1 bc7cb1a1 2003-11-23 devnull #include <u.h>
  2 bc7cb1a1 2003-11-23 devnull #include <libc.h>
  3 bc7cb1a1 2003-11-23 devnull 
  4 bc7cb1a1 2003-11-23 devnull #define		BUF		65536
  5 bc7cb1a1 2003-11-23 devnull 
  6 bc7cb1a1 2003-11-23 devnull int sflag = 0;
  7 bc7cb1a1 2003-11-23 devnull int lflag = 0;
  8 bc7cb1a1 2003-11-23 devnull int Lflag = 0;
  9 bc7cb1a1 2003-11-23 devnull 
 10 bc7cb1a1 2003-11-23 devnull static void usage(void);
 11 bc7cb1a1 2003-11-23 devnull 
 12 bc7cb1a1 2003-11-23 devnull void
 13 bc7cb1a1 2003-11-23 devnull main(int argc, char *argv[])
 14 bc7cb1a1 2003-11-23 devnull {
 15 bc7cb1a1 2003-11-23 devnull 	int n, i;
 16 bc7cb1a1 2003-11-23 devnull 	uchar *p, *q;
 17 bc7cb1a1 2003-11-23 devnull 	uchar buf1[BUF], buf2[BUF];
 18 bc7cb1a1 2003-11-23 devnull 	int f1, f2;
 19 bc7cb1a1 2003-11-23 devnull 	vlong nc = 1, o, l = 1;
 20 bc7cb1a1 2003-11-23 devnull 	char *name1, *name2;
 21 bc7cb1a1 2003-11-23 devnull 	uchar *b1s, *b1e, *b2s, *b2e;
 22 bc7cb1a1 2003-11-23 devnull 
 23 bc7cb1a1 2003-11-23 devnull 	ARGBEGIN{
 24 bc7cb1a1 2003-11-23 devnull 	case 's':	sflag = 1; break;
 25 bc7cb1a1 2003-11-23 devnull 	case 'l':	lflag = 1; break;
 26 bc7cb1a1 2003-11-23 devnull 	case 'L':	Lflag = 1; break;
 27 bc7cb1a1 2003-11-23 devnull 	default:	usage();
 28 bc7cb1a1 2003-11-23 devnull 	}ARGEND
 29 bc7cb1a1 2003-11-23 devnull 	if(argc < 2)
 30 bc7cb1a1 2003-11-23 devnull 		usage();
 31 bc7cb1a1 2003-11-23 devnull 	if((f1 = open(name1 = *argv++, OREAD)) == -1){
 32 bc7cb1a1 2003-11-23 devnull 		if(!sflag) perror(name1);
 33 bc7cb1a1 2003-11-23 devnull 		exits("open");
 34 bc7cb1a1 2003-11-23 devnull 	}
 35 bc7cb1a1 2003-11-23 devnull 	if((f2 = open(name2 = *argv++, OREAD)) == -1){
 36 bc7cb1a1 2003-11-23 devnull 		if(!sflag) perror(name2);
 37 bc7cb1a1 2003-11-23 devnull 		exits("open");
 38 bc7cb1a1 2003-11-23 devnull 	}
 39 bc7cb1a1 2003-11-23 devnull 	if(*argv){
 40 bc7cb1a1 2003-11-23 devnull 		o = strtoll(*argv++, 0, 0);
 41 bc7cb1a1 2003-11-23 devnull 		if(seek(f1, o, 0) < 0){
 42 bc7cb1a1 2003-11-23 devnull 			if(!sflag) perror("cmp: seek by offset1");
 43 bc7cb1a1 2003-11-23 devnull 			exits("seek 1");
 44 bc7cb1a1 2003-11-23 devnull 		}
 45 bc7cb1a1 2003-11-23 devnull 	}
 46 bc7cb1a1 2003-11-23 devnull 	if(*argv){
 47 bc7cb1a1 2003-11-23 devnull 		o = strtoll(*argv++, 0, 0);
 48 bc7cb1a1 2003-11-23 devnull 		if(seek(f2, o, 0) < 0){
 49 bc7cb1a1 2003-11-23 devnull 			if(!sflag) perror("cmp: seek by offset2");
 50 bc7cb1a1 2003-11-23 devnull 			exits("seek 2");
 51 bc7cb1a1 2003-11-23 devnull 		}
 52 bc7cb1a1 2003-11-23 devnull 	}
 53 bc7cb1a1 2003-11-23 devnull 	if(*argv)
 54 bc7cb1a1 2003-11-23 devnull 		usage();
 55 bc7cb1a1 2003-11-23 devnull 	b1s = b1e = buf1;
 56 bc7cb1a1 2003-11-23 devnull 	b2s = b2e = buf2;
 57 bc7cb1a1 2003-11-23 devnull 	for(;;){
 58 bc7cb1a1 2003-11-23 devnull 		if(b1s >= b1e){
 59 bc7cb1a1 2003-11-23 devnull 			if(b1s >= &buf1[BUF])
 60 bc7cb1a1 2003-11-23 devnull 				b1s = buf1;
 61 bc7cb1a1 2003-11-23 devnull 			n = read(f1, b1s,  &buf1[BUF] - b1s);
 62 bc7cb1a1 2003-11-23 devnull 			b1e = b1s + n;
 63 bc7cb1a1 2003-11-23 devnull 		}
 64 bc7cb1a1 2003-11-23 devnull 		if(b2s >= b2e){
 65 bc7cb1a1 2003-11-23 devnull 			if(b2s >= &buf2[BUF])
 66 bc7cb1a1 2003-11-23 devnull 				b2s = buf2;
 67 bc7cb1a1 2003-11-23 devnull 			n = read(f2, b2s,  &buf2[BUF] - b2s);
 68 bc7cb1a1 2003-11-23 devnull 			b2e = b2s + n;
 69 bc7cb1a1 2003-11-23 devnull 		}
 70 bc7cb1a1 2003-11-23 devnull 		n = b2e - b2s;
 71 bc7cb1a1 2003-11-23 devnull 		if(n > b1e - b1s)
 72 bc7cb1a1 2003-11-23 devnull 			n = b1e - b1s;
 73 bc7cb1a1 2003-11-23 devnull 		if(n <= 0)
 74 bc7cb1a1 2003-11-23 devnull 			break;
 75 bc7cb1a1 2003-11-23 devnull 		if(memcmp((void *)b1s, (void *)b2s, n) != 0){
 76 bc7cb1a1 2003-11-23 devnull 			if(sflag)
 77 bc7cb1a1 2003-11-23 devnull 				exits("differ");
 78 bc7cb1a1 2003-11-23 devnull 			for(p = b1s, q = b2s, i = 0; i < n; p++, q++, i++) {
 79 bc7cb1a1 2003-11-23 devnull 				if(*p == '\n')
 80 bc7cb1a1 2003-11-23 devnull 					l++;
 81 bc7cb1a1 2003-11-23 devnull 				if(*p != *q){
 82 bc7cb1a1 2003-11-23 devnull 					if(!lflag){
 83 bc7cb1a1 2003-11-23 devnull 						print("%s %s differ: char %lld",
 84 bc7cb1a1 2003-11-23 devnull 						    name1, name2, nc+i);
 85 bc7cb1a1 2003-11-23 devnull 						print(Lflag?" line %lld\n":"\n", l);
 86 bc7cb1a1 2003-11-23 devnull 						exits("differ");
 87 bc7cb1a1 2003-11-23 devnull 					}
 88 bc7cb1a1 2003-11-23 devnull 					print("%6lld 0x%.2x 0x%.2x\n", nc+i, *p, *q);
 89 bc7cb1a1 2003-11-23 devnull 				}
 90 bc7cb1a1 2003-11-23 devnull 			}
 91 fa325e9b 2020-01-10 cross 		}
 92 bc7cb1a1 2003-11-23 devnull 		if(Lflag)
 93 bc7cb1a1 2003-11-23 devnull 			for(p = b1s; p < b1e;)
 94 bc7cb1a1 2003-11-23 devnull 				if(*p++ == '\n')
 95 bc7cb1a1 2003-11-23 devnull 					l++;
 96 bc7cb1a1 2003-11-23 devnull 		nc += n;
 97 bc7cb1a1 2003-11-23 devnull 		b1s += n;
 98 bc7cb1a1 2003-11-23 devnull 		b2s += n;
 99 bc7cb1a1 2003-11-23 devnull 	}
100 bc7cb1a1 2003-11-23 devnull 	if(b1e - b1s == b2e - b2s)
101 bc7cb1a1 2003-11-23 devnull 		exits((char *)0);
102 bc7cb1a1 2003-11-23 devnull 	if(!sflag)
103 bc7cb1a1 2003-11-23 devnull 		print("EOF on %s\n", (b1e - b1s > b2e - b2s)? name2 : name1);
104 bc7cb1a1 2003-11-23 devnull 	exits("EOF");
105 bc7cb1a1 2003-11-23 devnull }
106 bc7cb1a1 2003-11-23 devnull 
107 bc7cb1a1 2003-11-23 devnull static void
108 bc7cb1a1 2003-11-23 devnull usage(void)
109 bc7cb1a1 2003-11-23 devnull {
110 a4af25bc 2022-09-06 crossd 	fprint(2, "Usage: cmp [-lsL] file1 file2 [offset1 [offset2] ]\n");
111 bc7cb1a1 2003-11-23 devnull 	exits("usage");
112 bc7cb1a1 2003-11-23 devnull }