catgets/catgets.c

   1 /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <alloca.h>
  21 #include <errno.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;
  37   const char *nlspath;
  38
  39   result = (__nl_catd) malloc (sizeof (*result));
  40   if (result == NULL)
  41     /* We cannot get enough memory.  */
  42     return (nl_catd) -1;
  43
  44   result->status = closed;
  45
  46   result->cat_name = __strdup (cat_name);
  47   if (result->cat_name == NULL)
  48     {
  49       free (result);
  50       __set_errno (ENOMEM);
  51       return (nl_catd) -1;
  52     }
  53
  54   if (strchr (cat_name, '/') == NULL)
  55     {
  56       if (flag == NL_CAT_LOCALE)
  57         {
  58           env_var = getenv ("LC_ALL");
  59           if (env_var == NULL)
  60             {
  61               env_var = getenv ("LC_MESSAGES");
  62               if (env_var == NULL)
  63                 {
  64                   env_var = getenv ("LANG");
  65                   if (env_var == NULL)
  66                     env_var = "C";
  67                 }
  68             }
  69         }
  70       else
  71         {
  72           env_var = getenv ("LANG");
  73           if (env_var == NULL)
  74             env_var = "C";
  75         }
  76
  77       result->env_var = __strdup (env_var);
  78       if (result->env_var == NULL)
  79         {
  80           free ((void *) result->cat_name);
  81           free ((void *) result);
  82           __set_errno (ENOMEM);
  83           return (nl_catd) -1;
  84         }
  85
  86       nlspath = __secure_getenv ("NLSPATH");
  87       if (nlspath != NULL && *nlspath != '\0')
  88         {
  89           /* Append the system dependent directory.  */
  90           size_t len = strlen (nlspath + 1 + sizeof NLSPATH);
  91           char *tmp = alloca (len);
  92
  93           __stpcpy (__stpcpy (__stpcpy (tmp, nlspath), ":"), NLSPATH);
  94           nlspath = tmp;
  95         }
  96       else
  97         result->nlspath = __strdup (NLSPATH);
  98
  99       if (result->nlspath == NULL)
 100         {
 101           free ((void *) result->cat_name);
 102           free ((void *) result->env_var);
 103           free ((void *) result);
 104           __set_errno (ENOMEM);
 105           return (nl_catd) -1;
 106         }
 107     }
 108   else
 109     {
 110       result->env_var = NULL;
 111       result->nlspath = NULL;
 112     }
 113
 114   return (nl_catd) result;
 115 }
 116
 117
 118 /* Return message from message catalog.  */
 119 char *
 120 catgets (nl_catd catalog_desc, int set, int message, const char *string)
 121 {
 122   __nl_catd catalog;
 123   size_t idx;
 124   size_t cnt;
 125
 126   /* Be generous if catalog which failed to be open is used.  */
 127   if (catalog_desc == (nl_catd) -1 || ++set <= 0 || message < 0)
 128     return (char *) string;
 129
 130   catalog = (__nl_catd) catalog_desc;
 131
 132   if (catalog->status == closed)
 133     __open_catalog (catalog, 1);
 134
 135   if (catalog->status == nonexisting)
 136     {
 137       __set_errno (EBADF);
 138       return (char *) string;
 139     }
 140
 141   idx = ((set * message) % catalog->plane_size) * 3;
 142   cnt = 0;
 143   do
 144     {
 145       if (catalog->name_ptr[idx + 0] == (u_int32_t) set
 146           && catalog->name_ptr[idx + 1] == (u_int32_t) message)
 147         return (char *) &catalog->strings[catalog->name_ptr[idx + 2]];
 148
 149       idx += catalog->plane_size * 3;
 150     }
 151   while (++cnt < catalog->plane_depth);
 152
 153   __set_errno (ENOMSG);
 154   return (char *) string;
 155 }
 156
 157
 158 /* Return resources used for loaded message catalog.  */
 159 int
 160 catclose (nl_catd catalog_desc)
 161 {
 162   __nl_catd catalog;
 163
 164   catalog = (__nl_catd) catalog_desc;
 165
 166   if (catalog->status == mmapped)
 167     munmap ((void *) catalog->file_ptr, catalog->file_size);
 168   else if (catalog->status == malloced)
 169     free ((void *) catalog->file_ptr);
 170   else if (catalog->status != closed && catalog->status != nonexisting)
 171     {
 172       __set_errno (EBADF);
 173       return -1;
 174     }
 175
 176   if (catalog->nlspath)
 177     free ((void *) catalog->nlspath);
 178   if (catalog->env_var)
 179     free ((void *) catalog->env_var);
 180   free ((void *) catalog);
 181
 182   return 0;
 183 }