locale/newlocale.c

   1 /* Return a reference to locale information record.
   2    Copyright (C) 1996, 1997, 1999 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <argz.h>
  22 #include <errno.h>
  23 #include <locale.h>
  24 #include <stdlib.h>
  25
  26 #include "localeinfo.h"
  27
  28
  29 /* Constant data defined in setlocale.c.  */
  30 extern struct locale_data *const _nl_C[];
  31
  32 /* Use this when we come along an error.  */
  33 #define ERROR_RETURN                                                          \
  34   do {                                                                        \
  35     __set_errno (EINVAL);                                                     \
  36     return NULL;                                                              \
  37   } while (0)
  38
  39
  40 __locale_t
  41 __newlocale (int category_mask, const char *locale, __locale_t base)
  42 {
  43   /* Intermediate memory for result.  */
  44   const char *newnames[__LC_LAST];
  45   struct __locale_struct result;
  46   __locale_t result_ptr;
  47   char *locale_path;
  48   size_t locale_path_len;
  49   const char *locpath_var;
  50   int cnt;
  51
  52   /* We treat LC_ALL in the same way as if all bits were set.  */
  53   if (category_mask == LC_ALL)
  54     category_mask = (1 << __LC_LAST) - 1 - (1 << LC_ALL);
  55
  56   /* Sanity check for CATEGORY argument.  */
  57   if ((category_mask & ~((1 << LC_ALL) - 1 - (1 << LC_ALL))) != 0)
  58     ERROR_RETURN;
  59
  60   /* `newlocale' does not support asking for the locale name. */
  61   if (locale == NULL)
  62     ERROR_RETURN;
  63
  64   /* Allocate memory for the result.  */
  65   if (base != NULL)
  66     {
  67       if (base != NULL)
  68         return base;
  69
  70       result = *base;
  71     }
  72   else
  73     {
  74       /* Fill with pointers to C locale data to .  */
  75       for (cnt = 0; cnt < __LC_LAST; ++cnt)
  76         if (cnt != LC_ALL)
  77           result.__locales[cnt] = _nl_C[cnt];
  78
  79       /* If no category is to be set we return BASE if available or a
  80          dataset using the C locale data.  */
  81       if (category_mask == 0)
  82         {
  83           result_ptr = (__locale_t) malloc (sizeof (struct __locale_struct));
  84           *result_ptr = result;
  85
  86           goto update;
  87         }
  88     }
  89
  90   /* We perhaps really have to load some data.  So we determine the
  91      path in which to look for the data now.  The environment variable
  92      `LOCPATH' must only be used when the binary has no SUID or SGID
  93      bit set.  */
  94   locale_path = NULL;
  95   locale_path_len = 0;
  96
  97   locpath_var = __secure_getenv ("LOCPATH");
  98   if (locpath_var != NULL && locpath_var[0] != '\0')
  99     if (__argz_create_sep (locpath_var, ':',
 100                            &locale_path, &locale_path_len) != 0)
 101       return NULL;
 102
 103   if (__argz_append (&locale_path, &locale_path_len,
 104                      LOCALE_PATH, sizeof (LOCALE_PATH)) != 0)
 105     return NULL;
 106
 107   /* Get the names for the locales we are interested in.  We either
 108      allow a composite name or a single name.  */
 109   for (cnt = 0; cnt < __LC_LAST; ++cnt)
 110     if (cnt != LC_ALL)
 111       newnames[cnt] = locale;
 112   if (strchr (locale, ';') != NULL)
 113     {
 114       /* This is a composite name.  Make a copy and split it up.  */
 115       char *np = strdupa (locale);
 116       char *cp;
 117
 118       while ((cp = strchr (np, '=')) != NULL)
 119         {
 120           for (cnt = 0; cnt < __LC_LAST; ++cnt)
 121             if (cnt != LC_ALL
 122                 && (size_t) (cp - np) == _nl_category_name_sizes[cnt]
 123                 && memcmp (np, _nl_category_names[cnt], cp - np) == 0)
 124               break;
 125
 126           if (cnt == __LC_LAST)
 127             /* Bogus category name.  */
 128             ERROR_RETURN;
 129
 130           /* Found the category this clause sets.  */
 131           newnames[cnt] = ++cp;
 132           cp = strchr (cp, ';');
 133           if (cp != NULL)
 134             {
 135               /* Examine the next clause.  */
 136               *cp = '\0';
 137               np = cp + 1;
 138             }
 139           else
 140             /* This was the last clause.  We are done.  */
 141             break;
 142         }
 143
 144       for (cnt = 0; cnt < __LC_LAST; ++cnt)
 145         if (cnt != LC_ALL
 146             && (category_mask & 1 << cnt) != 0 && newnames[cnt] == locale)
 147           /* The composite name did not specify the category we need.  */
 148           ERROR_RETURN;
 149     }
 150
 151   /* Now process all categories we are interested in.  */
 152   for (cnt = 0; cnt < __LC_LAST; ++cnt)
 153     if (cnt != LC_ALL && (category_mask & 1 << cnt) != 0)
 154       {
 155         result.__locales[cnt] = _nl_find_locale (locale_path, locale_path_len,
 156                                                  cnt, &newnames[cnt]);
 157         if (result.__locales[cnt] == NULL)
 158           return NULL;
 159       }
 160
 161   /* We successfully loaded all required data.  */
 162   if (base == NULL)
 163     {
 164       /* Allocate new structure.  */
 165       result_ptr = (__locale_t) malloc (sizeof (struct __locale_struct));
 166       if (result_ptr == NULL)
 167         return NULL;
 168
 169       *result_ptr = result;
 170     }
 171   else
 172     *(result_ptr = base) = result;
 173
 174   /* Update the special members.  */
 175  update:
 176   {
 177     union locale_data_value *ctypes = result_ptr->__locales[LC_CTYPE]->values;
 178   result_ptr->__ctype_b = (const unsigned short int *)
 179     (ctypes[_NL_ITEM_INDEX (_NL_CTYPE_CLASS)] .string);
 180   result_ptr->__ctype_tolower = (const int *)
 181     (ctypes[_NL_ITEM_INDEX (_NL_CTYPE_TOLOWER)].string);
 182   result_ptr->__ctype_toupper = (const int *)
 183     (ctypes[_NL_ITEM_INDEX (_NL_CTYPE_TOUPPER)].string);
 184   }
 185
 186   return result_ptr;
 187 }