Coding Problems, Solutions and more: /cps/

I was working lately with roman numbers converter, but I can't make run my code properly.
What could be the problem?

#include <stdio.h>

#define ROMAN_PLACE(x) r_output[ro_counter++]=roman_numbers[x]

int main(int argc, char *argv[]) {
    char roman_numbers[7] = {'I', 'V', 'X', 'L', 'C', 'D', 'M'};
    char r_output[15];
    unsigned char places = 0, i = 0, j = 0, ro_counter = 0;
    
    if (argc == 1) goto exit;
    while(argv[1][places++]);
    if (places < 2 || places > 5) goto exit;
    places--;
    
    if (places == 4)
    if (4 < (argv[1][0] - 32) && 0 > (argv[1][0] - 32))
        for (ro_counter = i = argv[1][0] - 32; i > 0;)
        r_output[--i] = roman_numbers[6];

    for (i = !!ro_counter; i < places; i++) {
    switch (argv[1][i]) {
    case '9':
        ROMAN_PLACE((places-i-1)*2);
        ROMAN_PLACE((places-i)*2);
        break;
    case '8': case '7': case '6': case '5':
        ROMAN_PLACE((places-i-1)*2+1);
        for(j = argv[0][i] - 5; j > '0'; j--)
        ROMAN_PLACE((places-i-1)*2);
        break;
    case '4':
        ROMAN_PLACE((places-i-1)*2);
        ROMAN_PLACE((places-i-1)*2+1);
        break;
    case '3': case '2': case '1': {
        for(j = argv[0][i]; j > '0'; j--)
        ROMAN_PLACE((places-i-1)*2);
        break;
        }
    case '0':
        break;
    }
    }

    printf(r_output);
    printf("\n");

exit:
    return 0;
}

We wont solve your homework and stop self bumping

>>58638796
It's not a homework.
If it were a homework, it would be written on some other language with adequate algorithm.