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: src/lib/libc/locale/fix_grouping.c,v 1.8 2003/06/26 10:46:16 phantom Exp $");
29
30#include <ctype.h>
31#include <limits.h>
32#include <stddef.h>
33
34static const char nogrouping[] = { '\0' };
35static const char __nogrouping[] = { CHAR_MAX, '\0' };
36
37/*
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"
42 */
43
44const char *
45__fix_locale_grouping_str(const char *str)
46{
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}
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}
99