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/* $OpenBSD: wcstod.c,v 1.2 2008/10/05 19:52:34 kettenis Exp $ */
/* $NetBSD: wcstod.c,v 1.4 2001/10/28 12:08:43 yamt Exp $ */
/*-
* Copyright (c)1999, 2000, 2001 Citrus Project,
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstod.c,v 1.2 2001/09/27 16:23:57 yamt Exp $
*/
#include <sys/cdefs.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <wctype.h>
double
wcstod(const wchar_t *nptr, wchar_t **endptr)
{
const wchar_t *src;
size_t size;
const wchar_t *start;
/*
* check length of string and call strtod
*/
src = nptr;
/* skip space first */
while (iswspace(*src)) {
src++;
}
/* get length of string */
start = src;
if (*src && wcschr(L"+-", *src))
src++;
size = wcsspn(src, L"0123456789");
src += size;
if (*src == L'.') {/* XXX use localeconv */
src++;
size = wcsspn(src, L"0123456789");
src += size;
}
if (*src && wcschr(L"Ee", *src)) {
src++;
if (*src && wcschr(L"+-", *src))
src++;
size = wcsspn(src, L"0123456789");
src += size;
}
size = src - start;
/*
* convert to a char-string and pass it to strtod.
*
* since all mb chars used to represent a double-constant
* are in the portable character set, we can assume
* that they are 1-byte chars.
*/
if (size)
{
mbstate_t st;
char *buf;
char *end;
const wchar_t *s;
size_t size_converted;
double result;
buf = malloc(size + 1);
if (!buf) {
/* error */
errno = ENOMEM; /* XXX */
return 0;
}
s = start;
memset(&st, 0, sizeof(st));
size_converted = wcsrtombs(buf, &s, size, &st);
if (size != size_converted) {
/* XXX should not happen */
free(buf);
errno = EILSEQ;
return 0;
}
buf[size] = 0;
result = strtod(buf, &end);
free(buf);
if (endptr)
/* LINTED bad interface */
*endptr = (wchar_t*)start + (end - buf);
return result;
}
if (endptr)
/* LINTED bad interface */
*endptr = (wchar_t*)start;
return 0;
}
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