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truncate.c - ubase - suckless linux base utils
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truncate.c (895B)
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1 /* See LICENSE file for copyright and license details. */
2 #include <sys/stat.h>
3
4 #include <fcntl.h>
5 #include <stdio.h>
6 #include <stdlib.h>
7 #include <unistd.h>
8
9 #include "util.h"
10
11 static void
12 usage(void)
13 {
14 eprintf("usage: %s [-c] -s size file...\n", argv0);
15 }
16
17 int
18 main(int argc, char *argv[])
19 {
20 int cflag = 0, sflag = 0;
21 int fd, i, ret = 0;
22 long size = 0;
23
24 ARGBEGIN {
25 case 's':
26 sflag = 1;
27 size = estrtol(EARGF(usage()), 10);
28 break;
29 case 'c':
30 cflag = 1;
31 break;
32 default:
33 usage();
34 } ARGEND;
35
36 if (argc < 1 || sflag == 0)
37 usage();
38
39 for (i = 0; i < argc; i++) {
40 fd = open(argv[i], O_WRONLY | (cflag ? 0 : O_CREAT), 064…
41 if (fd < 0) {
42 weprintf("open: cannot open `%s' for writing:", …
43 ret = 1;
44 continue;
45 }
46 if (ftruncate(fd, size) < 0) {
47 weprintf("ftruncate: cannot open `%s' for writin…
48 ret = 1;
49 }
50 close(fd);
51 }
52 return ret;
53 }
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