133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
/* $NetBSD: wcstod.c,v 1.4 2001/10/28 12:08:43 yamt Exp $ */
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/*-
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* Copyright (c)1999, 2000, 2001 Citrus Project,
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstod.c,v 1.2 2001/09/27 16:23:57 yamt Exp $
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*/
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#include <sys/cdefs.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wchar.h>
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#include <wctype.h>
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#define _L(x) __CONCAT(L,x)
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#define _LC(x) __CONCAT(L,x)
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double
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wcstod(const wchar_t *nptr, wchar_t **endptr)
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{
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const wchar_t *src;
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size_t size;
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const wchar_t *start;
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_DIAGASSERT(nptr);
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/*
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* we do only check length of string
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* and give it over strtod.
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*/
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src = nptr;
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/* skip space first */
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while (iswspace(*src)) {
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src++;
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}
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/* get length of string */
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start = src;
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if (wcschr(_L("+-"), *src))
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src++;
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size = wcsspn(src, _L("0123456789"));
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src += size;
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if (*src == _LC('.')) {/* XXX use localeconv */
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src++;
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size = wcsspn(src, _L("0123456789"));
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src += size;
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}
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if (wcschr(_L("Ee"), *src)) {
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src++;
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if (wcschr(_L("+-"), *src))
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src++;
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size = wcsspn(src, _L("0123456789"));
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src += size;
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}
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size = src - start;
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/*
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* convert to a char-string and pass it to strtod.
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*
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* since all chars used to represent a double-constant
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* are in the portable character set, we can assume
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* that they are 1-byte chars.
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*/
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if (size)
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{
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mbstate_t st;
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char *buf;
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char *end;
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const wchar_t *s;
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size_t size_converted;
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double result;
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buf = malloc(size + 1);
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if (!buf) {
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/* error */
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errno = ENOMEM; /* XXX */
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return 0;
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}
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s = start;
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memset(&st, 0, sizeof(st));
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size_converted = wcsrtombs(buf, &s, size, &st);
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if (size != size_converted) {
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/* XXX should not happen */
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free(buf);
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errno = EILSEQ;
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return 0;
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}
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buf[size] = 0;
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result = strtod(buf, &end);
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free(buf);
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if (endptr)
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/* LINTED bad interface */
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*endptr = (wchar_t*)start + (end - buf);
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return result;
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}
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if (endptr)
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/* LINTED bad interface */
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*endptr = (wchar_t*)start;
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return 0;
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}
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