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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, "<2>2ls", TOYFLAG_USR|TOYFLAG_BIN))
config CMP
bool "cmp"
default y
help
usage: cmp [-l] [-s] FILE1 FILE2
Compare the contents of two files.
-l show all differing bytes
-s silent
*/
#define FOR_cmp
#include "toys.h"
GLOBALS(
int fd;
char *name;
)
// This handles opening the file and
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;
// 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;
}
for (;;) {
len1 = readall(TT.fd, toybuf, size);
len2 = readall(fd, buf2, size);
min_len = len1 < len2 ? len1 : len2;
for (i=0; i<min_len; i++) {
if (toybuf[i] != buf2[i]) {
toys.exitval = 1;
if (toys.optflags & FLAG_l)
printf("%ld %o %o\n", byte_no, toybuf[i], buf2[i]);
else {
if (!(toys.optflags & FLAG_s)) {
printf("%s %s differ: char %ld, line %ld\n",
TT.name, name, byte_no, line_no);
toys.exitval++;
}
goto out;
}
}
byte_no++;
if (toybuf[i] == '\n') line_no++;
}
if (len1 != len2) {
if (!(toys.optflags & FLAG_s))
fprintf(stderr, "cmp: EOF on %s\n", len1 < len2 ? TT.name : name);
toys.exitval = 1;
break;
}
if (len1 < 1) break;
}
out:
if (CFG_TOYBOX_FREE) close(TT.fd);
}
void cmp_main(void)
{
loopfiles_rw(toys.optargs, O_CLOEXEC, 0, toys.optflags&FLAG_s, do_cmp);
}
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