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cat.c (824B)
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1 /* See LICENSE file for copyright and license details. */
2 #include <fcntl.h>
3 #include <string.h>
4 #include <unistd.h>
5
6 #include "util.h"
7
8 static void
9 usage(void)
10 {
11 eprintf("usage: %s [-u] [file ...]\n", argv0);
12 }
13
14 int
15 main(int argc, char *argv[])
16 {
17 int fd, ret = 0;
18
19 ARGBEGIN {
20 case 'u':
21 break;
22 default:
23 usage();
24 } ARGEND
25
26 if (!argc) {
27 if (concat(0, "<stdin>", 1, "<stdout>") < 0)
28 ret = 1;
29 } else {
30 for (; *argv; argc--, argv++) {
31 if (!strcmp(*argv, "-")) {
32 *argv = "<stdin>";
33 fd = 0;
34 } else if ((fd = open(*argv, O_RDONLY)) < 0) {
35 weprintf("open %s:", *argv);
36 ret = 1;
37 continue;
38 }
39 switch (concat(fd, *argv, 1, "<stdout>")) {
40 case -1:
41 ret = 1;
42 break;
43 case -2:
44 return 1; /* exit on write error */
45 }
46 if (fd != 0)
47 close(fd);
48 }
49 }
50
51 return ret;
52 }
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