wlite_wcsspn.c

/*
 * wlite: A 16-bit Unicode based tiny <wchar.h> library with CJK features
 * Copyright (C) 2022 Eido INOUE
 * 
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any
 * later version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Lesser Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
*/

#include "wlite_config.h"   // wchar_t, NULL, size_t

#include "wlite_wchar.h"    // prototypes
#include "wlite_wctype.h"
#include "wlite_stdlib.h"

size_t
wlite_wcsspn(const wchar_t *s1, const wchar_t *s2) {
    const wchar_t *sc1, *sc2;

    for (sc1 = s1; *sc1 != L'\0'; ++sc1) {
        for (sc2 = s2;; ++sc2) {
            if (*sc2 == L'\0') return (size_t) (sc1 - s1);
            else if (*sc1 == *sc2) break;
        }
    }
    return (size_t) (sc1 - s1);
}