lib/libc/locale/fix_grouping.c

   1 /* $NetBSD: fix_grouping.c,v 1.1.2.3 2009/01/10 22:59:51 christos Exp $ */
   2
   3 /*
   4  * Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * Original version ID:
  29  *     FreeBSD: fix_grouping.c,v 1.8 2003/06/26 10:46:16 phantom Exp
  30  */
  31
  32 #if HAVE_NBTOOL_CONFIG_H
  33 #include "nbtool_config.h"
  34 #endif
  35
  36 #include <sys/cdefs.h>
  37 #if defined(LIBC_SCCS) && !defined(lint)
  38 __RCSID("$NetBSD: fix_grouping.c,v 1.1.2.3 2009/01/10 22:59:51 christos Exp $");
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 #include <ctype.h>
  42 #include <limits.h>
  43 #include <stddef.h>
  44
  45 #include "fix_grouping.h"
  46
  47 #ifndef NBCHAR_MAX
  48 #define NBCHAR_MAX      CHAR_MAX
  49 #endif
  50
  51 #ifndef __UNCONST
  52 #define __UNCONST(a)    ((void *)(unsigned long)(const void *)(a))
  53 #endif
  54
  55 static const char nogrouping[] = { NBCHAR_MAX, '\0' };
  56
  57 /* don't use libc's isdigit, it owes locale. */
  58 #undef isdigit
  59 #define isdigit(c)      (c >= '0' && c <= '9')
  60
  61 /*
  62  * Internal helper used to convert grouping sequences from string
  63  * representation into POSIX specified form, i.e.
  64  *
  65  * "3;3;-1" -> "\003\003\177\000"
  66  */
  67
  68 const char *
  69 __fix_locale_grouping_str(const char *str)
  70 {
  71         char *src, *dst;
  72         char n;
  73
  74         if (str == NULL || *str == '\0') {
  75                 return nogrouping;
  76         }
  77
  78         for (src = __UNCONST(str), dst = __UNCONST(str); *src != '\0'; src++) {
  79
  80                 /* input string examples: "3;3", "3;2;-1" */
  81                 if (*src == ';')
  82                         continue;
  83
  84                 if (*src == '-' && *(src+1) == '1') {
  85                         *dst++ = NBCHAR_MAX;
  86                         src++;
  87                         continue;
  88                 }
  89
  90                 if (!isdigit((unsigned char)*src)) {
  91                         /* broken grouping string */
  92                         return nogrouping;
  93                 }
  94
  95                 /* assume all numbers <= 99 */
  96                 n = *src - '0';
  97                 if (isdigit((unsigned char)*(src+1))) {
  98                         src++;
  99                         n *= 10;
 100                         n += *src - '0';
 101                 }
 102
 103                 *dst = n;
 104                 /* NOTE: assume all input started with "0" as 'no grouping' */
 105                 if (*dst == '\0')
 106                         return (dst == __UNCONST(str)) ? nogrouping : str;
 107                 dst++;
 108         }
 109         *dst = '\0';
 110         return str;
 111 }