1/* $NetBSD: fix_grouping.c,v 1.7 2024/06/07 13:53:12 riastradh Exp $ */
2
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 * Original version ID:
29 *     FreeBSD: fix_grouping.c,v 1.8 2003/06/26 10:46:16 phantom Exp
30 */
31
32#if HAVE_NBTOOL_CONFIG_H
33#include "nbtool_config.h"
34#endif
35
36#include <sys/cdefs.h>
37#if defined(LIBC_SCCS) && !defined(lint)
38__RCSID("$NetBSD: fix_grouping.c,v 1.7 2024/06/07 13:53:12 riastradh Exp $");
39#endif /* LIBC_SCCS and not lint */
40
41#include <limits.h>
42#include <stddef.h>
43
44#include "fix_grouping.h"
45
46#ifndef NBCHAR_MAX
47#define NBCHAR_MAX	CHAR_MAX
48#endif
49
50#ifndef __UNCONST
51#define __UNCONST(a)    ((void *)(unsigned long)(const void *)(a))
52#endif
53
54static const char nogrouping[] = { NBCHAR_MAX, '\0' };
55
56/* don't use libc's isdigit, it owes locale. */
57#define isdigit(c)	(c >= '0' && c <= '9')
58
59/*
60 * Internal helper used to convert grouping sequences from string
61 * representation into POSIX specified form, i.e.
62 *
63 * "3;3;-1" -> "\003\003\177\000"
64 */
65
66const char *
67__fix_locale_grouping_str(const char *str)
68{
69	char *src, *dst;
70	char n;
71
72	if (str == NULL || *str == '\0') {
73		return nogrouping;
74	}
75
76	for (src = __UNCONST(str), dst = __UNCONST(str); *src != '\0'; src++) {
77
78		/* input string examples: "3;3", "3;2;-1" */
79		if (*src == ';')
80			continue;
81
82		if (*src == '-' && *(src+1) == '1') {
83			*dst++ = NBCHAR_MAX;
84			src++;
85			continue;
86		}
87
88		if (!isdigit((unsigned char)*src)) {
89			/* broken grouping string */
90			return nogrouping;
91		}
92
93		/* assume all numbers <= 99 */
94		n = *src - '0';
95		if (isdigit((unsigned char)*(src+1))) {
96			src++;
97			n *= 10;
98			n += *src - '0';
99		}
100
101		*dst = n;
102		/* NOTE: assume all input started with "0" as 'no grouping' */
103		if (*dst == '\0')
104			return (dst == __UNCONST(str)) ? nogrouping : str;
105		dst++;
106	}
107	*dst = '\0';
108	return str;
109}
110