[apple/libc.git] / locale / FreeBSD / fix_grouping.c

/*
 * 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/locale/fix_grouping.c,v 1.8 2003/06/26 10:46:16 phantom Exp $");

#include <ctype.h>
#include <limits.h>
#include <stddef.h>

static const char nogrouping[] = { '\0' };
static const char __nogrouping[] = { CHAR_MAX, '\0' };

/*
 * 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 = (char*)str, dst = (char*)str; *src != '\0'; src++) {

		/* input string examples: "3;3", "3;2;-1" */
		if (*src == ';')
			continue;
	
		if (*src == '-' && *(src+1) == '1') {
			*dst++ = CHAR_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 == (char*)str) ? nogrouping : str;
		dst++;
	}
	*dst = '\0';
	return str;
}

/*
 * internal helpers for SUSv3 compatibility.  Since "nogrouping" needs to
 * be just an empty string, we provide a routine to substitute __nogrouping
 * so we don't have to modify code that expects CHAR_MAX.
 */
__private_extern__ const char *
__fix_nogrouping(const char *str)
{
	return ((str == NULL || *str == '\0') ? __nogrouping : str);
}
Commit	Line	Data
9385eb3d A	1	/*
9385eb3d A	2	* Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org>
5b2abdfb A	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.
5b2abdfb A	25	*/
5b2abdfb A	26
9385eb3d	27	#include <sys/cdefs.h>
3d9156a7	28	__FBSDID("$FreeBSD: src/lib/libc/locale/fix_grouping.c,v 1.8 2003/06/26 10:46:16 phantom Exp $");
9385eb3d A	29
	30	#include <ctype.h>
	31	#include <limits.h>
	32	#include <stddef.h>
	33
ad3c9f2a A	34	static const char nogrouping[] = { '\0' };
ad3c9f2a A	35	static const char __nogrouping[] = { CHAR_MAX, '\0' };
9385eb3d	36
5b2abdfb	37	/*
3d9156a7 A	38	* Internal helper used to convert grouping sequences from string
	39	* representation into POSIX specified form, i.e.
	40	*
	41	* "3;3;-1" -> "\003\003\177\000"
5b2abdfb	42	*/
5b2abdfb	43
9385eb3d	44	const char *
3d9156a7 A	45	__fix_locale_grouping_str(const char *str)
3d9156a7 A	46	{
9385eb3d A	47	char src, dst;
	48	char n;
	49
	50	if (str == NULL \|\| *str == '\0') {
	51	return nogrouping;
	52	}
	53
	54	for (src = (char)str, dst = (char)str; *src != '\0'; src++) {
	55
	56	/* input string examples: "3;3", "3;2;-1" */
	57	if (*src == ';')
	58	continue;
	59
	60	if (src == '-' && (src+1) == '1') {
	61	*dst++ = CHAR_MAX;
	62	src++;
	63	continue;
	64	}
	65
	66	if (!isdigit((unsigned char)*src)) {
	67	/* broken grouping string */
	68	return nogrouping;
	69	}
	70
	71	/* assume all numbers <= 99 */
	72	n = *src - '0';
	73	if (isdigit((unsigned char)*(src+1))) {
	74	src++;
	75	n *= 10;
	76	n += *src - '0';
	77	}
	78
	79	*dst = n;
	80	/* NOTE: assume all input started with "0" as 'no grouping' */
	81	if (*dst == '\0')
	82	return (dst == (char*)str) ? nogrouping : str;
	83	dst++;
	84	}
	85	*dst = '\0';
	86	return str;
	87	}
ad3c9f2a A	88
	89	/*
	90	* internal helpers for SUSv3 compatibility. Since "nogrouping" needs to
	91	* be just an empty string, we provide a routine to substitute __nogrouping
	92	* so we don't have to modify code that expects CHAR_MAX.
	93	*/
	94	__private_extern__ const char *
	95	__fix_nogrouping(const char *str)
	96	{
	97	return ((str == NULL \|\| *str == '\0') ? __nogrouping : str);
	98	}