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wcstod.c revision 1.4 
      1 /* $NetBSD: wcstod.c,v 1.4 2001/10/28 12:08:43 yamt 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 #include <assert.h>
     33 #include <errno.h>
     34 #include <stdlib.h>
     35 #include <string.h>
     36 #include <wchar.h>
     37 #include <wctype.h>
     38 
     39 #define _L(x) __CONCAT(L,x)
     40 #define _LC(x) __CONCAT(L,x)
     41 
     42 double
     43 wcstod(const wchar_t *nptr, wchar_t **endptr)
     44 {
     45 	const wchar_t *src;
     46 	size_t size;
     47 	const wchar_t *start;
     48 
     49 	_DIAGASSERT(nptr);
     50 
     51 	/*
     52 	 * we do only check length of string
     53 	 * and give it over strtod.
     54 	 */
     55 	src = nptr;
     56 
     57 	/* skip space first */
     58 	while (iswspace(*src)) {
     59 		src++;
     60 	}
     61 
     62 	/* get length of string */
     63 	start = src;
     64 	if (wcschr(_L("+-"), *src))
     65 		src++;
     66 	size = wcsspn(src, _L("0123456789"));
     67 	src += size;
     68 	if (*src == _LC('.')) {/* XXX use localeconv */
     69 		src++;
     70 		size = wcsspn(src, _L("0123456789"));
     71 		src += size;
     72 	}
     73 	if (wcschr(_L("Ee"), *src)) {
     74 		src++;
     75 		if (wcschr(_L("+-"), *src))
     76 			src++;
     77 		size = wcsspn(src, _L("0123456789"));
     78 		src += size;
     79 	}
     80 	size = src - start;
     81 
     82 	/*
     83 	 * convert to a char-string and pass it to strtod.
     84 	 *
     85 	 * since all chars used to represent a double-constant
     86 	 * are in the portable character set, we can assume
     87 	 * that they are 1-byte chars.
     88 	 */
     89 	if (size)
     90 	{
     91 		mbstate_t st;
     92 		char *buf;
     93 		char *end;
     94 		const wchar_t *s;
     95 		size_t size_converted;
     96 		double result;
     97 
     98 		buf = malloc(size + 1);
     99 		if (!buf) {
    100 			/* error */
    101 			errno = ENOMEM; /* XXX */
    102 			return 0;
    103 		}
    104 
    105 		s = start;
    106 		memset(&st, 0, sizeof(st));
    107 		size_converted = wcsrtombs(buf, &s, size, &st);
    108 		if (size != size_converted) {
    109 			/* XXX should not happen */
    110 			free(buf);
    111 			errno = EILSEQ;
    112 			return 0;
    113 		}
    114 
    115 		buf[size] = 0;
    116 		result = strtod(buf, &end);
    117 
    118 		free(buf);
    119 
    120 		if (endptr)
    121 			/* LINTED bad interface */
    122 			*endptr = (wchar_t*)start + (end - buf);
    123 
    124 		return result;
    125 	}
    126 
    127 	if (endptr)
    128 		/* LINTED bad interface */
    129 		*endptr = (wchar_t*)start;
    130 
    131 	return 0;
    132 }
    133