1 /*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <fcntl.h>
18 #include <libgen.h>
19 #include <stdio.h>
20 #include <unistd.h>
21 #include <stdlib.h>
22
23 #if defined(__linux__)
24 #include <linux/fs.h>
25 #elif defined(__APPLE__) && defined(__MACH__)
26 #include <sys/disk.h>
27 #endif
28
29 #ifndef USE_MINGW /* O_BINARY is windows-specific flag */
30 #define O_BINARY 0
31 #endif
32
usage(char * path)33 static void usage(char *path)
34 {
35 fprintf(stderr, "%s -l <len>\n", basename(path));
36 fprintf(stderr, " <filename>\n");
37 }
38
main(int argc,char ** argv)39 int main(int argc, char **argv)
40 {
41 int opt;
42 const char *filename = NULL;
43 int fd;
44 int exitcode;
45 long long len;
46 while ((opt = getopt(argc, argv, "l:")) != -1) {
47 switch (opt) {
48 case 'l':
49 len = atoll(optarg);
50 break;
51 default: /* '?' */
52 usage(argv[0]);
53 exit(EXIT_FAILURE);
54 }
55 }
56
57
58 if (optind >= argc) {
59 fprintf(stderr, "Expected filename after options\n");
60 usage(argv[0]);
61 exit(EXIT_FAILURE);
62 }
63
64 filename = argv[optind++];
65
66 if (optind < argc) {
67 fprintf(stderr, "Unexpected argument: %s\n", argv[optind]);
68 usage(argv[0]);
69 exit(EXIT_FAILURE);
70 }
71
72 if (strcmp(filename, "-")) {
73 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
74 if (fd < 0) {
75 perror("open");
76 return EXIT_FAILURE;
77 }
78 } else {
79 fd = STDOUT_FILENO;
80 }
81
82 exitcode = make_f2fs_sparse_fd(fd, len, NULL, NULL);
83
84 close(fd);
85 if (exitcode && strcmp(filename, "-"))
86 unlink(filename);
87 return exitcode;
88 }
89