fix_grouping.c revision 92986 
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: head/lib/libc/locale/fix_grouping.c 92986 2002-03-22 21:53:29Z obrien $");
29
30#include <ctype.h>
31#include <limits.h>
32#include <stddef.h>
33
34static const char nogrouping[] = { CHAR_MAX, '\0' };
35
36/*
37 * "3;3;-1" -> "\003\003\177"
38 */
39
40const char *
41__fix_locale_grouping_str(const char *str) {
42
43	char *src, *dst;
44	char n;
45
46	if (str == NULL || *str == '\0') {
47		return nogrouping;
48	}
49
50	for (src = (char*)str, dst = (char*)str; *src != '\0'; src++) {
51
52		/* input string examples: "3;3", "3;2;-1" */
53		if (*src == ';')
54			continue;
55
56		if (*src == '-' && *(src+1) == '1') {
57			*dst++ = CHAR_MAX;
58			src++;
59			continue;
60		}
61
62		if (!isdigit((unsigned char)*src)) {
63			/* broken grouping string */
64			return nogrouping;
65		}
66
67		/* assume all numbers <= 99 */
68		n = *src - '0';
69		if (isdigit((unsigned char)*(src+1))) {
70			src++;
71			n *= 10;
72			n += *src - '0';
73		}
74
75		*dst = n;
76		/* NOTE: assume all input started with "0" as 'no grouping' */
77		if (*dst == '\0')
78			return (dst == (char*)str) ? nogrouping : str;
79		dst++;
80	}
81	*dst = '\0';
82	return str;
83}
84