mirror of
https://https.git.savannah.gnu.org/git/gzip.git
synced 2026-01-26 07:37:53 +00:00
c8e167e3e8
* gunzip.in, gzexe.in, gzip.c, zcat.in, zcmp.in, zdiff.in, zforce.in, zgrep.in, zless.in, zmore.in, znew.in: Also update the --version copyright dates (while updated by update-copyright, those didn't satisfy syntax-check) by running this: grep -l 2025-2026 *.in gzip.c|xargs perl -pi -e 's/2025-2026/2026/'
2083 lines
63 KiB
C
2083 lines
63 KiB
C
/* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
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Copyright (C) 1999, 2001-2002, 2006-2007, 2009-2026 Free Software
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Foundation, Inc.
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Copyright (C) 1992-1993 Jean-loup Gailly
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/*
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* The unzip code was written and put in the public domain by Mark Adler.
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* Portions of the lzw code are derived from the public domain 'compress'
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* written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
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* Ken Turkowski, Dave Mack and Peter Jannesen.
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*
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* See the license_msg below and the file COPYING for the software license.
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* See the file algorithm.doc for the compression algorithms and file formats.
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*/
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static char const *const license_msg[] = {
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"Copyright (C) 2026 Free Software Foundation, Inc.",
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"Copyright (C) 1993 Jean-loup Gailly.",
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"This is free software. You may redistribute copies of it under the terms of",
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"the GNU General Public License <https://www.gnu.org/licenses/gpl.html>.",
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"There is NO WARRANTY, to the extent permitted by law.",
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0};
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/* Compress files with zip algorithm and 'compress' interface.
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* See help() function below for all options.
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* Outputs:
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* file.gz: compressed file with same mode, owner, and utimes
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* or stdout with -c option or if stdin used as input.
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* If the output file name had to be truncated, the original name is kept
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* in the compressed file.
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* On MSDOS, file.tmp -> file.tmz.
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*
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* Using gz on MSDOS would create too many file name conflicts. For
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* example, foo.txt -> foo.tgz (.tgz must be reserved as shorthand for
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* tar.gz). Similarly, foo.dir and foo.doc would both be mapped to foo.dgz.
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* I also considered 12345678.txt -> 12345txt.gz but this truncates the name
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* too heavily. There is no ideal solution given the MSDOS 8+3 limitation.
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*
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* For the meaning of all compilation flags, see comments in Makefile.in.
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*/
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#include <config.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <stddef.h>
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#include <sys/stat.h>
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#include <getopt.h>
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#include <errno.h>
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#include "tailor.h"
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#include "gzip.h"
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#include "intprops.h"
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#include "lzw.h"
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#include "revision.h"
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#include "timespec.h"
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#include "dirname.h"
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#include "fcntl--.h"
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#include "filename.h"
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#include "ignore-value.h"
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#include "stat-time.h"
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#include "version.h"
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#include "xalloc.h"
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#include "yesno.h"
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/* configuration */
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#include <limits.h>
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#include <inttypes.h>
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#include <unistd.h>
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#include <stdlib.h>
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#ifndef NO_DIR
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# define NO_DIR 0
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#endif
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#if !NO_DIR
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# include <dirent.h>
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# include <savedir.h>
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#endif
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#ifndef NO_UTIME
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# include <utimens.h>
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#endif
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#ifndef MAX_PATH_LEN
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# define MAX_PATH_LEN 1024 /* max pathname length */
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#endif
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#ifndef SEEK_END
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# define SEEK_END 2
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#endif
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#ifdef off_t
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off_t lseek (int fd, off_t offset, int whence);
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#endif
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#ifndef HAVE_WORKING_O_NOFOLLOW
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# define HAVE_WORKING_O_NOFOLLOW 0
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#endif
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/* Separator for file name parts (see shorten_name()) */
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#ifdef NO_MULTIPLE_DOTS
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# define PART_SEP "-"
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#else
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# define PART_SEP "."
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#endif
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/* global buffers */
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/* With IBM_Z_DFLTCC, DEFLATE COMPRESSION works faster with
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page-aligned input and output buffers, and requires page-aligned
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windows; the alignment requirement is 4096. On other platforms
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alignment doesn't hurt, and alignment up to 4096 is portable so
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let's do that. */
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#if defined HAVE_C_ALIGNASOF || defined alignas
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# define BUFFER_ALIGNED alignas (4096)
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#else
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# define BUFFER_ALIGNED /**/
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#endif
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DECLARE(uch BUFFER_ALIGNED, inbuf, INBUFSIZ +INBUF_EXTRA);
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DECLARE(uch BUFFER_ALIGNED, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
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DECLARE(ush, d_buf, DIST_BUFSIZE);
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DECLARE(uch BUFFER_ALIGNED, window, 2L*WSIZE);
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#ifndef MAXSEG_64K
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DECLARE(ush, tab_prefix, 1L<<BITS);
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#else
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DECLARE(ush, tab_prefix0, 1L<<(BITS-1));
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DECLARE(ush, tab_prefix1, 1L<<(BITS-1));
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#endif
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/* local variables */
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/* If true, pretend that standard input is a tty. This option
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is deliberately not documented, and only for testing. */
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static bool presume_input_tty;
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/* If true, transfer output data to the output file's storage device
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when supported. Otherwise, if the system crashes around the time
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gzip is run, the user might lose both input and output data. See:
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Pillai TS et al. All file systems are not created equal: on the
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complexity of crafting crash-consistent applications. OSDI'14. 2014:433-48.
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https://www.usenix.org/conference/osdi14/technical-sessions/presentation/pillai */
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static bool synchronous;
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static int ascii = 0; /* convert end-of-lines to local OS conventions */
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int to_stdout = 0; /* output to stdout (-c) */
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static int decompress = 0; /* decompress (-d) */
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static int force = 0; /* don't ask questions, compress links (-f) */
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static int keep = 0; /* keep (don't delete) input files */
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static int no_name = -1; /* don't save or restore the original file name */
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static int no_time = -1; /* don't save or restore the original file time */
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static int recursive = 0; /* recurse through directories (-r) */
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static int list = 0; /* list the file contents (-l) */
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#ifndef DEBUG
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static
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#endif
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int verbose = 0; /* be verbose (-v) */
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int quiet = 0; /* be very quiet (-q) */
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int test = 0; /* test .gz file integrity */
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static int foreground = 0; /* set if program run in foreground */
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char *program_name; /* program name */
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int maxbits = BITS; /* max bits per code for LZW */
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int method = DEFLATED;/* compression method */
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int level = 6; /* compression level */
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int exit_code = OK; /* program exit code */
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int save_orig_name; /* set if original name must be saved */
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static int last_member; /* set for .zip and .Z files */
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static int part_nb; /* number of parts in .gz file */
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off_t ifile_size; /* input file size, -1 for devices (debug only) */
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static char *env; /* contents of GZIP env variable */
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static char const *z_suffix; /* default suffix (can be set with --suffix) */
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static size_t z_len; /* strlen(z_suffix) */
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/* The original timestamp (modification time). If the original is
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unknown, TIME_STAMP.tv_nsec is negative. If the original is
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greater than struct timespec range, TIME_STAMP is the maximal
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struct timespec value; this can happen on hosts with 32-bit signed
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time_t because the gzip format's MTIME is 32-bit unsigned.
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The original cannot be less than struct timespec range. */
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struct timespec time_stamp;
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/* The set of signals that are caught. */
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static sigset_t caught_signals;
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/* If nonnegative, close this file descriptor and unlink remove_ofname
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on error. */
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static int volatile remove_ofname_fd = -1;
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static char volatile remove_ofname[MAX_PATH_LEN];
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static bool stdin_was_read;
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off_t bytes_in; /* number of input bytes */
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off_t bytes_out; /* number of output bytes */
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static off_t total_in; /* input bytes for all files */
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static off_t total_out; /* Output bytes for all files. */
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char ifname[MAX_PATH_LEN]; /* input file name */
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char ofname[MAX_PATH_LEN]; /* output file name */
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static char dfname[MAX_PATH_LEN]; /* name of dir containing output file */
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static struct stat istat; /* status for input file */
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int ifd; /* input file descriptor */
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int ofd; /* output file descriptor */
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static int dfd = -1; /* output directory file descriptor */
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unsigned insize; /* valid bytes in inbuf */
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unsigned inptr; /* index of next byte to be processed in inbuf */
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unsigned outcnt; /* bytes in output buffer */
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int rsync = 0; /* make rsyncable chunks */
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static int handled_sig[] =
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{
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/* SIGINT must be first, as 'foreground' depends on it. */
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SIGINT
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#ifdef SIGHUP
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, SIGHUP
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#endif
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#if SIGPIPE
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, SIGPIPE
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#endif
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#ifdef SIGTERM
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, SIGTERM
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#endif
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#ifdef SIGXCPU
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, SIGXCPU
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#endif
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#ifdef SIGXFSZ
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, SIGXFSZ
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#endif
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};
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/* For long options that have no equivalent short option, use a
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non-character as a pseudo short option, starting with CHAR_MAX + 1. */
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enum
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{
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PRESUME_INPUT_TTY_OPTION = CHAR_MAX + 1,
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RSYNCABLE_OPTION,
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SYNCHRONOUS_OPTION,
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};
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static char const shortopts[] = "ab:cdfhH?klLmMnNqrS:tvVZ123456789";
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static const struct option longopts[] =
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{
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/* { name has_arg *flag val } */
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{"ascii", 0, 0, 'a'}, /* ascii text mode */
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{"to-stdout", 0, 0, 'c'}, /* write output on standard output */
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{"stdout", 0, 0, 'c'}, /* write output on standard output */
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{"decompress", 0, 0, 'd'}, /* decompress */
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{"uncompress", 0, 0, 'd'}, /* decompress */
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/* {"encrypt", 0, 0, 'e'}, encrypt */
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{"force", 0, 0, 'f'}, /* force overwrite of output file */
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{"help", 0, 0, 'h'}, /* give help */
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/* {"pkzip", 0, 0, 'k'}, force output in pkzip format */
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{"keep", 0, 0, 'k'}, /* keep (don't delete) input files */
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{"list", 0, 0, 'l'}, /* list .gz file contents */
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{"license", 0, 0, 'L'}, /* display software license */
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{"no-name", 0, 0, 'n'}, /* don't save or restore original name & time */
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{"name", 0, 0, 'N'}, /* save or restore original name & time */
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{"-presume-input-tty", no_argument, NULL, PRESUME_INPUT_TTY_OPTION},
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{"quiet", 0, 0, 'q'}, /* quiet mode */
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{"silent", 0, 0, 'q'}, /* quiet mode */
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{"synchronous",0, 0, SYNCHRONOUS_OPTION}, /* output data synchronously */
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{"recursive", 0, 0, 'r'}, /* recurse through directories */
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{"suffix", 1, 0, 'S'}, /* use given suffix instead of .gz */
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{"test", 0, 0, 't'}, /* test compressed file integrity */
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{"verbose", 0, 0, 'v'}, /* verbose mode */
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{"version", 0, 0, 'V'}, /* display version number */
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{"fast", 0, 0, '1'}, /* compress faster */
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{"best", 0, 0, '9'}, /* compress better */
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{"lzw", 0, 0, 'Z'}, /* make output compatible with old compress */
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{"bits", 1, 0, 'b'}, /* max number of bits per code (implies -Z) */
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{"rsyncable", 0, 0, RSYNCABLE_OPTION}, /* make rsync-friendly archive */
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{ 0, 0, 0, 0 }
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};
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/* local functions */
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_Noreturn static void try_help (void);
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static void help (void);
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static void license (void);
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static void version (void);
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static int input_eof (void);
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static void treat_stdin (void);
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static void treat_file (char *iname);
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static int create_outfile (void);
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static char *get_suffix (char *name);
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static int open_input_file (char *iname, struct stat *sbuf);
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static void discard_input_bytes (size_t nbytes, unsigned int flags);
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static int make_ofname (void);
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static void shorten_name (char *name);
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static int get_method (int in, bool first);
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static void do_list (int method);
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static int check_ofname (void);
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static void copy_stat (struct stat *ifstat);
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static void install_signal_handlers (void);
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static void remove_output_file (bool);
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static void abort_gzip_signal (int);
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_Noreturn static void do_exit (int exitcode);
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static void finish_out (void);
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int main (int argc, char **argv);
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static int (*work) (int infile, int outfile) = zip; /* function to call */
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#if ! NO_DIR
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static void treat_dir (int fd, char *dir);
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#endif
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#define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
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static void
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try_help ()
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{
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fprintf (stderr, "Try `%s --help' for more information.\n",
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program_name);
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do_exit (ERROR);
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}
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/* ======================================================================== */
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static void
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help ()
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{
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static char const* const help_msg[] = {
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"Compress or uncompress FILEs (by default, compress FILES in-place).",
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"",
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"Mandatory arguments to long options are mandatory for short options too.",
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"",
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#if O_BINARY
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" -a, --ascii ascii text; convert end-of-line using local conventions",
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#endif
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" -c, --stdout write on standard output, keep original files unchanged",
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" -d, --decompress decompress",
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/* -e, --encrypt encrypt */
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" -f, --force force overwrite of output file and compress links",
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" -h, --help give this help",
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/* -k, --pkzip force output in pkzip format */
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" -k, --keep keep (don't delete) input files",
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" -l, --list list compressed file contents",
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" -L, --license display software license",
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#ifdef UNDOCUMENTED
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" -m do not save or restore the original modification time",
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" -M, --time save or restore the original modification time",
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#endif
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" -n, --no-name do not save or restore the original name and timestamp",
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" -N, --name save or restore the original name and timestamp",
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" -q, --quiet suppress all warnings",
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#if ! NO_DIR
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" -r, --recursive operate recursively on directories",
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#endif
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" --rsyncable make rsync-friendly archive",
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" -S, --suffix=SUF use suffix SUF on compressed files",
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" --synchronous synchronous output (safer if system crashes, but slower)",
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" -t, --test test compressed file integrity",
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" -v, --verbose verbose mode",
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" -V, --version display version number",
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" -1, --fast compress faster",
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" -9, --best compress better",
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"",
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"With no FILE, or when FILE is -, read standard input.",
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"",
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"Report bugs to <bug-gzip@gnu.org>.",
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0};
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char const *const *p = help_msg;
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printf ("Usage: %s [OPTION]... [FILE]...\n", program_name);
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while (*p) printf ("%s\n", *p++);
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}
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/* ======================================================================== */
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static void
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license ()
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{
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char const *const *p = license_msg;
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printf ("%s %s\n", program_name, Version);
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while (*p) printf ("%s\n", *p++);
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}
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/* ======================================================================== */
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static void
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version ()
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{
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license ();
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printf ("\n");
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printf ("Written by Jean-loup Gailly.\n");
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}
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static void
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progerror (char const *string)
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{
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fprintf (stderr, "%s: %s: %s\n", program_name, string, strerror (errno));
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exit_code = ERROR;
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}
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/* ======================================================================== */
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int main (int argc, char **argv)
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{
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int file_count; /* number of files to process */
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size_t proglen; /* length of program_name */
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char **argv_copy;
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int env_argc;
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char **env_argv;
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EXPAND(argc, argv); /* wild card expansion if necessary */
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program_name = gzip_base_name (argv[0]);
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proglen = strlen (program_name);
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/* Suppress .exe for MSDOS and OS/2: */
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if (4 < proglen && strequ (program_name + proglen - 4, ".exe"))
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program_name[proglen - 4] = '\0';
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|
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/* Add options in GZIP environment variable if there is one */
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argv_copy = argv;
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env = add_envopt (&env_argc, &argv_copy, OPTIONS_VAR);
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env_argv = env ? argv_copy : NULL;
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opterr = !env;
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|
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#ifndef GNU_STANDARD
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# define GNU_STANDARD 1
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#endif
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#if !GNU_STANDARD
|
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/* For compatibility with old compress, use program name as an option.
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|
* Unless you compile with -DGNU_STANDARD=0, this program will behave as
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* gzip even if it is invoked under the name gunzip or zcat.
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|
*
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* Systems which do not support links can still use -d or -dc.
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|
* Ignore an .exe extension for MSDOS and OS/2.
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*/
|
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if (strncmp (program_name, "un", 2) == 0 /* ungzip, uncompress */
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|| strncmp (program_name, "gun", 3) == 0) /* gunzip */
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decompress = 1;
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else if (strequ (program_name + 1, "cat") /* zcat, pcat, gcat */
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|| strequ (program_name, "gzcat")) /* gzcat */
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decompress = to_stdout = 1;
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#endif
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z_suffix = Z_SUFFIX;
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z_len = strlen(z_suffix);
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|
|
while (true) {
|
|
int optc;
|
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|
|
if (env_argv)
|
|
{
|
|
/* Get the next option taken from the GZIP environment variable
|
|
that affects only performance (including compression level).
|
|
Silently ignore other options, non-options, invalid options,
|
|
and option syntax errors, so that bad GZIP values do
|
|
not unduly interfere with normal gzip operation. */
|
|
do
|
|
{
|
|
optc = getopt_long (env_argc, env_argv, shortopts, longopts,
|
|
NULL);
|
|
if (optc < 0)
|
|
{
|
|
/* Start processing ARGC and ARGV instead. */
|
|
free (env_argv);
|
|
env_argv = NULL;
|
|
opterr = 1;
|
|
optind = 1;
|
|
break;
|
|
}
|
|
}
|
|
while (! (('1' <= optc && optc <= '9')
|
|
|| optc == RSYNCABLE_OPTION
|
|
|| optc == SYNCHRONOUS_OPTION));
|
|
}
|
|
|
|
if (!env_argv)
|
|
optc = getopt_long (argc, argv, shortopts, longopts, NULL);
|
|
if (optc < 0)
|
|
break;
|
|
|
|
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 (); finish_out (); break;
|
|
case 'k':
|
|
keep = 1; break;
|
|
case 'l':
|
|
list = decompress = test = to_stdout = 1; break;
|
|
case 'L':
|
|
license (); finish_out (); 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 RSYNCABLE_OPTION:
|
|
rsync = 1;
|
|
break;
|
|
case 'S':
|
|
#ifdef NO_MULTIPLE_DOTS
|
|
if (*optarg == '.') optarg++;
|
|
#endif
|
|
for (z_len = 0; optarg[z_len]; z_len++)
|
|
if (optarg[z_len] == '/')
|
|
{
|
|
fprintf (stderr, "%s: suffix contains '/'\n", program_name);
|
|
do_exit (ERROR);
|
|
}
|
|
z_suffix = optarg;
|
|
break;
|
|
case SYNCHRONOUS_OPTION:
|
|
synchronous = true;
|
|
break;
|
|
case 't':
|
|
test = decompress = to_stdout = 1;
|
|
break;
|
|
case 'v':
|
|
verbose++; quiet = 0; break;
|
|
case 'V':
|
|
version (); finish_out (); break;
|
|
case 'Z':
|
|
fprintf(stderr, "%s: -Z not supported in this version\n",
|
|
program_name);
|
|
try_help ();
|
|
break;
|
|
case '1': case '2': case '3': case '4':
|
|
case '5': case '6': case '7': case '8': case '9':
|
|
level = optc - '0';
|
|
break;
|
|
|
|
default:
|
|
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);
|
|
}
|
|
|
|
/* 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
|
|
|
|
/* And get to work */
|
|
if (file_count != 0) {
|
|
if (to_stdout && !test && (!decompress || !ascii)) {
|
|
SET_BINARY_MODE (STDOUT_FILENO);
|
|
}
|
|
while (optind < argc) {
|
|
treat_file(argv[optind++]);
|
|
}
|
|
} else { /* Standard input */
|
|
treat_stdin();
|
|
}
|
|
if (stdin_was_read && close (STDIN_FILENO) != 0)
|
|
{
|
|
strcpy (ifname, "stdin");
|
|
read_error ();
|
|
}
|
|
if (list)
|
|
{
|
|
/* Output any totals, and check for output errors. */
|
|
if (!quiet && 1 < file_count)
|
|
do_list (-1);
|
|
if (fflush (stdout) != 0)
|
|
write_error ();
|
|
}
|
|
if (to_stdout
|
|
&& ((synchronous
|
|
&& fdatasync (STDOUT_FILENO) != 0 && errno != EINVAL)
|
|
|| close (STDOUT_FILENO) != 0)
|
|
&& errno != EBADF)
|
|
write_error ();
|
|
do_exit(exit_code);
|
|
}
|
|
|
|
/* Return nonzero when at end of file on input. */
|
|
static 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;
|
|
}
|
|
|
|
static void
|
|
get_input_size_and_time (void)
|
|
{
|
|
ifile_size = -1;
|
|
time_stamp.tv_nsec = -1;
|
|
|
|
/* Record the input file's size and timestamp only if it is a
|
|
regular file. Doing this for the timestamp helps to keep gzip's
|
|
output more reproducible when it is used as part of a
|
|
pipeline. */
|
|
|
|
if (S_ISREG (istat.st_mode))
|
|
{
|
|
ifile_size = istat.st_size;
|
|
if (!no_time || list)
|
|
time_stamp = get_stat_mtime (&istat);
|
|
}
|
|
}
|
|
|
|
/* ========================================================================
|
|
* Compress or decompress stdin
|
|
*/
|
|
static void
|
|
treat_stdin ()
|
|
{
|
|
if (!force && !list
|
|
&& (presume_input_tty
|
|
|| isatty (decompress ? STDIN_FILENO : STDOUT_FILENO))) {
|
|
/* 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 (STDIN_FILENO);
|
|
}
|
|
if (!test && (!decompress || !ascii)) {
|
|
SET_BINARY_MODE (STDOUT_FILENO);
|
|
}
|
|
strcpy(ifname, "stdin");
|
|
strcpy(ofname, "stdout");
|
|
|
|
/* Get the file's timestamp and size. */
|
|
if (fstat (STDIN_FILENO, &istat) != 0)
|
|
{
|
|
progerror ("standard input");
|
|
do_exit (ERROR);
|
|
}
|
|
|
|
get_input_size_and_time ();
|
|
|
|
clear_bufs(); /* clear input and output buffers */
|
|
to_stdout = 1;
|
|
part_nb = 0;
|
|
ifd = STDIN_FILENO;
|
|
stdin_was_read = true;
|
|
|
|
if (decompress) {
|
|
method = get_method (ifd, true);
|
|
if (method < 0) {
|
|
do_exit(exit_code); /* error message already emitted */
|
|
}
|
|
}
|
|
|
|
/* Actually do the compression/decompression. Loop over zipped members.
|
|
*/
|
|
for (;;) {
|
|
if (work (STDIN_FILENO, STDOUT_FILENO) != OK)
|
|
return;
|
|
|
|
if (input_eof ())
|
|
break;
|
|
|
|
method = get_method (ifd, false);
|
|
if (method < 0) return; /* error message already emitted */
|
|
}
|
|
|
|
if (list)
|
|
{
|
|
do_list (method);
|
|
return;
|
|
}
|
|
|
|
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
|
|
}
|
|
}
|
|
}
|
|
|
|
static char const dot = '.';
|
|
|
|
/* True if the cached directory for calls to openat etc. is DIR, with
|
|
length DIRLEN. DIR need not be null-terminated. DIRLEN must be
|
|
less than MAX_PATH_LEN. */
|
|
static bool
|
|
atdir_eq (char const *dir, ptrdiff_t dirlen)
|
|
{
|
|
if (dirlen == 0)
|
|
dir = &dot, dirlen = 1;
|
|
return memcmp (dfname, dir, dirlen) == 0 && !dfname[dirlen];
|
|
}
|
|
|
|
/* Set the directory used for calls to openat etc. to be the directory
|
|
DIR, with length DIRLEN. DIR need not be null-terminated.
|
|
DIRLEN must be less than MAX_PATH_LEN. Return a file descriptor for
|
|
the directory, or -1 if one could not be obtained. */
|
|
static int
|
|
atdir_set (char const *dir, ptrdiff_t dirlen)
|
|
{
|
|
/* Don't bother opening directories on older systems that
|
|
lack openat and unlinkat. It's not worth the porting hassle. */
|
|
#if HAVE_OPENAT && HAVE_UNLINKAT
|
|
enum { try_opening_directories = true };
|
|
#else
|
|
enum { try_opening_directories = false };
|
|
#endif
|
|
|
|
if (try_opening_directories && ! atdir_eq (dir, dirlen))
|
|
{
|
|
if (0 <= dfd)
|
|
close (dfd);
|
|
if (dirlen == 0)
|
|
dir = &dot, dirlen = 1;
|
|
memcpy (dfname, dir, dirlen);
|
|
dfname[dirlen] = '\0';
|
|
dfd = open (dfname, O_SEARCH | O_DIRECTORY);
|
|
}
|
|
|
|
return dfd;
|
|
}
|
|
|
|
/* ========================================================================
|
|
* Compress or decompress the given file
|
|
*/
|
|
static void
|
|
treat_file (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%s -- file ignored\n",
|
|
program_name, ifname,
|
|
(unsigned long int) istat.st_nlink - 1,
|
|
istat.st_nlink == 2 ? "" : "s"));
|
|
close (ifd);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
get_input_size_and_time ();
|
|
|
|
/* 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 && !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, true); /* Update ofname if original given. */
|
|
if (method < 0) {
|
|
close(ifd);
|
|
return; /* error message already emitted */
|
|
}
|
|
}
|
|
|
|
/* 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 = STDOUT_FILENO;
|
|
/* 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 && !list) {
|
|
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, false);
|
|
if (method < 0) break; /* error message already emitted */
|
|
}
|
|
|
|
if (close (ifd) != 0)
|
|
read_error ();
|
|
|
|
if (list)
|
|
{
|
|
do_list (method);
|
|
return;
|
|
}
|
|
|
|
if (!to_stdout)
|
|
{
|
|
copy_stat (&istat);
|
|
|
|
if ((synchronous
|
|
&& ((0 <= dfd && fdatasync (dfd) != 0 && errno != EINVAL)
|
|
|| (fsync (ofd) != 0 && errno != EINVAL)))
|
|
|| close (ofd) != 0)
|
|
write_error ();
|
|
|
|
if (!keep)
|
|
{
|
|
sigset_t oldset;
|
|
int unlink_errno;
|
|
char *ifbase = last_component (ifname);
|
|
int ufd = atdir_eq (ifname, ifbase - ifname) ? dfd : -1;
|
|
int res;
|
|
|
|
sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
|
|
remove_ofname_fd = -1;
|
|
res = ufd < 0 ? xunlink (ifname) : unlinkat (ufd, ifbase, 0);
|
|
unlink_errno = res == 0 ? 0 : errno;
|
|
sigprocmask (SIG_SETMASK, &oldset, NULL);
|
|
|
|
if (unlink_errno)
|
|
WARN ((stderr, "%s: %s: %s\n", program_name, ifname,
|
|
strerror (unlink_errno)));
|
|
}
|
|
}
|
|
|
|
if (method == -1) {
|
|
if (!to_stdout)
|
|
remove_output_file (false);
|
|
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)
|
|
fprintf(stderr, " -- %s %s", keep ? "created" : "replaced with",
|
|
ofname);
|
|
fprintf(stderr, "\n");
|
|
}
|
|
}
|
|
|
|
static void
|
|
volatile_strcpy (char volatile *dst, char const volatile *src)
|
|
{
|
|
while ((*dst++ = *src++))
|
|
continue;
|
|
}
|
|
|
|
/* ========================================================================
|
|
* 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.
|
|
*/
|
|
static int
|
|
create_outfile ()
|
|
{
|
|
static bool signal_handlers_installed;
|
|
int name_shortened = 0;
|
|
int flags = (O_WRONLY | O_CREAT | O_EXCL
|
|
| (ascii && decompress ? 0 : O_BINARY));
|
|
char const *base = ofname;
|
|
int atfd = AT_FDCWD;
|
|
|
|
if (!keep)
|
|
{
|
|
char const *b = last_component (ofname);
|
|
int f = atdir_set (ofname, b - ofname);
|
|
if (0 <= f)
|
|
{
|
|
base = b;
|
|
atfd = f;
|
|
}
|
|
}
|
|
|
|
if (!signal_handlers_installed)
|
|
{
|
|
signal_handlers_installed = true;
|
|
install_signal_handlers ();
|
|
}
|
|
|
|
for (;;)
|
|
{
|
|
int open_errno;
|
|
sigset_t oldset;
|
|
|
|
volatile_strcpy (remove_ofname, ofname);
|
|
|
|
sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
|
|
remove_ofname_fd = ofd = openat (atfd, base, flags, S_IRUSR | S_IWUSR);
|
|
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:
|
|
write_error ();
|
|
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.
|
|
*/
|
|
static char *
|
|
get_suffix (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, NULL};
|
|
char const **suf;
|
|
bool suffix_of_builtin = false;
|
|
|
|
/* Normally put Z_SUFFIX at the start of KNOWN_SUFFIXES, but if it
|
|
is a suffix of one of them, put it at the end. */
|
|
for (suf = known_suffixes + 1; *suf; suf++)
|
|
{
|
|
size_t suflen = strlen (*suf);
|
|
if (z_len < suflen && strequ (z_suffix, *suf + suflen - z_len))
|
|
{
|
|
suffix_of_builtin = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
char *z_lower = xstrdup(z_suffix);
|
|
strlwr(z_lower);
|
|
known_suffixes[suffix_of_builtin
|
|
? sizeof known_suffixes / sizeof *known_suffixes - 2
|
|
: 0] = z_lower;
|
|
suf = known_suffixes + suffix_of_builtin;
|
|
|
|
nlen = strlen(name);
|
|
if (nlen <= MAX_SUFFIX+2) {
|
|
strcpy(suffix, name);
|
|
} else {
|
|
strcpy(suffix, name+nlen-MAX_SUFFIX-2);
|
|
}
|
|
strlwr(suffix);
|
|
slen = strlen(suffix);
|
|
char *match = NULL;
|
|
do {
|
|
int s = strlen(*suf);
|
|
if (slen > s && ! ISSLASH (suffix[slen - s - 1])
|
|
&& strequ(suffix + slen - s, *suf)) {
|
|
match = name+nlen-s;
|
|
break;
|
|
}
|
|
} while (*++suf != NULL);
|
|
free(z_lower);
|
|
|
|
return match;
|
|
}
|
|
|
|
|
|
/* Open file NAME with the given flags and store its status
|
|
into *ST. Return a file descriptor to the newly opened file, or -1
|
|
(setting errno) on failure. */
|
|
static int
|
|
open_and_stat (char *name, int flags, struct stat *st)
|
|
{
|
|
int fd;
|
|
int atfd = AT_FDCWD;
|
|
char const *base = name;
|
|
|
|
/* Refuse to follow symbolic links unless -c or -f. */
|
|
if (!to_stdout && !force)
|
|
{
|
|
if (HAVE_WORKING_O_NOFOLLOW)
|
|
flags |= O_NOFOLLOW;
|
|
else
|
|
{
|
|
#ifdef S_ISLNK
|
|
if (lstat (name, st) != 0)
|
|
return -1;
|
|
else if (S_ISLNK (st->st_mode))
|
|
{
|
|
errno = ELOOP;
|
|
return -1;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
if (!keep)
|
|
{
|
|
char const *b = last_component (name);
|
|
int f = atdir_set (name, b - name);
|
|
if (0 <= f)
|
|
{
|
|
base = b;
|
|
atfd = f;
|
|
}
|
|
}
|
|
|
|
fd = openat (atfd, base, flags);
|
|
if (0 <= fd && fstat (fd, st) != 0)
|
|
{
|
|
int e = errno;
|
|
close (fd);
|
|
errno = e;
|
|
return -1;
|
|
}
|
|
return fd;
|
|
}
|
|
|
|
|
|
/* ========================================================================
|
|
* Set ifname to the input file name (with a suffix appended if necessary)
|
|
* and istat to its stats. For decompression, if no file exists with the
|
|
* original name, try adding successively z_suffix, .gz, .z, -z and .Z.
|
|
* For MSDOS, we try only z_suffix and z.
|
|
* Return an open file descriptor or -1.
|
|
*/
|
|
static int
|
|
open_input_file (char *iname, struct stat *sbuf)
|
|
{
|
|
int ilen; /* strlen(ifname) */
|
|
int z_suffix_errno = 0;
|
|
static char const *suffixes[] = {NULL, ".gz", ".z", "-z", ".Z", NULL};
|
|
char const **suf = suffixes;
|
|
char const *s;
|
|
#ifdef NO_MULTIPLE_DOTS
|
|
char *dot; /* pointer to ifname extension, or NULL */
|
|
#endif
|
|
int fd;
|
|
int open_flags = (O_RDONLY | O_NONBLOCK | O_NOCTTY
|
|
| (ascii && !decompress ? 0 : O_BINARY));
|
|
|
|
*suf = z_suffix;
|
|
|
|
if (sizeof ifname - 1 <= strlen (iname))
|
|
goto name_too_long;
|
|
|
|
strcpy(ifname, iname);
|
|
|
|
/* If input file exists, return OK. */
|
|
fd = open_and_stat (ifname, open_flags, sbuf);
|
|
if (0 <= fd)
|
|
return fd;
|
|
|
|
if (!decompress || errno != ENOENT) {
|
|
progerror(ifname);
|
|
return -1;
|
|
}
|
|
/* File.ext doesn't exist. Try adding a suffix. */
|
|
s = get_suffix(ifname);
|
|
if (s != NULL) {
|
|
progerror(ifname); /* ifname already has z suffix and does not exist */
|
|
return -1;
|
|
}
|
|
#ifdef NO_MULTIPLE_DOTS
|
|
dot = strrchr(ifname, '.');
|
|
if (dot == NULL) {
|
|
strcat(ifname, ".");
|
|
dot = strrchr(ifname, '.');
|
|
}
|
|
#endif
|
|
ilen = strlen(ifname);
|
|
if (strequ(z_suffix, ".gz")) suf++;
|
|
|
|
/* Search for all suffixes */
|
|
do {
|
|
char const *s0 = s = *suf;
|
|
strcpy (ifname, iname);
|
|
#ifdef NO_MULTIPLE_DOTS
|
|
if (*s == '.') s++;
|
|
if (*dot == '\0') strcpy (dot, ".");
|
|
#endif
|
|
#ifdef MAX_EXT_CHARS
|
|
if (MAX_EXT_CHARS < strlen (s) + strlen (dot + 1))
|
|
dot[MAX_EXT_CHARS + 1 - strlen (s)] = '\0';
|
|
#endif
|
|
if (sizeof ifname <= ilen + strlen (s))
|
|
goto name_too_long;
|
|
strcat(ifname, s);
|
|
fd = open_and_stat (ifname, open_flags, sbuf);
|
|
if (0 <= fd)
|
|
return fd;
|
|
if (errno != ENOENT)
|
|
{
|
|
progerror (ifname);
|
|
return -1;
|
|
}
|
|
if (strequ (s0, z_suffix))
|
|
z_suffix_errno = errno;
|
|
} while (*++suf != NULL);
|
|
|
|
/* No suffix found, complain using z_suffix: */
|
|
strcpy(ifname, iname);
|
|
#ifdef NO_MULTIPLE_DOTS
|
|
if (*dot == '\0') strcpy(dot, ".");
|
|
#endif
|
|
#ifdef MAX_EXT_CHARS
|
|
if (MAX_EXT_CHARS < z_len + strlen (dot + 1))
|
|
dot[MAX_EXT_CHARS + 1 - z_len] = '\0';
|
|
#endif
|
|
strcat(ifname, z_suffix);
|
|
errno = z_suffix_errno;
|
|
progerror(ifname);
|
|
return -1;
|
|
|
|
name_too_long:
|
|
fprintf (stderr, "%s: %s: file name too long\n", program_name, iname);
|
|
exit_code = ERROR;
|
|
return -1;
|
|
}
|
|
|
|
/* ========================================================================
|
|
* Generate ofname given ifname. Return OK, or WARNING if file must be skipped.
|
|
* Sets save_orig_name to true if the file name has been truncated.
|
|
*/
|
|
static int
|
|
make_ofname ()
|
|
{
|
|
char *suff; /* ofname z suffix */
|
|
|
|
strcpy(ofname, ifname);
|
|
/* strip a version number if any and get the gzip suffix if present: */
|
|
suff = get_suffix(ofname);
|
|
|
|
if (decompress) {
|
|
if (suff == NULL) {
|
|
/* With -t or -l, try all files (even without .gz suffix)
|
|
* except with -r (behave as with just -dr).
|
|
*/
|
|
if (!recursive && test)
|
|
return OK;
|
|
|
|
/* Avoid annoying messages with -r */
|
|
if (verbose || (!recursive && !quiet)) {
|
|
WARN((stderr,"%s: %s: unknown suffix -- ignored\n",
|
|
program_name, ifname));
|
|
}
|
|
return WARNING;
|
|
}
|
|
/* Make a special case for .tgz and .taz: */
|
|
strlwr(suff);
|
|
if (strequ(suff, ".tgz") || strequ(suff, ".taz")) {
|
|
strcpy(suff, ".tar");
|
|
} else {
|
|
*suff = '\0'; /* strip the z suffix */
|
|
}
|
|
/* ofname might be changed later if infile contains an original name */
|
|
|
|
} else if (suff && ! force) {
|
|
/* Avoid annoying messages with -r (see treat_dir()) */
|
|
if (verbose || (!recursive && !quiet)) {
|
|
/* Don't use WARN, as it affects exit status. */
|
|
fprintf (stderr, "%s: %s already has %s suffix -- unchanged\n",
|
|
program_name, ifname, suff);
|
|
}
|
|
return WARNING;
|
|
} else {
|
|
save_orig_name = 0;
|
|
|
|
#ifdef NO_MULTIPLE_DOTS
|
|
suff = strrchr(ofname, '.');
|
|
if (suff == NULL) {
|
|
if (sizeof ofname <= strlen (ofname) + 1)
|
|
goto name_too_long;
|
|
strcat(ofname, ".");
|
|
# ifdef MAX_EXT_CHARS
|
|
if (strequ(z_suffix, "z")) {
|
|
if (sizeof ofname <= strlen (ofname) + 2)
|
|
goto name_too_long;
|
|
strcat(ofname, "gz"); /* enough room */
|
|
return OK;
|
|
}
|
|
/* On the Atari and some versions of MSDOS,
|
|
* ENAMETOOLONG does not work correctly. So we
|
|
* must truncate here.
|
|
*/
|
|
} else if (strlen(suff)-1 + z_len > MAX_SUFFIX) {
|
|
suff[MAX_SUFFIX+1-z_len] = '\0';
|
|
save_orig_name = 1;
|
|
# endif
|
|
}
|
|
#endif /* NO_MULTIPLE_DOTS */
|
|
if (sizeof ofname <= strlen (ofname) + z_len)
|
|
goto name_too_long;
|
|
strcat(ofname, z_suffix);
|
|
|
|
} /* decompress ? */
|
|
return OK;
|
|
|
|
name_too_long:
|
|
WARN ((stderr, "%s: %s: file name too long\n", program_name, ifname));
|
|
return WARNING;
|
|
}
|
|
|
|
/* Discard NBYTES input bytes from the input, or up through the next
|
|
zero byte if NBYTES == (size_t) -1. If FLAGS say that the header
|
|
CRC should be computed, update the CRC accordingly. */
|
|
static void
|
|
discard_input_bytes (size_t nbytes, unsigned int flags)
|
|
{
|
|
while (nbytes != 0)
|
|
{
|
|
uch c = get_byte ();
|
|
if (flags & HEADER_CRC)
|
|
updcrc (&c, 1);
|
|
if (nbytes != (size_t) -1)
|
|
nbytes--;
|
|
else if (! c)
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* ========================================================================
|
|
* Check the magic number of the input file and update ofname if an
|
|
* original name was given and to_stdout is not set.
|
|
* Return the compression method, -1 for error, -2 for warning.
|
|
* Set inptr to the offset of the next byte to be processed.
|
|
* Updates time_stamp if there is one and neither -m nor -n is used.
|
|
* This function may be called repeatedly for an input file consisting
|
|
* of several contiguous gzip'ed members.
|
|
* 'in' is the input file descriptor; 'first' is true for first call on 'in'.
|
|
* IN assertions: there is at least one remaining compressed member.
|
|
* If the member is a zip file, it must be the only one.
|
|
*/
|
|
static int
|
|
get_method (int in, bool first)
|
|
{
|
|
uch flags; /* compression flags */
|
|
uch magic[10]; /* magic header */
|
|
int imagic0; /* first magic byte or EOF */
|
|
int imagic1; /* like magic[1], but can represent EOF */
|
|
ulg stamp; /* timestamp */
|
|
|
|
/* If --force and --stdout, zcat == cat, so do not complain about
|
|
* premature end of file: use try_byte instead of get_byte.
|
|
*/
|
|
if (force && to_stdout) {
|
|
imagic0 = try_byte();
|
|
magic[0] = imagic0;
|
|
imagic1 = try_byte ();
|
|
magic[1] = imagic1;
|
|
/* If try_byte returned EOF, magic[1] == (char) EOF.
|
|
Although POSIX says this could cause gzip to trap
|
|
if EOF < CHAR_MIN < 0, no known platform is like that;
|
|
check to be safe. */
|
|
static_assert (! (EOF < CHAR_MIN && CHAR_MIN < 0));
|
|
} else {
|
|
magic[0] = get_byte ();
|
|
imagic0 = 0;
|
|
if (magic[0]) {
|
|
magic[1] = get_byte ();
|
|
imagic1 = 0; /* avoid lint warning */
|
|
} else {
|
|
imagic1 = try_byte ();
|
|
magic[1] = imagic1;
|
|
}
|
|
}
|
|
method = -1; /* unknown yet */
|
|
part_nb++; /* number of parts in gzip file */
|
|
header_bytes = 0;
|
|
last_member = 0;
|
|
/* assume multiple members in gzip file except for record oriented I/O */
|
|
|
|
if (memcmp(magic, GZIP_MAGIC, 2) == 0
|
|
|| memcmp(magic, OLD_GZIP_MAGIC, 2) == 0) {
|
|
|
|
method = (int)get_byte();
|
|
if (method != DEFLATED) {
|
|
fprintf(stderr,
|
|
"%s: %s: unknown method %d -- not supported\n",
|
|
program_name, ifname, method);
|
|
exit_code = ERROR;
|
|
return -1;
|
|
}
|
|
work = unzip;
|
|
flags = (uch)get_byte();
|
|
|
|
if ((flags & ENCRYPTED) != 0) {
|
|
fprintf(stderr,
|
|
"%s: %s is encrypted -- not supported\n",
|
|
program_name, ifname);
|
|
exit_code = ERROR;
|
|
return -1;
|
|
}
|
|
if ((flags & RESERVED) != 0) {
|
|
fprintf(stderr,
|
|
"%s: %s has flags 0x%x -- not supported\n",
|
|
program_name, ifname, flags);
|
|
exit_code = ERROR;
|
|
if (force <= 1) return -1;
|
|
}
|
|
stamp = (ulg)get_byte();
|
|
stamp |= ((ulg)get_byte()) << 8;
|
|
stamp |= ((ulg)get_byte()) << 16;
|
|
stamp |= ((ulg)get_byte()) << 24;
|
|
if (stamp != 0 && !no_time)
|
|
{
|
|
if (stamp <= TYPE_MAXIMUM (time_t))
|
|
{
|
|
time_stamp.tv_sec = stamp;
|
|
time_stamp.tv_nsec = 0;
|
|
}
|
|
else
|
|
{
|
|
WARN ((stderr,
|
|
"%s: %s: MTIME %lu out of range for this platform\n",
|
|
program_name, ifname, stamp));
|
|
time_stamp.tv_sec = TYPE_MAXIMUM (time_t);
|
|
time_stamp.tv_nsec = TIMESPEC_RESOLUTION - 1;
|
|
}
|
|
}
|
|
|
|
magic[8] = get_byte (); /* Ignore extra flags. */
|
|
magic[9] = get_byte (); /* Ignore OS type. */
|
|
|
|
if (flags & HEADER_CRC)
|
|
{
|
|
magic[2] = DEFLATED;
|
|
magic[3] = flags;
|
|
magic[4] = stamp & 0xff;
|
|
magic[5] = (stamp >> 8) & 0xff;
|
|
magic[6] = (stamp >> 16) & 0xff;
|
|
magic[7] = stamp >> 24;
|
|
updcrc (NULL, 0);
|
|
updcrc (magic, 10);
|
|
}
|
|
|
|
if ((flags & EXTRA_FIELD) != 0) {
|
|
uch lenbuf[2];
|
|
unsigned int len = lenbuf[0] = get_byte ();
|
|
len |= (lenbuf[1] = get_byte ()) << 8;
|
|
if (verbose) {
|
|
fprintf(stderr,"%s: %s: extra field of %u bytes ignored\n",
|
|
program_name, ifname, len);
|
|
}
|
|
if (flags & HEADER_CRC)
|
|
updcrc (lenbuf, 2);
|
|
discard_input_bytes (len, flags);
|
|
}
|
|
|
|
/* Get original file name if it was truncated */
|
|
if ((flags & ORIG_NAME) != 0) {
|
|
if (no_name || (to_stdout && !list) || part_nb > 1) {
|
|
/* Discard the old name */
|
|
discard_input_bytes (-1, flags);
|
|
} else {
|
|
/* Copy the base name. Keep a directory prefix intact. */
|
|
char *p = gzip_base_name (ofname);
|
|
char *base = p;
|
|
for (;;) {
|
|
*p = (char) get_byte ();
|
|
if (*p++ == '\0') break;
|
|
if (p >= ofname+sizeof(ofname)) {
|
|
gzip_error ("corrupted input -- file name too large");
|
|
}
|
|
}
|
|
if (flags & HEADER_CRC)
|
|
updcrc ((uch *) base, p - base);
|
|
p = gzip_base_name (base);
|
|
memmove (base, p, strlen (p) + 1);
|
|
/* If necessary, adapt the name to local OS conventions: */
|
|
if (!list) {
|
|
MAKE_LEGAL_NAME(base);
|
|
if (base) list=0; /* avoid warning about unused variable */
|
|
}
|
|
} /* no_name || to_stdout */
|
|
} /* ORIG_NAME */
|
|
|
|
/* Discard file comment if any */
|
|
if ((flags & COMMENT) != 0) {
|
|
discard_input_bytes (-1, flags);
|
|
}
|
|
|
|
if (flags & HEADER_CRC)
|
|
{
|
|
unsigned int crc16 = updcrc (magic, 0) & 0xffff;
|
|
unsigned int header16 = get_byte ();
|
|
header16 |= ((unsigned int) get_byte ()) << 8;
|
|
if (header16 != crc16)
|
|
{
|
|
fprintf (stderr,
|
|
"%s: %s: header checksum 0x%04x != computed checksum 0x%04x\n",
|
|
program_name, ifname, header16, crc16);
|
|
exit_code = ERROR;
|
|
if (force <= 1)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (part_nb == 1) {
|
|
header_bytes = inptr + 2*4; /* include crc and size */
|
|
}
|
|
|
|
} else if (first && memcmp (magic, PKZIP_MAGIC, 2) == 0) {
|
|
/* To simplify the code, we support a zip file when alone only.
|
|
* We are thus guaranteed that the entire local header fits in inbuf.
|
|
*/
|
|
inptr = 0;
|
|
work = unzip;
|
|
if (check_zipfile(in) != OK) return -1;
|
|
/* check_zipfile may get ofname from the local header */
|
|
last_member = 1;
|
|
|
|
} else if (memcmp(magic, PACK_MAGIC, 2) == 0) {
|
|
work = unpack;
|
|
method = PACKED;
|
|
|
|
} else if (memcmp(magic, LZW_MAGIC, 2) == 0) {
|
|
work = unlzw;
|
|
method = COMPRESSED;
|
|
last_member = 1;
|
|
|
|
} else if (memcmp(magic, LZH_MAGIC, 2) == 0) {
|
|
work = unlzh;
|
|
method = LZHED;
|
|
last_member = 1;
|
|
|
|
} else if (force && to_stdout && !list) { /* pass input unchanged */
|
|
method = STORED;
|
|
work = copy;
|
|
if (imagic1 != EOF)
|
|
inptr--;
|
|
last_member = 1;
|
|
if (imagic0 != EOF) {
|
|
write_buf (STDOUT_FILENO, magic, 1);
|
|
}
|
|
}
|
|
if (method >= 0) return method;
|
|
|
|
if (part_nb == 1) {
|
|
fprintf (stderr, "\n%s: %s: not in gzip format\n",
|
|
program_name, ifname);
|
|
exit_code = ERROR;
|
|
return -1;
|
|
} else {
|
|
if (magic[0] == 0)
|
|
{
|
|
int inbyte;
|
|
for (inbyte = imagic1; inbyte == 0; inbyte = try_byte ())
|
|
continue;
|
|
if (inbyte == EOF)
|
|
{
|
|
if (verbose)
|
|
WARN ((stderr, "\n%s: %s: decompression OK, trailing zero bytes ignored\n",
|
|
program_name, ifname));
|
|
return -3;
|
|
}
|
|
}
|
|
|
|
WARN((stderr, "\n%s: %s: decompression OK, trailing garbage ignored\n",
|
|
program_name, ifname));
|
|
return -2;
|
|
}
|
|
}
|
|
|
|
/* ========================================================================
|
|
* Display the characteristics of the compressed file.
|
|
* If the given method is < 0, display the accumulated totals.
|
|
* IN assertions: time_stamp, header_bytes and ifile_size are initialized.
|
|
*/
|
|
static void
|
|
do_list (int method)
|
|
{
|
|
ulg crc; /* original crc */
|
|
static int first_time = 1;
|
|
static char const *const methods[MAX_METHODS] = {
|
|
"store", /* 0 */
|
|
"compr", /* 1 */
|
|
"pack ", /* 2 */
|
|
"lzh ", /* 3 */
|
|
"", "", "", "", /* 4 to 7 reserved */
|
|
"defla"}; /* 8 */
|
|
int positive_off_t_width = INT_STRLEN_BOUND (off_t) - 1;
|
|
|
|
if (first_time && method >= 0) {
|
|
first_time = 0;
|
|
if (verbose) {
|
|
printf("method crc date time ");
|
|
}
|
|
if (!quiet) {
|
|
printf("%*.*s %*.*s ratio uncompressed_name\n",
|
|
positive_off_t_width, positive_off_t_width, "compressed",
|
|
positive_off_t_width, positive_off_t_width, "uncompressed");
|
|
}
|
|
} else if (method < 0) {
|
|
if (total_in <= 0 || total_out <= 0) return;
|
|
if (verbose) {
|
|
printf(" ");
|
|
}
|
|
if (verbose || !quiet)
|
|
printf ("%*jd %*jd ", positive_off_t_width, (intmax_t) total_in,
|
|
positive_off_t_width, (intmax_t) total_out);
|
|
display_ratio(total_out-(total_in-header_bytes), total_out, stdout);
|
|
/* header_bytes is not meaningful but used to ensure the same
|
|
* ratio if there is a single file.
|
|
*/
|
|
printf(" (totals)\n");
|
|
return;
|
|
}
|
|
crc = (ulg)~0; /* unknown */
|
|
|
|
if (method == DEFLATED && !last_member) {
|
|
crc = unzip_crc;
|
|
}
|
|
|
|
if (verbose)
|
|
{
|
|
static char const month_abbr[][4]
|
|
= { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
|
|
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
|
|
struct tm *tm = localtime (&time_stamp.tv_sec);
|
|
printf ("%5s %08lx ", methods[method], crc);
|
|
if (tm)
|
|
printf ("%s%3d %02d:%02d ", month_abbr[tm->tm_mon],
|
|
tm->tm_mday, tm->tm_hour, tm->tm_min);
|
|
else
|
|
printf ("??? ?? ??:?? ");
|
|
}
|
|
printf ("%*jd %*jd ", positive_off_t_width, (intmax_t) bytes_in,
|
|
positive_off_t_width, (intmax_t) bytes_out);
|
|
if (bytes_in == -1L) {
|
|
total_in = -1L;
|
|
bytes_in = bytes_out = header_bytes = 0;
|
|
} else if (total_in >= 0) {
|
|
total_in += bytes_in;
|
|
}
|
|
if (bytes_out == -1L) {
|
|
total_out = -1L;
|
|
bytes_in = bytes_out = header_bytes = 0;
|
|
} else if (total_out >= 0) {
|
|
total_out += bytes_out;
|
|
}
|
|
display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out, stdout);
|
|
printf(" %s\n", ofname);
|
|
}
|
|
|
|
/* ========================================================================
|
|
* Shorten the given name by one character, or replace a .tar extension
|
|
* with .tgz. Truncate the last part of the name which is longer than
|
|
* MIN_PART characters: 1234.678.012.gz -> 123.678.012.gz. If the name
|
|
* has only parts shorter than MIN_PART truncate the longest part.
|
|
* For decompression, just remove the last character of the name.
|
|
*
|
|
* IN assertion: for compression, the suffix of the given name is z_suffix.
|
|
*/
|
|
static void
|
|
shorten_name (char *name)
|
|
{
|
|
int len; /* length of name without z_suffix */
|
|
char *trunc = NULL; /* character to be truncated */
|
|
int plen; /* current part length */
|
|
int min_part = MIN_PART; /* current minimum part length */
|
|
char *p;
|
|
|
|
len = strlen(name);
|
|
if (decompress) {
|
|
if (len <= 1)
|
|
gzip_error ("name too short");
|
|
name[len-1] = '\0';
|
|
return;
|
|
}
|
|
p = get_suffix(name);
|
|
if (! p)
|
|
gzip_error ("can't recover suffix\n");
|
|
*p = '\0';
|
|
save_orig_name = 1;
|
|
|
|
/* compress 1234567890.tar to 1234567890.tgz */
|
|
if (len > 4 && strequ(p-4, ".tar")) {
|
|
strcpy(p-4, ".tgz");
|
|
return;
|
|
}
|
|
/* Try keeping short extensions intact:
|
|
* 1234.678.012.gz -> 123.678.012.gz
|
|
*/
|
|
do {
|
|
p = last_component (name);
|
|
while (*p) {
|
|
plen = strcspn(p, PART_SEP);
|
|
p += plen;
|
|
if (plen > min_part) trunc = p-1;
|
|
if (*p) p++;
|
|
}
|
|
} while (trunc == NULL && --min_part != 0);
|
|
|
|
if (trunc != NULL) {
|
|
do {
|
|
trunc[0] = trunc[1];
|
|
} while (*trunc++);
|
|
trunc--;
|
|
} else {
|
|
trunc = strrchr(name, PART_SEP[0]);
|
|
if (!trunc)
|
|
gzip_error ("internal error in shorten_name");
|
|
if (trunc[1] == '\0') trunc--; /* force truncation */
|
|
}
|
|
strcpy(trunc, z_suffix);
|
|
}
|
|
|
|
/* ========================================================================
|
|
* The compressed file already exists, so ask for confirmation.
|
|
* Return ERROR if the file must be skipped.
|
|
*/
|
|
static int
|
|
check_ofname ()
|
|
{
|
|
/* Ask permission to overwrite the existing file */
|
|
if (!force) {
|
|
int ok = 0;
|
|
fprintf (stderr, "%s: %s already exists;", program_name, ofname);
|
|
if (foreground && (presume_input_tty || isatty (STDIN_FILENO))) {
|
|
fprintf(stderr, " do you wish to overwrite (y or n)? ");
|
|
fflush(stderr);
|
|
ok = yesno();
|
|
}
|
|
if (!ok) {
|
|
fprintf(stderr, "\tnot overwritten\n");
|
|
if (exit_code == OK) exit_code = WARNING;
|
|
return ERROR;
|
|
}
|
|
}
|
|
if (xunlink (ofname)) {
|
|
progerror(ofname);
|
|
return ERROR;
|
|
}
|
|
return OK;
|
|
}
|
|
|
|
/* Change the owner and group of a file. FD is a file descriptor for
|
|
the file and NAME its name. Change it to user UID and to group GID.
|
|
If UID or GID is -1, though, do not change the corresponding user
|
|
or group. */
|
|
#if ! (HAVE_FCHOWN || HAVE_CHOWN)
|
|
/* The types uid_t and gid_t do not exist on mingw, so don't assume them. */
|
|
# define do_chown(fd, name, uid, gid) ((void) 0)
|
|
#else
|
|
static void
|
|
do_chown (int fd, char const *name, uid_t uid, gid_t gid)
|
|
{
|
|
# if HAVE_FCHOWN
|
|
ignore_value (fchown (fd, uid, gid));
|
|
# else
|
|
ignore_value (chown (name, uid, gid));
|
|
# endif
|
|
}
|
|
#endif
|
|
|
|
/* ========================================================================
|
|
* Copy modes, times, ownership from input file to output file.
|
|
* IN assertion: to_stdout is false.
|
|
*/
|
|
static void
|
|
copy_stat (struct stat *ifstat)
|
|
{
|
|
mode_t mode = ifstat->st_mode & S_IRWXUGO;
|
|
int r;
|
|
|
|
#ifndef NO_UTIME
|
|
bool restoring;
|
|
struct timespec timespec[2];
|
|
timespec[0] = get_stat_atime (ifstat);
|
|
timespec[1] = get_stat_mtime (ifstat);
|
|
restoring = (decompress && 0 <= time_stamp.tv_nsec
|
|
&& ! (timespec[1].tv_sec == time_stamp.tv_sec
|
|
&& timespec[1].tv_nsec == time_stamp.tv_nsec));
|
|
if (restoring)
|
|
timespec[1] = time_stamp;
|
|
|
|
if (fdutimens (ofd, ofname, timespec) == 0)
|
|
{
|
|
if (restoring && 1 < verbose) {
|
|
fprintf(stderr, "%s: timestamp restored\n", ofname);
|
|
}
|
|
}
|
|
else
|
|
WARN ((stderr, "%s: %s: %s\n", program_name, ofname, strerror (errno)));
|
|
#endif
|
|
|
|
/* Change the group first, then the permissions, then the owner.
|
|
That way, the permissions will be correct on systems that allow
|
|
users to give away files, without introducing a security hole.
|
|
Security depends on permissions not containing the setuid or
|
|
setgid bits. */
|
|
|
|
do_chown (ofd, ofname, -1, ifstat->st_gid);
|
|
|
|
#if HAVE_FCHMOD
|
|
r = fchmod (ofd, mode);
|
|
#else
|
|
r = chmod (ofname, mode);
|
|
#endif
|
|
if (r != 0)
|
|
WARN ((stderr, "%s: %s: %s\n", program_name, ofname, strerror (errno)));
|
|
|
|
do_chown (ofd, ofname, ifstat->st_uid, -1);
|
|
}
|
|
|
|
#if ! NO_DIR
|
|
|
|
/* ========================================================================
|
|
* Recurse through the given directory.
|
|
*/
|
|
static void
|
|
treat_dir (int fd, char *dir)
|
|
{
|
|
DIR *dirp;
|
|
char nbuf[MAX_PATH_LEN];
|
|
char *entries;
|
|
char const *entry;
|
|
size_t entrylen;
|
|
|
|
dirp = fdopendir (fd);
|
|
|
|
if (dirp == NULL) {
|
|
progerror(dir);
|
|
close (fd);
|
|
return ;
|
|
}
|
|
|
|
entries = streamsavedir (dirp, SAVEDIR_SORT_NONE);
|
|
if (! entries)
|
|
progerror (dir);
|
|
if (closedir (dirp) != 0)
|
|
progerror (dir);
|
|
if (! entries)
|
|
return;
|
|
|
|
for (entry = entries; *entry; entry += entrylen + 1) {
|
|
size_t len = strlen (dir);
|
|
entrylen = strlen (entry);
|
|
if (strequ (entry, ".") || strequ (entry, ".."))
|
|
continue;
|
|
if (len + entrylen < MAX_PATH_LEN - 2) {
|
|
strcpy(nbuf,dir);
|
|
if (*last_component (nbuf) && !ISSLASH (nbuf[len - 1]))
|
|
nbuf[len++] = '/';
|
|
strcpy (nbuf + len, entry);
|
|
treat_file(nbuf);
|
|
} else {
|
|
fprintf(stderr,"%s: %s/%s: pathname too long\n",
|
|
program_name, dir, entry);
|
|
exit_code = ERROR;
|
|
}
|
|
}
|
|
free (entries);
|
|
}
|
|
#endif /* ! NO_DIR */
|
|
|
|
/* Make sure signals get handled properly. */
|
|
|
|
static void
|
|
install_signal_handlers ()
|
|
{
|
|
int nsigs = sizeof handled_sig / sizeof handled_sig[0];
|
|
int i;
|
|
struct sigaction act;
|
|
|
|
sigemptyset (&caught_signals);
|
|
for (i = 0; i < nsigs; i++)
|
|
{
|
|
sigaction (handled_sig[i], NULL, &act);
|
|
if (act.sa_handler != SIG_IGN)
|
|
sigaddset (&caught_signals, handled_sig[i]);
|
|
}
|
|
|
|
act.sa_handler = abort_gzip_signal;
|
|
act.sa_mask = caught_signals;
|
|
act.sa_flags = 0;
|
|
|
|
for (i = 0; i < nsigs; i++)
|
|
if (sigismember (&caught_signals, handled_sig[i]))
|
|
{
|
|
if (i == 0)
|
|
foreground = 1;
|
|
sigaction (handled_sig[i], &act, NULL);
|
|
}
|
|
}
|
|
|
|
/* ========================================================================
|
|
* Free all dynamically allocated variables and exit with the given code.
|
|
*/
|
|
static void
|
|
do_exit (int exitcode)
|
|
{
|
|
static int in_exit = 0;
|
|
|
|
if (in_exit) exit(exitcode);
|
|
in_exit = 1;
|
|
free(env);
|
|
env = NULL;
|
|
FREE(inbuf);
|
|
FREE(outbuf);
|
|
FREE(d_buf);
|
|
FREE(window);
|
|
#ifndef MAXSEG_64K
|
|
FREE(tab_prefix);
|
|
#else
|
|
FREE(tab_prefix0);
|
|
FREE(tab_prefix1);
|
|
#endif
|
|
exit(exitcode);
|
|
}
|
|
|
|
static void
|
|
finish_out ()
|
|
{
|
|
if (fclose (stdout) != 0)
|
|
write_error ();
|
|
do_exit (OK);
|
|
}
|
|
|
|
/* ========================================================================
|
|
* Close and unlink the output file.
|
|
*/
|
|
static void
|
|
remove_output_file (bool signals_already_blocked)
|
|
{
|
|
int fd;
|
|
sigset_t oldset;
|
|
|
|
if (!signals_already_blocked)
|
|
sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
|
|
fd = remove_ofname_fd;
|
|
if (0 <= fd)
|
|
{
|
|
char fname[MAX_PATH_LEN];
|
|
remove_ofname_fd = -1;
|
|
close (fd);
|
|
volatile_strcpy (fname, remove_ofname);
|
|
xunlink (fname);
|
|
}
|
|
if (!signals_already_blocked)
|
|
sigprocmask (SIG_SETMASK, &oldset, NULL);
|
|
}
|
|
|
|
/* ========================================================================
|
|
* Error handler.
|
|
*/
|
|
void
|
|
finish_up_gzip (int exitcode)
|
|
{
|
|
if (0 <= remove_ofname_fd)
|
|
remove_output_file (false);
|
|
do_exit (exitcode);
|
|
}
|
|
void
|
|
abort_gzip ()
|
|
{
|
|
finish_up_gzip (ERROR);
|
|
}
|
|
/* ========================================================================
|
|
* Signal handler.
|
|
*/
|
|
static void
|
|
abort_gzip_signal (int sig)
|
|
{
|
|
remove_output_file (true);
|
|
signal (sig, SIG_DFL);
|
|
raise (sig);
|
|
}
|