| rsc | bc7cb1a | 2003-11-23 18:04:47 +0000 | [diff] [blame] | 1 | #include <u.h> |
| 2 | #include <libc.h> |
| 3 | |
| 4 | #define BUF 65536 |
| 5 | |
| 6 | int sflag = 0; |
| 7 | int lflag = 0; |
| 8 | int Lflag = 0; |
| 9 | |
| 10 | static void usage(void); |
| 11 | |
| 12 | void |
| 13 | main(int argc, char *argv[]) |
| 14 | { |
| 15 | int n, i; |
| 16 | uchar *p, *q; |
| 17 | uchar buf1[BUF], buf2[BUF]; |
| 18 | int f1, f2; |
| 19 | vlong nc = 1, o, l = 1; |
| 20 | char *name1, *name2; |
| 21 | uchar *b1s, *b1e, *b2s, *b2e; |
| 22 | |
| 23 | ARGBEGIN{ |
| 24 | case 's': sflag = 1; break; |
| 25 | case 'l': lflag = 1; break; |
| 26 | case 'L': Lflag = 1; break; |
| 27 | default: usage(); |
| 28 | }ARGEND |
| 29 | if(argc < 2) |
| 30 | usage(); |
| 31 | if((f1 = open(name1 = *argv++, OREAD)) == -1){ |
| 32 | if(!sflag) perror(name1); |
| 33 | exits("open"); |
| 34 | } |
| 35 | if((f2 = open(name2 = *argv++, OREAD)) == -1){ |
| 36 | if(!sflag) perror(name2); |
| 37 | exits("open"); |
| 38 | } |
| 39 | if(*argv){ |
| 40 | o = strtoll(*argv++, 0, 0); |
| 41 | if(seek(f1, o, 0) < 0){ |
| 42 | if(!sflag) perror("cmp: seek by offset1"); |
| 43 | exits("seek 1"); |
| 44 | } |
| 45 | } |
| 46 | if(*argv){ |
| 47 | o = strtoll(*argv++, 0, 0); |
| 48 | if(seek(f2, o, 0) < 0){ |
| 49 | if(!sflag) perror("cmp: seek by offset2"); |
| 50 | exits("seek 2"); |
| 51 | } |
| 52 | } |
| 53 | if(*argv) |
| 54 | usage(); |
| 55 | b1s = b1e = buf1; |
| 56 | b2s = b2e = buf2; |
| 57 | for(;;){ |
| 58 | if(b1s >= b1e){ |
| 59 | if(b1s >= &buf1[BUF]) |
| 60 | b1s = buf1; |
| 61 | n = read(f1, b1s, &buf1[BUF] - b1s); |
| 62 | b1e = b1s + n; |
| 63 | } |
| 64 | if(b2s >= b2e){ |
| 65 | if(b2s >= &buf2[BUF]) |
| 66 | b2s = buf2; |
| 67 | n = read(f2, b2s, &buf2[BUF] - b2s); |
| 68 | b2e = b2s + n; |
| 69 | } |
| 70 | n = b2e - b2s; |
| 71 | if(n > b1e - b1s) |
| 72 | n = b1e - b1s; |
| 73 | if(n <= 0) |
| 74 | break; |
| 75 | if(memcmp((void *)b1s, (void *)b2s, n) != 0){ |
| 76 | if(sflag) |
| 77 | exits("differ"); |
| 78 | for(p = b1s, q = b2s, i = 0; i < n; p++, q++, i++) { |
| 79 | if(*p == '\n') |
| 80 | l++; |
| 81 | if(*p != *q){ |
| 82 | if(!lflag){ |
| 83 | print("%s %s differ: char %lld", |
| 84 | name1, name2, nc+i); |
| 85 | print(Lflag?" line %lld\n":"\n", l); |
| 86 | exits("differ"); |
| 87 | } |
| 88 | print("%6lld 0x%.2x 0x%.2x\n", nc+i, *p, *q); |
| 89 | } |
| 90 | } |
| 91 | } |
| 92 | if(Lflag) |
| 93 | for(p = b1s; p < b1e;) |
| 94 | if(*p++ == '\n') |
| 95 | l++; |
| 96 | nc += n; |
| 97 | b1s += n; |
| 98 | b2s += n; |
| 99 | } |
| 100 | if(b1e - b1s == b2e - b2s) |
| 101 | exits((char *)0); |
| 102 | if(!sflag) |
| 103 | print("EOF on %s\n", (b1e - b1s > b2e - b2s)? name2 : name1); |
| 104 | exits("EOF"); |
| 105 | } |
| 106 | |
| 107 | static void |
| 108 | usage(void) |
| 109 | { |
| 110 | print("Usage: cmp [-lsL] file1 file2 [offset1 [offset2] ]\n"); |
| 111 | exits("usage"); |
| 112 | } |
