1/*
2 * Copyright 2008, Axel Dörfler, axeld@pinc-software.de.
3 * Distributed under the terms of the MIT License.
4 */
5
6
7#include <ctype.h>
8#include <errno.h>
9#include <stdio.h>
10#include <stdlib.h>
11#include <string.h>
12#include <sys/stat.h>
13#include <unistd.h>
14
15
16extern const char *__progname;
17
18
19int
20main(int argc, char **argv)
21{
22	if (argc < 3) {
23		fprintf(stderr, "usage: %s <file> <size>\n", __progname);
24		return 1;
25	}
26
27	struct stat st;
28	if (stat(argv[1], &st) != 0) {
29		fprintf(stderr, "%s: cannot stat file \"%s\": %s\n", __progname,
30			argv[1], strerror(errno));
31		return 1;
32	}
33
34	off_t newSize = strtoll(argv[2], NULL, 0);
35
36	printf("size   %10Ld\n", st.st_size);
37	printf("wanted %10Ld\n", newSize);
38	printf("Do you really want to truncate the file [y/N]? ");
39	fflush(stdout);
40
41	char yes[10];
42	if (fgets(yes, sizeof(yes), stdin) == NULL || tolower(yes[0]) != 'y')
43		return 0;
44
45	if (truncate(argv[1], newSize) != 0) {
46		fprintf(stderr, "%s: cannot truncate file \"%s\": %s\n", __progname,
47			argv[1], strerror(errno));
48		return 1;
49	}
50
51	return 0;
52}
53