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 * $FreeBSD: head/lib/libc/locale/wcstod.c 326193 2017-11-25 17:12:48Z pfg $ 32 */ 33 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 */ 49 double 50 wcstod_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 } 112 double 113 wcstod(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr) 114 { 115 return wcstod_l(nptr, endptr, __get_locale()); 116 } 117