cmp.c (1419B)
1 /* See LICENSE file for copyright and license details. */ 2 #include <stdio.h> 3 #include <stdlib.h> 4 #include <string.h> 5 6 #include "util.h" 7 8 static void 9 usage(void) 10 { 11 enprintf(2, "usage: %s [-l | -s] file1 file2\n", argv0); 12 } 13 14 int 15 main(int argc, char *argv[]) 16 { 17 FILE *fp[2]; 18 size_t line = 1, n; 19 int ret = 0, lflag = 0, sflag = 0, same = 1, b[2]; 20 21 ARGBEGIN { 22 case 'l': 23 lflag = 1; 24 break; 25 case 's': 26 sflag = 1; 27 break; 28 default: 29 usage(); 30 } ARGEND 31 32 if (argc != 2 || (lflag && sflag)) 33 usage(); 34 35 for (n = 0; n < 2; n++) { 36 if (!strcmp(argv[n], "-")) { 37 argv[n] = "<stdin>"; 38 fp[n] = stdin; 39 } else { 40 if (!(fp[n] = fopen(argv[n], "r"))) { 41 if (!sflag) 42 weprintf("fopen %s:", argv[n]); 43 return 2; 44 } 45 } 46 } 47 48 for (n = 1; ; n++) { 49 b[0] = getc(fp[0]); 50 b[1] = getc(fp[1]); 51 52 if (b[0] == b[1]) { 53 if (b[0] == EOF) 54 break; 55 else if (b[0] == '\n') 56 line++; 57 continue; 58 } else if (b[0] == EOF || b[1] == EOF) { 59 if (!sflag) 60 weprintf("EOF on %s\n", argv[(b[0] != EOF)]); 61 same = 0; 62 break; 63 } else if (!lflag) { 64 if (!sflag) 65 printf("%s %s differ: byte %zu, line %zu\n", 66 argv[0], argv[1], n, line); 67 same = 0; 68 break; 69 } else { 70 printf("%zu %o %o\n", n, b[0], b[1]); 71 same = 0; 72 } 73 } 74 75 if (!ret) 76 ret = !same; 77 if (fshut(fp[0], argv[0]) | (fp[0] != fp[1] && fshut(fp[1], argv[1])) | 78 fshut(stdout, "<stdout>")) 79 ret = 2; 80 81 return ret; 82 }