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#include <u.h>
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#include <libc.h>
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#include <ctype.h>
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#define		BUF		65536
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int sflag = 0;
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int lflag = 0;
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int Lflag = 0;
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static void usage(void);
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char **
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seekoff(int fd, char *name, char **argv)
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{
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	vlong o;
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	if(*argv){
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		if (!isascii(**argv) || !isdigit(**argv))
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			usage();
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		o = strtoll(*argv++, 0, 0);
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		if(seek(fd, o, 0) < 0){
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			if(!sflag) fprint(2, "cmp: %s: seek by %lld: %r\n",
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				name, o);
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			exits("seek");
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		}
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	}
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	return argv;
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}
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void
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main(int argc, char *argv[])
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{
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	int n, i;
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	uchar *p, *q;
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	uchar buf1[BUF], buf2[BUF];
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	int f1, f2;
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	vlong nc = 1, l = 1;
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	char *name1, *name2;
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	uchar *b1s, *b1e, *b2s, *b2e;
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	ARGBEGIN{
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	case 's':	sflag = 1; break;
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	case 'l':	lflag = 1; break;
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	case 'L':	Lflag = 1; break;
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	default:	usage();
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	}ARGEND
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	if(argc < 2 || argc > 4)
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		usage();
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	if((f1 = open(name1 = *argv++, OREAD)) == -1){
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		if(!sflag) perror(name1);
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		exits("open");
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	}
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	if((f2 = open(name2 = *argv++, OREAD)) == -1){
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		if(!sflag) perror(name2);
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		exits("open");
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	}
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	argv = seekoff(f1, name1, argv);
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	argv = seekoff(f2, name2, argv);
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	if(*argv)
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		usage();
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	b1s = b1e = buf1;
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	b2s = b2e = buf2;
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	for(;;){
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		if(b1s >= b1e){
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			if(b1s >= &buf1[BUF])
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				b1s = buf1;
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			n = read(f1, b1s,  &buf1[BUF] - b1s);
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			b1e = b1s + n;
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		}
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		if(b2s >= b2e){
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			if(b2s >= &buf2[BUF])
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				b2s = buf2;
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			n = read(f2, b2s,  &buf2[BUF] - b2s);
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			b2e = b2s + n;
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		}
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		n = b2e - b2s;
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		if(n > b1e - b1s)
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			n = b1e - b1s;
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		if(n <= 0)
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			break;
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		if(memcmp((void *)b1s, (void *)b2s, n) != 0){
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			if(sflag)
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				exits("differ");
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			for(p = b1s, q = b2s, i = 0; i < n; p++, q++, i++) {
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				if(*p == '\n')
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					l++;
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				if(*p != *q){
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					if(!lflag){
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						print("%s %s differ: char %lld",
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						    name1, name2, nc+i);
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						print(Lflag?" line %lld\n":"\n", l);
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						exits("differ");
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					}
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					print("%6lld 0x%.2x 0x%.2x\n", nc+i, *p, *q);
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				}
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			}
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		}
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		if(Lflag)
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			for(p = b1s; p < b1e;)
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				if(*p++ == '\n')
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					l++;
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		nc += n;
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		b1s += n;
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		b2s += n;
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	}
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	if (b1e - b1s < 0 || b2e - b2s < 0) {
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		if (!sflag) {
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			if (b1e - b1s < 0)
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				print("error on %s after %lld bytes\n",
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					name1, nc-1);
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			if (b2e - b2s < 0)
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				print("error on %s after %lld bytes\n",
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					name2, nc-1);
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		}
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		exits("read error");
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	}
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	if(b1e - b1s == b2e - b2s)
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		exits((char *)0);
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	if(!sflag)
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		print("EOF on %s after %lld bytes\n",
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			(b1e - b1s > b2e - b2s)? name2 : name1, nc-1);
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	exits("EOF");
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}
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static void
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usage(void)
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{
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	print("usage: cmp [-lLs] file1 file2 [offset1 [offset2] ]\n");
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	exits("usage");
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}