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