locale/lc-time.c

   1 /* Define current locale data for LC_TIME category.
   2    Copyright (C) 1995-1999, 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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 <bits/libc-lock.h>
  21 #include <endian.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <time.h>
  25 #include <wchar.h>
  26 #include "localeinfo.h"
  27
  28 _NL_CURRENT_DEFINE (LC_TIME);
  29
  30 /* Some of the functions here must not be used while setlocale is called.  */
  31 __libc_lock_define (extern, __libc_setlocale_lock)
  32
  33
  34 static int era_initialized;
  35
  36 static struct era_entry *eras;
  37 static size_t num_eras;
  38 static int alt_digits_initialized;
  39 static const char **alt_digits;
  40
  41
  42 static int walt_digits_initialized;
  43 static const wchar_t **walt_digits;
  44
  45
  46 void
  47 _nl_postload_time (void)
  48 {
  49   /* Prepare lazy initialization of `era' and `alt_digits' array.  */
  50   era_initialized = 0;
  51   alt_digits_initialized = 0;
  52   walt_digits_initialized = 0;
  53 }
  54
  55 #define ERA_DATE_CMP(a, b) \
  56   (a[0] < b[0] || (a[0] == b[0] && (a[1] < b[1]                               \
  57                                     || (a[1] == b[1] && a[2] <= b[2]))))
  58
  59 static void
  60 _nl_init_era_entries (void)
  61 {
  62   size_t cnt;
  63
  64   __libc_lock_lock (__libc_setlocale_lock);
  65
  66   if (era_initialized == 0)
  67     {
  68       size_t new_num_eras = _NL_CURRENT_WORD (LC_TIME,
  69                                               _NL_TIME_ERA_NUM_ENTRIES);
  70       if (new_num_eras == 0)
  71         {
  72           free (eras);
  73           eras = NULL;
  74         }
  75       else
  76         {
  77           if (num_eras != new_num_eras)
  78             eras = (struct era_entry *) realloc (eras,
  79                                                  new_num_eras
  80                                                  * sizeof (struct era_entry));
  81           if (eras == NULL)
  82             {
  83               num_eras = 0;
  84               eras = NULL;
  85             }
  86           else
  87             {
  88               const char *ptr = _NL_CURRENT (LC_TIME, _NL_TIME_ERA_ENTRIES);
  89               num_eras = new_num_eras;
  90
  91               for (cnt = 0; cnt < num_eras; ++cnt)
  92                 {
  93                   const char *base_ptr = ptr;
  94                   memcpy ((void *) (eras + cnt), (const void *) ptr,
  95                           sizeof (uint32_t) * 8);
  96
  97                   if (ERA_DATE_CMP(eras[cnt].start_date,
  98                                    eras[cnt].stop_date))
  99                     if (eras[cnt].direction == (uint32_t) '+')
 100                       eras[cnt].absolute_direction = 1;
 101                     else
 102                       eras[cnt].absolute_direction = -1;
 103                   else
 104                     if (eras[cnt].direction == (uint32_t) '+')
 105                       eras[cnt].absolute_direction = -1;
 106                     else
 107                       eras[cnt].absolute_direction = 1;
 108
 109                   /* Skip numeric values.  */
 110                   ptr += sizeof (uint32_t) * 8;
 111
 112                   /* Set and skip era name.  */
 113                   eras[cnt].era_name = ptr;
 114                   ptr = strchr (ptr, '\0') + 1;
 115
 116                   /* Set and skip era format.  */
 117                   eras[cnt].era_format = ptr;
 118                   ptr = strchr (ptr, '\0') + 1;
 119
 120                   ptr += 3 - (((ptr - (const char *) base_ptr) + 3) & 3);
 121
 122                   /* Set and skip wide era name.  */
 123                   eras[cnt].era_wname = (wchar_t *) ptr;
 124                   ptr = (char *) (wcschr ((wchar_t *) ptr, L'\0') + 1);
 125
 126                   /* Set and skip wide era format.  */
 127                   eras[cnt].era_wformat = (wchar_t *) ptr;
 128                   ptr = (char *) (wcschr ((wchar_t *) ptr, L'\0') + 1);
 129                 }
 130             }
 131         }
 132
 133       era_initialized = 1;
 134     }
 135
 136   __libc_lock_unlock (__libc_setlocale_lock);
 137 }
 138
 139
 140 struct era_entry *
 141 _nl_get_era_entry (const struct tm *tp)
 142 {
 143   struct era_entry *result;
 144   int32_t tdate[3];
 145   size_t cnt;
 146
 147   tdate[0] = tp->tm_year;
 148   tdate[1] = tp->tm_mon;
 149   tdate[2] = tp->tm_mday;
 150
 151   if (era_initialized == 0)
 152     _nl_init_era_entries ();
 153
 154   /* Now compare date with the available eras.  */
 155   for (cnt = 0; cnt < num_eras; ++cnt)
 156     if ((ERA_DATE_CMP(eras[cnt].start_date, tdate)
 157          && ERA_DATE_CMP(tdate, eras[cnt].stop_date))
 158         || (ERA_DATE_CMP(eras[cnt].stop_date, tdate)
 159             && ERA_DATE_CMP(tdate, eras[cnt].start_date)))
 160       break;
 161
 162   result = cnt < num_eras ? &eras[cnt] : NULL;
 163
 164   return result;
 165 }
 166
 167
 168 struct era_entry *
 169 _nl_select_era_entry (int cnt)
 170 {
 171   if (era_initialized == 0)
 172     _nl_init_era_entries ();
 173
 174   return &eras[cnt];
 175 }
 176
 177
 178 const char *
 179 _nl_get_alt_digit (unsigned int number)
 180 {
 181   const char *result;
 182
 183   __libc_lock_lock (__libc_setlocale_lock);
 184
 185   if (alt_digits_initialized == 0)
 186     {
 187       alt_digits_initialized = 1;
 188
 189       if (alt_digits == NULL)
 190         alt_digits = malloc (100 * sizeof (const char *));
 191
 192       if (alt_digits != NULL)
 193         {
 194           const char *ptr = _NL_CURRENT (LC_TIME, ALT_DIGITS);
 195           size_t cnt;
 196
 197           if (alt_digits != NULL)
 198             for (cnt = 0; cnt < 100; ++cnt)
 199               {
 200                 alt_digits[cnt] = ptr;
 201
 202                 /* Skip digit format. */
 203                 ptr = strchr (ptr, '\0') + 1;
 204               }
 205         }
 206     }
 207
 208   result = alt_digits != NULL && number < 100 ? alt_digits[number] : NULL;
 209
 210   __libc_lock_unlock (__libc_setlocale_lock);
 211
 212   return result;
 213 }
 214
 215
 216 const wchar_t *
 217 _nl_get_walt_digit (unsigned int number)
 218 {
 219   const wchar_t *result;
 220
 221   __libc_lock_lock (__libc_setlocale_lock);
 222
 223   if (walt_digits_initialized == 0)
 224     {
 225       walt_digits_initialized = 1;
 226
 227       if (walt_digits == NULL)
 228         walt_digits = malloc (100 * sizeof (const uint32_t *));
 229
 230       if (walt_digits != NULL)
 231         {
 232           const wchar_t *ptr = _NL_CURRENT_WSTR (LC_TIME, _NL_WALT_DIGITS);
 233           size_t cnt;
 234
 235           for (cnt = 0; cnt < 100; ++cnt)
 236             {
 237               walt_digits[cnt] = ptr;
 238
 239               /* Skip digit format. */
 240               ptr = wcschr (ptr, L'\0') + 1;
 241             }
 242         }
 243     }
 244
 245   result = walt_digits != NULL && number < 100 ? walt_digits[number] : NULL;
 246
 247   __libc_lock_unlock (__libc_setlocale_lock);
 248
 249   return (wchar_t *) result;
 250 }
 251
 252
 253 static void
 254 free_mem (void)
 255 {
 256   free (alt_digits);
 257   free (walt_digits);
 258 }
 259 text_set_element (__libc_subfreeres, free_mem);