/* $NetBSD: _wcstod.h,v 1.4 2013/05/17 12:55:57 joerg 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
 * aINre 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_

#include <locale.h>
#include "setlocale_local.h"
#define INT_NAME_(pre, middle, post) pre ## middle ## post
#define INT_NAME(pre, middle, post) INT_NAME_(pre, middle, post)

/*
 * 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.
 */
static _RETURN_TYPE
INT_NAME(_int_, _FUNCNAME, _l)(const wchar_t * __restrict nptr,
                           wchar_t ** __restrict endptr, locale_t loc)
{
        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_l((wint_t)*src, loc) != 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_l(NULL, src, 0, loc);
        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_l(buf, src, bufsiz + 1, loc);

        _DIAGASSERT(len == bufsiz);
        _DIAGASSERT(buf[len] == '\0');

        /* Let strto{f,d,ld}() do most of the work for us. */
        val = _STRTOD_FUNC(buf, &end, loc);
        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;
}

_RETURN_TYPE
INT_NAME(, _FUNCNAME, )(const wchar_t * __restrict nptr,
    wchar_t ** __restrict endptr)
{
        return INT_NAME(_int_, _FUNCNAME, _l)(nptr, endptr, _current_locale());
}

_RETURN_TYPE
INT_NAME(, _FUNCNAME, _l)(const wchar_t * __restrict nptr,
    wchar_t ** __restrict endptr, locale_t loc)
{
        return INT_NAME(_int_, _FUNCNAME, _l)(nptr, endptr, loc);
}
#endif /*__WCSTOD_H_*/