1 /* $NetBSD: src/lib/libc/locale/wcstod.c,v 1.4 2001/10/28 12:08:43 yamt Exp $ */ 2 /* $DragonFly: src/lib/libc/locale/wcstod.c,v 1.1 2005/03/16 06:54:41 joerg Exp $ */ 3 4 /*- 5 * Copyright (c)1999, 2000, 2001 Citrus Project, 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstod.c,v 1.2 2001/09/27 16:23:57 yamt Exp $ 30 */ 31 32 #include <sys/cdefs.h> 33 #include <assert.h> 34 #include <errno.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <wchar.h> 38 #include <wctype.h> 39 40 #define _L(x) __CONCAT(L,x) 41 #define _LC(x) __CONCAT(L,x) 42 43 double 44 wcstod(const wchar_t *nptr, wchar_t **endptr) 45 { 46 const wchar_t *src; 47 size_t size; 48 const wchar_t *start; 49 50 _DIAGASSERT(nptr); 51 52 /* 53 * we do only check length of string 54 * and give it over strtod. 55 */ 56 src = nptr; 57 58 /* skip space first */ 59 while (iswspace(*src)) { 60 src++; 61 } 62 63 /* get length of string */ 64 start = src; 65 if (wcschr(_L("+-"), *src)) 66 src++; 67 size = wcsspn(src, _L("0123456789")); 68 src += size; 69 if (*src == _LC('.')) {/* XXX use localeconv */ 70 src++; 71 size = wcsspn(src, _L("0123456789")); 72 src += size; 73 } 74 if (wcschr(_L("Ee"), *src)) { 75 src++; 76 if (wcschr(_L("+-"), *src)) 77 src++; 78 size = wcsspn(src, _L("0123456789")); 79 src += size; 80 } 81 size = src - start; 82 83 /* 84 * convert to a char-string and pass it to strtod. 85 * 86 * since all chars used to represent a double-constant 87 * are in the portable character set, we can assume 88 * that they are 1-byte chars. 89 */ 90 if (size) 91 { 92 mbstate_t st; 93 char *buf; 94 char *end; 95 const wchar_t *s; 96 size_t size_converted; 97 double result; 98 99 buf = malloc(size + 1); 100 if (!buf) { 101 /* error */ 102 errno = ENOMEM; /* XXX */ 103 return 0; 104 } 105 106 s = start; 107 memset(&st, 0, sizeof(st)); 108 size_converted = wcsrtombs(buf, &s, size, &st); 109 if (size != size_converted) { 110 /* XXX should not happen */ 111 free(buf); 112 errno = EILSEQ; 113 return(0); 114 } 115 116 buf[size] = 0; 117 result = strtod(buf, &end); 118 119 free(buf); 120 121 if (endptr) 122 /* LINTED bad interface */ 123 *endptr = (wchar_t*)start + (end - buf); 124 125 return(result); 126 } 127 128 if (endptr) 129 /* LINTED bad interface */ 130 *endptr = (wchar_t*)start; 131 132 return(0); 133 } 134