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gzip.c
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/* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
Copyright (C) 1999, 2001-2002, 2006-2007, 2009-2013 Free Software
Foundation, Inc.
Copyright (C) 1992-1993 Jean-loup Gailly
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/*
* The unzip code was written and put in the public domain by Mark Adler.
* Portions of the lzw code are derived from the public domain 'compress'
* written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
* Ken Turkowski, Dave Mack and Peter Jannesen.
*
* See the license_msg below and the file COPYING for the software license.
* See the file algorithm.doc for the compression algorithms and file formats.
*/
static char const *const license_msg[] = {
"Copyright (C) 2007, 2010, 2011 Free Software Foundation, Inc.",
"Copyright (C) 1993 Jean-loup Gailly.",
"This is free software. You may redistribute copies of it under the terms of",
"the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.",
"There is NO WARRANTY, to the extent permitted by law.",
0};
/* Compress files with zip algorithm and 'compress' interface.
* See help() function below for all options.
* Outputs:
* file.gz: compressed file with same mode, owner, and utimes
* or stdout with -c option or if stdin used as input.
* If the output file name had to be truncated, the original name is kept
* in the compressed file.
* On MSDOS, file.tmp -> file.tmz. On VMS, file.tmp -> file.tmp-gz.
*
* Using gz on MSDOS would create too many file name conflicts. For
* example, foo.txt -> foo.tgz (.tgz must be reserved as shorthand for
* tar.gz). Similarly, foo.dir and foo.doc would both be mapped to foo.dgz.
* I also considered 12345678.txt -> 12345txt.gz but this truncates the name
* too heavily. There is no ideal solution given the MSDOS 8+3 limitation.
*
* For the meaning of all compilation flags, see comments in Makefile.in.
*/
#include <config.h>
#include <ctype.h>
#include <sys/types.h>
#include <signal.h>
#include <stdbool.h>
#include <sys/stat.h>
#include <errno.h>
#include "closein.h"
#include "tailor.h"
#include "gzip.h"
#include "lzw.h"
#include "revision.h"
#include "timespec.h"
#include "fcntl-safer.h"
#include "getopt.h"
#include "ignore-value.h"
#include "stat-time.h"
#include "version.h"
#include "yesno.h"
/* configuration */
#include <fcntl.h>
#include <limits.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#ifndef NO_DIR
# define NO_DIR 0
#endif
#if !NO_DIR
# include <dirent.h>
# include <savedir.h>
#endif
#ifndef NO_UTIME
# include <utimens.h>
#endif
#define RW_USER (S_IRUSR | S_IWUSR) /* creation mode for open() */
#ifndef MAX_PATH_LEN
# define MAX_PATH_LEN 1024 /* max pathname length */
#endif
#ifndef SEEK_END
# define SEEK_END 2
#endif
#ifndef CHAR_BIT
# define CHAR_BIT 8
#endif
#ifdef off_t
off_t lseek (int fd, off_t offset, int whence);
#endif
#ifndef OFF_T_MIN
#define OFF_T_MIN (~ (off_t) 0 << (sizeof (off_t) * CHAR_BIT - 1))
#endif
#ifndef OFF_T_MAX
#define OFF_T_MAX (~ (off_t) 0 - OFF_T_MIN)
#endif
/* Use SA_NOCLDSTOP as a proxy for whether the sigaction machinery is
present. */
#ifndef SA_NOCLDSTOP
# define SA_NOCLDSTOP 0
# define sigprocmask(how, set, oset) /* empty */
# define sigset_t int
# if ! HAVE_SIGINTERRUPT
# define siginterrupt(sig, flag) /* empty */
# endif
#endif
#ifndef HAVE_WORKING_O_NOFOLLOW
# define HAVE_WORKING_O_NOFOLLOW 0
#endif
/* Separator for file name parts (see shorten_name()) */
#ifdef NO_MULTIPLE_DOTS
# define PART_SEP "-"
#else
# define PART_SEP "."
#endif
/* global buffers */
DECLARE(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
DECLARE(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
DECLARE(ush, d_buf, DIST_BUFSIZE);
DECLARE(uch, window, 2L*WSIZE);
#ifndef MAXSEG_64K
DECLARE(ush, tab_prefix, 1L<<BITS);
#else
DECLARE(ush, tab_prefix0, 1L<<(BITS-1));
DECLARE(ush, tab_prefix1, 1L<<(BITS-1));
#endif
/* local variables */
/* If true, pretend that standard input is a tty. This option
is deliberately not documented, and only for testing. */
static bool presume_input_tty;
static int ascii = 0; /* convert end-of-lines to local OS conventions */
int to_stdout = 0; /* output to stdout (-c) */
static int decompress = 0; /* decompress (-d) */
static int force = 0; /* don't ask questions, compress links (-f) */
static int keep = 0; /* keep (don't delete) input files */
static int no_name = -1; /* don't save or restore the original file name */
static int no_time = -1; /* don't save or restore the original file time */
static int recursive = 0; /* recurse through directories (-r) */
static int list = 0; /* list the file contents (-l) */
int verbose = 0; /* be verbose (-v) */
int quiet = 0; /* be very quiet (-q) */
static int do_lzw = 0; /* generate output compatible with old compress (-Z) */
int test = 0; /* test .gz file integrity */
static int foreground = 0; /* set if program run in foreground */
char *program_name; /* program name */
int maxbits = BITS; /* max bits per code for LZW */
int method = DEFLATED;/* compression method */
int level = 6; /* compression level */
int exit_code = OK; /* program exit code */
int save_orig_name; /* set if original name must be saved */
static int last_member; /* set for .zip and .Z files */
static int part_nb; /* number of parts in .gz file */
struct timespec time_stamp; /* original time stamp (modification time) */
off_t ifile_size; /* input file size, -1 for devices (debug only) */
static char *env; /* contents of GZIP env variable */
static char **args = NULL; /* argv pointer if GZIP env variable defined */
static char const *z_suffix; /* default suffix (can be set with --suffix) */
static size_t z_len; /* strlen(z_suffix) */
/* The set of signals that are caught. */
static sigset_t caught_signals;
/* If nonzero then exit with status WARNING, rather than with the usual
signal status, on receipt of a signal with this value. This
suppresses a "Broken Pipe" message with some shells. */
static int volatile exiting_signal;
/* If nonnegative, close this file descriptor and unlink ofname on error. */
static int volatile remove_ofname_fd = -1;
off_t bytes_in; /* number of input bytes */
off_t bytes_out; /* number of output bytes */
static off_t total_in; /* input bytes for all files */
static off_t total_out; /* output bytes for all files */
char ifname[MAX_PATH_LEN]; /* input file name */
char ofname[MAX_PATH_LEN]; /* output file name */
static struct stat istat; /* status for input file */
int ifd; /* input file descriptor */
int ofd; /* output file descriptor */
unsigned insize; /* valid bytes in inbuf */
unsigned inptr; /* index of next byte to be processed in inbuf */
unsigned outcnt; /* bytes in output buffer */
static int handled_sig[] =
{
/* SIGINT must be first, as 'foreground' depends on it. */
SIGINT
#ifdef SIGHUP
, SIGHUP
#endif
#if SIGPIPE
, SIGPIPE
#endif
#ifdef SIGTERM
, SIGTERM
#endif
#ifdef SIGXCPU
, SIGXCPU
#endif
#ifdef SIGXFSZ
, SIGXFSZ
#endif
};
/* For long options that have no equivalent short option, use a
non-character as a pseudo short option, starting with CHAR_MAX + 1. */
enum
{
PRESUME_INPUT_TTY_OPTION = CHAR_MAX + 1
};
static const struct option longopts[] =
{
/* { name has_arg *flag val } */
{"ascii", 0, 0, 'a'}, /* ascii text mode */
{"to-stdout", 0, 0, 'c'}, /* write output on standard output */
{"stdout", 0, 0, 'c'}, /* write output on standard output */
{"decompress", 0, 0, 'd'}, /* decompress */
{"uncompress", 0, 0, 'd'}, /* decompress */
/* {"encrypt", 0, 0, 'e'}, encrypt */
{"force", 0, 0, 'f'}, /* force overwrite of output file */
{"help", 0, 0, 'h'}, /* give help */
/* {"pkzip", 0, 0, 'k'}, force output in pkzip format */
{"keep", 0, 0, 'k'}, /* keep (don't delete) input files */
{"list", 0, 0, 'l'}, /* list .gz file contents */
{"license", 0, 0, 'L'}, /* display software license */
{"no-name", 0, 0, 'n'}, /* don't save or restore original name & time */
{"name", 0, 0, 'N'}, /* save or restore original name & time */
{"-presume-input-tty", no_argument, NULL, PRESUME_INPUT_TTY_OPTION},
{"quiet", 0, 0, 'q'}, /* quiet mode */
{"silent", 0, 0, 'q'}, /* quiet mode */
{"recursive", 0, 0, 'r'}, /* recurse through directories */
{"suffix", 1, 0, 'S'}, /* use given suffix instead of .gz */
{"test", 0, 0, 't'}, /* test compressed file integrity */
{"no-time", 0, 0, 'T'}, /* don't save or restore the time stamp */
{"verbose", 0, 0, 'v'}, /* verbose mode */
{"version", 0, 0, 'V'}, /* display version number */
{"fast", 0, 0, '1'}, /* compress faster */
{"best", 0, 0, '9'}, /* compress better */
{"lzw", 0, 0, 'Z'}, /* make output compatible with old compress */
{"bits", 1, 0, 'b'}, /* max number of bits per code (implies -Z) */
{ 0, 0, 0, 0 }
};
/* local functions */
local void try_help (void) ATTRIBUTE_NORETURN;
local void help (void);
local void license (void);
local void version (void);
local int input_eof (void);
local void treat_stdin (void);
local void treat_file (char *iname);
local int create_outfile (void);
local char *get_suffix (char *name);
local int open_input_file (char *iname, struct stat *sbuf);
local void discard_input_bytes (size_t nbytes, unsigned int flags);
local int make_ofname (void);
local void shorten_name (char *name);
local int get_method (int in);
local void do_list (int ifd, int method);
local int check_ofname (void);
local void copy_stat (struct stat *ifstat);
local void install_signal_handlers (void);
local void remove_output_file (void);
local RETSIGTYPE abort_gzip_signal (int);
local void do_exit (int exitcode) ATTRIBUTE_NORETURN;
int main (int argc, char **argv);
static int (*work) (int infile, int outfile) = zip; /* function to call */
#if ! NO_DIR
local void treat_dir (int fd, char *dir);
#endif
#define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
static void
try_help ()
{
fprintf (stderr, "Try `%s --help' for more information.\n",
program_name);
do_exit (ERROR);
}
/* ======================================================================== */
local void help()
{
static char const* const help_msg[] = {
"Compress or uncompress FILEs (by default, compress FILES in-place).",
"",
"Mandatory arguments to long options are mandatory for short options too.",
"",
#if O_BINARY
" -a, --ascii ascii text; convert end-of-line using local conventions",
#endif
" -c, --stdout write on standard output, keep original files unchanged",
" -d, --decompress decompress",
/* -e, --encrypt encrypt */
" -f, --force force overwrite of output file and compress links",
" -h, --help give this help",
/* -k, --pkzip force output in pkzip format */
" -k, --keep keep (don't delete) input files",
" -l, --list list compressed file contents",
" -L, --license display software license",
#ifdef UNDOCUMENTED
" -m, --no-time do not save or restore the original modification time",
" -M, --time save or restore the original modification time",
#endif
" -n, --no-name do not save or restore the original name and time stamp",
" -N, --name save or restore the original name and time stamp",
" -q, --quiet suppress all warnings",
#if ! NO_DIR
" -r, --recursive operate recursively on directories",
#endif
" -S, --suffix=SUF use suffix SUF on compressed files",
" -t, --test test compressed file integrity",
" -v, --verbose verbose mode",
" -V, --version display version number",
" -1, --fast compress faster",
" -9, --best compress better",
#ifdef LZW
" -Z, --lzw produce output compatible with old compress",
" -b, --bits=BITS max number of bits per code (implies -Z)",
#endif
"",
"With no FILE, or when FILE is -, read standard input.",
"",
"Report bugs to <bug-gzip@gnu.org>.",
0};
char const *const *p = help_msg;
printf ("Usage: %s [OPTION]... [FILE]...\n", program_name);
while (*p) printf ("%s\n", *p++);
}
/* ======================================================================== */
local void license()
{
char const *const *p = license_msg;
printf ("%s %s\n", program_name, Version);
while (*p) printf ("%s\n", *p++);
}
/* ======================================================================== */
local void version()
{
license ();
printf ("\n");
printf ("Written by Jean-loup Gailly.\n");
}
local void progerror (char const *string)
{
int e = errno;
fprintf (stderr, "%s: ", program_name);
errno = e;
perror(string);
exit_code = ERROR;
}
/* ======================================================================== */
int main (int argc, char **argv)
{
int file_count; /* number of files to process */
size_t proglen; /* length of program_name */
int optc; /* current option */
EXPAND(argc, argv); /* wild card expansion if necessary */
program_name = gzip_base_name (argv[0]);
proglen = strlen (program_name);
atexit (close_stdin);
/* Suppress .exe for MSDOS, OS/2 and VMS: */
if (4 < proglen && strequ (program_name + proglen - 4, ".exe"))
program_name[proglen - 4] = '\0';
/* Add options in GZIP environment variable if there is one */
env = add_envopt(&argc, &argv, OPTIONS_VAR);
if (env != NULL) args = argv;
#ifndef GNU_STANDARD
# define GNU_STANDARD 1
#endif
#if !GNU_STANDARD
/* For compatibility with old compress, use program name as an option.
* Unless you compile with -DGNU_STANDARD=0, this program will behave as
* gzip even if it is invoked under the name gunzip or zcat.
*
* Systems which do not support links can still use -d or -dc.
* Ignore an .exe extension for MSDOS, OS/2 and VMS.
*/
if (strncmp (program_name, "un", 2) == 0 /* ungzip, uncompress */
|| strncmp (program_name, "gun", 3) == 0) /* gunzip */
decompress = 1;
else if (strequ (program_name + 1, "cat") /* zcat, pcat, gcat */
|| strequ (program_name, "gzcat")) /* gzcat */
decompress = to_stdout = 1;
#endif
z_suffix = Z_SUFFIX;
z_len = strlen(z_suffix);
while ((optc = getopt_long (argc, argv, "ab:cdfhH?klLmMnNqrS:tvVZ123456789",
longopts, (int *)0)) != -1) {
switch (optc) {
case 'a':
ascii = 1; break;
case 'b':
maxbits = atoi(optarg);
for (; *optarg; optarg++)
if (! ('0' <= *optarg && *optarg <= '9'))
{
fprintf (stderr, "%s: -b operand is not an integer\n",
program_name);
try_help ();
}
break;
case 'c':
to_stdout = 1; break;
case 'd':
decompress = 1; break;
case 'f':
force++; break;
case 'h': case 'H':
help(); do_exit(OK); break;
case 'k':
keep = 1; break;
case 'l':
list = decompress = to_stdout = 1; break;
case 'L':
license(); do_exit(OK); break;
case 'm': /* undocumented, may change later */
no_time = 1; break;
case 'M': /* undocumented, may change later */
no_time = 0; break;
case 'n':
no_name = no_time = 1; break;
case 'N':
no_name = no_time = 0; break;
case PRESUME_INPUT_TTY_OPTION:
presume_input_tty = true; break;
case 'q':
quiet = 1; verbose = 0; break;
case 'r':
#if NO_DIR
fprintf (stderr, "%s: -r not supported on this system\n",
program_name);
try_help ();
#else
recursive = 1;
#endif
break;
case 'S':
#ifdef NO_MULTIPLE_DOTS
if (*optarg == '.') optarg++;
#endif
z_len = strlen(optarg);
z_suffix = optarg;
break;
case 't':
test = decompress = to_stdout = 1;
break;
case 'v':
verbose++; quiet = 0; break;
case 'V':
version(); do_exit(OK); break;
case 'Z':
#ifdef LZW
do_lzw = 1; break;
#else
fprintf(stderr, "%s: -Z not supported in this version\n",
program_name);
try_help ();
break;
#endif
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
level = optc - '0';
break;
default:
/* Error message already emitted by getopt_long. */
try_help ();
}
} /* loop on all arguments */
/* By default, save name and timestamp on compression but do not
* restore them on decompression.
*/
if (no_time < 0) no_time = decompress;
if (no_name < 0) no_name = decompress;
file_count = argc - optind;
#if O_BINARY
#else
if (ascii && !quiet) {
fprintf(stderr, "%s: option --ascii ignored on this system\n",
program_name);
}
#endif
if (z_len == 0 || z_len > MAX_SUFFIX) {
fprintf(stderr, "%s: invalid suffix '%s'\n", program_name, z_suffix);
do_exit(ERROR);
}
if (do_lzw && !decompress) work = lzw;
/* Allocate all global buffers (for DYN_ALLOC option) */
ALLOC(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
ALLOC(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
ALLOC(ush, d_buf, DIST_BUFSIZE);
ALLOC(uch, window, 2L*WSIZE);
#ifndef MAXSEG_64K
ALLOC(ush, tab_prefix, 1L<<BITS);
#else
ALLOC(ush, tab_prefix0, 1L<<(BITS-1));
ALLOC(ush, tab_prefix1, 1L<<(BITS-1));
#endif
exiting_signal = quiet ? SIGPIPE : 0;
install_signal_handlers ();
/* And get to work */
if (file_count != 0) {
if (to_stdout && !test && !list && (!decompress || !ascii)) {
SET_BINARY_MODE(fileno(stdout));
}
while (optind < argc) {
treat_file(argv[optind++]);
}
} else { /* Standard input */
treat_stdin();
}
if (list && !quiet && file_count > 1) {
do_list(-1, -1); /* print totals */
}
do_exit(exit_code);
return exit_code; /* just to avoid lint warning */
}
/* Return nonzero when at end of file on input. */
local int
input_eof ()
{
if (!decompress || last_member)
return 1;
if (inptr == insize)
{
if (insize != INBUFSIZ || fill_inbuf (1) == EOF)
return 1;
/* Unget the char that fill_inbuf got. */
inptr = 0;
}
return 0;
}
/* ========================================================================
* Compress or decompress stdin
*/
local void treat_stdin()
{
if (!force && !list
&& (presume_input_tty
|| isatty(fileno((FILE *)(decompress ? stdin : stdout))))) {
/* Do not send compressed data to the terminal or read it from
* the terminal. We get here when user invoked the program
* without parameters, so be helpful. According to the GNU standards:
*
* If there is one behavior you think is most useful when the output
* is to a terminal, and another that you think is most useful when
* the output is a file or a pipe, then it is usually best to make
* the default behavior the one that is useful with output to a
* terminal, and have an option for the other behavior.
*
* Here we use the --force option to get the other behavior.
*/
if (! quiet)
fprintf (stderr,
("%s: compressed data not %s a terminal."
" Use -f to force %scompression.\n"
"For help, type: %s -h\n"),
program_name,
decompress ? "read from" : "written to",
decompress ? "de" : "",
program_name);
do_exit(ERROR);
}
if (decompress || !ascii) {
SET_BINARY_MODE(fileno(stdin));
}
if (!test && !list && (!decompress || !ascii)) {
SET_BINARY_MODE(fileno(stdout));
}
strcpy(ifname, "stdin");
strcpy(ofname, "stdout");
/* Get the file's time stamp and size. */
if (fstat (fileno (stdin), &istat) != 0)
{
progerror ("standard input");
do_exit (ERROR);
}
ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1;
time_stamp.tv_nsec = -1;
if (!no_time || list)
{
if (S_ISREG (istat.st_mode))
time_stamp = get_stat_mtime (&istat);
else
gettime (&time_stamp);
}
clear_bufs(); /* clear input and output buffers */
to_stdout = 1;
part_nb = 0;
ifd = fileno(stdin);
if (decompress) {
method = get_method(ifd);
if (method < 0) {
do_exit(exit_code); /* error message already emitted */
}
}
if (list) {
do_list(ifd, method);
return;
}
/* Actually do the compression/decompression. Loop over zipped members.
*/
for (;;) {
if ((*work)(fileno(stdin), fileno(stdout)) != OK) return;
if (input_eof ())
break;
method = get_method(ifd);
if (method < 0) return; /* error message already emitted */
bytes_out = 0; /* required for length check */
}
if (verbose) {
if (test) {
fprintf(stderr, " OK\n");
} else if (!decompress) {
display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
fprintf(stderr, "\n");
#ifdef DISPLAY_STDIN_RATIO
} else {
display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
fprintf(stderr, "\n");
#endif
}
}
}
/* ========================================================================
* Compress or decompress the given file
*/
local void treat_file(iname)
char *iname;
{
/* Accept "-" as synonym for stdin */
if (strequ(iname, "-")) {
int cflag = to_stdout;
treat_stdin();
to_stdout = cflag;
return;
}
/* Check if the input file is present, set ifname and istat: */
ifd = open_input_file (iname, &istat);
if (ifd < 0)
return;
/* If the input name is that of a directory, recurse or ignore: */
if (S_ISDIR(istat.st_mode)) {
#if ! NO_DIR
if (recursive) {
treat_dir (ifd, iname);
/* Warning: ifname is now garbage */
return;
}
#endif
close (ifd);
WARN ((stderr, "%s: %s is a directory -- ignored\n",
program_name, ifname));
return;
}
if (! to_stdout)
{
if (! S_ISREG (istat.st_mode))
{
WARN ((stderr,
"%s: %s is not a directory or a regular file - ignored\n",
program_name, ifname));
close (ifd);
return;
}
if (istat.st_mode & S_ISUID)
{
WARN ((stderr, "%s: %s is set-user-ID on execution - ignored\n",
program_name, ifname));
close (ifd);
return;
}
if (istat.st_mode & S_ISGID)
{
WARN ((stderr, "%s: %s is set-group-ID on execution - ignored\n",
program_name, ifname));
close (ifd);
return;
}
if (! force)
{
if (istat.st_mode & S_ISVTX)
{
WARN ((stderr,
"%s: %s has the sticky bit set - file ignored\n",
program_name, ifname));
close (ifd);
return;
}
if (2 <= istat.st_nlink)
{
WARN ((stderr, "%s: %s has %lu other link%c -- unchanged\n",
program_name, ifname,
(unsigned long int) istat.st_nlink - 1,
istat.st_nlink == 2 ? ' ' : 's'));
close (ifd);
return;
}
}
}
ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1;
time_stamp.tv_nsec = -1;
if (!no_time || list)
time_stamp = get_stat_mtime (&istat);
/* Generate output file name. For -r and (-t or -l), skip files
* without a valid gzip suffix (check done in make_ofname).
*/
if (to_stdout && !list && !test) {
strcpy(ofname, "stdout");
} else if (make_ofname() != OK) {
close (ifd);
return;
}
clear_bufs(); /* clear input and output buffers */
part_nb = 0;
if (decompress) {
method = get_method(ifd); /* updates ofname if original given */
if (method < 0) {
close(ifd);
return; /* error message already emitted */
}
}
if (list) {
do_list(ifd, method);
if (close (ifd) != 0)
read_error ();
return;
}
/* If compressing to a file, check if ofname is not ambiguous
* because the operating system truncates names. Otherwise, generate
* a new ofname and save the original name in the compressed file.
*/
if (to_stdout) {
ofd = fileno(stdout);
/* Keep remove_ofname_fd negative. */
} else {
if (create_outfile() != OK) return;
if (!decompress && save_orig_name && !verbose && !quiet) {
fprintf(stderr, "%s: %s compressed to %s\n",
program_name, ifname, ofname);
}
}
/* Keep the name even if not truncated except with --no-name: */
if (!save_orig_name) save_orig_name = !no_name;
if (verbose) {
fprintf(stderr, "%s:\t", ifname);
}
/* Actually do the compression/decompression. Loop over zipped members.
*/
for (;;) {
if ((*work)(ifd, ofd) != OK) {
method = -1; /* force cleanup */
break;
}
if (input_eof ())
break;
method = get_method(ifd);
if (method < 0) break; /* error message already emitted */
bytes_out = 0; /* required for length check */
}
if (close (ifd) != 0)
read_error ();
if (!to_stdout)
{
copy_stat (&istat);
if (close (ofd) != 0)
write_error ();
if (!keep)
{
sigset_t oldset;
int unlink_errno;
sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
remove_ofname_fd = -1;
unlink_errno = xunlink (ifname) == 0 ? 0 : errno;
sigprocmask (SIG_SETMASK, &oldset, NULL);
if (unlink_errno)
{
WARN ((stderr, "%s: ", program_name));
if (!quiet)
{
errno = unlink_errno;
perror (ifname);
}
}
}
}
if (method == -1) {
if (!to_stdout)
remove_output_file ();
return;
}
/* Display statistics */
if(verbose) {
if (test) {
fprintf(stderr, " OK");
} else if (decompress) {
display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
} else {
display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
}
if (!test && !to_stdout) {
fprintf(stderr, " -- replaced with %s", ofname);
}
fprintf(stderr, "\n");
}
}
/* ========================================================================
* Create the output file. Return OK or ERROR.
* Try several times if necessary to avoid truncating the z_suffix. For
* example, do not create a compressed file of name "1234567890123."
* Sets save_orig_name to true if the file name has been truncated.
* IN assertions: the input file has already been open (ifd is set) and
* ofname has already been updated if there was an original name.
* OUT assertions: ifd and ofd are closed in case of error.
*/
local int create_outfile()
{
int name_shortened = 0;
int flags = (O_WRONLY | O_CREAT | O_EXCL
| (ascii && decompress ? 0 : O_BINARY));
for (;;)
{
int open_errno;
sigset_t oldset;
sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
remove_ofname_fd = ofd = OPEN (ofname, flags, RW_USER);
open_errno = errno;
sigprocmask (SIG_SETMASK, &oldset, NULL);
if (0 <= ofd)
break;
switch (open_errno)
{
#ifdef ENAMETOOLONG
case ENAMETOOLONG:
shorten_name (ofname);
name_shortened = 1;
break;
#endif
case EEXIST:
if (check_ofname () != OK)
{
close (ifd);
return ERROR;
}
break;
default:
progerror (ofname);
close (ifd);
return ERROR;
}
}
if (name_shortened && decompress)
{
/* name might be too long if an original name was saved */
WARN ((stderr, "%s: %s: warning, name truncated\n",
program_name, ofname));
}
return OK;
}
/* ========================================================================
* Return a pointer to the 'z' suffix of a file name, or NULL. For all
* systems, ".gz", ".z", ".Z", ".taz", ".tgz", "-gz", "-z" and "_z" are
* accepted suffixes, in addition to the value of the --suffix option.
* ".tgz" is a useful convention for tar.z files on systems limited
* to 3 characters extensions. On such systems, ".?z" and ".??z" are
* also accepted suffixes. For Unix, we do not want to accept any
* .??z suffix as indicating a compressed file; some people use .xyz
* to denote volume data.
* On systems allowing multiple versions of the same file (such as VMS),
* this function removes any version suffix in the given name.
*/
local char *get_suffix(name)
char *name;
{
int nlen, slen;
char suffix[MAX_SUFFIX+3]; /* last chars of name, forced to lower case */
static char const *known_suffixes[] =
{NULL, ".gz", ".z", ".taz", ".tgz", "-gz", "-z", "_z",
#ifdef MAX_EXT_CHARS
"z",
#endif
NULL};
char const **suf = known_suffixes;
*suf = z_suffix;
if (strequ(z_suffix, "z")) suf++; /* check long suffixes first */
#ifdef SUFFIX_SEP
/* strip a version number from the file name */
{