catgets/catgets.c

   1 /* Copyright (C) 1996-2015 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <alloca.h>
  20 #include <errno.h>
  21 #include <locale.h>
  22 #include <nl_types.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <sys/mman.h>
  27
  28 #include "catgetsinfo.h"
  29
  30
  31 /* Open the catalog and return a descriptor for the catalog.  */
  32 nl_catd
  33 catopen (const char *cat_name, int flag)
  34 {
  35   __nl_catd result;
  36   const char *env_var = NULL;
  37   const char *nlspath = NULL;
  38
  39   if (strchr (cat_name, '/') == NULL)
  40     {
  41       if (flag == NL_CAT_LOCALE)
  42         /* Use the current locale setting for LC_MESSAGES.  */
  43         env_var = setlocale (LC_MESSAGES, NULL);
  44       else
  45         /* Use the LANG environment variable.  */
  46         env_var = getenv ("LANG");
  47
  48       if (env_var == NULL || *env_var == '\0'
  49           || (__libc_enable_secure && strchr (env_var, '/') != NULL))
  50         env_var = "C";
  51
  52       nlspath = getenv ("NLSPATH");
  53       if (nlspath != NULL && *nlspath != '\0')
  54         {
  55           /* Append the system dependent directory.  */
  56           size_t len = strlen (nlspath) + 1 + sizeof NLSPATH;
  57           char *tmp = alloca (len);
  58
  59           __stpcpy (__stpcpy (__stpcpy (tmp, nlspath), ":"), NLSPATH);
  60           nlspath = tmp;
  61         }
  62       else
  63         nlspath = NLSPATH;
  64     }
  65
  66   result = (__nl_catd) malloc (sizeof (*result));
  67   if (result == NULL)
  68     /* We cannot get enough memory.  */
  69     return (nl_catd) -1;
  70
  71   if (__open_catalog (cat_name, nlspath, env_var, result) != 0)
  72     {
  73       /* Couldn't open the file.  */
  74       free ((void *) result);
  75       return (nl_catd) -1;
  76     }
  77
  78   return (nl_catd) result;
  79 }
  80
  81
  82 /* Return message from message catalog.  */
  83 char *
  84 catgets (nl_catd catalog_desc, int set, int message, const char *string)
  85 {
  86   __nl_catd catalog;
  87   size_t idx;
  88   size_t cnt;
  89
  90   /* Be generous if catalog which failed to be open is used.  */
  91   if (catalog_desc == (nl_catd) -1 || ++set <= 0 || message < 0)
  92     return (char *) string;
  93
  94   catalog = (__nl_catd) catalog_desc;
  95
  96   idx = ((set * message) % catalog->plane_size) * 3;
  97   cnt = 0;
  98   do
  99     {
 100       if (catalog->name_ptr[idx + 0] == (u_int32_t) set
 101           && catalog->name_ptr[idx + 1] == (u_int32_t) message)
 102         return (char *) &catalog->strings[catalog->name_ptr[idx + 2]];
 103
 104       idx += catalog->plane_size * 3;
 105     }
 106   while (++cnt < catalog->plane_depth);
 107
 108   __set_errno (ENOMSG);
 109   return (char *) string;
 110 }
 111
 112
 113 /* Return resources used for loaded message catalog.  */
 114 int
 115 catclose (nl_catd catalog_desc)
 116 {
 117   __nl_catd catalog;
 118
 119   /* Be generous if catalog which failed to be open is used.  */
 120   if (catalog_desc == (nl_catd) -1)
 121     {
 122       __set_errno (EBADF);
 123       return -1;
 124     }
 125
 126   catalog = (__nl_catd) catalog_desc;
 127
 128 #ifdef _POSIX_MAPPED_FILES
 129   if (catalog->status == mmapped)
 130     __munmap ((void *) catalog->file_ptr, catalog->file_size);
 131   else
 132 #endif  /* _POSIX_MAPPED_FILES */
 133     if (catalog->status == malloced)
 134       free ((void *) catalog->file_ptr);
 135     else
 136       {
 137         __set_errno (EBADF);
 138         return -1;
 139       }
 140
 141   free ((void *) catalog);
 142
 143   return 0;
 144 }