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	truncate.c - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	truncate.c (895B)
	---
	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 }