1 /* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
3 Copyright (C) 1999, 2001-2002, 2006-2007, 2009-2016 Free Software
5 Copyright (C) 1992-1993 Jean-loup Gailly
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software Foundation,
19 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
22 * The unzip code was written and put in the public domain by Mark Adler.
23 * Portions of the lzw code are derived from the public domain 'compress'
24 * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
25 * Ken Turkowski, Dave Mack and Peter Jannesen.
27 * See the license_msg below and the file COPYING for the software license.
28 * See the file algorithm.doc for the compression algorithms and file formats.
31 static char const *const license_msg[] = {
32 "Copyright (C) 2016 Free Software Foundation, Inc.",
33 "Copyright (C) 1993 Jean-loup Gailly.",
34 "This is free software. You may redistribute copies of it under the terms of",
35 "the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.",
36 "There is NO WARRANTY, to the extent permitted by law.",
39 /* Compress files with zip algorithm and 'compress' interface.
40 * See help() function below for all options.
42 * file.gz: compressed file with same mode, owner, and utimes
43 * or stdout with -c option or if stdin used as input.
44 * If the output file name had to be truncated, the original name is kept
45 * in the compressed file.
46 * On MSDOS, file.tmp -> file.tmz. On VMS, file.tmp -> file.tmp-gz.
48 * Using gz on MSDOS would create too many file name conflicts. For
49 * example, foo.txt -> foo.tgz (.tgz must be reserved as shorthand for
50 * tar.gz). Similarly, foo.dir and foo.doc would both be mapped to foo.dgz.
51 * I also considered 12345678.txt -> 12345txt.gz but this truncates the name
52 * too heavily. There is no ideal solution given the MSDOS 8+3 limitation.
54 * For the meaning of all compilation flags, see comments in Makefile.in.
59 #include <sys/types.h>
77 #include "ignore-value.h"
78 #include "stat-time.h"
102 # define MAX_PATH_LEN 1024 /* max pathname length */
114 off_t lseek (int fd, off_t offset, int whence);
118 # define OFF_T_MAX TYPE_MAXIMUM (off_t)
121 /* Use SA_NOCLDSTOP as a proxy for whether the sigaction machinery is
124 # define SA_NOCLDSTOP 0
125 # define sigprocmask(how, set, oset) /* empty */
126 # define sigset_t int
127 # if ! HAVE_SIGINTERRUPT
128 # define siginterrupt(sig, flag) /* empty */
132 #ifndef HAVE_WORKING_O_NOFOLLOW
133 # define HAVE_WORKING_O_NOFOLLOW 0
136 /* Separator for file name parts (see shorten_name()) */
137 #ifdef NO_MULTIPLE_DOTS
138 # define PART_SEP "-"
140 # define PART_SEP "."
145 DECLARE(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
146 DECLARE(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
147 DECLARE(ush, d_buf, DIST_BUFSIZE);
148 DECLARE(uch, window, 2L*WSIZE);
150 DECLARE(ush, tab_prefix, 1L<<BITS);
152 DECLARE(ush, tab_prefix0, 1L<<(BITS-1));
153 DECLARE(ush, tab_prefix1, 1L<<(BITS-1));
156 /* local variables */
158 /* If true, pretend that standard input is a tty. This option
159 is deliberately not documented, and only for testing. */
160 static bool presume_input_tty;
162 /* If true, transfer output data to the output file's storage device
163 when supported. Otherwise, if the system crashes around the time
164 gzip is run, the user might lose both input and output data. See:
165 Pillai TS et al. All file systems are not created equal: on the
166 complexity of crafting crash-consistent applications. OSDI'14. 2014:433-48.
167 https://www.usenix.org/conference/osdi14/technical-sessions/presentation/pillai */
168 static bool synchronous;
170 static int ascii = 0; /* convert end-of-lines to local OS conventions */
171 int to_stdout = 0; /* output to stdout (-c) */
172 static int decompress = 0; /* decompress (-d) */
173 static int force = 0; /* don't ask questions, compress links (-f) */
174 static int keep = 0; /* keep (don't delete) input files */
175 static int no_name = -1; /* don't save or restore the original file name */
176 static int no_time = -1; /* don't save or restore the original file time */
177 static int recursive = 0; /* recurse through directories (-r) */
178 static int list = 0; /* list the file contents (-l) */
179 int verbose = 0; /* be verbose (-v) */
180 int quiet = 0; /* be very quiet (-q) */
181 static int do_lzw = 0; /* generate output compatible with old compress (-Z) */
182 int test = 0; /* test .gz file integrity */
183 static int foreground = 0; /* set if program run in foreground */
184 char *program_name; /* program name */
185 int maxbits = BITS; /* max bits per code for LZW */
186 int method = DEFLATED;/* compression method */
187 int level = 6; /* compression level */
188 int exit_code = OK; /* program exit code */
189 int save_orig_name; /* set if original name must be saved */
190 static int last_member; /* set for .zip and .Z files */
191 static int part_nb; /* number of parts in .gz file */
192 struct timespec time_stamp; /* original time stamp (modification time) */
193 off_t ifile_size; /* input file size, -1 for devices (debug only) */
194 static char *env; /* contents of GZIP env variable */
195 static char const *z_suffix; /* default suffix (can be set with --suffix) */
196 static size_t z_len; /* strlen(z_suffix) */
198 /* The set of signals that are caught. */
199 static sigset_t caught_signals;
201 /* If nonzero then exit with status WARNING, rather than with the usual
202 signal status, on receipt of a signal with this value. This
203 suppresses a "Broken Pipe" message with some shells. */
204 static int volatile exiting_signal;
206 /* If nonnegative, close this file descriptor and unlink ofname on error. */
207 static int volatile remove_ofname_fd = -1;
209 off_t bytes_in; /* number of input bytes */
210 off_t bytes_out; /* number of output bytes */
211 static off_t total_in; /* input bytes for all files */
212 static off_t total_out; /* output bytes for all files */
213 char ifname[MAX_PATH_LEN]; /* input file name */
214 char ofname[MAX_PATH_LEN]; /* output file name */
215 static char dfname[MAX_PATH_LEN]; /* name of dir containing output file */
216 static struct stat istat; /* status for input file */
217 int ifd; /* input file descriptor */
218 int ofd; /* output file descriptor */
219 static int dfd = -1; /* output directory file descriptor */
220 unsigned insize; /* valid bytes in inbuf */
221 unsigned inptr; /* index of next byte to be processed in inbuf */
222 unsigned outcnt; /* bytes in output buffer */
223 int rsync = 0; /* make ryncable chunks */
225 static int handled_sig[] =
227 /* SIGINT must be first, as 'foreground' depends on it. */
247 /* For long options that have no equivalent short option, use a
248 non-character as a pseudo short option, starting with CHAR_MAX + 1. */
251 PRESUME_INPUT_TTY_OPTION = CHAR_MAX + 1,
255 /* A value greater than all valid long options, used as a flag to
256 distinguish options derived from the GZIP environment variable. */
260 static char const shortopts[] = "ab:cdfhH?klLmMnNqrS:tvVZ123456789";
262 static const struct option longopts[] =
264 /* { name has_arg *flag val } */
265 {"ascii", 0, 0, 'a'}, /* ascii text mode */
266 {"to-stdout", 0, 0, 'c'}, /* write output on standard output */
267 {"stdout", 0, 0, 'c'}, /* write output on standard output */
268 {"decompress", 0, 0, 'd'}, /* decompress */
269 {"uncompress", 0, 0, 'd'}, /* decompress */
270 /* {"encrypt", 0, 0, 'e'}, encrypt */
271 {"force", 0, 0, 'f'}, /* force overwrite of output file */
272 {"help", 0, 0, 'h'}, /* give help */
273 /* {"pkzip", 0, 0, 'k'}, force output in pkzip format */
274 {"keep", 0, 0, 'k'}, /* keep (don't delete) input files */
275 {"list", 0, 0, 'l'}, /* list .gz file contents */
276 {"license", 0, 0, 'L'}, /* display software license */
277 {"no-name", 0, 0, 'n'}, /* don't save or restore original name & time */
278 {"name", 0, 0, 'N'}, /* save or restore original name & time */
279 {"-presume-input-tty", no_argument, NULL, PRESUME_INPUT_TTY_OPTION},
280 {"quiet", 0, 0, 'q'}, /* quiet mode */
281 {"silent", 0, 0, 'q'}, /* quiet mode */
282 {"synchronous",0, 0, SYNCHRONOUS_OPTION},
283 {"recursive", 0, 0, 'r'}, /* recurse through directories */
284 {"suffix", 1, 0, 'S'}, /* use given suffix instead of .gz */
285 {"test", 0, 0, 't'}, /* test compressed file integrity */
286 {"no-time", 0, 0, 'T'}, /* don't save or restore the time stamp */
287 {"verbose", 0, 0, 'v'}, /* verbose mode */
288 {"version", 0, 0, 'V'}, /* display version number */
289 {"fast", 0, 0, '1'}, /* compress faster */
290 {"best", 0, 0, '9'}, /* compress better */
291 {"lzw", 0, 0, 'Z'}, /* make output compatible with old compress */
292 {"bits", 1, 0, 'b'}, /* max number of bits per code (implies -Z) */
293 {"rsyncable", 0, 0, RSYNCABLE_OPTION}, /* make rsync-friendly archive */
297 /* local functions */
299 local void try_help (void) ATTRIBUTE_NORETURN;
300 local void help (void);
301 local void license (void);
302 local void version (void);
303 local int input_eof (void);
304 local void treat_stdin (void);
305 local void treat_file (char *iname);
306 local int create_outfile (void);
307 local char *get_suffix (char *name);
308 local int open_input_file (char *iname, struct stat *sbuf);
309 local void discard_input_bytes (size_t nbytes, unsigned int flags);
310 local int make_ofname (void);
311 local void shorten_name (char *name);
312 local int get_method (int in);
313 local void do_list (int ifd, int method);
314 local int check_ofname (void);
315 local void copy_stat (struct stat *ifstat);
316 local void install_signal_handlers (void);
317 local void remove_output_file (void);
318 local RETSIGTYPE abort_gzip_signal (int);
319 local void do_exit (int exitcode) ATTRIBUTE_NORETURN;
320 int main (int argc, char **argv);
321 static int (*work) (int infile, int outfile) = zip; /* function to call */
324 local void treat_dir (int fd, char *dir);
327 #define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
332 fprintf (stderr, "Try `%s --help' for more information.\n",
337 /* ======================================================================== */
340 static char const* const help_msg[] = {
341 "Compress or uncompress FILEs (by default, compress FILES in-place).",
343 "Mandatory arguments to long options are mandatory for short options too.",
346 " -a, --ascii ascii text; convert end-of-line using local conventions",
348 " -c, --stdout write on standard output, keep original files unchanged",
349 " -d, --decompress decompress",
350 /* -e, --encrypt encrypt */
351 " -f, --force force overwrite of output file and compress links",
352 " -h, --help give this help",
353 /* -k, --pkzip force output in pkzip format */
354 " -k, --keep keep (don't delete) input files",
355 " -l, --list list compressed file contents",
356 " -L, --license display software license",
358 " -m, --no-time do not save or restore the original modification time",
359 " -M, --time save or restore the original modification time",
361 " -n, --no-name do not save or restore the original name and time stamp",
362 " -N, --name save or restore the original name and time stamp",
363 " -q, --quiet suppress all warnings",
365 " -r, --recursive operate recursively on directories",
367 " --rsyncable make rsync-friendly archive",
368 " -S, --suffix=SUF use suffix SUF on compressed files",
369 " --synchronous synchronous output (safer if system crashes, but slower)",
370 " -t, --test test compressed file integrity",
371 " -v, --verbose verbose mode",
372 " -V, --version display version number",
373 " -1, --fast compress faster",
374 " -9, --best compress better",
376 " -Z, --lzw produce output compatible with old compress",
377 " -b, --bits=BITS max number of bits per code (implies -Z)",
380 "With no FILE, or when FILE is -, read standard input.",
382 "Report bugs to <bug-gzip@gnu.org>.",
384 char const *const *p = help_msg;
386 printf ("Usage: %s [OPTION]... [FILE]...\n", program_name);
387 while (*p) printf ("%s\n", *p++);
390 /* ======================================================================== */
393 char const *const *p = license_msg;
395 printf ("%s %s\n", program_name, Version);
396 while (*p) printf ("%s\n", *p++);
399 /* ======================================================================== */
404 printf ("Written by Jean-loup Gailly.\n");
407 local void progerror (char const *string)
410 fprintf (stderr, "%s: ", program_name);
416 /* ======================================================================== */
417 int main (int argc, char **argv)
419 int file_count; /* number of files to process */
420 size_t proglen; /* length of program_name */
425 EXPAND(argc, argv); /* wild card expansion if necessary */
427 program_name = gzip_base_name (argv[0]);
428 proglen = strlen (program_name);
430 atexit (close_stdin);
432 /* Suppress .exe for MSDOS, OS/2 and VMS: */
433 if (4 < proglen && strequ (program_name + proglen - 4, ".exe"))
434 program_name[proglen - 4] = '\0';
436 /* Add options in GZIP environment variable if there is one */
438 env = add_envopt (&env_argc, &argv_copy, OPTIONS_VAR);
439 env_argv = env ? argv_copy : NULL;
442 # define GNU_STANDARD 1
445 /* For compatibility with old compress, use program name as an option.
446 * Unless you compile with -DGNU_STANDARD=0, this program will behave as
447 * gzip even if it is invoked under the name gunzip or zcat.
449 * Systems which do not support links can still use -d or -dc.
450 * Ignore an .exe extension for MSDOS, OS/2 and VMS.
452 if (strncmp (program_name, "un", 2) == 0 /* ungzip, uncompress */
453 || strncmp (program_name, "gun", 3) == 0) /* gunzip */
455 else if (strequ (program_name + 1, "cat") /* zcat, pcat, gcat */
456 || strequ (program_name, "gzcat")) /* gzcat */
457 decompress = to_stdout = 1;
461 z_len = strlen(z_suffix);
469 if (env_argv[optind] && strequ (env_argv[optind], "--"))
470 optc = ENV_OPTION + '-';
473 optc = getopt_long (env_argc, env_argv, shortopts, longopts,
479 if (optind != env_argc)
482 ("%s: %s: non-option in "OPTIONS_VAR
483 " environment variable\n"),
484 program_name, env_argv[optind]);
488 /* Wait until here before warning, so that GZIP='-q'
490 if (env_argc != 1 && !quiet)
492 ("%s: warning: "OPTIONS_VAR" environment variable"
493 " is deprecated; use an alias or script\n"),
496 /* Start processing ARGC and ARGV instead. */
506 optc = getopt_long (argc, argv, shortopts, longopts, &longind);
514 maxbits = atoi(optarg);
515 for (; *optarg; optarg++)
516 if (! ('0' <= *optarg && *optarg <= '9'))
518 fprintf (stderr, "%s: -b operand is not an integer\n",
524 to_stdout = 1; break;
526 decompress = 1; break;
530 help(); do_exit(OK); break;
534 list = decompress = to_stdout = 1; break;
536 license(); do_exit(OK); break;
537 case 'm': /* undocumented, may change later */
539 case 'M': /* undocumented, may change later */
542 case 'n' + ENV_OPTION:
543 no_name = no_time = 1; break;
545 case 'N' + ENV_OPTION:
546 no_name = no_time = 0; break;
547 case PRESUME_INPUT_TTY_OPTION:
548 presume_input_tty = true; break;
550 case 'q' + ENV_OPTION:
551 quiet = 1; verbose = 0; break;
554 fprintf (stderr, "%s: -r not supported on this system\n",
562 case RSYNCABLE_OPTION:
563 case RSYNCABLE_OPTION + ENV_OPTION:
567 #ifdef NO_MULTIPLE_DOTS
568 if (*optarg == '.') optarg++;
570 z_len = strlen(optarg);
573 case SYNCHRONOUS_OPTION:
577 test = decompress = to_stdout = 1;
580 case 'v' + ENV_OPTION:
581 verbose++; quiet = 0; break;
583 version(); do_exit(OK); break;
588 fprintf(stderr, "%s: -Z not supported in this version\n",
593 case '1' + ENV_OPTION: case '2' + ENV_OPTION: case '3' + ENV_OPTION:
594 case '4' + ENV_OPTION: case '5' + ENV_OPTION: case '6' + ENV_OPTION:
595 case '7' + ENV_OPTION: case '8' + ENV_OPTION: case '9' + ENV_OPTION:
598 case '1': case '2': case '3': case '4':
599 case '5': case '6': case '7': case '8': case '9':
604 if (ENV_OPTION <= optc && optc != ENV_OPTION + '?')
606 /* Output a diagnostic, since getopt_long didn't. */
607 fprintf (stderr, "%s: ", program_name);
609 fprintf (stderr, "-%c: ", optc - ENV_OPTION);
611 fprintf (stderr, "--%s: ", longopts[longind].name);
612 fprintf (stderr, ("option not valid in "OPTIONS_VAR
613 " environment variable\n"));
617 } /* loop on all arguments */
619 /* By default, save name and timestamp on compression but do not
620 * restore them on decompression.
622 if (no_time < 0) no_time = decompress;
623 if (no_name < 0) no_name = decompress;
625 file_count = argc - optind;
629 if (ascii && !quiet) {
630 fprintf(stderr, "%s: option --ascii ignored on this system\n",
634 if (z_len == 0 || z_len > MAX_SUFFIX) {
635 fprintf(stderr, "%s: invalid suffix '%s'\n", program_name, z_suffix);
639 if (do_lzw && !decompress) work = lzw;
641 /* Allocate all global buffers (for DYN_ALLOC option) */
642 ALLOC(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
643 ALLOC(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
644 ALLOC(ush, d_buf, DIST_BUFSIZE);
645 ALLOC(uch, window, 2L*WSIZE);
647 ALLOC(ush, tab_prefix, 1L<<BITS);
649 ALLOC(ush, tab_prefix0, 1L<<(BITS-1));
650 ALLOC(ush, tab_prefix1, 1L<<(BITS-1));
653 exiting_signal = quiet ? SIGPIPE : 0;
654 install_signal_handlers ();
656 /* And get to work */
657 if (file_count != 0) {
658 if (to_stdout && !test && !list && (!decompress || !ascii)) {
659 SET_BINARY_MODE (STDOUT_FILENO);
661 while (optind < argc) {
662 treat_file(argv[optind++]);
664 } else { /* Standard input */
667 if (list && !quiet && file_count > 1) {
668 do_list(-1, -1); /* print totals */
672 && (fdatasync (STDOUT_FILENO) != 0 && errno != EINVAL))
673 || close (STDOUT_FILENO) != 0)
677 return exit_code; /* just to avoid lint warning */
680 /* Return nonzero when at end of file on input. */
684 if (!decompress || last_member)
689 if (insize != INBUFSIZ || fill_inbuf (1) == EOF)
692 /* Unget the char that fill_inbuf got. */
699 /* ========================================================================
700 * Compress or decompress stdin
702 local void treat_stdin()
705 && (presume_input_tty
706 || isatty (decompress ? STDIN_FILENO : STDOUT_FILENO))) {
707 /* Do not send compressed data to the terminal or read it from
708 * the terminal. We get here when user invoked the program
709 * without parameters, so be helpful. According to the GNU standards:
711 * If there is one behavior you think is most useful when the output
712 * is to a terminal, and another that you think is most useful when
713 * the output is a file or a pipe, then it is usually best to make
714 * the default behavior the one that is useful with output to a
715 * terminal, and have an option for the other behavior.
717 * Here we use the --force option to get the other behavior.
721 ("%s: compressed data not %s a terminal."
722 " Use -f to force %scompression.\n"
723 "For help, type: %s -h\n"),
725 decompress ? "read from" : "written to",
726 decompress ? "de" : "",
731 if (decompress || !ascii) {
732 SET_BINARY_MODE (STDIN_FILENO);
734 if (!test && !list && (!decompress || !ascii)) {
735 SET_BINARY_MODE (STDOUT_FILENO);
737 strcpy(ifname, "stdin");
738 strcpy(ofname, "stdout");
740 /* Get the file's time stamp and size. */
741 if (fstat (STDIN_FILENO, &istat) != 0)
743 progerror ("standard input");
746 ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1;
747 time_stamp.tv_nsec = -1;
748 if (!no_time || list)
750 if (S_ISREG (istat.st_mode))
751 time_stamp = get_stat_mtime (&istat);
753 gettime (&time_stamp);
756 clear_bufs(); /* clear input and output buffers */
762 method = get_method(ifd);
764 do_exit(exit_code); /* error message already emitted */
768 do_list(ifd, method);
772 /* Actually do the compression/decompression. Loop over zipped members.
775 if (work (STDIN_FILENO, STDOUT_FILENO) != OK)
781 method = get_method(ifd);
782 if (method < 0) return; /* error message already emitted */
783 bytes_out = 0; /* required for length check */
788 fprintf(stderr, " OK\n");
790 } else if (!decompress) {
791 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
792 fprintf(stderr, "\n");
793 #ifdef DISPLAY_STDIN_RATIO
795 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
796 fprintf(stderr, "\n");
802 static char const dot = '.';
804 /* True if the cached directory for calls to openat etc. is DIR, with
805 length DIRLEN. DIR need not be null-terminated. DIRLEN must be
806 less than MAX_PATH_LEN. */
808 atdir_eq (char const *dir, ptrdiff_t dirlen)
811 dir = &dot, dirlen = 1;
812 return memcmp (dfname, dir, dirlen) == 0 && !dfname[dirlen];
815 /* Set the directory used for calls to openat etc. to be the directory
816 DIR, with length DIRLEN. DIR need not be null-terminated.
817 DIRLEN must be less than MAX_PATH_LEN. Return a file descriptor for
818 the directory, or -1 if one could not be obtained. */
820 atdir_set (char const *dir, ptrdiff_t dirlen)
822 /* Don't bother opening directories on older systems that
823 lack openat and unlinkat. It's not worth the porting hassle. */
824 #if HAVE_OPENAT && HAVE_UNLINKAT
825 enum { try_opening_directories = true };
827 enum { try_opening_directories = false };
830 if (try_opening_directories && ! atdir_eq (dir, dirlen))
835 dir = &dot, dirlen = 1;
836 memcpy (dfname, dir, dirlen);
837 dfname[dirlen] = '\0';
838 dfd = open (dfname, O_SEARCH | O_DIRECTORY);
844 /* ========================================================================
845 * Compress or decompress the given file
847 local void treat_file(iname)
850 /* Accept "-" as synonym for stdin */
851 if (strequ(iname, "-")) {
852 int cflag = to_stdout;
858 /* Check if the input file is present, set ifname and istat: */
859 ifd = open_input_file (iname, &istat);
863 /* If the input name is that of a directory, recurse or ignore: */
864 if (S_ISDIR(istat.st_mode)) {
867 treat_dir (ifd, iname);
868 /* Warning: ifname is now garbage */
873 WARN ((stderr, "%s: %s is a directory -- ignored\n",
874 program_name, ifname));
880 if (! S_ISREG (istat.st_mode))
883 "%s: %s is not a directory or a regular file - ignored\n",
884 program_name, ifname));
888 if (istat.st_mode & S_ISUID)
890 WARN ((stderr, "%s: %s is set-user-ID on execution - ignored\n",
891 program_name, ifname));
895 if (istat.st_mode & S_ISGID)
897 WARN ((stderr, "%s: %s is set-group-ID on execution - ignored\n",
898 program_name, ifname));
905 if (istat.st_mode & S_ISVTX)
908 "%s: %s has the sticky bit set - file ignored\n",
909 program_name, ifname));
913 if (2 <= istat.st_nlink)
915 WARN ((stderr, "%s: %s has %lu other link%c -- unchanged\n",
916 program_name, ifname,
917 (unsigned long int) istat.st_nlink - 1,
918 istat.st_nlink == 2 ? ' ' : 's'));
925 ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1;
926 time_stamp.tv_nsec = -1;
927 if (!no_time || list)
928 time_stamp = get_stat_mtime (&istat);
930 /* Generate output file name. For -r and (-t or -l), skip files
931 * without a valid gzip suffix (check done in make_ofname).
933 if (to_stdout && !list && !test) {
934 strcpy(ofname, "stdout");
936 } else if (make_ofname() != OK) {
941 clear_bufs(); /* clear input and output buffers */
945 method = get_method(ifd); /* updates ofname if original given */
948 return; /* error message already emitted */
952 do_list(ifd, method);
953 if (close (ifd) != 0)
958 /* If compressing to a file, check if ofname is not ambiguous
959 * because the operating system truncates names. Otherwise, generate
960 * a new ofname and save the original name in the compressed file.
964 /* Keep remove_ofname_fd negative. */
966 if (create_outfile() != OK) return;
968 if (!decompress && save_orig_name && !verbose && !quiet) {
969 fprintf(stderr, "%s: %s compressed to %s\n",
970 program_name, ifname, ofname);
973 /* Keep the name even if not truncated except with --no-name: */
974 if (!save_orig_name) save_orig_name = !no_name;
977 fprintf(stderr, "%s:\t", ifname);
980 /* Actually do the compression/decompression. Loop over zipped members.
983 if ((*work)(ifd, ofd) != OK) {
984 method = -1; /* force cleanup */
991 method = get_method(ifd);
992 if (method < 0) break; /* error message already emitted */
993 bytes_out = 0; /* required for length check */
996 if (close (ifd) != 0)
1004 && ((0 <= dfd && fdatasync (dfd) != 0 && errno != EINVAL)
1005 || (fsync (ofd) != 0 && errno != EINVAL)))
1006 || close (ofd) != 0)
1013 char *ifbase = last_component (ifname);
1014 int ufd = atdir_eq (ifname, ifbase - ifname) ? dfd : -1;
1017 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
1018 remove_ofname_fd = -1;
1019 res = ufd < 0 ? xunlink (ifname) : unlinkat (ufd, ifbase, 0);
1020 unlink_errno = res == 0 ? 0 : errno;
1021 sigprocmask (SIG_SETMASK, &oldset, NULL);
1025 WARN ((stderr, "%s: ", program_name));
1028 errno = unlink_errno;
1037 remove_output_file ();
1041 /* Display statistics */
1044 fprintf(stderr, " OK");
1045 } else if (decompress) {
1046 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
1048 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
1050 if (!test && !to_stdout)
1051 fprintf(stderr, " -- %s %s", keep ? "created" : "replaced with",
1053 fprintf(stderr, "\n");
1057 /* ========================================================================
1058 * Create the output file. Return OK or ERROR.
1059 * Try several times if necessary to avoid truncating the z_suffix. For
1060 * example, do not create a compressed file of name "1234567890123."
1061 * Sets save_orig_name to true if the file name has been truncated.
1062 * IN assertions: the input file has already been open (ifd is set) and
1063 * ofname has already been updated if there was an original name.
1064 * OUT assertions: ifd and ofd are closed in case of error.
1066 local int create_outfile()
1068 int name_shortened = 0;
1069 int flags = (O_WRONLY | O_CREAT | O_EXCL
1070 | (ascii && decompress ? 0 : O_BINARY));
1071 char const *base = ofname;
1072 int atfd = AT_FDCWD;
1076 char const *b = last_component (ofname);
1077 int f = atdir_set (ofname, b - ofname);
1090 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
1091 remove_ofname_fd = ofd = openat (atfd, base, flags, S_IRUSR | S_IWUSR);
1093 sigprocmask (SIG_SETMASK, &oldset, NULL);
1102 shorten_name (ofname);
1108 if (check_ofname () != OK)
1122 if (name_shortened && decompress)
1124 /* name might be too long if an original name was saved */
1125 WARN ((stderr, "%s: %s: warning, name truncated\n",
1126 program_name, ofname));
1132 /* ========================================================================
1133 * Return a pointer to the 'z' suffix of a file name, or NULL. For all
1134 * systems, ".gz", ".z", ".Z", ".taz", ".tgz", "-gz", "-z" and "_z" are
1135 * accepted suffixes, in addition to the value of the --suffix option.
1136 * ".tgz" is a useful convention for tar.z files on systems limited
1137 * to 3 characters extensions. On such systems, ".?z" and ".??z" are
1138 * also accepted suffixes. For Unix, we do not want to accept any
1139 * .??z suffix as indicating a compressed file; some people use .xyz
1140 * to denote volume data.
1141 * On systems allowing multiple versions of the same file (such as VMS),
1142 * this function removes any version suffix in the given name.
1144 local char *get_suffix(name)
1148 char suffix[MAX_SUFFIX+3]; /* last chars of name, forced to lower case */
1149 static char const *known_suffixes[] =
1150 {NULL, ".gz", ".z", ".taz", ".tgz", "-gz", "-z", "_z",
1151 #ifdef MAX_EXT_CHARS
1156 bool suffix_of_builtin = false;
1158 /* Normally put Z_SUFFIX at the start of KNOWN_SUFFIXES, but if it
1159 is a suffix of one of them, put it at the end. */
1160 for (suf = known_suffixes + 1; *suf; suf++)
1162 size_t suflen = strlen (*suf);
1163 if (z_len < suflen && strequ (z_suffix, *suf + suflen - z_len))
1165 suffix_of_builtin = true;
1169 known_suffixes[suffix_of_builtin
1170 ? sizeof known_suffixes / sizeof *known_suffixes - 2
1172 suf = known_suffixes + suffix_of_builtin;
1175 /* strip a version number from the file name */
1177 char *v = strrchr(name, SUFFIX_SEP);
1178 if (v != NULL) *v = '\0';
1181 nlen = strlen(name);
1182 if (nlen <= MAX_SUFFIX+2) {
1183 strcpy(suffix, name);
1185 strcpy(suffix, name+nlen-MAX_SUFFIX-2);
1188 slen = strlen(suffix);
1190 int s = strlen(*suf);
1191 if (slen > s && suffix[slen-s-1] != PATH_SEP
1192 && strequ(suffix + slen - s, *suf)) {
1195 } while (*++suf != NULL);
1201 /* Open file NAME with the given flags and store its status
1202 into *ST. Return a file descriptor to the newly opened file, or -1
1203 (setting errno) on failure. */
1205 open_and_stat (char *name, int flags, struct stat *st)
1208 int atfd = AT_FDCWD;
1209 char const *base = name;
1211 /* Refuse to follow symbolic links unless -c or -f. */
1212 if (!to_stdout && !force)
1214 if (HAVE_WORKING_O_NOFOLLOW)
1215 flags |= O_NOFOLLOW;
1218 #if HAVE_LSTAT || defined lstat
1219 if (lstat (name, st) != 0)
1221 else if (S_ISLNK (st->st_mode))
1232 char const *b = last_component (name);
1233 int f = atdir_set (name, b - name);
1241 fd = openat (atfd, base, flags);
1242 if (0 <= fd && fstat (fd, st) != 0)
1253 /* ========================================================================
1254 * Set ifname to the input file name (with a suffix appended if necessary)
1255 * and istat to its stats. For decompression, if no file exists with the
1256 * original name, try adding successively z_suffix, .gz, .z, -z and .Z.
1257 * For MSDOS, we try only z_suffix and z.
1258 * Return an open file descriptor or -1.
1261 open_input_file (iname, sbuf)
1265 int ilen; /* strlen(ifname) */
1266 int z_suffix_errno = 0;
1267 static char const *suffixes[] = {NULL, ".gz", ".z", "-z", ".Z", NULL};
1268 char const **suf = suffixes;
1270 #ifdef NO_MULTIPLE_DOTS
1271 char *dot; /* pointer to ifname extension, or NULL */
1274 int open_flags = (O_RDONLY | O_NONBLOCK | O_NOCTTY
1275 | (ascii && !decompress ? 0 : O_BINARY));
1279 if (sizeof ifname - 1 <= strlen (iname))
1282 strcpy(ifname, iname);
1284 /* If input file exists, return OK. */
1285 fd = open_and_stat (ifname, open_flags, sbuf);
1289 if (!decompress || errno != ENOENT) {
1293 /* file.ext doesn't exist, try adding a suffix (after removing any
1294 * version number for VMS).
1296 s = get_suffix(ifname);
1298 progerror(ifname); /* ifname already has z suffix and does not exist */
1301 #ifdef NO_MULTIPLE_DOTS
1302 dot = strrchr(ifname, '.');
1304 strcat(ifname, ".");
1305 dot = strrchr(ifname, '.');
1308 ilen = strlen(ifname);
1309 if (strequ(z_suffix, ".gz")) suf++;
1311 /* Search for all suffixes */
1313 char const *s0 = s = *suf;
1314 strcpy (ifname, iname);
1315 #ifdef NO_MULTIPLE_DOTS
1317 if (*dot == '\0') strcpy (dot, ".");
1319 #ifdef MAX_EXT_CHARS
1320 if (MAX_EXT_CHARS < strlen (s) + strlen (dot + 1))
1321 dot[MAX_EXT_CHARS + 1 - strlen (s)] = '\0';
1323 if (sizeof ifname <= ilen + strlen (s))
1326 fd = open_and_stat (ifname, open_flags, sbuf);
1329 if (errno != ENOENT)
1334 if (strequ (s0, z_suffix))
1335 z_suffix_errno = errno;
1336 } while (*++suf != NULL);
1338 /* No suffix found, complain using z_suffix: */
1339 strcpy(ifname, iname);
1340 #ifdef NO_MULTIPLE_DOTS
1341 if (*dot == '\0') strcpy(dot, ".");
1343 #ifdef MAX_EXT_CHARS
1344 if (MAX_EXT_CHARS < z_len + strlen (dot + 1))
1345 dot[MAX_EXT_CHARS + 1 - z_len] = '\0';
1347 strcat(ifname, z_suffix);
1348 errno = z_suffix_errno;
1353 fprintf (stderr, "%s: %s: file name too long\n", program_name, iname);
1358 /* ========================================================================
1359 * Generate ofname given ifname. Return OK, or WARNING if file must be skipped.
1360 * Sets save_orig_name to true if the file name has been truncated.
1362 local int make_ofname()
1364 char *suff; /* ofname z suffix */
1366 strcpy(ofname, ifname);
1367 /* strip a version number if any and get the gzip suffix if present: */
1368 suff = get_suffix(ofname);
1372 /* With -t or -l, try all files (even without .gz suffix)
1373 * except with -r (behave as with just -dr).
1375 if (!recursive && (list || test)) return OK;
1377 /* Avoid annoying messages with -r */
1378 if (verbose || (!recursive && !quiet)) {
1379 WARN((stderr,"%s: %s: unknown suffix -- ignored\n",
1380 program_name, ifname));
1384 /* Make a special case for .tgz and .taz: */
1386 if (strequ(suff, ".tgz") || strequ(suff, ".taz")) {
1387 strcpy(suff, ".tar");
1389 *suff = '\0'; /* strip the z suffix */
1391 /* ofname might be changed later if infile contains an original name */
1393 } else if (suff && ! force) {
1394 /* Avoid annoying messages with -r (see treat_dir()) */
1395 if (verbose || (!recursive && !quiet)) {
1396 /* Don't use WARN, as it affects exit status. */
1397 fprintf (stderr, "%s: %s already has %s suffix -- unchanged\n",
1398 program_name, ifname, suff);
1404 #ifdef NO_MULTIPLE_DOTS
1405 suff = strrchr(ofname, '.');
1407 if (sizeof ofname <= strlen (ofname) + 1)
1409 strcat(ofname, ".");
1410 # ifdef MAX_EXT_CHARS
1411 if (strequ(z_suffix, "z")) {
1412 if (sizeof ofname <= strlen (ofname) + 2)
1414 strcat(ofname, "gz"); /* enough room */
1417 /* On the Atari and some versions of MSDOS,
1418 * ENAMETOOLONG does not work correctly. So we
1419 * must truncate here.
1421 } else if (strlen(suff)-1 + z_len > MAX_SUFFIX) {
1422 suff[MAX_SUFFIX+1-z_len] = '\0';
1426 #endif /* NO_MULTIPLE_DOTS */
1427 if (sizeof ofname <= strlen (ofname) + z_len)
1429 strcat(ofname, z_suffix);
1431 } /* decompress ? */
1435 WARN ((stderr, "%s: %s: file name too long\n", program_name, ifname));
1439 /* Discard NBYTES input bytes from the input, or up through the next
1440 zero byte if NBYTES == (size_t) -1. If FLAGS say that the header
1441 CRC should be computed, update the CRC accordingly. */
1443 discard_input_bytes (nbytes, flags)
1449 uch c = get_byte ();
1450 if (flags & HEADER_CRC)
1452 if (nbytes != (size_t) -1)
1459 /* ========================================================================
1460 * Check the magic number of the input file and update ofname if an
1461 * original name was given and to_stdout is not set.
1462 * Return the compression method, -1 for error, -2 for warning.
1463 * Set inptr to the offset of the next byte to be processed.
1464 * Updates time_stamp if there is one and --no-time is not used.
1465 * This function may be called repeatedly for an input file consisting
1466 * of several contiguous gzip'ed members.
1467 * IN assertions: there is at least one remaining compressed member.
1468 * If the member is a zip file, it must be the only one.
1470 local int get_method(in)
1471 int in; /* input file descriptor */
1473 uch flags; /* compression flags */
1474 uch magic[10]; /* magic header */
1475 int imagic0; /* first magic byte or EOF */
1476 int imagic1; /* like magic[1], but can represent EOF */
1477 ulg stamp; /* time stamp */
1479 /* If --force and --stdout, zcat == cat, so do not complain about
1480 * premature end of file: use try_byte instead of get_byte.
1482 if (force && to_stdout) {
1483 imagic0 = try_byte();
1485 imagic1 = try_byte ();
1487 /* If try_byte returned EOF, magic[1] == (char) EOF. */
1489 magic[0] = get_byte ();
1492 magic[1] = get_byte ();
1493 imagic1 = 0; /* avoid lint warning */
1495 imagic1 = try_byte ();
1499 method = -1; /* unknown yet */
1500 part_nb++; /* number of parts in gzip file */
1502 last_member = RECORD_IO;
1503 /* assume multiple members in gzip file except for record oriented I/O */
1505 if (memcmp(magic, GZIP_MAGIC, 2) == 0
1506 || memcmp(magic, OLD_GZIP_MAGIC, 2) == 0) {
1508 method = (int)get_byte();
1509 if (method != DEFLATED) {
1511 "%s: %s: unknown method %d -- not supported\n",
1512 program_name, ifname, method);
1517 flags = (uch)get_byte();
1519 if ((flags & ENCRYPTED) != 0) {
1521 "%s: %s is encrypted -- not supported\n",
1522 program_name, ifname);
1526 if ((flags & RESERVED) != 0) {
1528 "%s: %s has flags 0x%x -- not supported\n",
1529 program_name, ifname, flags);
1531 if (force <= 1) return -1;
1533 stamp = (ulg)get_byte();
1534 stamp |= ((ulg)get_byte()) << 8;
1535 stamp |= ((ulg)get_byte()) << 16;
1536 stamp |= ((ulg)get_byte()) << 24;
1537 if (stamp != 0 && !no_time)
1539 time_stamp.tv_sec = stamp;
1540 time_stamp.tv_nsec = 0;
1543 magic[8] = get_byte (); /* Ignore extra flags. */
1544 magic[9] = get_byte (); /* Ignore OS type. */
1546 if (flags & HEADER_CRC)
1548 magic[2] = DEFLATED;
1550 magic[4] = stamp & 0xff;
1551 magic[5] = (stamp >> 8) & 0xff;
1552 magic[6] = (stamp >> 16) & 0xff;
1553 magic[7] = stamp >> 24;
1558 if ((flags & EXTRA_FIELD) != 0) {
1560 unsigned int len = lenbuf[0] = get_byte ();
1561 len |= (lenbuf[1] = get_byte ()) << 8;
1563 fprintf(stderr,"%s: %s: extra field of %u bytes ignored\n",
1564 program_name, ifname, len);
1566 if (flags & HEADER_CRC)
1568 discard_input_bytes (len, flags);
1571 /* Get original file name if it was truncated */
1572 if ((flags & ORIG_NAME) != 0) {
1573 if (no_name || (to_stdout && !list) || part_nb > 1) {
1574 /* Discard the old name */
1575 discard_input_bytes (-1, flags);
1577 /* Copy the base name. Keep a directory prefix intact. */
1578 char *p = gzip_base_name (ofname);
1581 *p = (char) get_byte ();
1582 if (*p++ == '\0') break;
1583 if (p >= ofname+sizeof(ofname)) {
1584 gzip_error ("corrupted input -- file name too large");
1587 if (flags & HEADER_CRC)
1588 updcrc ((uch *) base, p - base);
1589 p = gzip_base_name (base);
1590 memmove (base, p, strlen (p) + 1);
1591 /* If necessary, adapt the name to local OS conventions: */
1593 MAKE_LEGAL_NAME(base);
1594 if (base) list=0; /* avoid warning about unused variable */
1596 } /* no_name || to_stdout */
1599 /* Discard file comment if any */
1600 if ((flags & COMMENT) != 0) {
1601 discard_input_bytes (-1, flags);
1604 if (flags & HEADER_CRC)
1606 unsigned int crc16 = updcrc (magic, 0) & 0xffff;
1607 unsigned int header16 = get_byte ();
1608 header16 |= ((unsigned int) get_byte ()) << 8;
1609 if (header16 != crc16)
1612 "%s: %s: header checksum 0x%04x != computed checksum 0x%04x\n",
1613 program_name, ifname, header16, crc16);
1621 header_bytes = inptr + 2*4; /* include crc and size */
1624 } else if (memcmp(magic, PKZIP_MAGIC, 2) == 0 && inptr == 2
1625 && memcmp((char*)inbuf, PKZIP_MAGIC, 4) == 0) {
1626 /* To simplify the code, we support a zip file when alone only.
1627 * We are thus guaranteed that the entire local header fits in inbuf.
1631 if (check_zipfile(in) != OK) return -1;
1632 /* check_zipfile may get ofname from the local header */
1635 } else if (memcmp(magic, PACK_MAGIC, 2) == 0) {
1639 } else if (memcmp(magic, LZW_MAGIC, 2) == 0) {
1641 method = COMPRESSED;
1644 } else if (memcmp(magic, LZH_MAGIC, 2) == 0) {
1649 } else if (force && to_stdout && !list) { /* pass input unchanged */
1655 if (imagic0 != EOF) {
1656 write_buf (STDOUT_FILENO, magic, 1);
1660 if (method >= 0) return method;
1663 fprintf (stderr, "\n%s: %s: not in gzip format\n",
1664 program_name, ifname);
1671 for (inbyte = imagic1; inbyte == 0; inbyte = try_byte ())
1676 WARN ((stderr, "\n%s: %s: decompression OK, trailing zero bytes ignored\n",
1677 program_name, ifname));
1682 WARN((stderr, "\n%s: %s: decompression OK, trailing garbage ignored\n",
1683 program_name, ifname));
1688 /* ========================================================================
1689 * Display the characteristics of the compressed file.
1690 * If the given method is < 0, display the accumulated totals.
1691 * IN assertions: time_stamp, header_bytes and ifile_size are initialized.
1693 local void do_list(ifd, method)
1694 int ifd; /* input file descriptor */
1695 int method; /* compression method */
1697 ulg crc; /* original crc */
1698 static int first_time = 1;
1699 static char const *const methods[MAX_METHODS] = {
1704 "", "", "", "", /* 4 to 7 reserved */
1706 int positive_off_t_width = 1;
1709 for (o = OFF_T_MAX; 9 < o; o /= 10) {
1710 positive_off_t_width++;
1713 if (first_time && method >= 0) {
1716 printf("method crc date time ");
1719 printf("%*.*s %*.*s ratio uncompressed_name\n",
1720 positive_off_t_width, positive_off_t_width, "compressed",
1721 positive_off_t_width, positive_off_t_width, "uncompressed");
1723 } else if (method < 0) {
1724 if (total_in <= 0 || total_out <= 0) return;
1728 if (verbose || !quiet) {
1729 fprint_off(stdout, total_in, positive_off_t_width);
1731 fprint_off(stdout, total_out, positive_off_t_width);
1734 display_ratio(total_out-(total_in-header_bytes), total_out, stdout);
1735 /* header_bytes is not meaningful but used to ensure the same
1736 * ratio if there is a single file.
1738 printf(" (totals)\n");
1741 crc = (ulg)~0; /* unknown */
1743 bytes_in = ifile_size;
1745 if (!RECORD_IO && method == DEFLATED && !last_member) {
1746 /* Get the crc and uncompressed size for gzip'ed (not zip'ed) files.
1747 * If the lseek fails, we could use read() to get to the end, but
1748 * --list is used to get quick results.
1749 * Use "gunzip < foo.gz | wc -c" to get the uncompressed size if
1750 * you are not concerned about speed.
1752 bytes_in = lseek(ifd, (off_t)(-8), SEEK_END);
1753 if (bytes_in != -1L) {
1756 if (read(ifd, (char*)buf, sizeof(buf)) != sizeof(buf)) {
1760 bytes_out = LG(buf+4);
1766 static char const month_abbr[][4]
1767 = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
1768 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
1769 struct tm *tm = localtime (&time_stamp.tv_sec);
1770 printf ("%5s %08lx ", methods[method], crc);
1772 printf ("%s%3d %02d:%02d ", month_abbr[tm->tm_mon],
1773 tm->tm_mday, tm->tm_hour, tm->tm_min);
1775 printf ("??? ?? ??:?? ");
1777 fprint_off(stdout, bytes_in, positive_off_t_width);
1779 fprint_off(stdout, bytes_out, positive_off_t_width);
1781 if (bytes_in == -1L) {
1783 bytes_in = bytes_out = header_bytes = 0;
1784 } else if (total_in >= 0) {
1785 total_in += bytes_in;
1787 if (bytes_out == -1L) {
1789 bytes_in = bytes_out = header_bytes = 0;
1790 } else if (total_out >= 0) {
1791 total_out += bytes_out;
1793 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out, stdout);
1794 printf(" %s\n", ofname);
1797 /* ========================================================================
1798 * Shorten the given name by one character, or replace a .tar extension
1799 * with .tgz. Truncate the last part of the name which is longer than
1800 * MIN_PART characters: 1234.678.012.gz -> 123.678.012.gz. If the name
1801 * has only parts shorter than MIN_PART truncate the longest part.
1802 * For decompression, just remove the last character of the name.
1804 * IN assertion: for compression, the suffix of the given name is z_suffix.
1806 local void shorten_name(name)
1809 int len; /* length of name without z_suffix */
1810 char *trunc = NULL; /* character to be truncated */
1811 int plen; /* current part length */
1812 int min_part = MIN_PART; /* current minimum part length */
1818 gzip_error ("name too short");
1822 p = get_suffix(name);
1824 gzip_error ("can't recover suffix\n");
1828 /* compress 1234567890.tar to 1234567890.tgz */
1829 if (len > 4 && strequ(p-4, ".tar")) {
1830 strcpy(p-4, ".tgz");
1833 /* Try keeping short extensions intact:
1834 * 1234.678.012.gz -> 123.678.012.gz
1837 p = strrchr(name, PATH_SEP);
1840 plen = strcspn(p, PART_SEP);
1842 if (plen > min_part) trunc = p-1;
1845 } while (trunc == NULL && --min_part != 0);
1847 if (trunc != NULL) {
1849 trunc[0] = trunc[1];
1853 trunc = strrchr(name, PART_SEP[0]);
1855 gzip_error ("internal error in shorten_name");
1856 if (trunc[1] == '\0') trunc--; /* force truncation */
1858 strcpy(trunc, z_suffix);
1861 /* ========================================================================
1862 * The compressed file already exists, so ask for confirmation.
1863 * Return ERROR if the file must be skipped.
1865 local int check_ofname()
1867 /* Ask permission to overwrite the existing file */
1870 fprintf (stderr, "%s: %s already exists;", program_name, ofname);
1871 if (foreground && (presume_input_tty || isatty (STDIN_FILENO))) {
1872 fprintf(stderr, " do you wish to overwrite (y or n)? ");
1877 fprintf(stderr, "\tnot overwritten\n");
1878 if (exit_code == OK) exit_code = WARNING;
1882 if (xunlink (ofname)) {
1889 /* Change the owner and group of a file. FD is a file descriptor for
1890 the file and NAME its name. Change it to user UID and to group GID.
1891 If UID or GID is -1, though, do not change the corresponding user
1894 do_chown (int fd, char const *name, uid_t uid, gid_t gid)
1898 ignore_value (fchown (fd, uid, gid));
1900 ignore_value (chown (name, uid, gid));
1905 /* ========================================================================
1906 * Copy modes, times, ownership from input file to output file.
1907 * IN assertion: to_stdout is false.
1909 local void copy_stat(ifstat)
1910 struct stat *ifstat;
1912 mode_t mode = ifstat->st_mode & S_IRWXUGO;
1916 struct timespec timespec[2];
1917 timespec[0] = get_stat_atime (ifstat);
1918 timespec[1] = get_stat_mtime (ifstat);
1920 if (decompress && 0 <= time_stamp.tv_nsec
1921 && ! (timespec[1].tv_sec == time_stamp.tv_sec
1922 && timespec[1].tv_nsec == time_stamp.tv_nsec))
1924 timespec[1] = time_stamp;
1926 fprintf(stderr, "%s: time stamp restored\n", ofname);
1930 if (fdutimens (ofd, ofname, timespec) != 0)
1933 WARN ((stderr, "%s: ", program_name));
1942 /* Change the group first, then the permissions, then the owner.
1943 That way, the permissions will be correct on systems that allow
1944 users to give away files, without introducing a security hole.
1945 Security depends on permissions not containing the setuid or
1948 do_chown (ofd, ofname, -1, ifstat->st_gid);
1951 r = fchmod (ofd, mode);
1953 r = chmod (ofname, mode);
1957 WARN ((stderr, "%s: ", program_name));
1964 do_chown (ofd, ofname, ifstat->st_uid, -1);
1969 /* ========================================================================
1970 * Recurse through the given directory.
1972 local void treat_dir (fd, dir)
1977 char nbuf[MAX_PATH_LEN];
1982 dirp = fdopendir (fd);
1990 entries = streamsavedir (dirp, SAVEDIR_SORT_NONE);
1993 if (closedir (dirp) != 0)
1998 for (entry = entries; *entry; entry += entrylen + 1) {
1999 size_t len = strlen (dir);
2000 entrylen = strlen (entry);
2001 if (strequ (entry, ".") || strequ (entry, ".."))
2003 if (len + entrylen < MAX_PATH_LEN - 2) {
2005 if (len != 0 /* dir = "" means current dir on Amiga */
2007 && dir[len-1] != PATH_SEP2
2010 && dir[len-1] != PATH_SEP3
2013 nbuf[len++] = PATH_SEP;
2015 strcpy (nbuf + len, entry);
2018 fprintf(stderr,"%s: %s/%s: pathname too long\n",
2019 program_name, dir, entry);
2025 #endif /* ! NO_DIR */
2027 /* Make sure signals get handled properly. */
2030 install_signal_handlers ()
2032 int nsigs = sizeof handled_sig / sizeof handled_sig[0];
2036 struct sigaction act;
2038 sigemptyset (&caught_signals);
2039 for (i = 0; i < nsigs; i++)
2041 sigaction (handled_sig[i], NULL, &act);
2042 if (act.sa_handler != SIG_IGN)
2043 sigaddset (&caught_signals, handled_sig[i]);
2046 act.sa_handler = abort_gzip_signal;
2047 act.sa_mask = caught_signals;
2050 for (i = 0; i < nsigs; i++)
2051 if (sigismember (&caught_signals, handled_sig[i]))
2055 sigaction (handled_sig[i], &act, NULL);
2058 for (i = 0; i < nsigs; i++)
2059 if (signal (handled_sig[i], SIG_IGN) != SIG_IGN)
2063 signal (handled_sig[i], abort_gzip_signal);
2064 siginterrupt (handled_sig[i], 1);
2069 /* ========================================================================
2070 * Free all dynamically allocated variables and exit with the given code.
2072 local void do_exit(exitcode)
2075 static int in_exit = 0;
2077 if (in_exit) exit(exitcode);
2094 /* ========================================================================
2095 * Close and unlink the output file.
2098 remove_output_file ()
2103 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
2104 fd = remove_ofname_fd;
2107 remove_ofname_fd = -1;
2111 sigprocmask (SIG_SETMASK, &oldset, NULL);
2114 /* ========================================================================
2120 remove_output_file ();
2124 /* ========================================================================
2128 abort_gzip_signal (sig)
2132 signal (sig, SIG_IGN);
2133 remove_output_file ();
2134 if (sig == exiting_signal)
2136 signal (sig, SIG_DFL);