- cmp();
- /*NOTREACHED*/
-}
-
-/*
- * skip --
- * skip first part of file
- */
-skip(dist, fd, fname)
- register u_long dist;
- register int fd;
- char *fname;
-{
- register int rlen, nread;
-
- for (; dist; dist -= rlen) {
- rlen = MIN(dist, sizeof(buf1));
- if ((nread = read(fd, buf1, rlen)) != rlen) {
- if (nread < 0)
- error(fname);
- else
- endoffile(fname);
- }
- }
-}
-
-cmp()
-{
- register u_char *p1, *p2;
- register int cnt, len1, len2;
- register long byte, line;
- int dfound = 0;
-
- for (byte = 0, line = 1; ; ) {
- switch (len1 = read(fd1, buf1, MAXBSIZE)) {
- case -1:
- error(file1);
- case 0:
- /*
- * read of file 1 just failed, find out
- * if there's anything left in file 2
- */
- switch (read(fd2, buf2, 1)) {
- case -1:
- error(file2);
- /* NOTREACHED */
- case 0:
- exit(dfound ? EXITDIFF : EXITNODIFF);
- /* NOTREACHED */
- default:
- endoffile(file1);
- break;
- }
- }
- /*
- * file1 might be stdio, which means that a read of less than
- * MAXBSIZE might not mean an EOF. So, read whatever we read
- * from file1 from file2.
- */
- if ((len2 = read(fd2, buf2, len1)) == -1)
- error(file2);
- if (bcmp(buf1, buf2, len2)) {
- if (silent)
- exit(EXITDIFF);
- if (all) {
- dfound = 1;
- for (p1 = buf1, p2 = buf2, cnt = len2; cnt--;
- ++p1, ++p2) {
- ++byte;
- if (*p1 != *p2)
- printf("%6ld %3o %3o\n",
- byte, *p1, *p2);
- }
- } else for (p1 = buf1, p2 = buf2; ; ++p1, ++p2) {
- ++byte;
- if (*p1 != *p2) {
- printf("%s %s differ: char %ld, line %ld\n", file1, file2, byte, line);
- exit(EXITDIFF);
- }
- if (*p1 == '\n')
- ++line;
- }
- } else {
- byte += len2;
- /*
- * here's the real performance problem, we've got to
- * count the stupid lines, which means that -l is a
- * *much* faster version, i.e., unless you really
- * *want* to know the line number, run -s or -l.
- */
- if (!silent && !all)
- for (p1 = buf1, cnt = len2; cnt--; )
- if (*p1++ == '\n')
- ++line;
+ else if ((fd2 = open(file2, O_RDONLY, 0)) < 0)
+ err("%s: %s", file2, strerror(errno));
+
+ skip1 = argc > 2 ? strtol(argv[2], NULL, 10) : 0;
+ skip2 = argc == 4 ? strtol(argv[3], NULL, 10) : 0;
+
+ if (!special) {
+ if (fstat(fd1, &sb1))
+ err("%s: %s", file1, strerror(errno));
+ if (!S_ISREG(sb1.st_mode))
+ special = 1;
+ else {
+ if (fstat(fd2, &sb2))
+ err("%s: %s", file2, strerror(errno));
+ if (!S_ISREG(sb2.st_mode))
+ special = 1;