#include "busybox.h"const int gunzip_to_stdout = 1;
const int gunzip_force = 2;
const int gunzip_test = 4;
const int gunzip_verbose = 8;
static int gunzip_file (const char *path, int flags)
{
FILE *in_file, *out_file;
struct stat stat_buf;
const char *delete_path;
char *out_path = NULL;
if (path == NULL || strcmp (path, "-") == 0) {
in_file = stdin;
flags |= gunzip_to_stdout;
} else {
if ((in_file = wfopen(path, "r")) == NULL)
return -1;
if (flags & gunzip_verbose) {
fprintf(stderr, "%s:\t", path);
}
/* set the buffer size */
setvbuf(in_file, NULL, _IOFBF, 0x8000);
/* Get the time stamp on the input file. */
if (stat(path, &stat_buf) < 0) {
error_msg_and_die("Couldn't stat file %s", path);
}
}
/* Check that the input is sane. */
if (isatty(fileno(in_file)) && (flags & gunzip_force) == 0)
error_msg_and_die("compressed data not read from terminal. Use -f to force it.");
/* Set output filename and number */
if (flags & gunzip_test) {
out_file = xfopen("/dev/null", "w"); /* why does test use filenum 2 ? */
} else if (flags & gunzip_to_stdout) {
out_file = stdout;
} else {
char *extension;
int length = strlen(path);
extension = strrchr(path, '.');
if (extension && strcmp(extension, ".gz") == 0) {
length -= 3;
} else if (extension && strcmp(extension, ".tgz") == 0) {
length -= 4;
} else {
error_msg_and_die("Invalid extension");
}
out_path = (char *) xcalloc(sizeof(char), length + 1);
strncpy(out_path, path, length);
/* Open output file */
out_file = xfopen(out_path, "w");
/* Set permissions on the file */
chmod(out_path, stat_buf.st_mode);
}
/* do the decompression, and cleanup */
if (unzip(in_file, out_file) == 0) {
/* Success, remove .gz file */
delete_path = path;
if (flags & gunzip_verbose) {
fprintf(stderr, "OK\n");
}
} else {
/* remove failed attempt */
delete_path = out_path;
}
fclose(out_file);
fclose(in_file);
if (delete_path && !(flags & gunzip_test)) {
if (unlink(delete_path) < 0) {
error_msg_and_die("Couldn't remove %s", delete_path);
}
}
free(out_path);
return 0;
}
extern int gunzip_main(int argc, char **argv)
{
int flags = 0;
int i, opt;
int status = EXIT_SUCCESS;
/* if called as zcat */
if (strcmp(applet_name, "zcat") == 0)
flags |= gunzip_to_stdout;
while ((opt = getopt(argc, argv, "ctfhdqv")) != -1) {
switch (opt) {
case 'c':
flags |= gunzip_to_stdout;
break;
case 'f':
flags |= gunzip_force;
break;
case 't':
flags |= gunzip_test;
break;
case 'v':
flags |= gunzip_verbose;
break;
case 'd': /* Used to convert gzip to gunzip. */
break;
case 'q':
error_msg("-q option not supported, ignored");
break;
case 'h':
default:
show_usage(); /* exit's inside usage */
}
}
if (optind == argc) {
if (gunzip_file (NULL, flags) < 0)
status = EXIT_FAILURE;
} else
for (i = optind; i < argc; i++)
if (gunzip_file (argv[i], flags) < 0)
status = EXIT_FAILURE;
return status;
}
