truncate.c - ubase - suckless linux base utils | |
git clone git://git.suckless.org/ubase | |
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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 } |