1 /* vi: set sw=4 ts=4: */
3 * Uncompress applet for busybox (c) 2002 Glenn McGrath
5 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
11 #include <sys/types.h>
16 #include "unarchive.h"
18 #define GUNZIP_TO_STDOUT 1
19 #define GUNZIP_FORCE 2
21 int uncompress_main(int argc, char **argv)
23 int status = EXIT_SUCCESS;
26 flags = bb_getopt_ulflags(argc, argv, "cf");
28 while (optind < argc) {
29 const char *compressed_file = argv[optind++];
30 const char *delete_path = NULL;
31 char *uncompressed_file = NULL;
35 if (strcmp(compressed_file, "-") == 0) {
36 src_fd = STDIN_FILENO;
37 flags |= GUNZIP_TO_STDOUT;
39 src_fd = bb_xopen(compressed_file, O_RDONLY);
42 /* Check that the input is sane. */
43 if (isatty(src_fd) && ((flags & GUNZIP_FORCE) == 0)) {
45 ("compressed data not read from terminal. Use -f to force it.");
48 /* Set output filename and number */
49 if (flags & GUNZIP_TO_STDOUT) {
50 dst_fd = STDOUT_FILENO;
55 uncompressed_file = bb_xstrdup(compressed_file);
57 extension = strrchr(uncompressed_file, '.');
58 if (!extension || (strcmp(extension, ".Z") != 0)) {
59 bb_error_msg_and_die("Invalid extension");
63 /* Open output file */
64 dst_fd = bb_xopen(uncompressed_file, O_WRONLY | O_CREAT);
66 /* Set permissions on the file */
67 stat(compressed_file, &stat_buf);
68 chmod(uncompressed_file, stat_buf.st_mode);
70 /* If unzip succeeds remove the old file */
71 delete_path = compressed_file;
74 /* do the decompression, and cleanup */
75 if ((bb_xread_char(src_fd) != 0x1f) || (bb_xread_char(src_fd) != 0x9d)) {
76 bb_error_msg_and_die("Invalid magic");
79 status = uncompress(src_fd, dst_fd);
81 if ((status != EXIT_SUCCESS) && (uncompressed_file)) {
82 /* Unzip failed, remove the uncomressed file instead of compressed file */
83 delete_path = uncompressed_file;
86 if (dst_fd != STDOUT_FILENO) {
89 if (src_fd != STDIN_FILENO) {
93 /* delete_path will be NULL if in test mode or from stdin */
94 if (delete_path && (unlink(delete_path) == -1)) {
95 bb_error_msg_and_die("Couldn't remove %s", delete_path);
98 free(uncompressed_file);