/*      $OpenBSD: _wcstod.h,v 1.4 2015/10/01 02:32:07 guenther 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 $
 */

/*
 * function template for wcstof, wcstod and wcstold.
 *
 * parameters:
 *      FUNCNAME : function name
 *      float_type : return type
 *      STRTOD_FUNC : conversion function
 */

float_type
FUNCNAME(const wchar_t *nptr, wchar_t **endptr)
{
        const wchar_t *src;
        size_t size;
        const wchar_t *start;
        const wchar_t *aftersign;

        /*
         * 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++;
        aftersign = src;
        if (wcsncasecmp(src, L"inf", 3) == 0) {
                src += 3;
                if (wcsncasecmp(src, L"inity", 5) == 0)
                        src += 5;
                goto match;
        }
        if (wcsncasecmp(src, L"nan", 3) == 0) {
                src += 3;
                if (*src == L'(') {
                        size = 1;
                        while (src[size] != L'\0' && src[size] != L')')
                                size++;
                        if (src[size] == L')')
                                src += size + 1;
                }
                goto match;
        }
        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;
        }
match:
        size = src - start;

        /*
         * convert to a char-string and pass it to strtod.
         */
        if (src > aftersign) {
                mbstate_t st;
                char *buf;
                char *end;
                const wchar_t *s;
                size_t size_converted;
                float_type result;
                size_t bufsize;

                s = start;
                memset(&st, 0, sizeof(st));
                bufsize = wcsnrtombs(NULL, &s, size, 0, &st);

                buf = malloc(bufsize + 1);
                if (!buf) {
                        errno = ENOMEM; /* XXX */
                        goto fail;
                }

                s = start;
                memset(&st, 0, sizeof(st));
                size_converted = wcsnrtombs(buf, &s, size, bufsize, &st);
                if (size_converted != bufsize) {
                        /* XXX should not happen */
                        free(buf);
                        errno = EILSEQ;
                        goto fail;
                }

                buf[bufsize] = 0;
                result = STRTOD_FUNC(buf, &end);

                if (endptr) {
                        const char *s = buf;
                        memset(&st, 0, sizeof(st));
                        size = mbsnrtowcs(NULL, &s, end - buf, 0, &st);
                        *endptr = (wchar_t*)start + size;
                }

                free(buf);

                return result;
        }

fail:
        if (endptr)
                *endptr = (wchar_t*)nptr;

        return 0;
}
DEF_STRONG(FUNCNAME);