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("$FreeBSD$");
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 = nptr;
58	size_t len;
59	size_t spaces = 0;
60	FIX_LOCALE(locale);
61
62	while (iswspace_l(*wcp, locale)) {
63		wcp++;
64		spaces++;
65	}
66
67	/*
68	 * Convert the supplied numeric wide char. string to multibyte.
69	 *
70	 * We could attempt to find the end of the numeric portion of the
71	 * wide char. string to avoid converting unneeded characters but
72	 * choose not to bother; optimising the uncommon case where
73	 * the input string contains a lot of text after the number
74	 * duplicates a lot of strtod()'s functionality and slows down the
75	 * most common cases.
76	 */
77	mbs = initial;
78	if ((len = wcsrtombs_l(NULL, &wcp, 0, &mbs, locale)) == (size_t)-1) {
79		if (endptr != NULL)
80			*endptr = (wchar_t *)nptr;
81		return (0.0);
82	}
83	if ((buf = malloc(len + 1)) == NULL)
84		return (0.0);
85	mbs = initial;
86	wcsrtombs_l(buf, &wcp, len + 1, &mbs, locale);
87
88	/* Let strtod() do most of the work for us. */
89	val = strtod_l(buf, &end, locale);
90
91	/*
92	 * We only know where the number ended in the _multibyte_
93	 * representation of the string. If the caller wants to know
94	 * where it ended, count multibyte characters to find the
95	 * corresponding position in the wide char string.
96	 */
97	if (endptr != NULL) {
98		/* XXX Assume each wide char is one byte. */
99		*endptr = (wchar_t *)nptr + (end - buf);
100		if (buf != end)
101			*endptr += spaces;
102	}
103
104
105	free(buf);
106
107	return (val);
108}
109double
110wcstod(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr)
111{
112	return wcstod_l(nptr, endptr, __get_locale());
113}
114