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/* $NetBSD: _wcstod.h,v 1.1 2006/04/15 12:17:23 tnozaki Exp $ */
/*-
* Copyright (c) 2002 Tim J. Robbins
* 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.
*
* Original version ID:
* FreeBSD: /repoman/r/ncvs/src/lib/libc/locale/wcstod.c,v 1.4 2004/04/07 09:47:56 tjr Exp
* NetBSD: wcstod.c,v 1.8 2006/04/13 01:25:13 tnozaki Exp
*/
/*
* function template for wcstof, wcstod, wcstold.
*
* parameters:
* _FUNCNAME : function name
* _RETURN_TYPE : return type
* _STRTOD_FUNC : real conversion function
*/
#ifndef __WCSTOD_H_
#define __WCSTOD_H_
/*
* Convert a string to a double-precision number.
*
* This is the wide-character counterpart of strto{f,d,ld}(). So that
* we do not have to duplicate the code of strto{f,d,ld}() here,
* we convert the supplied wide character string to multibyte and
* call strto{f,d,ld}() on the result.
* This assumes that the multibyte encoding is compatible with ASCII
* for at least the digits, radix character and letters.
*/
_RETURN_TYPE
_FUNCNAME(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr)
{
const wchar_t *src, *start;
_RETURN_TYPE val;
char *buf, *end;
size_t bufsiz, len;
_DIAGASSERT(nptr != NULL);
/* endptr may be null */
src = nptr;
while (iswspace((wint_t)*src) != 0)
++src;
if (*src == L'\0')
goto no_convert;
/*
* Convert the supplied numeric wide char. string to multibyte.
*
* We could attempt to find the end of the numeric portion of the
* wide char. string to avoid converting unneeded characters but
* choose not to bother; optimising the uncommon case where
* the input string contains a lot of text after the number
* duplicates a lot of strto{f,d,ld}()'s functionality and
* slows down the most common cases.
*/
start = src;
len = wcstombs(NULL, src, 0);
if (len == (size_t)-1)
/* errno = EILSEQ */
goto no_convert;
_DIAGASSERT(len > 0);
bufsiz = len;
buf = (void *)malloc(bufsiz + 1);
if (buf == NULL)
/* errno = ENOMEM */
goto no_convert;
len = wcstombs(buf, src, bufsiz + 1);
_DIAGASSERT(len == bufsiz);
_DIAGASSERT(buf[len] == '\0');
/* Let strto{f,d,ld}() do most of the work for us. */
val = _STRTOD_FUNC(buf, &end);
if (buf == end) {
free(buf);
goto no_convert;
}
/*
* We only know where the number ended in the _multibyte_
* representation of the string. If the caller wants to know
* where it ended, count multibyte characters to find the
* corresponding position in the wide char string.
*/
if (endptr != NULL)
/* XXX Assume each wide char is one byte. */
*endptr = __UNCONST(start + (size_t)(end - buf));
free(buf);
return val;
no_convert:
if (endptr != NULL)
*endptr = __UNCONST(nptr);
return 0.0;
}
#endif /*__WCSTOD_H_*/
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