/*
 * Copyright (C) 2011 Mathieu Turcotte (mathieuturcotte.ca)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/.
 */

#include <string.h>

#include "spec.h"

int _match_spec(const char* spec, const char* text) {

    /*
     * If the whole specification string was consumed and
     * the input text is also exhausted: it's a match.
     */
    if (spec[0] == '\0' && text[0] == '\0')
        return 1;

    /* A star matches 0 or more characters. */
    if (spec[0] == '*') {
        /*
         * Skip the star and try to find a match after it
         * by successively incrementing the text pointer.
         */
        do {
            if (_match_spec(spec + 1, text))
                return 1;
        } while (*text++ != '\0');
    }

    /*
     * An interrogation mark matches any character. Other
     * characters match themself. Also, if the input text
     * is exhausted but the specification isn't, there is
     * no match.
     */
    if (text[0] != '\0' && (spec[0] == '?' || spec[0] == text[0]))
        return _match_spec(spec + 1, text + 1);

    return 0;
}

int match_spec(const char* spec, const char* text) {

    /* On Windows, *.* matches everything. */
    if (strcmp(spec, "*.*") == 0)
        return 1;

    return _match_spec(spec, text);
}