1 /* $NetBSD: wcstod.c,v 1.6 2005/11/29 03:11:59 christos Exp $ */ 2 3 /*- 4 * Copyright (c)1999, 2000, 2001 Citrus Project, 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstod.c,v 1.2 2001/09/27 16:23:57 yamt Exp $ 29 */ 30 31 #include <sys/cdefs.h> 32 #if defined(LIBC_SCCS) && !defined(lint) 33 __RCSID("$NetBSD: wcstod.c,v 1.6 2005/11/29 03:11:59 christos Exp $"); 34 #endif /* LIBC_SCCS and not lint */ 35 36 #include <assert.h> 37 #include <errno.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <wchar.h> 41 #include <wctype.h> 42 43 #define _L(x) __CONCAT(L,x) 44 #define _LC(x) __CONCAT(L,x) 45 46 double 47 wcstod(const wchar_t *nptr, wchar_t **endptr) 48 { 49 const wchar_t *src; 50 size_t size; 51 const wchar_t *start; 52 53 _DIAGASSERT(nptr); 54 55 /* 56 * we do only check length of string 57 * and give it over strtod. 58 */ 59 src = nptr; 60 61 /* skip space first */ 62 while (iswspace(*src)) { 63 src++; 64 } 65 66 /* get length of string */ 67 start = src; 68 if (wcschr(_L("+-"), *src)) 69 src++; 70 size = wcsspn(src, _L("0123456789")); 71 src += size; 72 if (*src == _LC('.')) {/* XXX use localeconv */ 73 src++; 74 size = wcsspn(src, _L("0123456789")); 75 src += size; 76 } 77 if (wcschr(_L("Ee"), *src)) { 78 src++; 79 if (wcschr(_L("+-"), *src)) 80 src++; 81 size = wcsspn(src, _L("0123456789")); 82 src += size; 83 } 84 size = src - start; 85 86 /* 87 * convert to a char-string and pass it to strtod. 88 * 89 * since all chars used to represent a double-constant 90 * are in the portable character set, we can assume 91 * that they are 1-byte chars. 92 */ 93 if (size) 94 { 95 mbstate_t st; 96 char *buf; 97 char *end; 98 const wchar_t *s; 99 size_t size_converted; 100 double result; 101 102 buf = malloc(size + 1); 103 if (!buf) { 104 /* error */ 105 errno = ENOMEM; /* XXX */ 106 return 0; 107 } 108 109 s = start; 110 memset(&st, 0, sizeof(st)); 111 size_converted = wcsrtombs(buf, &s, size, &st); 112 if (size != size_converted) { 113 /* XXX should not happen */ 114 free(buf); 115 errno = EILSEQ; 116 return 0; 117 } 118 119 buf[size] = 0; 120 result = strtod(buf, &end); 121 122 free(buf); 123 124 if (endptr) 125 *endptr = __UNCONST( 126 (const wchar_t*)start + (end - buf)); 127 128 return result; 129 } 130 131 if (endptr) 132 *endptr = __UNCONST(start); 133 134 return 0; 135 } 136