wcstold.c revision 331722 
1/*-
2 * Copyright (c) 2002, 2003 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/11/lib/libc/locale/wcstold.c 331722 2018-03-29 02:50:57Z eadler $");
34
35#include <stdlib.h>
36#include <wchar.h>
37#include <wctype.h>
38#include "xlocale_private.h"
39
40/*
41 * See wcstod() for comments as to the logic used.
42 */
43long double
44wcstold_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
45		locale_t locale)
46{
47	static const mbstate_t initial;
48	mbstate_t mbs;
49	long double val;
50	char *buf, *end;
51	const wchar_t *wcp;
52	size_t len;
53	size_t spaces;
54	FIX_LOCALE(locale);
55
56	wcp = nptr;
57	spaces = 0;
58	while (iswspace_l(*wcp, locale)) {
59		wcp++;
60		spaces++;
61	}
62
63	mbs = initial;
64	if ((len = wcsrtombs_l(NULL, &wcp, 0, &mbs, locale)) == (size_t)-1) {
65		if (endptr != NULL)
66			*endptr = (wchar_t *)nptr;
67		return (0.0);
68	}
69	if ((buf = malloc(len + 1)) == NULL) {
70		if (endptr != NULL)
71			*endptr = (wchar_t *)nptr;
72		return (0.0);
73	}
74	mbs = initial;
75	wcsrtombs_l(buf, &wcp, len + 1, &mbs, locale);
76
77	val = strtold_l(buf, &end, locale);
78
79	if (endptr != NULL) {
80		*endptr = (wchar_t *)nptr + (end - buf);
81		if (buf != end)
82			*endptr += spaces;
83	}
84
85	free(buf);
86
87	return (val);
88}
89long double
90wcstold(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr)
91{
92	return wcstold_l(nptr, endptr, __get_locale());
93}
94