1/*
2 * Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org>
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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <ctype.h>
31#include <limits.h>
32#include <stddef.h>
33
34static const char nogrouping[] = { CHAR_MAX, '\0' };
35
36/*
37 * Internal helper used to convert grouping sequences from string
38 * representation into POSIX specified form, i.e.
39 *
40 * "3;3;-1" -> "\003\003\177\000"
41 */
42
43const char *
44__fix_locale_grouping_str(const char *str)
45{
46	char *src, *dst;
47	char n;
48
49	if (str == NULL || *str == '\0') {
50		return nogrouping;
51	}
52
53	for (src = (char*)str, dst = (char*)str; *src != '\0'; src++) {
54
55		/* input string examples: "3;3", "3;2;-1" */
56		if (*src == ';')
57			continue;
58
59		if (*src == '-' && *(src+1) == '1') {
60			*dst++ = CHAR_MAX;
61			src++;
62			continue;
63		}
64
65		if (!isdigit((unsigned char)*src)) {
66			/* broken grouping string */
67			return nogrouping;
68		}
69
70		/* assume all numbers <= 99 */
71		n = *src - '0';
72		if (isdigit((unsigned char)*(src+1))) {
73			src++;
74			n *= 10;
75			n += *src - '0';
76		}
77
78		*dst = n;
79		/* NOTE: assume all input started with "0" as 'no grouping' */
80		if (*dst == '\0')
81			return (dst == (char*)str) ? nogrouping : str;
82		dst++;
83	}
84	*dst = '\0';
85	return str;
86}
87