catgets/catgets.c

   1 /* Copyright (C) 1996-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <locale.h>
  20 #include <nl_types.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24 #include <sys/mman.h>
  25
  26 #include "catgetsinfo.h"
  27
  28
  29 /* Open the catalog and return a descriptor for the catalog.  */
  30 nl_catd
  31 catopen (const char *cat_name, int flag)
  32 {
  33   __nl_catd result;
  34   const char *env_var = NULL;
  35   const char *nlspath = NULL;
  36   char *tmp = NULL;
  37
  38   if (strchr (cat_name, '/') == NULL)
  39     {
  40       if (flag == NL_CAT_LOCALE)
  41         /* Use the current locale setting for LC_MESSAGES.  */
  42         env_var = setlocale (LC_MESSAGES, NULL);
  43       else
  44         /* Use the LANG environment variable.  */
  45         env_var = getenv ("LANG");
  46
  47       if (env_var == NULL || *env_var == '\0'
  48           || (__libc_enable_secure && strchr (env_var, '/') != NULL))
  49         env_var = "C";
  50
  51       nlspath = getenv ("NLSPATH");
  52       if (nlspath != NULL && *nlspath != '\0')
  53         {
  54           /* Append the system dependent directory.  */
  55           size_t len = strlen (nlspath) + 1 + sizeof NLSPATH;
  56           tmp = malloc (len);
  57
  58           if (__glibc_unlikely (tmp == NULL))
  59             return (nl_catd) -1;
  60
  61           __stpcpy (__stpcpy (__stpcpy (tmp, nlspath), ":"), NLSPATH);
  62           nlspath = tmp;
  63         }
  64       else
  65         nlspath = NLSPATH;
  66     }
  67
  68   result = (__nl_catd) malloc (sizeof (*result));
  69   if (result == NULL)
  70     {
  71       /* We cannot get enough memory.  */
  72       result = (nl_catd) -1;
  73     }
  74   else if (__open_catalog (cat_name, nlspath, env_var, result) != 0)
  75     {
  76       /* Couldn't open the file.  */
  77       free ((void *) result);
  78       result = (nl_catd) -1;
  79     }
  80
  81   free (tmp);
  82   return (nl_catd) result;
  83 }
  84
  85
  86 /* Return message from message catalog.  */
  87 char *
  88 catgets (nl_catd catalog_desc, int set, int message, const char *string)
  89 {
  90   __nl_catd catalog;
  91   size_t idx;
  92   size_t cnt;
  93
  94   /* Be generous if catalog which failed to be open is used.  */
  95   if (catalog_desc == (nl_catd) -1 || ++set <= 0 || message < 0)
  96     return (char *) string;
  97
  98   catalog = (__nl_catd) catalog_desc;
  99
 100   idx = ((set * message) % catalog->plane_size) * 3;
 101   cnt = 0;
 102   do
 103     {
 104       if (catalog->name_ptr[idx + 0] == (uint32_t) set
 105           && catalog->name_ptr[idx + 1] == (uint32_t) message)
 106         return (char *) &catalog->strings[catalog->name_ptr[idx + 2]];
 107
 108       idx += catalog->plane_size * 3;
 109     }
 110   while (++cnt < catalog->plane_depth);
 111
 112   __set_errno (ENOMSG);
 113   return (char *) string;
 114 }
 115
 116
 117 /* Return resources used for loaded message catalog.  */
 118 int
 119 catclose (nl_catd catalog_desc)
 120 {
 121   __nl_catd catalog;
 122
 123   /* Be generous if catalog which failed to be open is used.  */
 124   if (catalog_desc == (nl_catd) -1)
 125     {
 126       __set_errno (EBADF);
 127       return -1;
 128     }
 129
 130   catalog = (__nl_catd) catalog_desc;
 131
 132 #ifdef _POSIX_MAPPED_FILES
 133   if (catalog->status == mmapped)
 134     __munmap ((void *) catalog->file_ptr, catalog->file_size);
 135   else
 136 #endif  /* _POSIX_MAPPED_FILES */
 137     if (catalog->status == malloced)
 138       free ((void *) catalog->file_ptr);
 139     else
 140       {
 141         __set_errno (EBADF);
 142         return -1;
 143       }
 144
 145   free ((void *) catalog);
 146
 147   return 0;
 148 }