1/* See LICENSE file for copyright and license details. */
 2
 3
 4#include <sys/stat.h>
 5
 6#include <fcntl.h>
 7#include <limits.h>
 8#include <stdint.h>
 9#include <stdio.h>
10#include <stdlib.h>
11#include <unistd.h>
12
13#include "util.h"
14
15static void
16usage(void)
17{
18	eprintf("usage: %s [-o num] -l num file ...\n", argv0);
19}
20
21// ?man fallocate: preallocate file space
22// ?man arguments: -l num file ...
23// ?man preallocate or deallocate space to a file
24int
25main(int argc, char *argv[])
26{
27	int fd, ret = 0;
28	off_t size = 0, offset = 0;
29
30	ARGBEGIN {
31	// ?man -l:num: list in long format
32	case 'l':
33		size = estrtonum(EARGF(usage()), 1, MIN((unsigned long long)LLONG_MAX, (unsigned long long)SIZE_MAX));
34		break;
35	// ?man -o:num: specify output file
36	case 'o':
37		offset = estrtonum(EARGF(usage()), 0, MIN((unsigned long long)LLONG_MAX, (unsigned long long)SIZE_MAX));
38		break;
39	default:
40		usage();
41	} ARGEND;
42
43	if (!argc || !size)
44		usage();
45
46	for (; *argv; argc--, argv++) {
47		if ((fd = open(*argv, O_RDWR | O_CREAT, 0644)) < 0) {
48			weprintf("open %s:", *argv);
49			ret = 1;
50		} else if (posix_fallocate(fd, offset, size) < 0) {
51			weprintf("posix_fallocate %s:", *argv);
52			ret = 1;
53		}
54
55		if (fd >= 0 && close(fd) < 0) {
56			weprintf("close %s:", *argv);
57			ret = 1;
58		}
59	}
60
61	return ret;
62}