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Commit | Line | Data |
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50e1e10f TT |
1 | /* |
2 | * extend.c --- extend a file so that it has at least a specified | |
3 | * number of blocks. | |
efc6f628 | 4 | * |
50e1e10f TT |
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 | ||
d1154eb4 | 11 | #include "config.h" |
50e1e10f TT |
12 | #include <stdio.h> |
13 | #include <unistd.h> | |
14 | #include <stdlib.h> | |
15 | #include <string.h> | |
16 | #include <sys/types.h> | |
17 | #include <fcntl.h> | |
adfca56f | 18 | #include "../misc/nls-enable.h" |
50e1e10f TT |
19 | |
20 | static void usage(char *progname) | |
21 | { | |
0c4a0726 | 22 | fprintf(stderr, _("%s: %s filename nblocks blocksize\n"), |
50e1e10f TT |
23 | progname, progname); |
24 | exit(1); | |
25 | } | |
26 | ||
27 | ||
28 | int main(int argc, char **argv) | |
29 | { | |
30 | char *filename; | |
31 | int nblocks, blocksize; | |
32 | int fd; | |
33 | char *block; | |
34 | int ret; | |
35 | ||
36 | if (argc != 4) | |
37 | usage(argv[0]); | |
38 | ||
39 | filename = argv[1]; | |
40 | nblocks = strtoul(argv[2], 0, 0) - 1; | |
41 | blocksize = strtoul(argv[3], 0, 0); | |
42 | ||
43 | if (nblocks < 0) { | |
0c4a0726 | 44 | fprintf(stderr, _("Illegal number of blocks!\n")); |
50e1e10f TT |
45 | exit(1); |
46 | } | |
47 | ||
48 | block = malloc(blocksize); | |
49 | if (block == 0) { | |
0c4a0726 | 50 | fprintf(stderr, _("Couldn't allocate block buffer (size=%d)\n"), |
50e1e10f TT |
51 | blocksize); |
52 | exit(1); | |
53 | } | |
54 | memset(block, 0, blocksize); | |
55 | ||
56 | fd = open(filename, O_RDWR); | |
57 | if (fd < 0) { | |
58 | perror(filename); | |
59 | exit(1); | |
60 | } | |
61 | ret = lseek(fd, nblocks*blocksize, SEEK_SET); | |
62 | if (ret < 0) { | |
63 | perror("lseek"); | |
64 | exit(1); | |
65 | } | |
66 | ret = read(fd, block, blocksize); | |
67 | if (ret < 0) { | |
68 | perror("read"); | |
69 | exit(1); | |
70 | } | |
71 | ret = lseek(fd, nblocks*blocksize, SEEK_SET); | |
72 | if (ret < 0) { | |
73 | perror("lseek #2"); | |
74 | exit(1); | |
75 | } | |
76 | ret = write(fd, block, blocksize); | |
77 | if (ret < 0) { | |
78 | perror("read"); | |
79 | exit(1); | |
80 | } | |
81 | exit(0); | |
82 | } |