/* cmp.c - 19 Apr 88  A.J.Travis */

/*
 * Simple file comparison
 */

#include <stdio.h>

char buf1[BUFSIZ];
char buf2[BUFSIZ];
char *bp1, *bp2;
int c1, c2;
int fd1, fd2;
int n1, n2;
int n;

int main(argc, argv)
int argc;
char *argv[];
{
	if (argc != 3) {
		fprintf(stderr, "usage: cmp file1 file2\n");
		exit(-1);
	}
	if ((fd1 = open(argv[1], 0)) == -1) {
		fprintf(stderr, "cmp: can't open %s\n", argv[1]);
		exit(-1);
	}
	if ((fd2 = open(argv[2], 0)) == -1) {
		fprintf(stderr, "cmp: can't open %s\n", argv[2]);
		close(fd1);
		exit(-1);
	}
	n = 0;
	do {
		n1 = read(fd1, buf1, BUFSIZ);
		n2 = read(fd2, buf2, BUFSIZ);
		bp1 = buf1;
		bp2 = buf2;
		while ((bp1 < buf1 + n1) & (bp2 < buf2 + n2)) {
			if ((c1 = *bp1++ & 0xFF) != (c2 = *bp2++ & 0xFF))
				printf("%4X: %02X %02X\n", n, c1, c2);
			n++;
		}
		if (n1 < n2)
			printf("cmp: end of file on %s\n", argv[1]);
		if (n1 > n2)
			printf("cmp: end of file on %s\n", argv[2]);
	}
	while (n1 > 0 & n1 == n2);
	close(fd1);
	close(fd2);
	exit(0);
}