1 /* $NetBSD: _wcstod.h,v 1.2 2010/12/16 17:42:27 wiz Exp $ */ 2 3 /*- 4 * Copyright (c) 2002 Tim J. Robbins 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 * Original version ID: 29 * FreeBSD: /repoman/r/ncvs/src/lib/libc/locale/wcstod.c,v 1.4 2004/04/07 09:47:56 tjr Exp 30 * NetBSD: wcstod.c,v 1.8 2006/04/13 01:25:13 tnozaki Exp 31 */ 32 33 /* 34 * function template for wcstof, wcstod, wcstold. 35 * 36 * parameters: 37 * _FUNCNAME : function name 38 * _RETURN_TYPE : return type 39 * _STRTOD_FUNC : real conversion function 40 */ 41 #ifndef __WCSTOD_H_ 42 #define __WCSTOD_H_ 43 44 /* 45 * Convert a string to a double-precision number. 46 * 47 * This is the wide-character counterpart of strto{f,d,ld}(). So that 48 * we do not have to duplicate the code of strto{f,d,ld}() here, 49 * we convert the supplied wide-character string to multibyte and 50 * call strto{f,d,ld}() on the result. 51 * This assumes that the multibyte encoding is compatible with ASCII 52 * for at least the digits, radix character and letters. 53 */ 54 _RETURN_TYPE 55 _FUNCNAME(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr) 56 { 57 const wchar_t *src, *start; 58 _RETURN_TYPE val; 59 char *buf, *end; 60 size_t bufsiz, len; 61 62 _DIAGASSERT(nptr != NULL); 63 /* endptr may be null */ 64 65 src = nptr; 66 while (iswspace((wint_t)*src) != 0) 67 ++src; 68 if (*src == L'\0') 69 goto no_convert; 70 71 /* 72 * Convert the supplied numeric wide-char. string to multibyte. 73 * 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 strto{f,d,ld}()'s functionality and 79 * slows down the most common cases. 80 */ 81 start = src; 82 len = wcstombs(NULL, src, 0); 83 if (len == (size_t)-1) 84 /* errno = EILSEQ */ 85 goto no_convert; 86 87 _DIAGASSERT(len > 0); 88 89 bufsiz = len; 90 buf = (void *)malloc(bufsiz + 1); 91 if (buf == NULL) 92 /* errno = ENOMEM */ 93 goto no_convert; 94 95 len = wcstombs(buf, src, bufsiz + 1); 96 97 _DIAGASSERT(len == bufsiz); 98 _DIAGASSERT(buf[len] == '\0'); 99 100 /* Let strto{f,d,ld}() do most of the work for us. */ 101 val = _STRTOD_FUNC(buf, &end); 102 if (buf == end) { 103 free(buf); 104 goto no_convert; 105 } 106 107 /* 108 * We only know where the number ended in the _multibyte_ 109 * representation of the string. If the caller wants to know 110 * where it ended, count multibyte characters to find the 111 * corresponding position in the wide-char string. 112 */ 113 if (endptr != NULL) 114 /* XXX Assume each wide char is one byte. */ 115 *endptr = __UNCONST(start + (size_t)(end - buf)); 116 117 free(buf); 118 119 return val; 120 121 no_convert: 122 if (endptr != NULL) 123 *endptr = __UNCONST(nptr); 124 return 0; 125 } 126 #endif /*__WCSTOD_H_*/ 127