case sensitive wildcards match function

wildcards.c

/*
MIT License

Copyright (c) 2010-2017 <http://ez8.co> <orca.zhang@yahoo.com>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

#include <stdio.h>
#include <string.h>
#include <stack>

#define case_sens_eq(x, y, cs) (y == '?' || x == y || (!cs && (unsigned)((x & -33) - 0x41) < 26 && (x ^ y) == 0x20))

bool MatchString(const char* src, const char* matcher, bool case_sens = 1)
{
    std::stack<std::pair<const char*, const char*> > s;
    // scan from start
    while(*src) {
        // match asterisk
        if(*matcher == '*') {
            // skip continuous asterisks
            while(*matcher == '*' && ++matcher);
            // forward to first match char of src
            while(*src && !case_sens_eq(*src, *matcher, case_sens) && ++src);
            // record current position for back-track
            s.push(std::make_pair(src + 1, matcher - 1));
        }
        // eat one character
        else if(case_sens_eq(*src, *matcher, case_sens)) {
            ++src, ++matcher;
        }
        // hit mismatch, then back-track
        else {
            if(s.empty())
                return false;
            src = s.top().first, matcher = s.top().second;
            s.pop();
        }
    }
    // ignore ending asterisks
    while(*matcher == '*' && ++matcher);
    return (!*src && !*matcher);
}

void matcher(const char* src, const char* matcher, bool case_sens = 1)
{
    printf("[%s] src: %s matcher: %s\n", MatchString(src, matcher, case_sens) ? "true" : "false", src, matcher);
}

int main()
{
    matcher("aa", "a*a");
    matcher("abcda", "ccc");
    matcher("abcda", "a*a");
    matcher("dabcsjabcd", "*abc****a?cd**");
    matcher("abcaxcd", "*abc*a?cd**");
    matcher("dabssjaxcdal", "*abc***a?cd*");
    matcher("dabssabcjaxceaxcd9", "*abc*a?cd*");
    matcher("A-2-101~122 -7.7_t3.txt", "*.txt");
    matcher("ABBCBCCC.TXT", "A*BC??.txt", 0);
    matcher("AA", "a*a", 0);
    matcher("Aaaa", "a*a", 0);
    matcher("ABA", "a?a", 0);
    matcher("ABAd", "a?a", 0);
    matcher("xcd", "*?CD*", 0);

    /*
    [true] src: aa matcher: a*a
    [false] src: abcda matcher: ccc
    [true] src: abcda matcher: a*a
    [true] src: kjsajkabxasdabcsjabcd matcher: *abc****a?cd**
    [true] src: abcaxcd matcher: *abc*a?cd**
    [false] src: kjsajkabxasdabssjaxcdal matcher: *abc***a?cd*
    [true] src: kjsajkabxasdabssabcjaxceaxcd9 matcher: *abc*a?cd*
    [true] src: A-2-101~122 -7.7_t3.txt matcher: *.txt
    [true] src: ABBCBCCC.TXT matcher: A*BC??.txt
    [true] src: AA matcher: a*a
    [true] src: Aaaa matcher: a*a
    [true] src: ABA matcher: a?a
    [false] src: ABAd matcher: a?a
    [true] src: xcd matcher: *?CD*
    */
    return 0;
}