fix_grouping.c revision 72407 
1/*
2 * Copyright (c) 2001 Alexey Zelkin
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 * $FreeBSD: head/lib/libc/locale/fix_grouping.c 72407 2001-02-12 08:55:12Z phantom $
27 */
28
29#include <ctype.h>
30#include <limits.h>
31#include <stddef.h>
32
33static const char nogrouping[] = { CHAR_MAX, '\0' };
34
35/*
36 * "3;3;-1" -> "\003\003\177"
37 */
38
39const char *
40__fix_locale_grouping_str(const char *str) {
41
42	char *src, *dst;
43	char n;
44
45	if (str == NULL || *str == '\0') {
46		return nogrouping;
47	}
48
49	for (src = (char*)str, dst = (char*)str; *src != '\0'; src++) {
50
51		/* input string examples: "3;3", "3;2;-1" */
52		if (*src == ';')
53			continue;
54
55		if (*src == '-' && *(src+1) == '1') {
56			*dst++ = CHAR_MAX;
57			src++;
58			continue;
59		}
60
61		if (!isdigit((unsigned char)*src)) {
62			/* broken grouping string */
63			return nogrouping;
64		}
65
66		for (n = 0; isdigit((unsigned char)*src); src++) {
67			n *= 10;
68			n += *src - '0';
69		}
70
71		*dst++ = n;
72	}
73	*dst = '\0';
74	return str;
75}
76