cmp.c revision dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0
1dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <stdio.h> 2dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <stdlib.h> 3dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <string.h> 4dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <stdint.h> 5dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <fcntl.h> 6dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <sys/ioctl.h> 7dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <errno.h> 8dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 9dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectint cmp_main(int argc, char *argv[]) 10dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 11dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int c; 12dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int fd1, fd2; 13dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project char buf1[4096], buf2[4096]; 14dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int res, res1, res2; 15dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int rv = 0; 16dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int i; 17dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int filepos = 0; 18dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 19dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int show_byte = 0; 20dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int show_all = 0; 21dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int limit = 0; 22dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 23dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project do { 24dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project c = getopt(argc, argv, "bln:"); 25dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (c == EOF) 26dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project break; 27dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project switch (c) { 28dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project case 'b': 29dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project show_byte = 1; 30dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project break; 31dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project case 'l': 32dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project show_all = 1; 33dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project break; 34dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project case 'n': 35dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project limit = atoi(optarg); 36dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project break; 37dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project case '?': 38dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project fprintf(stderr, "%s: invalid option -%c\n", 39dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project argv[0], optopt); 40dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project exit(1); 41dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 42dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } while (1); 43dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 44dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (optind + 2 != argc) { 45dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project fprintf(stderr, "Usage: %s [-b] [-l] [-n count] file1 file2\n", argv[0]); 46dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project exit(1); 47dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 48dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 49dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project fd1 = open(argv[optind], O_RDONLY); 50dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(fd1 < 0) { 51dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project fprintf(stderr, "could not open %s, %s\n", argv[optind], strerror(errno)); 52dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return 1; 53dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 54dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 55dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project fd2 = open(argv[optind+1], O_RDONLY); 56dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(fd2 < 0) { 57dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project fprintf(stderr, "could not open %s, %s\n", argv[optind+1], strerror(errno)); 58dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return 1; 59dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 60dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 61dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project while(1) { 62dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project res1 = read(fd1, &buf1, sizeof(buf1)); 63dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project res2 = read(fd2, &buf2, sizeof(buf2)); 64dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project res = res1 < res2 ? res1 : res2; 65dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(res1 == 0 && res2 == 0) { 66dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return rv; 67dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 68dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project for(i = 0; i < res; i++) { 69dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(buf1[i] != buf2[i]) { 70dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project printf("%s %s differ byte %d", argv[optind], argv[optind+1], filepos + i); 71dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(show_byte) 72dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project printf(" 0x%02x 0x%02x", buf1[i], buf2[i]); 73dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project printf("\n"); 74dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(!show_all) 75dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return 1; 76dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project rv = 1; 77dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 78dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(limit) { 79dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project limit--; 80dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(limit == 0) 81dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return rv; 82dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 83dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 84dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if(res1 != res2 || res < 0) { 85dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project printf("%s on %s\n", res < 0 ? "Read error" : "EOF", res1 < res2 ? argv[optind] : argv[optind+1]); 86dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return 1; 87dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 88dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project filepos += res; 89dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 90dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 91