minix/lib/libc/locale/fix_grouping.c

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/* $NetBSD: fix_grouping.c,v 1.6 2012/03/21 14:11:24 christos Exp $ */
/*
* Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Original version ID:
* FreeBSD: fix_grouping.c,v 1.8 2003/06/26 10:46:16 phantom Exp
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: fix_grouping.c,v 1.6 2012/03/21 14:11:24 christos Exp $");
#endif /* LIBC_SCCS and not lint */
#include <limits.h>
#include <stddef.h>
#include "fix_grouping.h"
#ifndef NBCHAR_MAX
#define NBCHAR_MAX (char)CHAR_MAX
#endif
#ifndef __UNCONST
#define __UNCONST(a) ((void *)(unsigned long)(const void *)(a))
#endif
static const char nogrouping[] = { NBCHAR_MAX, '\0' };
/* don't use libc's isdigit, it owes locale. */
#define isdigit(c) (c >= '0' && c <= '9')
/*
* Internal helper used to convert grouping sequences from string
* representation into POSIX specified form, i.e.
*
* "3;3;-1" -> "\003\003\177\000"
*/
const char *
__fix_locale_grouping_str(const char *str)
{
char *src, *dst;
char n;
if (str == NULL || *str == '\0') {
return nogrouping;
}
for (src = __UNCONST(str), dst = __UNCONST(str); *src != '\0'; src++) {
/* input string examples: "3;3", "3;2;-1" */
if (*src == ';')
continue;
if (*src == '-' && *(src+1) == '1') {
*dst++ = NBCHAR_MAX;
src++;
continue;
}
if (!isdigit((unsigned char)*src)) {
/* broken grouping string */
return nogrouping;
}
/* assume all numbers <= 99 */
n = *src - '0';
if (isdigit((unsigned char)*(src+1))) {
src++;
n *= 10;
n += *src - '0';
}
*dst = n;
/* NOTE: assume all input started with "0" as 'no grouping' */
if (*dst == '\0')
return (dst == __UNCONST(str)) ? nogrouping : str;
dst++;
}
*dst = '\0';
return str;
}