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bindtextdom.c

/* Implementation of the bindtextdomain(3) function
   Copyright (C) 1995-1998, 2000, 2001, 2002 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU Library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library 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 <stddef.h>
#include <stdlib.h>
#include <string.h>

#ifdef _LIBC
# include <libintl.h>
#else
# include "libgnuintl.h"
#endif
#include "gettextP.h"

#ifdef _LIBC
/* We have to handle multi-threaded applications.  */
# include <bits/libc-lock.h>
#else
/* Provide dummy implementation if this is outside glibc.  */
# define __libc_rwlock_define(CLASS, NAME)
# define __libc_rwlock_wrlock(NAME)
# define __libc_rwlock_unlock(NAME)
#endif

/* The internal variables in the standalone libintl.a must have different
   names than the internal variables in GNU libc, otherwise programs
   using libintl.a cannot be linked statically.  */
#if !defined _LIBC
# define _nl_default_dirname libintl_nl_default_dirname
# define _nl_domain_bindings libintl_nl_domain_bindings
#endif

/* Some compilers, like SunOS4 cc, don't have offsetof in <stddef.h>.  */
#ifndef offsetof
# define offsetof(type,ident) ((size_t)&(((type*)0)->ident))
#endif

/* @@ end of prolog @@ */

/* Contains the default location of the message catalogs.  */
extern const char _nl_default_dirname[];
#ifdef _LIBC
extern const char _nl_default_dirname_internal[] attribute_hidden;
#else
# define INTUSE(name) name
#endif

/* List with bindings of specific domains.  */
extern struct binding *_nl_domain_bindings;

/* Lock variable to protect the global data in the gettext implementation.  */
__libc_rwlock_define(extern, _nl_state_lock attribute_hidden)


/* 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 BINDTEXTDOMAIN __bindtextdomain
# define BIND_TEXTDOMAIN_CODESET __bind_textdomain_codeset
# ifndef strdup
#  define strdup(str) __strdup (str)
# endif
#else
# define BINDTEXTDOMAIN libintl_bindtextdomain
# define BIND_TEXTDOMAIN_CODESET libintl_bind_textdomain_codeset
#endif
/* Prototypes for local functions.  */
     static void set_binding_values PARAMS((const char *domainname,
                                            const char **dirnamep,
                                            const char **codesetp));

/* Specifies the directory name *DIRNAMEP and the output codeset *CODESETP
   to be used for the DOMAINNAME message catalog.
   If *DIRNAMEP or *CODESETP is NULL, the corresponding attribute is not
   modified, only the current value is returned.
   If DIRNAMEP or CODESETP is NULL, the corresponding attribute is neither
   modified nor returned.  */
     static void
      set_binding_values(domainname, dirnamep, codesetp)
     const char *domainname;
     const char **dirnamep;
     const char **codesetp;
{
    struct binding *binding;
    int modified;

    /* Some sanity checks.  */
    if (domainname == NULL || domainname[0] == '\0') {
        if (dirnamep)
            *dirnamep = NULL;
        if (codesetp)
            *codesetp = NULL;
        return;
    }

    __libc_rwlock_wrlock(_nl_state_lock);

    modified = 0;

    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) {
        if (dirnamep) {
            const char *dirname = *dirnamep;

            if (dirname == NULL)
                /* The current binding has be to returned.  */
                *dirnamep = binding->dirname;
            else {
                /* The domain is already bound.  If the new value and the old
                   one are equal we simply do nothing.  Otherwise replace the
                   old binding.  */
                char *result = binding->dirname;
                if (strcmp(dirname, result) != 0) {
                    if (strcmp(dirname, INTUSE(_nl_default_dirname)) == 0)
                        result = (char *) INTUSE(_nl_default_dirname);
                    else {
#if defined _LIBC || defined HAVE_STRDUP
                        result = strdup(dirname);
#else
                        size_t len = strlen(dirname) + 1;
                        result = (char *) malloc(len);
                        if (__builtin_expect(result != NULL, 1))
                            memcpy(result, dirname, len);
#endif
                    }

                    if (__builtin_expect(result != NULL, 1)) {
                        if (binding->dirname != INTUSE(_nl_default_dirname))
                            free(binding->dirname);

                        binding->dirname = result;
                        modified = 1;
                    }
                }
                *dirnamep = result;
            }
        }

        if (codesetp) {
            const char *codeset = *codesetp;

            if (codeset == NULL)
                /* The current binding has be to returned.  */
                *codesetp = binding->codeset;
            else {
                /* The domain is already bound.  If the new value and the old
                   one are equal we simply do nothing.  Otherwise replace the
                   old binding.  */
                char *result = binding->codeset;
                if (result == NULL || strcmp(codeset, result) != 0) {
#if defined _LIBC || defined HAVE_STRDUP
                    result = strdup(codeset);
#else
                    size_t len = strlen(codeset) + 1;
                    result = (char *) malloc(len);
                    if (__builtin_expect(result != NULL, 1))
                        memcpy(result, codeset, len);
#endif

                    if (__builtin_expect(result != NULL, 1)) {
                        if (binding->codeset != NULL)
                            free(binding->codeset);

                        binding->codeset = result;
                        binding->codeset_cntr++;
                        modified = 1;
                    }
                }
                *codesetp = result;
            }
        }
    }
    else if ((dirnamep == NULL || *dirnamep == NULL)
             && (codesetp == NULL || *codesetp == NULL)) {
        /* Simply return the default values.  */
        if (dirnamep)
            *dirnamep = INTUSE(_nl_default_dirname);
        if (codesetp)
            *codesetp = NULL;
    }
    else {
        /* We have to create a new binding.  */
        size_t len = strlen(domainname) + 1;
        struct binding *new_binding =
            (struct binding *) malloc(offsetof(struct binding, domainname) +
                                      len);

        if (__builtin_expect(new_binding == NULL, 0))
            goto failed;

        memcpy(new_binding->domainname, domainname, len);

        if (dirnamep) {
            const char *dirname = *dirnamep;

            if (dirname == NULL)
                /* The default value.  */
                dirname = INTUSE(_nl_default_dirname);
            else {
                if (strcmp(dirname, INTUSE(_nl_default_dirname)) == 0)
                    dirname = INTUSE(_nl_default_dirname);
                else {
                    char *result;
#if defined _LIBC || defined HAVE_STRDUP
                    result = strdup(dirname);
                    if (__builtin_expect(result == NULL, 0))
                        goto failed_dirname;
#else
                    size_t len = strlen(dirname) + 1;
                    result = (char *) malloc(len);
                    if (__builtin_expect(result == NULL, 0))
                        goto failed_dirname;
                    memcpy(result, dirname, len);
#endif
                    dirname = result;
                }
            }
            *dirnamep = dirname;
            new_binding->dirname = (char *) dirname;
        }
        else
            /* The default value.  */
            new_binding->dirname = (char *) INTUSE(_nl_default_dirname);

        new_binding->codeset_cntr = 0;

        if (codesetp) {
            const char *codeset = *codesetp;

            if (codeset != NULL) {
                char *result;

#if defined _LIBC || defined HAVE_STRDUP
                result = strdup(codeset);
                if (__builtin_expect(result == NULL, 0))
                    goto failed_codeset;
#else
                size_t len = strlen(codeset) + 1;
                result = (char *) malloc(len);
                if (__builtin_expect(result == NULL, 0))
                    goto failed_codeset;
                memcpy(result, codeset, len);
#endif
                codeset = result;
                new_binding->codeset_cntr++;
            }
            *codesetp = codeset;
            new_binding->codeset = (char *) codeset;
        }
        else
            new_binding->codeset = NULL;

        /* Now enqueue it.  */
        if (_nl_domain_bindings == NULL
            || strcmp(domainname, _nl_domain_bindings->domainname) < 0) {
            new_binding->next = _nl_domain_bindings;
            _nl_domain_bindings = new_binding;
        }
        else {
            binding = _nl_domain_bindings;
            while (binding->next != NULL
                   && strcmp(domainname, binding->next->domainname) > 0)
                binding = binding->next;

            new_binding->next = binding->next;
            binding->next = new_binding;
        }

        modified = 1;

        /* Here we deal with memory allocation failures.  */
        if (0) {
          failed_codeset:
            if (new_binding->dirname != INTUSE(_nl_default_dirname))
                free(new_binding->dirname);
          failed_dirname:
            free(new_binding);
          failed:
            if (dirnamep)
                *dirnamep = NULL;
            if (codesetp)
                *codesetp = NULL;
        }
    }

    /* If we modified any binding, we flush the caches.  */
    if (modified)
        ++_nl_msg_cat_cntr;

    __libc_rwlock_unlock(_nl_state_lock);
}

/* Specify that the DOMAINNAME message catalog will be found
   in DIRNAME rather than in the system locale data base.  */
char *
BINDTEXTDOMAIN(domainname, dirname)
     const char *domainname;
     const char *dirname;
{
    set_binding_values(domainname, &dirname, NULL);
    return (char *) dirname;
}

/* Specify the character encoding in which the messages from the
   DOMAINNAME message catalog will be returned.  */
char *
BIND_TEXTDOMAIN_CODESET(domainname, codeset)
     const char *domainname;
     const char *codeset;
{
    set_binding_values(domainname, NULL, &codeset);
    return (char *) codeset;
}

#ifdef _LIBC
/* Aliases for function names in GNU C Library.  */
weak_alias(__bindtextdomain, bindtextdomain);
weak_alias(__bind_textdomain_codeset, bind_textdomain_codeset);
#endif

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