1/*-
2 * Copyright (c) 2002 Tim J. Robbins
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: src/lib/libc/locale/wcstod.c,v 1.4 2004/04/07 09:47:56 tjr Exp $");
29
30#include "xlocale_private.h"
31
32#include <stdlib.h>
33#include <wchar.h>
34#include <wctype.h>
35#include <_simple.h>
36
37/*
38 * __wcs_end_offset calculates the offset to the end within the wide character
39 * string, assuming numbers and letters are single bytes in multibyte
40 * representation, get the actual decimal string for localeconv_l.  If the
41 * decimal point was within the string, compensate for the fact that the
42 * (possible more than one byte) decimal point one takes one wide character.
43 */
44__private_extern__ size_t
45__wcs_end_offset(const char * __restrict buf, const char * __restrict end, locale_t loc)
46{
47	const char *decimalpoint = localeconv_l(loc)->decimal_point;
48	size_t n = end - buf;
49	char *p;
50
51	if ((p = strnstr(buf, decimalpoint, n)) != NULL)
52		n -= strlen(decimalpoint) - 1;
53	return n;
54}
55
56/*
57 * Convert a string to a double-precision number.
58 *
59 * This is the wide-character counterpart of strtod(). So that we do not
60 * have to duplicate the code of strtod() here, we convert the supplied
61 * wide character string to multibyte and call strtod() on the result.
62 * This assumes that the multibyte encoding is compatible with ASCII
63 * for at least the digits and letters.  The radix character can be more
64 * than one byte.
65 */
66
67double
68wcstod_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
69    locale_t loc)
70{
71	static const mbstate_t initial;
72	mbstate_t mbs;
73	double val;
74	char *buf, *end;
75	size_t len;
76	locale_t ctype;
77	_SIMPLE_STRING b;
78	char mb[MB_CUR_MAX + 1];
79	const wchar_t *nptr0 = nptr;
80	const wchar_t *first;
81
82	NORMALIZE_LOCALE(loc);
83	ctype = __numeric_ctype(loc);
84
85	while (iswspace_l(*nptr, ctype))
86		nptr++;
87
88	if ((b = _simple_salloc()) == NULL)
89		return (0.0);
90
91	first = nptr;
92	mbs = initial;
93	while (*nptr && (len = wcrtomb_l(mb, *nptr, &mbs, ctype)) != (size_t)-1) {
94		mb[len] = 0;
95		if (_simple_sappend(b, mb) < 0) { /* no memory */
96			_simple_sfree(b);
97			return (0.0);
98		}
99		nptr++;
100	}
101
102	/* Let strtod() do most of the work for us. */
103	buf = _simple_string(b);
104	val = strtod_l(buf, &end, loc);
105
106	/*
107	 * We only know where the number ended in the _multibyte_
108	 * representation of the string. If the caller wants to know
109	 * where it ended, count multibyte characters to find the
110	 * corresponding position in the wide char string.
111	 */
112	if (endptr != NULL)
113		/* XXX Assume each wide char is one byte. */
114		*endptr = (end == buf) ? (wchar_t *)nptr0 : ((wchar_t *)first + __wcs_end_offset(buf, end, loc));
115
116	_simple_sfree(b);
117
118	return (val);
119}
120
121double
122wcstod(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr)
123{
124	return wcstod_l(nptr, endptr, __current_locale());
125}
126