locale/programs/charset.c

   1 /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
   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 #ifdef HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include <alloca.h>
  25 #include <ctype.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "error.h"
  31 #include "charset.h"
  32
  33
  34 static void
  35 insert_char (struct linereader *lr, struct charset_t *cs, int bytes,
  36              unsigned int value, const char *from, const char *to);
  37
  38
  39 void
  40 charset_new_char (struct linereader *lr, struct charset_t *cs, int bytes,
  41                   unsigned int value, const char *from, const char *to)
  42 {
  43   if (bytes < cs->mb_cur_min)
  44     lr_error (lr, _("too few bytes in character encoding"));
  45   else if (bytes > cs->mb_cur_max)
  46     lr_error (lr, _("too many bytes in character encoding"));
  47   else
  48     insert_char (lr, cs, bytes, value, from, to);
  49 }
  50
  51
  52 void
  53 charset_new_unicode (struct linereader *lr, struct charset_t *cs, int bytes,
  54                      unsigned int value, const char *from, const char *to)
  55 {
  56   /* For now: perhaps <Uxxxx> support will be removed again... */
  57   insert_char (lr, cs, bytes, value, from, to);
  58 }
  59
  60
  61 unsigned int
  62 charset_find_value (const struct charset_t *cs, const char *name, size_t len)
  63 {
  64   void *result;
  65
  66   if (find_entry ((hash_table *) &cs->char_table, name, len, &result) < 0)
  67     return ILLEGAL_CHAR_VALUE;
  68
  69   return (unsigned int) ((unsigned long int) result);
  70 }
  71
  72
  73 static void
  74 insert_char (struct linereader *lr, struct charset_t *cs, int bytes,
  75              unsigned int value, const char *from, const char *to)
  76 {
  77   const char *cp;
  78   char *buf;
  79   int prefix_len, len1, len2;
  80   unsigned int from_nr, to_nr, cnt;
  81
  82   if (to == NULL)
  83     {
  84       if (insert_entry (&cs->char_table, from, strlen (from),
  85                         (void *) (unsigned long int) value)
  86           < 0)
  87         lr_error (lr, _("duplicate character name `%s'"), from);
  88
  89       return;
  90     }
  91
  92   /* We have a range: the names must have names with equal prefixes
  93      and an equal number of digits, where the second number is greater
  94      or equal than the first.  */
  95   len1 = strlen (from);
  96   len2 = strlen (to);
  97
  98   if (len1 != len2)
  99     {
 100     illegal_range:
 101       lr_error (lr, _("illegal names for character range"));
 102       return;
 103     }
 104
 105   cp = &from[len1 - 1];
 106   while (isdigit (*cp) && cp >= from)
 107     --cp;
 108
 109   prefix_len = (cp - from) + 1;
 110
 111   if (cp == &from[len1 - 1] || strncmp (from, to, prefix_len) != 0)
 112     goto illegal_range;
 113
 114   from_nr = strtoul (&from[prefix_len], NULL, 10);
 115   to_nr = strtoul (&to[prefix_len], NULL, 10);
 116
 117   if (from_nr > to_nr)
 118     {
 119       lr_error (lr, _("upper limit in range is not smaller then lower limit"));
 120       return;
 121     }
 122
 123   buf = alloca (len1 + 1);
 124   memcpy (buf, from, prefix_len);
 125
 126   for (cnt = from_nr; cnt <= to_nr; ++cnt)
 127     {
 128       sprintf (&buf[prefix_len], "%0d", cnt);
 129
 130       if (insert_entry (&cs->char_table, buf, len1,
 131                         (void *) (unsigned long int) cnt) < 0)
 132         lr_error (lr, _("duplicate character name `%s'"), buf);
 133     }
 134 }