Convert file from mac(\r)/unix(\n)/dos(\r\n) formats to the unix format

tounix.c

/* Author: m039 <flam44 (at) gmail (dot) com> */

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

static FILE *src;
static FILE *dst;

int main(int argc, char **argv) {
        int c;

        if (argc < 3) {
                fprintf(stderr, "Usage: ./tounix <from> <to>\n");
                return -1;
        }

        src = fopen(argv[1], "r");
        if (src == NULL) {
                perror(argv[1]);
                return -1;
        }

        dst = fopen(argv[2], "w");
        if (dst == NULL) {
                perror(argv[2]);
                return -1;
        }

        while ((c = fgetc(src)) != EOF) {
		do {
			if (c == '\r') {
				fputc('\n', dst);
				
				c = fgetc(src);

				if (c == EOF) {
					goto out;
				}

				if ((c != '\n') && (c != '\r')) {
					fputc(c, dst);
				}
			} else {
				fputc(c, dst);
			}
		} while (c == '\r');
        }

out:

        fclose(dst);
        fclose(src);

        return 0;
}