2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2002 Tim J. Robbins
7 * Copyright (c) 2011 The FreeBSD Foundation
9 * Portions of this software were developed by David Chisnall
10 * under sponsorship from the FreeBSD Foundation.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
40 #include "xlocale_private.h"
43 * Convert a string to a double-precision number.
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.
52 wcstod_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
55 static const mbstate_t initial;
66 while (iswspace_l(*wcp, locale)) {
72 * Convert the supplied numeric wide char. string to multibyte.
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
82 if ((len = wcsrtombs_l(NULL, &wcp, 0, &mbs, locale)) == (size_t)-1) {
84 *endptr = (wchar_t *)nptr;
87 if ((buf = malloc(len + 1)) == NULL) {
89 *endptr = (wchar_t *)nptr;
93 wcsrtombs_l(buf, &wcp, len + 1, &mbs, locale);
95 /* Let strtod() do most of the work for us. */
96 val = strtod_l(buf, &end, locale);
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.
104 if (endptr != NULL) {
105 *endptr = (wchar_t *)nptr + (end - buf);
115 wcstod(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr)
117 return wcstod_l(nptr, endptr, __get_locale());