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