1/*
2 * extend.c --- extend a file so that it has at least a specified
3 * 	number of blocks.
4 *
5 * Copyright (C) 1993, 1994, 1995 Theodore Ts'o.
6 *
7 * This file may be redistributed under the terms of the GNU Public
8 * License.
9 */
10
11#include <stdio.h>
12#include <unistd.h>
13#include <stdlib.h>
14#include <string.h>
15#include <sys/types.h>
16#include <fcntl.h>
17#include "../misc/nls-enable.h"
18
19static void usage(char *progname)
20{
21	fprintf(stderr, _("%s: %s filename nblocks blocksize\n"),
22		progname, progname);
23	exit(1);
24}
25
26
27int main(int argc, char **argv)
28{
29	char	*filename;
30	int	nblocks, blocksize;
31	int	fd;
32	char	*block;
33	int	ret;
34
35	if (argc != 4)
36		usage(argv[0]);
37
38	filename = argv[1];
39	nblocks = strtoul(argv[2], 0, 0) - 1;
40	blocksize = strtoul(argv[3], 0, 0);
41
42	if (nblocks < 0) {
43		fprintf(stderr, _("Illegal number of blocks!\n"));
44		exit(1);
45	}
46
47	block = malloc(blocksize);
48	if (block == 0) {
49		fprintf(stderr, _("Couldn't allocate block buffer (size=%d)\n"),
50			blocksize);
51		exit(1);
52	}
53	memset(block, 0, blocksize);
54
55	fd = open(filename, O_RDWR);
56	if (fd < 0) {
57		perror(filename);
58		exit(1);
59	}
60	ret = lseek(fd, nblocks*blocksize, SEEK_SET);
61	if (ret < 0) {
62		perror("lseek");
63		exit(1);
64	}
65	ret = read(fd, block, blocksize);
66	if (ret < 0) {
67		perror("read");
68		exit(1);
69	}
70	ret = lseek(fd, nblocks*blocksize, SEEK_SET);
71	if (ret < 0) {
72		perror("lseek #2");
73		exit(1);
74	}
75	ret = write(fd, block, blocksize);
76	if (ret < 0) {
77		perror("read");
78		exit(1);
79	}
80	exit(0);
81}
82