Mercurial > hg > toybox

annotate toys/cat.c @ 381:5d4dacab7be0

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
SUSv4 is out, update template link.
author Rob Landley <rob@landley.net>
date Tue, 15 Nov 2011 01:09:27 -0600
parents d1ae502ee190
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
279
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
1 /* vi: set sw=4 ts=4:
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
2 *
313
d1ae502ee190 An error from an input file isn't fatal, keep reading remaining input files.
Rob Landley <rob@landley.net>
parents: 281
diff changeset
3 * cat.c - copy inputs to stdout.
279
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
4 *
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
5 * Copyright 2006 Rob Landley <rob@landley.net>
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
6 *
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
7 * See http://www.opengroup.org/onlinepubs/009695399/utilities/cat.html
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
8
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
9 USE_CAT(NEWTOY(cat, "u", TOYFLAG_BIN))
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
10
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
11 config CAT
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
12 bool "cat"
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
13 default y
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
14 help
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
15 usage: cat [-u] [file...]
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
16 Copy (concatenate) files to stdout. If no files listed, copy from stdin.
313
d1ae502ee190 An error from an input file isn't fatal, keep reading remaining input files.
Rob Landley <rob@landley.net>
parents: 281
diff changeset
17 Filename "-" is a synonym for stdin.
279
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
18
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
19 -u Copy one byte at a time (slow).
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
20 */
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
21
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
22 #include "toys.h"
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
23
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
24 static void do_cat(int fd, char *name)
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
25 {
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
26 int len, size=toys.optflags ? 1 : sizeof(toybuf);
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
27
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
28 for (;;) {
313
d1ae502ee190 An error from an input file isn't fatal, keep reading remaining input files.
Rob Landley <rob@landley.net>
parents: 281
diff changeset
29 len = read(fd, toybuf, size);
d1ae502ee190 An error from an input file isn't fatal, keep reading remaining input files.
Rob Landley <rob@landley.net>
parents: 281
diff changeset
30 if (len<0) {
d1ae502ee190 An error from an input file isn't fatal, keep reading remaining input files.
Rob Landley <rob@landley.net>
parents: 281
diff changeset
31 perror_msg("%s",name);
d1ae502ee190 An error from an input file isn't fatal, keep reading remaining input files.
Rob Landley <rob@landley.net>
parents: 281
diff changeset
32 toys.exitval = EXIT_FAILURE;
d1ae502ee190 An error from an input file isn't fatal, keep reading remaining input files.
Rob Landley <rob@landley.net>
parents: 281
diff changeset
33 }
279
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
34 if (len<1) break;
281
1c160cadf5b9 Thinko in cat.
Rob Landley <rob@landley.net>
parents: 279
diff changeset
35 xwrite(1, toybuf, len);
279
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
36 }
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
37 }
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
38
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
39 void cat_main(void)
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
40 {
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
41 loopfiles(toys.optargs, do_cat);
0ca2fcee572b Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
parents:
diff changeset
42 }