catgets/catgets.c

   1 /* Copyright (C) 1996-2000, 2001, 2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper, <drepper@gnu.org>.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <alloca.h>
  21 #include <errno.h>
  22 #include <locale.h>
  23 #include <nl_types.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <sys/mman.h>
  28
  29 #include "catgetsinfo.h"
  30
  31
  32 /* Open the catalog and return a descriptor for the catalog.  */
  33 nl_catd
  34 catopen (const char *cat_name, int flag)
  35 {
  36   __nl_catd result;
  37   const char *env_var = NULL;
  38   const char *nlspath = NULL;
  39
  40   if (strchr (cat_name, '/') == NULL)
  41     {
  42       if (flag == NL_CAT_LOCALE)
  43         /* Use the current locale setting for LC_MESSAGES.  */
  44         env_var = setlocale (LC_MESSAGES, NULL);
  45       else
  46         /* Use the LANG environment variable.  */
  47         env_var = getenv ("LANG");
  48
  49       if (env_var == NULL || *env_var == '\0'
  50           || (__libc_enable_secure && strchr (env_var, '/') != NULL))
  51         env_var = "C";
  52
  53       nlspath = getenv ("NLSPATH");
  54       if (nlspath != NULL && *nlspath != '\0')
  55         {
  56           /* Append the system dependent directory.  */
  57           size_t len = strlen (nlspath) + 1 + sizeof NLSPATH;
  58           char *tmp = alloca (len);
  59
  60           __stpcpy (__stpcpy (__stpcpy (tmp, nlspath), ":"), NLSPATH);
  61           nlspath = tmp;
  62         }
  63       else
  64         nlspath = NLSPATH;
  65     }
  66
  67   result = (__nl_catd) malloc (sizeof (*result));
  68   if (result == NULL)
  69     /* We cannot get enough memory.  */
  70     return (nl_catd) -1;
  71
  72   if (__open_catalog (cat_name, nlspath, env_var, result) != 0)
  73     {
  74       /* Couldn't open the file.  */
  75       free ((void *) result);
  76       return (nl_catd) -1;
  77     }
  78
  79   return (nl_catd) result;
  80 }
  81
  82
  83 /* Return message from message catalog.  */
  84 char *
  85 catgets (nl_catd catalog_desc, int set, int message, const char *string)
  86 {
  87   __nl_catd catalog;
  88   size_t idx;
  89   size_t cnt;
  90
  91   /* Be generous if catalog which failed to be open is used.  */
  92   if (catalog_desc == (nl_catd) -1 || ++set <= 0 || message < 0)
  93     return (char *) string;
  94
  95   catalog = (__nl_catd) catalog_desc;
  96
  97   idx = ((set * message) % catalog->plane_size) * 3;
  98   cnt = 0;
  99   do
 100     {
 101       if (catalog->name_ptr[idx + 0] == (u_int32_t) set
 102           && catalog->name_ptr[idx + 1] == (u_int32_t) message)
 103         return (char *) &catalog->strings[catalog->name_ptr[idx + 2]];
 104
 105       idx += catalog->plane_size * 3;
 106     }
 107   while (++cnt < catalog->plane_depth);
 108
 109   __set_errno (ENOMSG);
 110   return (char *) string;
 111 }
 112
 113
 114 /* Return resources used for loaded message catalog.  */
 115 int
 116 catclose (nl_catd catalog_desc)
 117 {
 118   __nl_catd catalog;
 119
 120   /* Be generous if catalog which failed to be open is used.  */
 121   if (catalog_desc == (nl_catd) -1)
 122     {
 123       __set_errno (EBADF);
 124       return -1;
 125     }
 126
 127   catalog = (__nl_catd) catalog_desc;
 128
 129 #ifdef _POSIX_MAPPED_FILES
 130   if (catalog->status == mmapped)
 131     __munmap ((void *) catalog->file_ptr, catalog->file_size);
 132   else
 133 #endif  /* _POSIX_MAPPED_FILES */
 134     if (catalog->status == malloced)
 135       free ((void *) catalog->file_ptr);
 136     else
 137       {
 138         __set_errno (EBADF);
 139         return -1;
 140       }
 141
 142   free ((void *) catalog);
 143
 144   return 0;
 145 }