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.
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 static bool stdin_was_read;
211 off_t bytes_in; /* number of input bytes */
212 off_t bytes_out; /* number of output bytes */
213 static off_t total_in; /* input bytes for all files */
214 static off_t total_out; /* output bytes for all files */
215 char ifname[MAX_PATH_LEN]; /* input file name */
216 char ofname[MAX_PATH_LEN]; /* output file name */
217 static char dfname[MAX_PATH_LEN]; /* name of dir containing output file */
218 static struct stat istat; /* status for input file */
219 int ifd; /* input file descriptor */
220 int ofd; /* output file descriptor */
221 static int dfd = -1; /* output directory file descriptor */
222 unsigned insize; /* valid bytes in inbuf */
223 unsigned inptr; /* index of next byte to be processed in inbuf */
224 unsigned outcnt; /* bytes in output buffer */
225 int rsync = 0; /* make ryncable chunks */
227 static int handled_sig[] =
229 /* SIGINT must be first, as 'foreground' depends on it. */
249 /* For long options that have no equivalent short option, use a
250 non-character as a pseudo short option, starting with CHAR_MAX + 1. */
253 PRESUME_INPUT_TTY_OPTION = CHAR_MAX + 1,
257 /* A value greater than all valid long options, used as a flag to
258 distinguish options derived from the GZIP environment variable. */
262 static char const shortopts[] = "ab:cdfhH?klLmMnNqrS:tvVZ123456789";
264 static const struct option longopts[] =
266 /* { name has_arg *flag val } */
267 {"ascii", 0, 0, 'a'}, /* ascii text mode */
268 {"to-stdout", 0, 0, 'c'}, /* write output on standard output */
269 {"stdout", 0, 0, 'c'}, /* write output on standard output */
270 {"decompress", 0, 0, 'd'}, /* decompress */
271 {"uncompress", 0, 0, 'd'}, /* decompress */
272 /* {"encrypt", 0, 0, 'e'}, encrypt */
273 {"force", 0, 0, 'f'}, /* force overwrite of output file */
274 {"help", 0, 0, 'h'}, /* give help */
275 /* {"pkzip", 0, 0, 'k'}, force output in pkzip format */
276 {"keep", 0, 0, 'k'}, /* keep (don't delete) input files */
277 {"list", 0, 0, 'l'}, /* list .gz file contents */
278 {"license", 0, 0, 'L'}, /* display software license */
279 {"no-name", 0, 0, 'n'}, /* don't save or restore original name & time */
280 {"name", 0, 0, 'N'}, /* save or restore original name & time */
281 {"-presume-input-tty", no_argument, NULL, PRESUME_INPUT_TTY_OPTION},
282 {"quiet", 0, 0, 'q'}, /* quiet mode */
283 {"silent", 0, 0, 'q'}, /* quiet mode */
284 {"synchronous",0, 0, SYNCHRONOUS_OPTION},
285 {"recursive", 0, 0, 'r'}, /* recurse through directories */
286 {"suffix", 1, 0, 'S'}, /* use given suffix instead of .gz */
287 {"test", 0, 0, 't'}, /* test compressed file integrity */
288 {"verbose", 0, 0, 'v'}, /* verbose mode */
289 {"version", 0, 0, 'V'}, /* display version number */
290 {"fast", 0, 0, '1'}, /* compress faster */
291 {"best", 0, 0, '9'}, /* compress better */
292 {"lzw", 0, 0, 'Z'}, /* make output compatible with old compress */
293 {"bits", 1, 0, 'b'}, /* max number of bits per code (implies -Z) */
294 {"rsyncable", 0, 0, RSYNCABLE_OPTION}, /* make rsync-friendly archive */
298 /* local functions */
300 local void try_help (void) ATTRIBUTE_NORETURN;
301 local void help (void);
302 local void license (void);
303 local void version (void);
304 local int input_eof (void);
305 local void treat_stdin (void);
306 local void treat_file (char *iname);
307 local int create_outfile (void);
308 local char *get_suffix (char *name);
309 local int open_input_file (char *iname, struct stat *sbuf);
310 local void discard_input_bytes (size_t nbytes, unsigned int flags);
311 local int make_ofname (void);
312 local void shorten_name (char *name);
313 local int get_method (int in);
314 local void do_list (int ifd, int method);
315 local int check_ofname (void);
316 local void copy_stat (struct stat *ifstat);
317 local void install_signal_handlers (void);
318 local void remove_output_file (void);
319 local RETSIGTYPE abort_gzip_signal (int);
320 local void do_exit (int exitcode) ATTRIBUTE_NORETURN;
321 static void finish_out (void);
322 int main (int argc, char **argv);
323 static int (*work) (int infile, int outfile) = zip; /* function to call */
326 local void treat_dir (int fd, char *dir);
329 #define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
334 fprintf (stderr, "Try `%s --help' for more information.\n",
339 /* ======================================================================== */
342 static char const* const help_msg[] = {
343 "Compress or uncompress FILEs (by default, compress FILES in-place).",
345 "Mandatory arguments to long options are mandatory for short options too.",
348 " -a, --ascii ascii text; convert end-of-line using local conventions",
350 " -c, --stdout write on standard output, keep original files unchanged",
351 " -d, --decompress decompress",
352 /* -e, --encrypt encrypt */
353 " -f, --force force overwrite of output file and compress links",
354 " -h, --help give this help",
355 /* -k, --pkzip force output in pkzip format */
356 " -k, --keep keep (don't delete) input files",
357 " -l, --list list compressed file contents",
358 " -L, --license display software license",
360 " -m do not save or restore the original modification time",
361 " -M, --time save or restore the original modification time",
363 " -n, --no-name do not save or restore the original name and time stamp",
364 " -N, --name save or restore the original name and time stamp",
365 " -q, --quiet suppress all warnings",
367 " -r, --recursive operate recursively on directories",
369 " --rsyncable make rsync-friendly archive",
370 " -S, --suffix=SUF use suffix SUF on compressed files",
371 " --synchronous synchronous output (safer if system crashes, but slower)",
372 " -t, --test test compressed file integrity",
373 " -v, --verbose verbose mode",
374 " -V, --version display version number",
375 " -1, --fast compress faster",
376 " -9, --best compress better",
378 " -Z, --lzw produce output compatible with old compress",
379 " -b, --bits=BITS max number of bits per code (implies -Z)",
382 "With no FILE, or when FILE is -, read standard input.",
384 "Report bugs to <bug-gzip@gnu.org>.",
386 char const *const *p = help_msg;
388 printf ("Usage: %s [OPTION]... [FILE]...\n", program_name);
389 while (*p) printf ("%s\n", *p++);
392 /* ======================================================================== */
395 char const *const *p = license_msg;
397 printf ("%s %s\n", program_name, Version);
398 while (*p) printf ("%s\n", *p++);
401 /* ======================================================================== */
406 printf ("Written by Jean-loup Gailly.\n");
409 local void progerror (char const *string)
412 fprintf (stderr, "%s: ", program_name);
418 /* ======================================================================== */
419 int main (int argc, char **argv)
421 int file_count; /* number of files to process */
422 size_t proglen; /* length of program_name */
427 EXPAND(argc, argv); /* wild card expansion if necessary */
429 program_name = gzip_base_name (argv[0]);
430 proglen = strlen (program_name);
432 /* Suppress .exe for MSDOS and OS/2: */
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 and OS/2.
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 (); finish_out (); break;
534 list = decompress = to_stdout = 1; break;
536 license (); finish_out (); 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 (); finish_out (); 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 (stdin_was_read && close (STDIN_FILENO) != 0)
669 strcpy (ifname, "stdin");
674 /* Output any totals, and check for output errors. */
675 if (!quiet && 1 < file_count)
677 if (fflush (stdout) != 0)
682 && fdatasync (STDOUT_FILENO) != 0 && errno != EINVAL)
683 || close (STDOUT_FILENO) != 0)
687 return exit_code; /* just to avoid lint warning */
690 /* Return nonzero when at end of file on input. */
694 if (!decompress || last_member)
699 if (insize != INBUFSIZ || fill_inbuf (1) == EOF)
702 /* Unget the char that fill_inbuf got. */
709 /* ========================================================================
710 * Compress or decompress stdin
712 local void treat_stdin()
715 && (presume_input_tty
716 || isatty (decompress ? STDIN_FILENO : STDOUT_FILENO))) {
717 /* Do not send compressed data to the terminal or read it from
718 * the terminal. We get here when user invoked the program
719 * without parameters, so be helpful. According to the GNU standards:
721 * If there is one behavior you think is most useful when the output
722 * is to a terminal, and another that you think is most useful when
723 * the output is a file or a pipe, then it is usually best to make
724 * the default behavior the one that is useful with output to a
725 * terminal, and have an option for the other behavior.
727 * Here we use the --force option to get the other behavior.
731 ("%s: compressed data not %s a terminal."
732 " Use -f to force %scompression.\n"
733 "For help, type: %s -h\n"),
735 decompress ? "read from" : "written to",
736 decompress ? "de" : "",
741 if (decompress || !ascii) {
742 SET_BINARY_MODE (STDIN_FILENO);
744 if (!test && !list && (!decompress || !ascii)) {
745 SET_BINARY_MODE (STDOUT_FILENO);
747 strcpy(ifname, "stdin");
748 strcpy(ofname, "stdout");
750 /* Get the file's time stamp and size. */
751 if (fstat (STDIN_FILENO, &istat) != 0)
753 progerror ("standard input");
756 ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1;
757 time_stamp.tv_nsec = -1;
758 if (!no_time || list)
760 if (S_ISREG (istat.st_mode))
761 time_stamp = get_stat_mtime (&istat);
763 gettime (&time_stamp);
766 clear_bufs(); /* clear input and output buffers */
770 stdin_was_read = true;
773 method = get_method(ifd);
775 do_exit(exit_code); /* error message already emitted */
779 do_list(ifd, method);
783 /* Actually do the compression/decompression. Loop over zipped members.
786 if (work (STDIN_FILENO, STDOUT_FILENO) != OK)
792 method = get_method(ifd);
793 if (method < 0) return; /* error message already emitted */
794 bytes_out = 0; /* required for length check */
799 fprintf(stderr, " OK\n");
801 } else if (!decompress) {
802 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
803 fprintf(stderr, "\n");
804 #ifdef DISPLAY_STDIN_RATIO
806 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
807 fprintf(stderr, "\n");
813 static char const dot = '.';
815 /* True if the cached directory for calls to openat etc. is DIR, with
816 length DIRLEN. DIR need not be null-terminated. DIRLEN must be
817 less than MAX_PATH_LEN. */
819 atdir_eq (char const *dir, ptrdiff_t dirlen)
822 dir = &dot, dirlen = 1;
823 return memcmp (dfname, dir, dirlen) == 0 && !dfname[dirlen];
826 /* Set the directory used for calls to openat etc. to be the directory
827 DIR, with length DIRLEN. DIR need not be null-terminated.
828 DIRLEN must be less than MAX_PATH_LEN. Return a file descriptor for
829 the directory, or -1 if one could not be obtained. */
831 atdir_set (char const *dir, ptrdiff_t dirlen)
833 /* Don't bother opening directories on older systems that
834 lack openat and unlinkat. It's not worth the porting hassle. */
835 #if HAVE_OPENAT && HAVE_UNLINKAT
836 enum { try_opening_directories = true };
838 enum { try_opening_directories = false };
841 if (try_opening_directories && ! atdir_eq (dir, dirlen))
846 dir = &dot, dirlen = 1;
847 memcpy (dfname, dir, dirlen);
848 dfname[dirlen] = '\0';
849 dfd = open (dfname, O_SEARCH | O_DIRECTORY);
855 /* ========================================================================
856 * Compress or decompress the given file
858 local void treat_file(iname)
861 /* Accept "-" as synonym for stdin */
862 if (strequ(iname, "-")) {
863 int cflag = to_stdout;
869 /* Check if the input file is present, set ifname and istat: */
870 ifd = open_input_file (iname, &istat);
874 /* If the input name is that of a directory, recurse or ignore: */
875 if (S_ISDIR(istat.st_mode)) {
878 treat_dir (ifd, iname);
879 /* Warning: ifname is now garbage */
884 WARN ((stderr, "%s: %s is a directory -- ignored\n",
885 program_name, ifname));
891 if (! S_ISREG (istat.st_mode))
894 "%s: %s is not a directory or a regular file - ignored\n",
895 program_name, ifname));
899 if (istat.st_mode & S_ISUID)
901 WARN ((stderr, "%s: %s is set-user-ID on execution - ignored\n",
902 program_name, ifname));
906 if (istat.st_mode & S_ISGID)
908 WARN ((stderr, "%s: %s is set-group-ID on execution - ignored\n",
909 program_name, ifname));
916 if (istat.st_mode & S_ISVTX)
919 "%s: %s has the sticky bit set - file ignored\n",
920 program_name, ifname));
924 if (2 <= istat.st_nlink)
926 WARN ((stderr, "%s: %s has %lu other link%c -- unchanged\n",
927 program_name, ifname,
928 (unsigned long int) istat.st_nlink - 1,
929 istat.st_nlink == 2 ? ' ' : 's'));
936 ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1;
937 time_stamp.tv_nsec = -1;
938 if (!no_time || list)
939 time_stamp = get_stat_mtime (&istat);
941 /* Generate output file name. For -r and (-t or -l), skip files
942 * without a valid gzip suffix (check done in make_ofname).
944 if (to_stdout && !list && !test) {
945 strcpy(ofname, "stdout");
947 } else if (make_ofname() != OK) {
952 clear_bufs(); /* clear input and output buffers */
956 method = get_method(ifd); /* updates ofname if original given */
959 return; /* error message already emitted */
963 do_list(ifd, method);
964 if (close (ifd) != 0)
969 /* If compressing to a file, check if ofname is not ambiguous
970 * because the operating system truncates names. Otherwise, generate
971 * a new ofname and save the original name in the compressed file.
975 /* Keep remove_ofname_fd negative. */
977 if (create_outfile() != OK) return;
979 if (!decompress && save_orig_name && !verbose && !quiet) {
980 fprintf(stderr, "%s: %s compressed to %s\n",
981 program_name, ifname, ofname);
984 /* Keep the name even if not truncated except with --no-name: */
985 if (!save_orig_name) save_orig_name = !no_name;
988 fprintf(stderr, "%s:\t", ifname);
991 /* Actually do the compression/decompression. Loop over zipped members.
994 if ((*work)(ifd, ofd) != OK) {
995 method = -1; /* force cleanup */
1002 method = get_method(ifd);
1003 if (method < 0) break; /* error message already emitted */
1004 bytes_out = 0; /* required for length check */
1007 if (close (ifd) != 0)
1015 && ((0 <= dfd && fdatasync (dfd) != 0 && errno != EINVAL)
1016 || (fsync (ofd) != 0 && errno != EINVAL)))
1017 || close (ofd) != 0)
1024 char *ifbase = last_component (ifname);
1025 int ufd = atdir_eq (ifname, ifbase - ifname) ? dfd : -1;
1028 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
1029 remove_ofname_fd = -1;
1030 res = ufd < 0 ? xunlink (ifname) : unlinkat (ufd, ifbase, 0);
1031 unlink_errno = res == 0 ? 0 : errno;
1032 sigprocmask (SIG_SETMASK, &oldset, NULL);
1036 WARN ((stderr, "%s: ", program_name));
1039 errno = unlink_errno;
1048 remove_output_file ();
1052 /* Display statistics */
1055 fprintf(stderr, " OK");
1056 } else if (decompress) {
1057 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
1059 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
1061 if (!test && !to_stdout)
1062 fprintf(stderr, " -- %s %s", keep ? "created" : "replaced with",
1064 fprintf(stderr, "\n");
1068 /* ========================================================================
1069 * Create the output file. Return OK or ERROR.
1070 * Try several times if necessary to avoid truncating the z_suffix. For
1071 * example, do not create a compressed file of name "1234567890123."
1072 * Sets save_orig_name to true if the file name has been truncated.
1073 * IN assertions: the input file has already been open (ifd is set) and
1074 * ofname has already been updated if there was an original name.
1075 * OUT assertions: ifd and ofd are closed in case of error.
1077 local int create_outfile()
1079 int name_shortened = 0;
1080 int flags = (O_WRONLY | O_CREAT | O_EXCL
1081 | (ascii && decompress ? 0 : O_BINARY));
1082 char const *base = ofname;
1083 int atfd = AT_FDCWD;
1087 char const *b = last_component (ofname);
1088 int f = atdir_set (ofname, b - ofname);
1101 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
1102 remove_ofname_fd = ofd = openat (atfd, base, flags, S_IRUSR | S_IWUSR);
1104 sigprocmask (SIG_SETMASK, &oldset, NULL);
1113 shorten_name (ofname);
1119 if (check_ofname () != OK)
1133 if (name_shortened && decompress)
1135 /* name might be too long if an original name was saved */
1136 WARN ((stderr, "%s: %s: warning, name truncated\n",
1137 program_name, ofname));
1143 /* ========================================================================
1144 * Return a pointer to the 'z' suffix of a file name, or NULL. For all
1145 * systems, ".gz", ".z", ".Z", ".taz", ".tgz", "-gz", "-z" and "_z" are
1146 * accepted suffixes, in addition to the value of the --suffix option.
1147 * ".tgz" is a useful convention for tar.z files on systems limited
1148 * to 3 characters extensions. On such systems, ".?z" and ".??z" are
1149 * also accepted suffixes. For Unix, we do not want to accept any
1150 * .??z suffix as indicating a compressed file; some people use .xyz
1151 * to denote volume data.
1153 local char *get_suffix(name)
1157 char suffix[MAX_SUFFIX+3]; /* last chars of name, forced to lower case */
1158 static char const *known_suffixes[] =
1159 {NULL, ".gz", ".z", ".taz", ".tgz", "-gz", "-z", "_z",
1160 #ifdef MAX_EXT_CHARS
1165 bool suffix_of_builtin = false;
1167 /* Normally put Z_SUFFIX at the start of KNOWN_SUFFIXES, but if it
1168 is a suffix of one of them, put it at the end. */
1169 for (suf = known_suffixes + 1; *suf; suf++)
1171 size_t suflen = strlen (*suf);
1172 if (z_len < suflen && strequ (z_suffix, *suf + suflen - z_len))
1174 suffix_of_builtin = true;
1178 known_suffixes[suffix_of_builtin
1179 ? sizeof known_suffixes / sizeof *known_suffixes - 2
1181 suf = known_suffixes + suffix_of_builtin;
1183 nlen = strlen(name);
1184 if (nlen <= MAX_SUFFIX+2) {
1185 strcpy(suffix, name);
1187 strcpy(suffix, name+nlen-MAX_SUFFIX-2);
1190 slen = strlen(suffix);
1192 int s = strlen(*suf);
1193 if (slen > s && ! ISSLASH (suffix[slen - s - 1])
1194 && strequ(suffix + slen - s, *suf)) {
1197 } while (*++suf != NULL);
1203 /* Open file NAME with the given flags and store its status
1204 into *ST. Return a file descriptor to the newly opened file, or -1
1205 (setting errno) on failure. */
1207 open_and_stat (char *name, int flags, struct stat *st)
1210 int atfd = AT_FDCWD;
1211 char const *base = name;
1213 /* Refuse to follow symbolic links unless -c or -f. */
1214 if (!to_stdout && !force)
1216 if (HAVE_WORKING_O_NOFOLLOW)
1217 flags |= O_NOFOLLOW;
1221 if (lstat (name, st) != 0)
1223 else if (S_ISLNK (st->st_mode))
1234 char const *b = last_component (name);
1235 int f = atdir_set (name, b - name);
1243 fd = openat (atfd, base, flags);
1244 if (0 <= fd && fstat (fd, st) != 0)
1255 /* ========================================================================
1256 * Set ifname to the input file name (with a suffix appended if necessary)
1257 * and istat to its stats. For decompression, if no file exists with the
1258 * original name, try adding successively z_suffix, .gz, .z, -z and .Z.
1259 * For MSDOS, we try only z_suffix and z.
1260 * Return an open file descriptor or -1.
1263 open_input_file (iname, sbuf)
1267 int ilen; /* strlen(ifname) */
1268 int z_suffix_errno = 0;
1269 static char const *suffixes[] = {NULL, ".gz", ".z", "-z", ".Z", NULL};
1270 char const **suf = suffixes;
1272 #ifdef NO_MULTIPLE_DOTS
1273 char *dot; /* pointer to ifname extension, or NULL */
1276 int open_flags = (O_RDONLY | O_NONBLOCK | O_NOCTTY
1277 | (ascii && !decompress ? 0 : O_BINARY));
1281 if (sizeof ifname - 1 <= strlen (iname))
1284 strcpy(ifname, iname);
1286 /* If input file exists, return OK. */
1287 fd = open_and_stat (ifname, open_flags, sbuf);
1291 if (!decompress || errno != ENOENT) {
1295 /* File.ext doesn't exist. Try adding a suffix. */
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 neither -m nor -n is 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 */
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 if (stamp <= TYPE_MAXIMUM (time_t))
1541 time_stamp.tv_sec = stamp;
1542 time_stamp.tv_nsec = 0;
1546 "%s: %s: MTIME %lu out of range for this platform\n",
1547 program_name, ifname, stamp));
1550 magic[8] = get_byte (); /* Ignore extra flags. */
1551 magic[9] = get_byte (); /* Ignore OS type. */
1553 if (flags & HEADER_CRC)
1555 magic[2] = DEFLATED;
1557 magic[4] = stamp & 0xff;
1558 magic[5] = (stamp >> 8) & 0xff;
1559 magic[6] = (stamp >> 16) & 0xff;
1560 magic[7] = stamp >> 24;
1565 if ((flags & EXTRA_FIELD) != 0) {
1567 unsigned int len = lenbuf[0] = get_byte ();
1568 len |= (lenbuf[1] = get_byte ()) << 8;
1570 fprintf(stderr,"%s: %s: extra field of %u bytes ignored\n",
1571 program_name, ifname, len);
1573 if (flags & HEADER_CRC)
1575 discard_input_bytes (len, flags);
1578 /* Get original file name if it was truncated */
1579 if ((flags & ORIG_NAME) != 0) {
1580 if (no_name || (to_stdout && !list) || part_nb > 1) {
1581 /* Discard the old name */
1582 discard_input_bytes (-1, flags);
1584 /* Copy the base name. Keep a directory prefix intact. */
1585 char *p = gzip_base_name (ofname);
1588 *p = (char) get_byte ();
1589 if (*p++ == '\0') break;
1590 if (p >= ofname+sizeof(ofname)) {
1591 gzip_error ("corrupted input -- file name too large");
1594 if (flags & HEADER_CRC)
1595 updcrc ((uch *) base, p - base);
1596 p = gzip_base_name (base);
1597 memmove (base, p, strlen (p) + 1);
1598 /* If necessary, adapt the name to local OS conventions: */
1600 MAKE_LEGAL_NAME(base);
1601 if (base) list=0; /* avoid warning about unused variable */
1603 } /* no_name || to_stdout */
1606 /* Discard file comment if any */
1607 if ((flags & COMMENT) != 0) {
1608 discard_input_bytes (-1, flags);
1611 if (flags & HEADER_CRC)
1613 unsigned int crc16 = updcrc (magic, 0) & 0xffff;
1614 unsigned int header16 = get_byte ();
1615 header16 |= ((unsigned int) get_byte ()) << 8;
1616 if (header16 != crc16)
1619 "%s: %s: header checksum 0x%04x != computed checksum 0x%04x\n",
1620 program_name, ifname, header16, crc16);
1628 header_bytes = inptr + 2*4; /* include crc and size */
1631 } else if (memcmp(magic, PKZIP_MAGIC, 2) == 0 && inptr == 2
1632 && memcmp((char*)inbuf, PKZIP_MAGIC, 4) == 0) {
1633 /* To simplify the code, we support a zip file when alone only.
1634 * We are thus guaranteed that the entire local header fits in inbuf.
1638 if (check_zipfile(in) != OK) return -1;
1639 /* check_zipfile may get ofname from the local header */
1642 } else if (memcmp(magic, PACK_MAGIC, 2) == 0) {
1646 } else if (memcmp(magic, LZW_MAGIC, 2) == 0) {
1648 method = COMPRESSED;
1651 } else if (memcmp(magic, LZH_MAGIC, 2) == 0) {
1656 } else if (force && to_stdout && !list) { /* pass input unchanged */
1662 if (imagic0 != EOF) {
1663 write_buf (STDOUT_FILENO, magic, 1);
1667 if (method >= 0) return method;
1670 fprintf (stderr, "\n%s: %s: not in gzip format\n",
1671 program_name, ifname);
1678 for (inbyte = imagic1; inbyte == 0; inbyte = try_byte ())
1683 WARN ((stderr, "\n%s: %s: decompression OK, trailing zero bytes ignored\n",
1684 program_name, ifname));
1689 WARN((stderr, "\n%s: %s: decompression OK, trailing garbage ignored\n",
1690 program_name, ifname));
1695 /* ========================================================================
1696 * Display the characteristics of the compressed file.
1697 * If the given method is < 0, display the accumulated totals.
1698 * IN assertions: time_stamp, header_bytes and ifile_size are initialized.
1700 local void do_list(ifd, method)
1701 int ifd; /* input file descriptor */
1702 int method; /* compression method */
1704 ulg crc; /* original crc */
1705 static int first_time = 1;
1706 static char const *const methods[MAX_METHODS] = {
1711 "", "", "", "", /* 4 to 7 reserved */
1713 int positive_off_t_width = 1;
1716 for (o = OFF_T_MAX; 9 < o; o /= 10) {
1717 positive_off_t_width++;
1720 if (first_time && method >= 0) {
1723 printf("method crc date time ");
1726 printf("%*.*s %*.*s ratio uncompressed_name\n",
1727 positive_off_t_width, positive_off_t_width, "compressed",
1728 positive_off_t_width, positive_off_t_width, "uncompressed");
1730 } else if (method < 0) {
1731 if (total_in <= 0 || total_out <= 0) return;
1735 if (verbose || !quiet) {
1736 fprint_off(stdout, total_in, positive_off_t_width);
1738 fprint_off(stdout, total_out, positive_off_t_width);
1741 display_ratio(total_out-(total_in-header_bytes), total_out, stdout);
1742 /* header_bytes is not meaningful but used to ensure the same
1743 * ratio if there is a single file.
1745 printf(" (totals)\n");
1748 crc = (ulg)~0; /* unknown */
1750 bytes_in = ifile_size;
1752 if (method == DEFLATED && !last_member) {
1753 /* Get the crc and uncompressed size for gzip'ed (not zip'ed) files.
1754 * If the lseek fails, we could use read() to get to the end, but
1755 * --list is used to get quick results.
1756 * Use "gunzip < foo.gz | wc -c" to get the uncompressed size if
1757 * you are not concerned about speed.
1759 bytes_in = lseek(ifd, (off_t)(-8), SEEK_END);
1760 if (bytes_in != -1L) {
1763 if (read(ifd, (char*)buf, sizeof(buf)) != sizeof(buf)) {
1767 bytes_out = LG(buf+4);
1773 static char const month_abbr[][4]
1774 = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
1775 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
1776 struct tm *tm = localtime (&time_stamp.tv_sec);
1777 printf ("%5s %08lx ", methods[method], crc);
1779 printf ("%s%3d %02d:%02d ", month_abbr[tm->tm_mon],
1780 tm->tm_mday, tm->tm_hour, tm->tm_min);
1782 printf ("??? ?? ??:?? ");
1784 fprint_off(stdout, bytes_in, positive_off_t_width);
1786 fprint_off(stdout, bytes_out, positive_off_t_width);
1788 if (bytes_in == -1L) {
1790 bytes_in = bytes_out = header_bytes = 0;
1791 } else if (total_in >= 0) {
1792 total_in += bytes_in;
1794 if (bytes_out == -1L) {
1796 bytes_in = bytes_out = header_bytes = 0;
1797 } else if (total_out >= 0) {
1798 total_out += bytes_out;
1800 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out, stdout);
1801 printf(" %s\n", ofname);
1804 /* ========================================================================
1805 * Shorten the given name by one character, or replace a .tar extension
1806 * with .tgz. Truncate the last part of the name which is longer than
1807 * MIN_PART characters: 1234.678.012.gz -> 123.678.012.gz. If the name
1808 * has only parts shorter than MIN_PART truncate the longest part.
1809 * For decompression, just remove the last character of the name.
1811 * IN assertion: for compression, the suffix of the given name is z_suffix.
1813 local void shorten_name(name)
1816 int len; /* length of name without z_suffix */
1817 char *trunc = NULL; /* character to be truncated */
1818 int plen; /* current part length */
1819 int min_part = MIN_PART; /* current minimum part length */
1825 gzip_error ("name too short");
1829 p = get_suffix(name);
1831 gzip_error ("can't recover suffix\n");
1835 /* compress 1234567890.tar to 1234567890.tgz */
1836 if (len > 4 && strequ(p-4, ".tar")) {
1837 strcpy(p-4, ".tgz");
1840 /* Try keeping short extensions intact:
1841 * 1234.678.012.gz -> 123.678.012.gz
1844 p = last_component (name);
1846 plen = strcspn(p, PART_SEP);
1848 if (plen > min_part) trunc = p-1;
1851 } while (trunc == NULL && --min_part != 0);
1853 if (trunc != NULL) {
1855 trunc[0] = trunc[1];
1859 trunc = strrchr(name, PART_SEP[0]);
1861 gzip_error ("internal error in shorten_name");
1862 if (trunc[1] == '\0') trunc--; /* force truncation */
1864 strcpy(trunc, z_suffix);
1867 /* ========================================================================
1868 * The compressed file already exists, so ask for confirmation.
1869 * Return ERROR if the file must be skipped.
1871 local int check_ofname()
1873 /* Ask permission to overwrite the existing file */
1876 fprintf (stderr, "%s: %s already exists;", program_name, ofname);
1877 if (foreground && (presume_input_tty || isatty (STDIN_FILENO))) {
1878 fprintf(stderr, " do you wish to overwrite (y or n)? ");
1883 fprintf(stderr, "\tnot overwritten\n");
1884 if (exit_code == OK) exit_code = WARNING;
1888 if (xunlink (ofname)) {
1895 /* Change the owner and group of a file. FD is a file descriptor for
1896 the file and NAME its name. Change it to user UID and to group GID.
1897 If UID or GID is -1, though, do not change the corresponding user
1900 do_chown (int fd, char const *name, uid_t uid, gid_t gid)
1904 ignore_value (fchown (fd, uid, gid));
1906 ignore_value (chown (name, uid, gid));
1911 /* ========================================================================
1912 * Copy modes, times, ownership from input file to output file.
1913 * IN assertion: to_stdout is false.
1915 local void copy_stat(ifstat)
1916 struct stat *ifstat;
1918 mode_t mode = ifstat->st_mode & S_IRWXUGO;
1922 struct timespec timespec[2];
1923 timespec[0] = get_stat_atime (ifstat);
1924 timespec[1] = get_stat_mtime (ifstat);
1926 if (decompress && 0 <= time_stamp.tv_nsec
1927 && ! (timespec[1].tv_sec == time_stamp.tv_sec
1928 && timespec[1].tv_nsec == time_stamp.tv_nsec))
1930 timespec[1] = time_stamp;
1932 fprintf(stderr, "%s: time stamp restored\n", ofname);
1936 if (fdutimens (ofd, ofname, timespec) != 0)
1939 WARN ((stderr, "%s: ", program_name));
1948 /* Change the group first, then the permissions, then the owner.
1949 That way, the permissions will be correct on systems that allow
1950 users to give away files, without introducing a security hole.
1951 Security depends on permissions not containing the setuid or
1954 do_chown (ofd, ofname, -1, ifstat->st_gid);
1957 r = fchmod (ofd, mode);
1959 r = chmod (ofname, mode);
1963 WARN ((stderr, "%s: ", program_name));
1970 do_chown (ofd, ofname, ifstat->st_uid, -1);
1975 /* ========================================================================
1976 * Recurse through the given directory.
1978 local void treat_dir (fd, dir)
1983 char nbuf[MAX_PATH_LEN];
1988 dirp = fdopendir (fd);
1996 entries = streamsavedir (dirp, SAVEDIR_SORT_NONE);
1999 if (closedir (dirp) != 0)
2004 for (entry = entries; *entry; entry += entrylen + 1) {
2005 size_t len = strlen (dir);
2006 entrylen = strlen (entry);
2007 if (strequ (entry, ".") || strequ (entry, ".."))
2009 if (len + entrylen < MAX_PATH_LEN - 2) {
2011 if (*last_component (nbuf) && !ISSLASH (nbuf[len - 1]))
2013 strcpy (nbuf + len, entry);
2016 fprintf(stderr,"%s: %s/%s: pathname too long\n",
2017 program_name, dir, entry);
2023 #endif /* ! NO_DIR */
2025 /* Make sure signals get handled properly. */
2028 install_signal_handlers ()
2030 int nsigs = sizeof handled_sig / sizeof handled_sig[0];
2034 struct sigaction act;
2036 sigemptyset (&caught_signals);
2037 for (i = 0; i < nsigs; i++)
2039 sigaction (handled_sig[i], NULL, &act);
2040 if (act.sa_handler != SIG_IGN)
2041 sigaddset (&caught_signals, handled_sig[i]);
2044 act.sa_handler = abort_gzip_signal;
2045 act.sa_mask = caught_signals;
2048 for (i = 0; i < nsigs; i++)
2049 if (sigismember (&caught_signals, handled_sig[i]))
2053 sigaction (handled_sig[i], &act, NULL);
2056 for (i = 0; i < nsigs; i++)
2057 if (signal (handled_sig[i], SIG_IGN) != SIG_IGN)
2061 signal (handled_sig[i], abort_gzip_signal);
2062 siginterrupt (handled_sig[i], 1);
2067 /* ========================================================================
2068 * Free all dynamically allocated variables and exit with the given code.
2070 local void do_exit(exitcode)
2073 static int in_exit = 0;
2075 if (in_exit) exit(exitcode);
2095 if (fclose (stdout) != 0)
2100 /* ========================================================================
2101 * Close and unlink the output file.
2104 remove_output_file ()
2109 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
2110 fd = remove_ofname_fd;
2113 remove_ofname_fd = -1;
2117 sigprocmask (SIG_SETMASK, &oldset, NULL);
2120 /* ========================================================================
2126 remove_output_file ();
2130 /* ========================================================================
2134 abort_gzip_signal (sig)
2138 signal (sig, SIG_IGN);
2139 remove_output_file ();
2140 if (sig == exiting_signal)
2142 signal (sig, SIG_DFL);