catgets/catgets.c

   1 /* Copyright (C) 1996-2018 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 <errno.h>
  20 #include <locale.h>
  21 #include <nl_types.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include <sys/mman.h>
  26
  27 #include "catgetsinfo.h"
  28
  29
  30 /* Open the catalog and return a descriptor for the catalog.  */
  31 nl_catd
  32 catopen (const char *cat_name, int flag)
  33 {
  34   __nl_catd result;
  35   const char *env_var = NULL;
  36   const char *nlspath = NULL;
  37   char *tmp = 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           tmp = malloc (len);
  58
  59           if (__glibc_unlikely (tmp == NULL))
  60             return (nl_catd) -1;
  61
  62           __stpcpy (__stpcpy (__stpcpy (tmp, nlspath), ":"), NLSPATH);
  63           nlspath = tmp;
  64         }
  65       else
  66         nlspath = NLSPATH;
  67     }
  68
  69   result = (__nl_catd) malloc (sizeof (*result));
  70   if (result == NULL)
  71     {
  72       /* We cannot get enough memory.  */
  73       result = (nl_catd) -1;
  74     }
  75   else if (__open_catalog (cat_name, nlspath, env_var, result) != 0)
  76     {
  77       /* Couldn't open the file.  */
  78       free ((void *) result);
  79       result = (nl_catd) -1;
  80     }
  81
  82   free (tmp);
  83   return (nl_catd) result;
  84 }
  85
  86
  87 /* Return message from message catalog.  */
  88 char *
  89 catgets (nl_catd catalog_desc, int set, int message, const char *string)
  90 {
  91   __nl_catd catalog;
  92   size_t idx;
  93   size_t cnt;
  94
  95   /* Be generous if catalog which failed to be open is used.  */
  96   if (catalog_desc == (nl_catd) -1 || ++set <= 0 || message < 0)
  97     return (char *) string;
  98
  99   catalog = (__nl_catd) catalog_desc;
 100
 101   idx = ((set * message) % catalog->plane_size) * 3;
 102   cnt = 0;
 103   do
 104     {
 105       if (catalog->name_ptr[idx + 0] == (uint32_t) set
 106           && catalog->name_ptr[idx + 1] == (uint32_t) message)
 107         return (char *) &catalog->strings[catalog->name_ptr[idx + 2]];
 108
 109       idx += catalog->plane_size * 3;
 110     }
 111   while (++cnt < catalog->plane_depth);
 112
 113   __set_errno (ENOMSG);
 114   return (char *) string;
 115 }
 116
 117
 118 /* Return resources used for loaded message catalog.  */
 119 int
 120 catclose (nl_catd catalog_desc)
 121 {
 122   __nl_catd catalog;
 123
 124   /* Be generous if catalog which failed to be open is used.  */
 125   if (catalog_desc == (nl_catd) -1)
 126     {
 127       __set_errno (EBADF);
 128       return -1;
 129     }
 130
 131   catalog = (__nl_catd) catalog_desc;
 132
 133 #ifdef _POSIX_MAPPED_FILES
 134   if (catalog->status == mmapped)
 135     __munmap ((void *) catalog->file_ptr, catalog->file_size);
 136   else
 137 #endif  /* _POSIX_MAPPED_FILES */
 138     if (catalog->status == malloced)
 139       free ((void *) catalog->file_ptr);
 140     else
 141       {
 142         __set_errno (EBADF);
 143         return -1;
 144       }
 145
 146   free ((void *) catalog);
 147
 148   return 0;
 149 }