catgets/catgets.c

   1 /* Copyright (C) 1996, 1997, 1998, 1999 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 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 = NULL;
  37   const char *nlspath = NULL;
  38   size_t cat_name_len = strlen (cat_name) + 1;
  39   size_t env_var_len = 0;
  40   size_t nlspath_len = 0;
  41   char *endp;
  42
  43   if (strchr (cat_name, '/') == NULL)
  44     {
  45       if (flag == NL_CAT_LOCALE)
  46         {
  47           env_var = getenv ("LC_ALL");
  48           if (env_var == NULL)
  49             env_var = getenv ("LC_MESSAGES");
  50
  51           if (env_var != NULL)
  52             goto have_env_var;
  53         }
  54
  55       env_var = getenv ("LANG");
  56       if (env_var == NULL)
  57         env_var = "C";
  58
  59     have_env_var:
  60       env_var_len = strlen (env_var) + 1;
  61
  62       nlspath = __secure_getenv ("NLSPATH");
  63       if (nlspath != NULL && *nlspath != '\0')
  64         {
  65           /* Append the system dependent directory.  */
  66           size_t len = strlen (nlspath) + 1 + sizeof NLSPATH;
  67           char *tmp = alloca (len);
  68
  69           __stpcpy (__stpcpy (__stpcpy (tmp, nlspath), ":"), NLSPATH);
  70           nlspath = tmp;
  71
  72           nlspath_len = len;
  73         }
  74       else
  75         {
  76           nlspath = NLSPATH;
  77
  78           nlspath_len = sizeof NLSPATH;
  79         }
  80     }
  81
  82   result = (__nl_catd) malloc (sizeof (*result) + cat_name_len
  83                                + env_var_len + nlspath_len);
  84   if (result == NULL)
  85     /* We cannot get enough memory.  */
  86     return (nl_catd) -1;
  87
  88   result->status = closed;
  89   result->cat_name = endp = (char *) (result + 1);
  90   endp = __mempcpy (endp, cat_name, cat_name_len);
  91
  92   result->env_var = cat_name_len != 0 ? endp : NULL;
  93   endp = __mempcpy (endp, env_var, env_var_len);
  94
  95   result->nlspath = nlspath_len != 0 ? endp : NULL;
  96   memcpy (endp, nlspath, nlspath_len);
  97
  98   __libc_lock_init (result->lock);
  99
 100   return (nl_catd) result;
 101 }
 102
 103
 104 /* Return message from message catalog.  */
 105 char *
 106 catgets (nl_catd catalog_desc, int set, int message, const char *string)
 107 {
 108   __nl_catd catalog;
 109   size_t idx;
 110   size_t cnt;
 111
 112   /* Be generous if catalog which failed to be open is used.  */
 113   if (catalog_desc == (nl_catd) -1 || ++set <= 0 || message < 0)
 114     return (char *) string;
 115
 116   catalog = (__nl_catd) catalog_desc;
 117
 118   if (catalog->status == closed)
 119     __open_catalog (catalog);
 120
 121   if (catalog->status == nonexisting)
 122     {
 123       __set_errno (EBADF);
 124       return (char *) string;
 125     }
 126
 127   idx = ((set * message) % catalog->plane_size) * 3;
 128   cnt = 0;
 129   do
 130     {
 131       if (catalog->name_ptr[idx + 0] == (u_int32_t) set
 132           && catalog->name_ptr[idx + 1] == (u_int32_t) message)
 133         return (char *) &catalog->strings[catalog->name_ptr[idx + 2]];
 134
 135       idx += catalog->plane_size * 3;
 136     }
 137   while (++cnt < catalog->plane_depth);
 138
 139   __set_errno (ENOMSG);
 140   return (char *) string;
 141 }
 142
 143
 144 /* Return resources used for loaded message catalog.  */
 145 int
 146 catclose (nl_catd catalog_desc)
 147 {
 148   __nl_catd catalog;
 149
 150   catalog = (__nl_catd) catalog_desc;
 151
 152 #ifdef _POSIX_MAPPED_FILES
 153   if (catalog->status == mmapped)
 154     __munmap ((void *) catalog->file_ptr, catalog->file_size);
 155   else
 156 #endif  /* _POSIX_MAPPED_FILES */
 157     if (catalog->status == malloced)
 158       free ((void *) catalog->file_ptr);
 159     else if (catalog->status != closed && catalog->status != nonexisting)
 160       {
 161         __set_errno (EBADF);
 162         return -1;
 163       }
 164
 165   free ((void *) catalog);
 166
 167   return 0;
 168 }