intl/explodename.c

   1 /* Copyright (C) 1995-2023 Free Software Foundation, Inc.
   2    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as published by
   6    the Free Software Foundation; either version 2.1 of the License, or
   7    (at your option) any later version.
   8
   9    This program 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
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #ifdef HAVE_CONFIG_H
  18 # include <config.h>
  19 #endif
  20
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <sys/types.h>
  24
  25 #include "loadinfo.h"
  26
  27 /* On some strange systems still no definition of NULL is found.  Sigh!  */
  28 #ifndef NULL
  29 # if defined __STDC__ && __STDC__
  30 #  define NULL ((void *) 0)
  31 # else
  32 #  define NULL 0
  33 # endif
  34 #endif
  35
  36 /* @@ end of prolog @@ */
  37
  38 /* Split a locale name NAME into a leading language part and all the
  39    rest.  Return a pointer to the first character after the language,
  40    i.e. to the first byte of the rest.  */
  41 static char *_nl_find_language (const char *name);
  42
  43 static char *
  44 _nl_find_language (const char *name)
  45 {
  46   while (name[0] != '\0' && name[0] != '_' && name[0] != '@' && name[0] != '.')
  47     ++name;
  48
  49   return (char *) name;
  50 }
  51
  52
  53 int
  54 _nl_explode_name (char *name,
  55                   const char **language, const char **modifier,
  56                   const char **territory, const char **codeset,
  57                   const char **normalized_codeset)
  58 {
  59   char *cp;
  60   int mask;
  61
  62   *modifier = NULL;
  63   *territory = NULL;
  64   *codeset = NULL;
  65   *normalized_codeset = NULL;
  66
  67   /* Now we determine the single parts of the locale name.  First
  68      look for the language.  Termination symbols are `_', '.', and `@'.  */
  69   mask = 0;
  70   *language = cp = name;
  71   cp = _nl_find_language (*language);
  72
  73   if (*language == cp)
  74     /* This does not make sense: language has to be specified.  Use
  75        this entry as it is without exploding.  Perhaps it is an alias.  */
  76     cp = strchr (*language, '\0');
  77   else
  78     {
  79       if (cp[0] == '_')
  80         {
  81           /* Next is the territory.  */
  82           cp[0] = '\0';
  83           *territory = ++cp;
  84
  85           while (cp[0] != '\0' && cp[0] != '.' && cp[0] != '@')
  86             ++cp;
  87
  88           mask |= XPG_TERRITORY;
  89         }
  90
  91       if (cp[0] == '.')
  92         {
  93           /* Next is the codeset.  */
  94           cp[0] = '\0';
  95           *codeset = ++cp;
  96
  97           while (cp[0] != '\0' && cp[0] != '@')
  98             ++cp;
  99
 100           mask |= XPG_CODESET;
 101
 102           if (*codeset != cp && (*codeset)[0] != '\0')
 103             {
 104               *normalized_codeset = _nl_normalize_codeset (*codeset,
 105                                                            cp - *codeset);
 106               if (*normalized_codeset == NULL)
 107                 return -1;
 108               else if (strcmp (*codeset, *normalized_codeset) == 0)
 109                 free ((char *) *normalized_codeset);
 110               else
 111                 mask |= XPG_NORM_CODESET;
 112             }
 113         }
 114     }
 115
 116   if (cp[0] == '@')
 117     {
 118       /* Next is the modifier.  */
 119       cp[0] = '\0';
 120       *modifier = ++cp;
 121
 122       if (cp[0] != '\0')
 123         mask |= XPG_MODIFIER;
 124     }
 125
 126   if (*territory != NULL && (*territory)[0] == '\0')
 127     mask &= ~XPG_TERRITORY;
 128
 129   if (*codeset != NULL && (*codeset)[0] == '\0')
 130     mask &= ~XPG_CODESET;
 131
 132   return mask;
 133 }