1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2002 Tim J. Robbins 5 * All rights reserved. 6 * 7 * Copyright (c) 2011 The FreeBSD Foundation 8 * 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 <stdlib.h> 35 #include <wchar.h> 36 #include <wctype.h> 37 #include "xlocale_private.h" 38 39 /* 40 * Convert a string to a double-precision number. 41 * 42 * This is the wide-character counterpart of strtod(). So that we do not 43 * have to duplicate the code of strtod() here, we convert the supplied 44 * wide character string to multibyte and call strtod() on the result. 45 * This assumes that the multibyte encoding is compatible with ASCII 46 * for at least the digits, radix character and letters. 47 */ 48 double 49 wcstod_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, 50 locale_t locale) 51 { 52 static const mbstate_t initial; 53 mbstate_t mbs; 54 double val; 55 char *buf, *end; 56 const wchar_t *wcp; 57 size_t len; 58 size_t spaces; 59 FIX_LOCALE(locale); 60 61 wcp = nptr; 62 spaces = 0; 63 while (iswspace_l(*wcp, locale)) { 64 wcp++; 65 spaces++; 66 } 67 68 /* 69 * Convert the supplied numeric wide char. string to multibyte. 70 * 71 * We could attempt to find the end of the numeric portion of the 72 * wide char. string to avoid converting unneeded characters but 73 * choose not to bother; optimising the uncommon case where 74 * the input string contains a lot of text after the number 75 * duplicates a lot of strtod()'s functionality and slows down the 76 * most common cases. 77 */ 78 mbs = initial; 79 if ((len = wcsrtombs_l(NULL, &wcp, 0, &mbs, locale)) == (size_t)-1) { 80 if (endptr != NULL) 81 *endptr = (wchar_t *)nptr; 82 return (0.0); 83 } 84 if ((buf = malloc(len + 1)) == NULL) { 85 if (endptr != NULL) 86 *endptr = (wchar_t *)nptr; 87 return (0.0); 88 } 89 mbs = initial; 90 wcsrtombs_l(buf, &wcp, len + 1, &mbs, locale); 91 92 /* Let strtod() do most of the work for us. */ 93 val = strtod_l(buf, &end, locale); 94 95 /* 96 * We only know where the number ended in the _multibyte_ 97 * representation of the string. If the caller wants to know 98 * where it ended, count multibyte characters to find the 99 * corresponding position in the wide char string. 100 */ 101 if (endptr != NULL) { 102 *endptr = (wchar_t *)nptr + (end - buf); 103 if (buf != end) 104 *endptr += spaces; 105 } 106 107 free(buf); 108 109 return (val); 110 } 111 double 112 wcstod(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr) 113 { 114 return wcstod_l(nptr, endptr, __get_locale()); 115 } 116