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	fallocate.c - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	fallocate.c (987B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <sys/stat.h>
	3
	4 #include <fcntl.h>
	5 #include <limits.h>
	6 #include <stdint.h>
	7 #include <stdio.h>
	8 #include <stdlib.h>
	9 #include <unistd.h>
	10
	11 #include "util.h"
	12
	13 static void
	14 usage(void)
	15 {
	16 eprintf("usage: %s [-o num] -l num file ...\n", argv0);
	17 }
	18
	19 int
	20 main(int argc, char *argv[])
	21 {
	22 int fd, ret = 0;
	23 off_t size = 0, offset = 0;
	24
	25 ARGBEGIN {
	26 case 'l':
	27 size = estrtonum(EARGF(usage()), 1, MIN(LLONG_MAX, SIZE_…
	28 break;
	29 case 'o':
	30 offset = estrtonum(EARGF(usage()), 0, MIN(LLONG_MAX, SIZ…
	31 break;
	32 default:
	33 usage();
	34 } ARGEND;
	35
	36 if (!argc \|\| !size)
	37 usage();
	38
	39 for (; *argv; argc--, argv++) {
	40 if ((fd = open(*argv, O_RDWR \| O_CREAT, 0644)) < 0) {
	41 weprintf("open %s:", *argv);
	42 ret = 1;
	43 } else if (posix_fallocate(fd, offset, size) < 0) {
	44 weprintf("posix_fallocate %s:", *argv);
	45 ret = 1;
	46 }
	47
	48 if (fd >= 0 && close(fd) < 0) {
	49 weprintf("close %s:", *argv);
	50 ret = 1;
	51 }
	52 }
	53
	54 return ret;
	55 }