Prints the key signature from the corresponding SMF meta-event values

keysig.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

int main(int argc, char* argv[])
{
    if (argc == 3) {
        int sf = atoi(argv[1]);
        int mi = atoi(argv[2]);
        if (abs(sf) < 8 && mi < 2) {
            char* maj[] = {"C flat", "G flat", "D flat", "A flat", "E flat", "B flat",
                "F", "C", "G", "D", "A", "E", "B", "F sharp", "C sharp"};
            char* min[] = {"A flat", "E flat", "B flat",
                "F", "C", "G", "D", "A", "E", "B", "F sharp", "C sharp", "G sharp", "D sharp", "A sharp"};
            printf ("sf=%d, m=%d => %s %s\n", sf, mi, mi == 0 ? maj[sf + 7] : min[sf + 7], mi == 0 ? "major" : "minor" );
        }
    }
    return 0;
}