1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
/* 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, "-");
}
|
