locale/FreeBSD/fix_grouping.c

   1 /*
   2  * Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD: src/lib/libc/locale/fix_grouping.c,v 1.7 2002/03/22 21:52:18 obrien Exp $");
  29
  30 #include <ctype.h>
  31 #include <limits.h>
  32 #include <stddef.h>
  33
  34 static const char nogrouping[] = { CHAR_MAX, '\0' };
  35
  36 /*
  37  * "3;3;-1" -> "\003\003\177"
  38  */
  39
  40 const char *
  41 __fix_locale_grouping_str(const char *str) {
  42
  43         char *src, *dst;
  44         char n;
  45
  46         if (str == NULL || *str == '\0') {
  47                 return nogrouping;
  48         }
  49
  50         for (src = (char*)str, dst = (char*)str; *src != '\0'; src++) {
  51
  52                 /* input string examples: "3;3", "3;2;-1" */
  53                 if (*src == ';')
  54                         continue;
  55
  56                 if (*src == '-' && *(src+1) == '1') {
  57                         *dst++ = CHAR_MAX;
  58                         src++;
  59                         continue;
  60                 }
  61
  62                 if (!isdigit((unsigned char)*src)) {
  63                         /* broken grouping string */
  64                         return nogrouping;
  65                 }
  66
  67                 /* assume all numbers <= 99 */
  68                 n = *src - '0';
  69                 if (isdigit((unsigned char)*(src+1))) {
  70                         src++;
  71                         n *= 10;
  72                         n += *src - '0';
  73                 }
  74
  75                 *dst = n;
  76                 /* NOTE: assume all input started with "0" as 'no grouping' */
  77                 if (*dst == '\0')
  78                         return (dst == (char*)str) ? nogrouping : str;
  79                 dst++;
  80         }
  81         *dst = '\0';
  82         return str;
  83 }