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- /* cmp.c - Compare two files.
- *
- * Copyright 2012 Timothy Elliott <tle@holymonkey.com>
- *
- * See http://opengroup.org/onlinepubs/9699919799/utilities/cmp.html
- USE_CMP(NEWTOY(cmp, "<1>4ls(silent)(quiet)n#<1[!ls]", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_ARGFAIL(2)))
- config CMP
- bool "cmp"
- default y
- help
- usage: cmp [-ls] [-n LEN] FILE1 [FILE2 [SKIP1 [SKIP2]]]
- Compare the contents of files (vs stdin if only one given), optionally
- skipping bytes at start.
- -l Show all differing bytes
- -n LEN Compare at most LEN bytes
- -s Silent
- */
- #define FOR_cmp
- #include "toys.h"
- GLOBALS(
- long n;
- int fd;
- char *name;
- )
- // We hijack loopfiles() to open and understand the "-" filename for us.
- static void do_cmp(int fd, char *name)
- {
- int i, len1, len2, min_len, size = sizeof(toybuf)/2;
- long byte_no = 1, line_no = 1;
- char *buf2 = toybuf+size;
- if (toys.optc>(i = 2+!!TT.fd) && lskip(fd, atolx(toys.optargs[i])))
- error_exit("EOF on %s", name);
- // First time through, cache the data and return.
- if (!TT.fd) {
- TT.name = name;
- // On return the old filehandle is closed, and this assures that even
- // if we were called with stdin closed, the new filehandle != 0.
- TT.fd = dup(fd);
- return;
- }
- toys.exitval = 0;
- for (;!FLAG(n) || TT.n;) {
- if (FLAG(n)) TT.n -= size = minof(size, TT.n);
- len1 = readall(TT.fd, toybuf, size);
- len2 = readall(fd, buf2, size);
- min_len = minof(len1, len2);
- for (i=0; i<min_len; i++) {
- if (toybuf[i] != buf2[i]) {
- toys.exitval = 1;
- if (FLAG(l)) printf("%ld %o %o\n", byte_no, toybuf[i], buf2[i]);
- else {
- if (!FLAG(s)) printf("%s %s differ: char %ld, line %ld\n",
- TT.name, name, byte_no, line_no);
- goto out;
- }
- }
- byte_no++;
- if (toybuf[i] == '\n') line_no++;
- }
- if (len1 != len2) {
- if (!FLAG(s)) error_msg("EOF on %s", len1 < len2 ? TT.name : name);
- else toys.exitval = 1;
- break;
- }
- if (len1 < 1) break;
- }
- out:
- if (CFG_TOYBOX_FREE) close(TT.fd);
- xexit();
- }
- void cmp_main(void)
- {
- toys.exitval = 2;
- loopfiles_rw(toys.optargs, O_CLOEXEC|(WARN_ONLY*!FLAG(s)), 0, do_cmp);
- if (toys.optc == 1) do_cmp(0, "-");
- }
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