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comparison toys/posix/cmp.c @ 653:2986aa63a021

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Move commands into "posix", "lsb", and "other" menus/directories.
author Rob Landley <rob@landley.net>
date Sat, 25 Aug 2012 14:25:22 -0500
parents toys/cmp.c@26098529bbe6
children 6df4ccc0acbe
comparison
equal deleted inserted replaced
652:2d7c56913fda 653:2986aa63a021
1 /* vi: set sw=4 ts=4:
2 *
3 * cmp.c - Compare two files.
4 *
5 * Copyright 2012 Timothy Elliott <tle@holymonkey.com>
6 *
7 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/cmp.html
8
9 USE_CMP(NEWTOY(cmp, "<2>2ls", TOYFLAG_USR|TOYFLAG_BIN))
10
11 config CMP
12 bool "cmp"
13 default y
14 help
15 usage: cmp [-l] [-s] FILE1 FILE2
16
17 Compare the contents of two files.
18
19 -l show all differing bytes
20 -s silent
21 */
22
23 #include "toys.h"
24
25 #define FLAG_s 1
26 #define FLAG_l 2
27
28 DEFINE_GLOBALS(
29 int fd;
30 char *name;
31 )
32
33 #define TT this.cmp
34
35 // This handles opening the file and
36
37 void do_cmp(int fd, char *name)
38 {
39 int i, len1, len2, min_len, size = sizeof(toybuf)/2;
40 long byte_no = 1, line_no = 1;
41 char *buf2 = toybuf+size;
42
43 // First time through, cache the data and return.
44 if (!TT.fd) {
45 TT.name = name;
46 // On return the old filehandle is closed, and this assures that even
47 // if we were called with stdin closed, the new filehandle != 0.
48 TT.fd = dup(fd);
49 return;
50 }
51
52 for (;;) {
53 len1 = readall(TT.fd, toybuf, size);
54 len2 = readall(fd, buf2, size);
55
56 min_len = len1 < len2 ? len1 : len2;
57 for (i=0; i<min_len; i++) {
58 if (toybuf[i] != buf2[i]) {
59 toys.exitval = 1;
60 if (toys.optflags & FLAG_l)
61 printf("%ld %o %o\n", byte_no, toybuf[i], buf2[i]);
62 else {
63 if (!(toys.optflags & FLAG_s)) {
64 printf("%s %s differ: char %ld, line %ld\n",
65 TT.name, name, byte_no, line_no);
66 toys.exitval++;
67 }
68 goto out;
69 }
70 }
71 byte_no++;
72 if (toybuf[i] == '\n') line_no++;
73 }
74 if (len1 != len2) {
75 if (!(toys.optflags & FLAG_s)) {
76 fprintf(stderr, "cmp: EOF on %s\n",
77 len1 < len2 ? TT.name : name);
78 }
79 toys.exitval = 1;
80 break;
81 }
82 if (len1 < 1) break;
83 }
84 out:
85 if (CFG_TOYBOX_FREE) close(TT.fd);
86 }
87
88 void cmp_main(void)
89 {
90 loopfiles_rw(toys.optargs, O_RDONLY, 0, toys.optflags&FLAG_s, do_cmp);
91 }
92