- #ifdef _LIBC
- # define DCGETTEXT __dcgettext
- #else
- # define DCGETTEXT dcgettext__
- #endif
- /* Look up MSGID in the DOMAINNAME message catalog for the current CATEGORY
- locale. */
- char *
- DCGETTEXT (domainname, msgid, category)
- const char *domainname;
- const char *msgid;
- int category;
- {
- #ifndef HAVE_ALLOCA
- struct block_list *block_list = NULL;
- #endif
- struct loaded_l10nfile *domain;
- struct binding *binding;
- const char *categoryname;
- const char *categoryvalue;
- char *dirname, *xdomainname;
- char *single_locale;
- char *retval;
- int saved_errno = errno;
- /* If no real MSGID is given return NULL. */
- if (msgid == NULL)
- return NULL;
- /* If DOMAINNAME is NULL, we are interested in the default domain. If
- CATEGORY is not LC_MESSAGES this might not make much sense but the
- defintion left this undefined. */
- if (domainname == NULL)
- domainname = _nl_current_default_domain;
- /* First find matching binding. */
- for (binding = _nl_domain_bindings; binding != NULL; binding = binding->next)
- {
- int compare = strcmp (domainname, binding->domainname);
- if (compare == 0)
- /* We found it! */
- break;
- if (compare < 0)
- {
- /* It is not in the list. */
- binding = NULL;
- break;
- }
- }
- if (binding == NULL)
- dirname = (char *) _nl_default_dirname;
- else if (binding->dirname[0] == '/')
- dirname = binding->dirname;
- else
- {
- /* We have a relative path. Make it absolute now. */
- size_t dirname_len = strlen (binding->dirname) + 1;
- size_t path_max;
- char *ret;
- path_max = (unsigned) PATH_MAX;
- path_max += 2; /* The getcwd docs say to do this. */
- dirname = (char *) alloca (path_max + dirname_len);
- ADD_BLOCK (block_list, dirname);
- __set_errno (0);
- while ((ret = getcwd (dirname, path_max)) == NULL && errno == ERANGE)
- {
- path_max += PATH_INCR;
- dirname = (char *) alloca (path_max + dirname_len);
- ADD_BLOCK (block_list, dirname);
- __set_errno (0);
- }
- if (ret == NULL)
- {
- /* We cannot get the current working directory. Don't signal an
- error but simply return the default string. */
- FREE_BLOCKS (block_list);
- __set_errno (saved_errno);
- return (char *) msgid;
- }
- stpcpy (stpcpy (strchr (dirname, ' '), "/"), binding->dirname);
- }
- /* Now determine the symbolic name of CATEGORY and its value. */
- categoryname = category_to_name (category);
- categoryvalue = guess_category_value (category, categoryname);
- xdomainname = (char *) alloca (strlen (categoryname)
- + strlen (domainname) + 5);
- ADD_BLOCK (block_list, xdomainname);
- stpcpy (stpcpy (stpcpy (stpcpy (xdomainname, categoryname), "/"),
- domainname),
- ".mo");
- /* Creating working area. */
- single_locale = (char *) alloca (strlen (categoryvalue) + 1);
- ADD_BLOCK (block_list, single_locale);
- /* Search for the given string. This is a loop because we perhaps
- got an ordered list of languages to consider for th translation. */
- while (1)
- {
- /* Make CATEGORYVALUE point to the next element of the list. */
- while (categoryvalue[0] != ' ' && categoryvalue[0] == ':')
- ++categoryvalue;
- if (categoryvalue[0] == ' ')
- {
- /* The whole contents of CATEGORYVALUE has been searched but
- no valid entry has been found. We solve this situation
- by implicitly appending a "C" entry, i.e. no translation
- will take place. */
- single_locale[0] = 'C';
- single_locale[1] = ' ';
- }
- else
- {
- char *cp = single_locale;
- while (categoryvalue[0] != ' ' && categoryvalue[0] != ':')
- *cp++ = *categoryvalue++;
- *cp = ' ';
- }
- /* If the current locale value is C (or POSIX) we don't load a
- domain. Return the MSGID. */
- if (strcmp (single_locale, "C") == 0
- || strcmp (single_locale, "POSIX") == 0)
- {
- FREE_BLOCKS (block_list);
- __set_errno (saved_errno);
- return (char *) msgid;
- }
- /* Find structure describing the message catalog matching the
- DOMAINNAME and CATEGORY. */
- domain = _nl_find_domain (dirname, single_locale, xdomainname);
- if (domain != NULL)
- {
- retval = find_msg (domain, msgid);
- if (retval == NULL)
- {
- int cnt;
- for (cnt = 0; domain->successor[cnt] != NULL; ++cnt)
- {
- retval = find_msg (domain->successor[cnt], msgid);
- if (retval != NULL)
- break;
- }
- }
- if (retval != NULL)
- {
- FREE_BLOCKS (block_list);
- __set_errno (saved_errno);
- return retval;
- }
- }
- }
- /* NOTREACHED */
- }
- #ifdef _LIBC
- /* Alias for function name in GNU C Library. */
- weak_alias (__dcgettext, dcgettext);
- #endif
- static char *
- internal_function
- find_msg (domain_file, msgid)
- struct loaded_l10nfile *domain_file;
- const char *msgid;
- {
- size_t top, act, bottom;
- struct loaded_domain *domain;
- if (domain_file->decided == 0)
- _nl_load_domain (domain_file);
- if (domain_file->data == NULL)
- return NULL;
- domain = (struct loaded_domain *) domain_file->data;
- /* Locate the MSGID and its translation. */
- if (domain->hash_size > 2 && domain->hash_tab != NULL)
- {
- /* Use the hashing table. */
- nls_uint32 len = strlen (msgid);
- nls_uint32 hash_val = hash_string (msgid);
- nls_uint32 idx = hash_val % domain->hash_size;
- nls_uint32 incr = 1 + (hash_val % (domain->hash_size - 2));
- nls_uint32 nstr = W (domain->must_swap, domain->hash_tab[idx]);
- if (nstr == 0)
- /* Hash table entry is empty. */
- return NULL;
- if (W (domain->must_swap, domain->orig_tab[nstr - 1].length) == len
- && strcmp (msgid,
- domain->data + W (domain->must_swap,
- domain->orig_tab[nstr - 1].offset)) == 0)
- return (char *) domain->data + W (domain->must_swap,
- domain->trans_tab[nstr - 1].offset);
- while (1)
- {
- if (idx >= domain->hash_size - incr)
- idx -= domain->hash_size - incr;
- else
- idx += incr;
- nstr = W (domain->must_swap, domain->hash_tab[idx]);
- if (nstr == 0)
- /* Hash table entry is empty. */
- return NULL;
- if (W (domain->must_swap, domain->orig_tab[nstr - 1].length) == len
- && strcmp (msgid,
- domain->data + W (domain->must_swap,
- domain->orig_tab[nstr - 1].offset))
- == 0)
- return (char *) domain->data
- + W (domain->must_swap, domain->trans_tab[nstr - 1].offset);
- }
- /* NOTREACHED */
- }
- /* Now we try the default method: binary search in the sorted
- array of messages. */
- bottom = 0;
- top = domain->nstrings;
- while (bottom < top)
- {
- int cmp_val;
- act = (bottom + top) / 2;
- cmp_val = strcmp (msgid, domain->data
- + W (domain->must_swap,
- domain->orig_tab[act].offset));
- if (cmp_val < 0)
- top = act;
- else if (cmp_val > 0)
- bottom = act + 1;
- else
- break;
- }
- /* If an translation is found return this. */
- return bottom >= top ? NULL : (char *) domain->data
- + W (domain->must_swap,
- domain->trans_tab[act].offset);
- }
- /* Return string representation of locale CATEGORY. */
- static const char *
- internal_function
- category_to_name (category)
- int category;
- {
- const char *retval;
- switch (category)
- {
- #ifdef LC_COLLATE
- case LC_COLLATE:
- retval = "LC_COLLATE";
- break;
- #endif
- #ifdef LC_CTYPE
- case LC_CTYPE:
- retval = "LC_CTYPE";
- break;
- #endif
- #ifdef LC_MONETARY
- case LC_MONETARY:
- retval = "LC_MONETARY";
- break;
- #endif
- #ifdef LC_NUMERIC
- case LC_NUMERIC:
- retval = "LC_NUMERIC";
- break;
- #endif
- #ifdef LC_TIME
- case LC_TIME:
- retval = "LC_TIME";
- break;
- #endif
- #ifdef LC_MESSAGES
- case LC_MESSAGES:
- retval = "LC_MESSAGES";
- break;
- #endif
- #ifdef LC_RESPONSE
- case LC_RESPONSE:
- retval = "LC_RESPONSE";
- break;
- #endif
- #ifdef LC_ALL
- case LC_ALL:
- /* This might not make sense but is perhaps better than any other
- value. */
- retval = "LC_ALL";
- break;
- #endif
- default:
- /* If you have a better idea for a default value let me know. */
- retval = "LC_XXX";
- }
- return retval;
- }
- /* Guess value of current locale from value of the environment variables. */
- static const char *
- internal_function
- guess_category_value (category, categoryname)
- int category;
- const char *categoryname;
- {
- const char *retval;
- /* The highest priority value is the `LANGUAGE' environment
- variable. This is a GNU extension. */
- retval = getenv ("LANGUAGE");
- if (retval != NULL && retval[0] != ' ')
- return retval;
- /* `LANGUAGE' is not set. So we have to proceed with the POSIX
- methods of looking to `LC_ALL', `LC_xxx', and `LANG'. On some
- systems this can be done by the `setlocale' function itself. */
- #if defined HAVE_SETLOCALE && defined HAVE_LC_MESSAGES && defined HAVE_LOCALE_NULL
- return setlocale (category, NULL);
- #else
- /* Setting of LC_ALL overwrites all other. */
- retval = getenv ("LC_ALL");
- if (retval != NULL && retval[0] != ' ')
- return retval;
- /* Next comes the name of the desired category. */
- retval = getenv (categoryname);
- if (retval != NULL && retval[0] != ' ')
- return retval;
- /* Last possibility is the LANG environment variable. */
- retval = getenv ("LANG");
- if (retval != NULL && retval[0] != ' ')
- return retval;
- /* We use C as the default domain. POSIX says this is implementation
- defined. */
- return "C";
- #endif
- }
- /* @@ begin of epilog @@ */
- /* We don't want libintl.a to depend on any other library. So we
- avoid the non-standard function stpcpy. In GNU C Library this
- function is available, though. Also allow the symbol HAVE_STPCPY
- to be defined. */
- #if !_LIBC && !HAVE_STPCPY
- static char *
- stpcpy (dest, src)
- char *dest;
- const char *src;
- {
- while ((*dest++ = *src++) != ' ')
- /* Do nothing. */ ;
- return dest - 1;
- }
- #endif
- #ifdef _LIBC
- /* If we want to free all resources we have to do some work at
- program's end. */
- static void __attribute__ ((unused))
- free_mem (void)
- {
- struct binding *runp;
- for (runp = _nl_domain_bindings; runp != NULL; runp = runp->next)
- {
- free (runp->domainname);
- if (runp->dirname != _nl_default_dirname)
- /* Yes, this is a pointer comparison. */
- free (runp->dirname);
- }
- if (_nl_current_default_domain != _nl_default_default_domain)
- /* Yes, again a pointer comparison. */
- free ((char *) _nl_current_default_domain);
- }
- text_set_element (__libc_subfreeres, free_mem);
- #endif