Merge "Lose cmp to toybox."

    grep \

OUR_TOOLS := \

    cmp \

    df \

    getevent \

    getprop \

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <stdint.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/ioctl.h>

#include <errno.h>

int cmp_main(int argc, char *argv[])

{

    int c;

    int fd1, fd2;

	char buf1[4096], buf2[4096];

    int res, res1, res2;

	int rv = 0;

	int i;

	int filepos = 0;

	int show_byte = 0;

	int show_all = 0;

	int limit = 0;

    do {

        c = getopt(argc, argv, "bln:");

        if (c == EOF)

            break;

        switch (c) {

        case 'b':

            show_byte = 1;

            break;

        case 'l':

            show_all = 1;

            break;

        case 'n':

            limit = atoi(optarg);

            break;

        case '?':

            fprintf(stderr, "%s: invalid option -%c\n",

                argv[0], optopt);

            exit(1);

        }

    } while (1);

    if (optind + 2 != argc) {

        fprintf(stderr, "Usage: %s [-b] [-l] [-n count] file1 file2\n", argv[0]);

        exit(1);

    }

    fd1 = open(argv[optind], O_RDONLY);

    if(fd1 < 0) {

        fprintf(stderr, "could not open %s, %s\n", argv[optind], strerror(errno));

        return 1;

    }

    fd2 = open(argv[optind+1], O_RDONLY);

    if(fd2 < 0) {

        fprintf(stderr, "could not open %s, %s\n", argv[optind+1], strerror(errno));

        return 1;

    }

    while(1) {

        res1 = read(fd1, &buf1, sizeof(buf1));

        res2 = read(fd2, &buf2, sizeof(buf2));

		res = res1 < res2 ? res1 : res2;

		if(res1 == 0 && res2 == 0) {

			return rv;

		}

		for(i = 0; i < res; i++) {

			if(buf1[i] != buf2[i]) {

				printf("%s %s differ byte %d", argv[optind], argv[optind+1], filepos + i);

				if(show_byte)

					printf(" 0x%02x 0x%02x", buf1[i], buf2[i]);

				printf("\n");

				if(!show_all)

					return 1;

				rv = 1;

			}

			if(limit) {

				limit--;

				if(limit == 0)

					return rv;

			}

		}

		if(res1 != res2 || res < 0) {

			printf("%s on %s\n", res < 0 ? "Read error" : "EOF", res1 < res2 ? argv[optind] : argv[optind+1]);

			return 1;

		}

		filepos += res;

    }

}