1/*-
2 * Copyright (c) 2002 Tim J. Robbins
3 * All rights reserved.
4 *
5 * Copyright (c) 2011 The FreeBSD Foundation
6 * All rights reserved.
7 * Portions of this software were developed by David Chisnall
8 * under sponsorship from the FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: stable/10/lib/libc/locale/wcstod.c 309334 2016-11-30 20:48:44Z vangyzen $");
34
35#include <stdlib.h>
36#include <wchar.h>
37#include <wctype.h>
38#include "xlocale_private.h"
39
40/*
41 * Convert a string to a double-precision number.
42 *
43 * This is the wide-character counterpart of strtod(). So that we do not
44 * have to duplicate the code of strtod() here, we convert the supplied
45 * wide character string to multibyte and call strtod() on the result.
46 * This assumes that the multibyte encoding is compatible with ASCII
47 * for at least the digits, radix character and letters.
48 */
49double
50wcstod_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
51		locale_t locale)
52{
53	static const mbstate_t initial;
54	mbstate_t mbs;
55	double val;
56	char *buf, *end;
57	const wchar_t *wcp;
58	size_t len;
59	size_t spaces;
60	FIX_LOCALE(locale);
61
62	wcp = nptr;
63	spaces = 0;
64	while (iswspace_l(*wcp, locale)) {
65		wcp++;
66		spaces++;
67	}
68
69	/*
70	 * Convert the supplied numeric wide char. string to multibyte.
71	 *
72	 * We could attempt to find the end of the numeric portion of the
73	 * wide char. string to avoid converting unneeded characters but
74	 * choose not to bother; optimising the uncommon case where
75	 * the input string contains a lot of text after the number
76	 * duplicates a lot of strtod()'s functionality and slows down the
77	 * most common cases.
78	 */
79	mbs = initial;
80	if ((len = wcsrtombs_l(NULL, &wcp, 0, &mbs, locale)) == (size_t)-1) {
81		if (endptr != NULL)
82			*endptr = (wchar_t *)nptr;
83		return (0.0);
84	}
85	if ((buf = malloc(len + 1)) == NULL) {
86		if (endptr != NULL)
87			*endptr = (wchar_t *)nptr;
88		return (0.0);
89	}
90	mbs = initial;
91	wcsrtombs_l(buf, &wcp, len + 1, &mbs, locale);
92
93	/* Let strtod() do most of the work for us. */
94	val = strtod_l(buf, &end, locale);
95
96	/*
97	 * We only know where the number ended in the _multibyte_
98	 * representation of the string. If the caller wants to know
99	 * where it ended, count multibyte characters to find the
100	 * corresponding position in the wide char string.
101	 */
102	if (endptr != NULL) {
103		*endptr = (wchar_t *)nptr + (end - buf);
104		if (buf != end)
105			*endptr += spaces;
106	}
107
108	free(buf);
109
110	return (val);
111}
112double
113wcstod(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr)
114{
115	return wcstod_l(nptr, endptr, __get_locale());
116}
117