libc: Fix some more -Wmissing-prototype.
[dragonfly.git] / lib / libc / locale / fix_grouping.c
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1/*
2 * Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org>
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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.
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25 *
26 * $FreeBSD: head/lib/libc/locale/fix_grouping.c 116875 2003-06-26 10:46:16Z phantom $
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27 */
28
0d5acd74 29#include <ctype.h>
9cb03a6a 30#include <limits.h>
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31#include <stddef.h>
32
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33const char *__fix_locale_grouping_str(const char *);
34
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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 }
9cb03a6a 78
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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}