#include <stdio.h>

int main (int argc, char * argv []) {
    if (argc != 3) {
	printf("usage: %s <source> <destination>\n", argv[0]);
	return 1;
    }
    FILE * src = fopen(argv[1], "r");
    if (src == 0)  {
	printf("could not open source file %s\n", argv[1]);
	return 1;
    }

    FILE * dst = fopen(argv[2], "w");
    if (dst == 0)  {
	printf("could not open destination file %s\n", argv[2]);
	fclose(src);
	return 1;
    }
    int c;
    while ((c = fgetc(src)) != EOF) {
	if (fputc(c, dst) == EOF) {
	    printf("could not write onto destination file %s\n", argv[2]);
	    fclose(src);
	    fclose(dst);
	    return 1;
	}
    }
    fclose(src);
    fclose(dst);
}