11 static void usage(void);
14 seekoff(int fd, char *name, char **argv)
19 if (!isascii(**argv) || !isdigit(**argv))
21 o = strtoll(*argv++, 0, 0);
22 if(seek(fd, o, 0) < 0){
23 if(!sflag) fprint(2, "cmp: %s: seek by %lld: %r\n",
32 main(int argc, char *argv[])
36 uchar buf1[BUF], buf2[BUF];
40 uchar *b1s, *b1e, *b2s, *b2e;
43 case 's': sflag = 1; break;
44 case 'l': lflag = 1; break;
45 case 'L': Lflag = 1; break;
48 if(argc < 2 || argc > 4)
50 if((f1 = open(name1 = *argv++, OREAD)) == -1){
51 if(!sflag) perror(name1);
54 if((f2 = open(name2 = *argv++, OREAD)) == -1){
55 if(!sflag) perror(name2);
58 argv = seekoff(f1, name1, argv);
59 argv = seekoff(f2, name2, argv);
69 n = read(f1, b1s, &buf1[BUF] - b1s);
75 n = read(f2, b2s, &buf2[BUF] - b2s);
83 if(memcmp((void *)b1s, (void *)b2s, n) != 0){
86 for(p = b1s, q = b2s, i = 0; i < n; p++, q++, i++) {
91 print("%s %s differ: char %lld",
93 print(Lflag?" line %lld\n":"\n", l);
96 print("%6lld 0x%.2x 0x%.2x\n", nc+i, *p, *q);
101 for(p = b1s; p < b1e;)
108 if (b1e - b1s < 0 || b2e - b2s < 0) {
111 print("error on %s after %lld bytes\n",
114 print("error on %s after %lld bytes\n",
119 if(b1e - b1s == b2e - b2s)
122 print("EOF on %s after %lld bytes\n",
123 (b1e - b1s > b2e - b2s)? name2 : name1, nc-1);
130 print("usage: cmp [-lLs] file1 file2 [offset1 [offset2] ]\n");