lib/libc/locale/fix_grouping.c

   1 /* $NetBSD: fix_grouping.c,v 1.6 2012/03/21 14:11:24 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 1.6 2012/03/21 14:11:24 christos Exp $");
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 #include <limits.h>
  42 #include <stddef.h>
  43
  44 #include "fix_grouping.h"
  45
  46 #ifndef NBCHAR_MAX
  47 #define NBCHAR_MAX      (char)CHAR_MAX
  48 #endif
  49
  50 #ifndef __UNCONST
  51 #define __UNCONST(a)    ((void *)(unsigned long)(const void *)(a))
  52 #endif
  53
  54 static const char nogrouping[] = { NBCHAR_MAX, '\0' };
  55
  56 /* don't use libc's isdigit, it owes locale. */
  57 #define isdigit(c)      (c >= '0' && c <= '9')
  58
  59 /*
  60  * Internal helper used to convert grouping sequences from string
  61  * representation into POSIX specified form, i.e.
  62  *
  63  * "3;3;-1" -> "\003\003\177\000"
  64  */
  65
  66 const char *
  67 __fix_locale_grouping_str(const char *str)
  68 {
  69         char *src, *dst;
  70         char n;
  71
  72         if (str == NULL || *str == '\0') {
  73                 return nogrouping;
  74         }
  75
  76         for (src = __UNCONST(str), dst = __UNCONST(str); *src != '\0'; src++) {
  77
  78                 /* input string examples: "3;3", "3;2;-1" */
  79                 if (*src == ';')
  80                         continue;
  81
  82                 if (*src == '-' && *(src+1) == '1') {
  83                         *dst++ = NBCHAR_MAX;
  84                         src++;
  85                         continue;
  86                 }
  87
  88                 if (!isdigit((unsigned char)*src)) {
  89                         /* broken grouping string */
  90                         return nogrouping;
  91                 }
  92
  93                 /* assume all numbers <= 99 */
  94                 n = *src - '0';
  95                 if (isdigit((unsigned char)*(src+1))) {
  96                         src++;
  97                         n *= 10;
  98                         n += *src - '0';
  99                 }
 100
 101                 *dst = n;
 102                 /* NOTE: assume all input started with "0" as 'no grouping' */
 103                 if (*dst == '\0')
 104                         return (dst == __UNCONST(str)) ? nogrouping : str;
 105                 dst++;
 106         }
 107         *dst = '\0';
 108         return str;
 109 }