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95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Uncompress applet for busybox (c) 2002 Glenn McGrath
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "busybox.h"
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#include "unarchive.h"
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#define GUNZIP_TO_STDOUT 1
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#define GUNZIP_FORCE 2
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int uncompress_main(int argc, char **argv)
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{
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int status = EXIT_SUCCESS;
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unsigned long flags;
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flags = getopt32(argc, argv, "cf");
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while (optind < argc) {
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char *compressed_file = argv[optind++];
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char *delete_path = NULL;
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char *uncompressed_file = NULL;
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int src_fd;
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int dst_fd;
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if (LONE_DASH(compressed_file)) {
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src_fd = STDIN_FILENO;
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flags |= GUNZIP_TO_STDOUT;
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} else {
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src_fd = xopen(compressed_file, O_RDONLY);
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}
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/* Check that the input is sane. */
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if (isatty(src_fd) && ((flags & GUNZIP_FORCE) == 0)) {
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bb_error_msg_and_die
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("compressed data not read from terminal. Use -f to force it.");
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}
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/* Set output filename and number */
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if (flags & GUNZIP_TO_STDOUT) {
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dst_fd = STDOUT_FILENO;
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} else {
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struct stat stat_buf;
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char *extension;
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uncompressed_file = xstrdup(compressed_file);
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extension = strrchr(uncompressed_file, '.');
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if (!extension || (strcmp(extension, ".Z") != 0)) {
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bb_error_msg_and_die("invalid extension");
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}
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*extension = '\0';
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/* Open output file */
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xstat(compressed_file, &stat_buf);
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dst_fd = xopen3(uncompressed_file,
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O_WRONLY | O_CREAT | O_TRUNC,
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stat_buf.st_mode);
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/* If unzip succeeds remove the old file */
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delete_path = compressed_file;
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}
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/* do the decompression, and cleanup */
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if ((xread_char(src_fd) != 0x1f) || (xread_char(src_fd) != 0x9d)) {
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bb_error_msg_and_die("invalid magic");
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}
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status = uncompress(src_fd, dst_fd);
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if ((status != EXIT_SUCCESS) && (uncompressed_file)) {
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/* Unzip failed, remove the uncomressed file instead of compressed file */
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delete_path = uncompressed_file;
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}
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if (dst_fd != STDOUT_FILENO) {
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close(dst_fd);
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}
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if (src_fd != STDIN_FILENO) {
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close(src_fd);
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}
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/* delete_path will be NULL if in test mode or from stdin */
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if (delete_path && (unlink(delete_path) == -1)) {
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bb_error_msg_and_die("cannot remove %s", delete_path);
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}
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free(uncompressed_file);
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}
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return status;
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}
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