fix_grouping.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: stable/11/lib/libc/locale/fix_grouping.c 330897 2018-03-14 03:19:51Z eadler $");
31
32#include <ctype.h>
33#include <limits.h>
34#include <stddef.h>
35
36static const char nogrouping[] = { CHAR_MAX, '\0' };
37
38/*
39 * Internal helper used to convert grouping sequences from string
40 * representation into POSIX specified form, i.e.
41 *
42 * "3;3;-1" -> "\003\003\177\000"
43 */
44
45const char *
46__fix_locale_grouping_str(const char *str)
47{
48	char *src, *dst;
49	char n;
50
51	if (str == NULL || *str == '\0') {
52		return nogrouping;
53	}
54
55	for (src = (char*)str, dst = (char*)str; *src != '\0'; src++) {
56
57		/* input string examples: "3;3", "3;2;-1" */
58		if (*src == ';')
59			continue;
60
61		if (*src == '-' && *(src+1) == '1') {
62			*dst++ = CHAR_MAX;
63			src++;
64			continue;
65		}
66
67		if (!isdigit((unsigned char)*src)) {
68			/* broken grouping string */
69			return nogrouping;
70		}
71
72		/* assume all numbers <= 99 */
73		n = *src - '0';
74		if (isdigit((unsigned char)*(src+1))) {
75			src++;
76			n *= 10;
77			n += *src - '0';
78		}
79
80		*dst = n;
81		/* NOTE: assume all input started with "0" as 'no grouping' */
82		if (*dst == '\0')
83			return (dst == (char*)str) ? nogrouping : str;
84		dst++;
85	}
86	*dst = '\0';
87	return str;
88}
89