1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2002 Tim J. Robbins
5 * All rights reserved.
6 *
7 * Copyright (c) 2011 The FreeBSD Foundation
8 * All rights reserved.
9 * Portions of this software were developed by David Chisnall
10 * under sponsorship from the FreeBSD Foundation.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD$");
36
37#include <stdlib.h>
38#include <wchar.h>
39#include <wctype.h>
40#include "xlocale_private.h"
41
42/*
43 * Convert a string to a double-precision number.
44 *
45 * This is the wide-character counterpart of strtod(). So that we do not
46 * have to duplicate the code of strtod() here, we convert the supplied
47 * wide character string to multibyte and call strtod() on the result.
48 * This assumes that the multibyte encoding is compatible with ASCII
49 * for at least the digits, radix character and letters.
50 */
51double
52wcstod_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
53		locale_t locale)
54{
55	static const mbstate_t initial;
56	mbstate_t mbs;
57	double val;
58	char *buf, *end;
59	const wchar_t *wcp;
60	size_t len;
61	size_t spaces;
62	FIX_LOCALE(locale);
63
64	wcp = nptr;
65	spaces = 0;
66	while (iswspace_l(*wcp, locale)) {
67		wcp++;
68		spaces++;
69	}
70
71	/*
72	 * Convert the supplied numeric wide char. string to multibyte.
73	 *
74	 * We could attempt to find the end of the numeric portion of the
75	 * wide char. string to avoid converting unneeded characters but
76	 * choose not to bother; optimising the uncommon case where
77	 * the input string contains a lot of text after the number
78	 * duplicates a lot of strtod()'s functionality and slows down the
79	 * most common cases.
80	 */
81	mbs = initial;
82	if ((len = wcsrtombs_l(NULL, &wcp, 0, &mbs, locale)) == (size_t)-1) {
83		if (endptr != NULL)
84			*endptr = (wchar_t *)nptr;
85		return (0.0);
86	}
87	if ((buf = malloc(len + 1)) == NULL) {
88		if (endptr != NULL)
89			*endptr = (wchar_t *)nptr;
90		return (0.0);
91	}
92	mbs = initial;
93	wcsrtombs_l(buf, &wcp, len + 1, &mbs, locale);
94
95	/* Let strtod() do most of the work for us. */
96	val = strtod_l(buf, &end, locale);
97
98	/*
99	 * We only know where the number ended in the _multibyte_
100	 * representation of the string. If the caller wants to know
101	 * where it ended, count multibyte characters to find the
102	 * corresponding position in the wide char string.
103	 */
104	if (endptr != NULL) {
105		*endptr = (wchar_t *)nptr + (end - buf);
106		if (buf != end)
107			*endptr += spaces;
108	}
109
110	free(buf);
111
112	return (val);
113}
114double
115wcstod(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr)
116{
117	return wcstod_l(nptr, endptr, __get_locale());
118}
119