locale/newlocale.c

   1 /* Return a reference to locale information record.
   2    Copyright (C) 1996, 1997, 1999, 2000-2002, 2004, 2005, 2006, 2008
   3    Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, write to the Free
  19    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20    02111-1307 USA.  */
  21
  22 #include <argz.h>
  23 #include <bits/libc-lock.h>
  24 #include <errno.h>
  25 #include <locale.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #include "localeinfo.h"
  30
  31
  32 /* Lock for protecting global data.  */
  33 __libc_rwlock_define (extern , __libc_setlocale_lock attribute_hidden)
  34
  35
  36 /* Use this when we come along an error.  */
  37 #define ERROR_RETURN                                                          \
  38   do {                                                                        \
  39     __set_errno (EINVAL);                                                     \
  40     return NULL;                                                              \
  41   } while (0)
  42
  43
  44 __locale_t
  45 __newlocale (int category_mask, const char *locale, __locale_t base)
  46 {
  47   /* Intermediate memory for result.  */
  48   const char *newnames[__LC_LAST];
  49   struct __locale_struct result;
  50   __locale_t result_ptr;
  51   char *locale_path;
  52   size_t locale_path_len;
  53   const char *locpath_var;
  54   int cnt;
  55   size_t names_len;
  56
  57   /* We treat LC_ALL in the same way as if all bits were set.  */
  58   if (category_mask == 1 << LC_ALL)
  59     category_mask = (1 << __LC_LAST) - 1 - (1 << LC_ALL);
  60
  61   /* Sanity check for CATEGORY argument.  */
  62   if ((category_mask & ~((1 << __LC_LAST) - 1 - (1 << LC_ALL))) != 0)
  63     ERROR_RETURN;
  64
  65   /* `newlocale' does not support asking for the locale name. */
  66   if (locale == NULL)
  67     ERROR_RETURN;
  68
  69   if (base == _nl_C_locobj_ptr)
  70     /* We're to modify BASE, returned for a previous call with "C".
  71        We can't really modify the read-only structure, so instead
  72        start over by copying it.  */
  73     base = NULL;
  74
  75   if ((base == NULL || category_mask == (1 << __LC_LAST) - 1 - (1 << LC_ALL))
  76       && (category_mask == 0 || !strcmp (locale, "C")))
  77     /* Asking for the "C" locale needn't allocate a new object.  */
  78     return _nl_C_locobj_ptr;
  79
  80   /* Allocate memory for the result.  */
  81   if (base != NULL)
  82     result = *base;
  83   else
  84     /* Fill with pointers to C locale data.  */
  85     result = _nl_C_locobj;
  86
  87   /* If no category is to be set we return BASE if available or a
  88      dataset using the C locale data.  */
  89   if (category_mask == 0)
  90     {
  91       result_ptr = (__locale_t) malloc (sizeof (struct __locale_struct));
  92       if (result_ptr == NULL)
  93         return NULL;
  94       *result_ptr = result;
  95
  96       goto update;
  97     }
  98
  99   /* We perhaps really have to load some data.  So we determine the
 100      path in which to look for the data now.  The environment variable
 101      `LOCPATH' must only be used when the binary has no SUID or SGID
 102      bit set.  If using the default path, we tell _nl_find_locale
 103      by passing null and it can check the canonical locale archive.  */
 104   locale_path = NULL;
 105   locale_path_len = 0;
 106
 107   locpath_var = getenv ("LOCPATH");
 108   if (locpath_var != NULL && locpath_var[0] != '\0')
 109     {
 110       if (__argz_create_sep (locpath_var, ':',
 111                              &locale_path, &locale_path_len) != 0)
 112         return NULL;
 113
 114       if (__argz_add_sep (&locale_path, &locale_path_len,
 115                           _nl_default_locale_path, ':') != 0)
 116         return NULL;
 117     }
 118
 119   /* Get the names for the locales we are interested in.  We either
 120      allow a composite name or a single name.  */
 121   for (cnt = 0; cnt < __LC_LAST; ++cnt)
 122     if (cnt != LC_ALL)
 123       newnames[cnt] = locale;
 124   if (strchr (locale, ';') != NULL)
 125     {
 126       /* This is a composite name.  Make a copy and split it up.  */
 127       char *np = strdupa (locale);
 128       char *cp;
 129       int specified_mask = 0;
 130
 131       while ((cp = strchr (np, '=')) != NULL)
 132         {
 133           for (cnt = 0; cnt < __LC_LAST; ++cnt)
 134             if (cnt != LC_ALL
 135                 && (size_t) (cp - np) == _nl_category_name_sizes[cnt]
 136                 && memcmp (np, (_nl_category_names.str
 137                                 + _nl_category_name_idxs[cnt]), cp - np) == 0)
 138               break;
 139
 140           if (cnt == __LC_LAST)
 141             /* Bogus category name.  */
 142             ERROR_RETURN;
 143
 144           /* Found the category this clause sets.  */
 145           specified_mask |= 1 << cnt;
 146           newnames[cnt] = ++cp;
 147           cp = strchr (cp, ';');
 148           if (cp != NULL)
 149             {
 150               /* Examine the next clause.  */
 151               *cp = '\0';
 152               np = cp + 1;
 153             }
 154           else
 155             /* This was the last clause.  We are done.  */
 156             break;
 157         }
 158
 159       if (category_mask &~ specified_mask)
 160         /* The composite name did not specify all categories we need.  */
 161         ERROR_RETURN;
 162     }
 163
 164   /* Protect global data.  */
 165   __libc_rwlock_wrlock (__libc_setlocale_lock);
 166
 167   /* Now process all categories we are interested in.  */
 168   names_len = 0;
 169   for (cnt = 0; cnt < __LC_LAST; ++cnt)
 170     {
 171       if ((category_mask & 1 << cnt) != 0)
 172         {
 173           result.__locales[cnt] = _nl_find_locale (locale_path,
 174                                                    locale_path_len,
 175                                                    cnt, &newnames[cnt]);
 176           if (result.__locales[cnt] == NULL)
 177             {
 178             free_cnt_data_and_exit:
 179               while (cnt-- > 0)
 180                 if (((category_mask & 1 << cnt) != 0)
 181                     && result.__locales[cnt]->usage_count != UNDELETABLE)
 182                   /* We can remove the data.  */
 183                   _nl_remove_locale (cnt, result.__locales[cnt]);
 184
 185               /* Critical section left.  */
 186               __libc_rwlock_unlock (__libc_setlocale_lock);
 187               return NULL;
 188             }
 189
 190           if (newnames[cnt] != _nl_C_name)
 191             names_len += strlen (newnames[cnt]) + 1;
 192         }
 193       else if (cnt != LC_ALL && result.__names[cnt] != _nl_C_name)
 194         /* Tally up the unchanged names from BASE as well.  */
 195         names_len += strlen (result.__names[cnt]) + 1;
 196     }
 197
 198   /* We successfully loaded all required data.  Allocate a new structure.
 199      We can't just reuse the BASE pointer, because the name strings are
 200      changing and we need the old name string area intact so we can copy
 201      out of it into the new one without overlap problems should some
 202      category's name be getting longer.  */
 203   result_ptr = malloc (sizeof (struct __locale_struct) + names_len);
 204   if (result_ptr == NULL)
 205     {
 206       cnt = __LC_LAST;
 207       goto free_cnt_data_and_exit;
 208     }
 209
 210   if (base == NULL)
 211     {
 212       /* Fill in this new structure from scratch.  */
 213
 214       char *namep = (char *) (result_ptr + 1);
 215
 216       /* Install copied new names in the new structure's __names array.
 217          If resolved to "C", that is already in RESULT.__names to start.  */
 218       for (cnt = 0; cnt < __LC_LAST; ++cnt)
 219         if ((category_mask & 1 << cnt) != 0 && newnames[cnt] != _nl_C_name)
 220           {
 221             result.__names[cnt] = namep;
 222             namep = __stpcpy (namep, newnames[cnt]) + 1;
 223           }
 224
 225       *result_ptr = result;
 226     }
 227   else
 228     {
 229       /* We modify the base structure.  */
 230
 231       char *namep = (char *) (result_ptr + 1);
 232
 233       for (cnt = 0; cnt < __LC_LAST; ++cnt)
 234         if ((category_mask & 1 << cnt) != 0)
 235           {
 236             if (base->__locales[cnt]->usage_count != UNDELETABLE)
 237               /* We can remove the old data.  */
 238               _nl_remove_locale (cnt, base->__locales[cnt]);
 239             result_ptr->__locales[cnt] = result.__locales[cnt];
 240
 241             if (newnames[cnt] == _nl_C_name)
 242               result_ptr->__names[cnt] = _nl_C_name;
 243             else
 244               {
 245                 result_ptr->__names[cnt] = namep;
 246                 namep = __stpcpy (namep, newnames[cnt]) + 1;
 247               }
 248           }
 249         else if (cnt != LC_ALL)
 250           {
 251             /* The RESULT members point into the old BASE structure.  */
 252             result_ptr->__locales[cnt] = result.__locales[cnt];
 253             if (result.__names[cnt] == _nl_C_name)
 254               result_ptr->__names[cnt] = _nl_C_name;
 255             else
 256               {
 257                 result_ptr->__names[cnt] = namep;
 258                 namep = __stpcpy (namep, result.__names[cnt]) + 1;
 259               }
 260           }
 261
 262       free (base);
 263     }
 264
 265   /* Critical section left.  */
 266   __libc_rwlock_unlock (__libc_setlocale_lock);
 267
 268   /* Update the special members.  */
 269  update:
 270   {
 271     union locale_data_value *ctypes = result_ptr->__locales[LC_CTYPE]->values;
 272     result_ptr->__ctype_b = (const unsigned short int *)
 273       ctypes[_NL_ITEM_INDEX (_NL_CTYPE_CLASS)].string + 128;
 274     result_ptr->__ctype_tolower = (const int *)
 275       ctypes[_NL_ITEM_INDEX (_NL_CTYPE_TOLOWER)].string + 128;
 276     result_ptr->__ctype_toupper = (const int *)
 277       ctypes[_NL_ITEM_INDEX (_NL_CTYPE_TOUPPER)].string + 128;
 278   }
 279
 280   return result_ptr;
 281 }
 282 weak_alias (__newlocale, newlocale)