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 static int ascii = 0; /* convert end-of-lines to local OS conventions */
163 int to_stdout = 0; /* output to stdout (-c) */
164 static int decompress = 0; /* decompress (-d) */
165 static int force = 0; /* don't ask questions, compress links (-f) */
166 static int keep = 0; /* keep (don't delete) input files */
167 static int no_name = -1; /* don't save or restore the original file name */
168 static int no_time = -1; /* don't save or restore the original file time */
169 static int recursive = 0; /* recurse through directories (-r) */
170 static int list = 0; /* list the file contents (-l) */
171 int verbose = 0; /* be verbose (-v) */
172 int quiet = 0; /* be very quiet (-q) */
173 static int do_lzw = 0; /* generate output compatible with old compress (-Z) */
174 int test = 0; /* test .gz file integrity */
175 static int foreground = 0; /* set if program run in foreground */
176 char *program_name; /* program name */
177 int maxbits = BITS; /* max bits per code for LZW */
178 int method = DEFLATED;/* compression method */
179 int level = 6; /* compression level */
180 int exit_code = OK; /* program exit code */
181 int save_orig_name; /* set if original name must be saved */
182 static int last_member; /* set for .zip and .Z files */
183 static int part_nb; /* number of parts in .gz file */
184 struct timespec time_stamp; /* original time stamp (modification time) */
185 off_t ifile_size; /* input file size, -1 for devices (debug only) */
186 static char *env; /* contents of GZIP env variable */
187 static char const *z_suffix; /* default suffix (can be set with --suffix) */
188 static size_t z_len; /* strlen(z_suffix) */
190 /* The set of signals that are caught. */
191 static sigset_t caught_signals;
193 /* If nonzero then exit with status WARNING, rather than with the usual
194 signal status, on receipt of a signal with this value. This
195 suppresses a "Broken Pipe" message with some shells. */
196 static int volatile exiting_signal;
198 /* If nonnegative, close this file descriptor and unlink ofname on error. */
199 static int volatile remove_ofname_fd = -1;
201 off_t bytes_in; /* number of input bytes */
202 off_t bytes_out; /* number of output bytes */
203 static off_t total_in; /* input bytes for all files */
204 static off_t total_out; /* output bytes for all files */
205 char ifname[MAX_PATH_LEN]; /* input file name */
206 char ofname[MAX_PATH_LEN]; /* output file name */
207 static char dfname[MAX_PATH_LEN]; /* name of dir containing output file */
208 static struct stat istat; /* status for input file */
209 int ifd; /* input file descriptor */
210 int ofd; /* output file descriptor */
211 static int dfd = -1; /* output directory file descriptor */
212 unsigned insize; /* valid bytes in inbuf */
213 unsigned inptr; /* index of next byte to be processed in inbuf */
214 unsigned outcnt; /* bytes in output buffer */
216 static int handled_sig[] =
218 /* SIGINT must be first, as 'foreground' depends on it. */
238 /* For long options that have no equivalent short option, use a
239 non-character as a pseudo short option, starting with CHAR_MAX + 1. */
242 PRESUME_INPUT_TTY_OPTION = CHAR_MAX + 1,
244 /* A value greater than all valid long options, used as a flag to
245 distinguish options derived from the GZIP environment variable. */
249 static char const shortopts[] = "ab:cdfhH?klLmMnNqrS:tvVZ123456789";
251 static const struct option longopts[] =
253 /* { name has_arg *flag val } */
254 {"ascii", 0, 0, 'a'}, /* ascii text mode */
255 {"to-stdout", 0, 0, 'c'}, /* write output on standard output */
256 {"stdout", 0, 0, 'c'}, /* write output on standard output */
257 {"decompress", 0, 0, 'd'}, /* decompress */
258 {"uncompress", 0, 0, 'd'}, /* decompress */
259 /* {"encrypt", 0, 0, 'e'}, encrypt */
260 {"force", 0, 0, 'f'}, /* force overwrite of output file */
261 {"help", 0, 0, 'h'}, /* give help */
262 /* {"pkzip", 0, 0, 'k'}, force output in pkzip format */
263 {"keep", 0, 0, 'k'}, /* keep (don't delete) input files */
264 {"list", 0, 0, 'l'}, /* list .gz file contents */
265 {"license", 0, 0, 'L'}, /* display software license */
266 {"no-name", 0, 0, 'n'}, /* don't save or restore original name & time */
267 {"name", 0, 0, 'N'}, /* save or restore original name & time */
268 {"-presume-input-tty", no_argument, NULL, PRESUME_INPUT_TTY_OPTION},
269 {"quiet", 0, 0, 'q'}, /* quiet mode */
270 {"silent", 0, 0, 'q'}, /* quiet mode */
271 {"recursive", 0, 0, 'r'}, /* recurse through directories */
272 {"suffix", 1, 0, 'S'}, /* use given suffix instead of .gz */
273 {"test", 0, 0, 't'}, /* test compressed file integrity */
274 {"no-time", 0, 0, 'T'}, /* don't save or restore the time stamp */
275 {"verbose", 0, 0, 'v'}, /* verbose mode */
276 {"version", 0, 0, 'V'}, /* display version number */
277 {"fast", 0, 0, '1'}, /* compress faster */
278 {"best", 0, 0, '9'}, /* compress better */
279 {"lzw", 0, 0, 'Z'}, /* make output compatible with old compress */
280 {"bits", 1, 0, 'b'}, /* max number of bits per code (implies -Z) */
285 /* local functions */
287 local void try_help (void) ATTRIBUTE_NORETURN;
288 local void help (void);
289 local void license (void);
290 local void version (void);
291 local int input_eof (void);
292 local void treat_stdin (void);
293 local void treat_file (char *iname);
294 local int create_outfile (void);
295 local char *get_suffix (char *name);
296 local int open_input_file (char *iname, struct stat *sbuf);
297 local void discard_input_bytes (size_t nbytes, unsigned int flags);
298 local int make_ofname (void);
299 local void shorten_name (char *name);
300 local int get_method (int in);
301 local void do_list (int ifd, int method);
302 local int check_ofname (void);
303 local void copy_stat (struct stat *ifstat);
304 local void install_signal_handlers (void);
305 local void remove_output_file (void);
306 local RETSIGTYPE abort_gzip_signal (int);
307 local void do_exit (int exitcode) ATTRIBUTE_NORETURN;
308 int main (int argc, char **argv);
309 static int (*work) (int infile, int outfile) = zip; /* function to call */
312 local void treat_dir (int fd, char *dir);
315 #define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
320 fprintf (stderr, "Try `%s --help' for more information.\n",
325 /* ======================================================================== */
328 static char const* const help_msg[] = {
329 "Compress or uncompress FILEs (by default, compress FILES in-place).",
331 "Mandatory arguments to long options are mandatory for short options too.",
334 " -a, --ascii ascii text; convert end-of-line using local conventions",
336 " -c, --stdout write on standard output, keep original files unchanged",
337 " -d, --decompress decompress",
338 /* -e, --encrypt encrypt */
339 " -f, --force force overwrite of output file and compress links",
340 " -h, --help give this help",
341 /* -k, --pkzip force output in pkzip format */
342 " -k, --keep keep (don't delete) input files",
343 " -l, --list list compressed file contents",
344 " -L, --license display software license",
346 " -m, --no-time do not save or restore the original modification time",
347 " -M, --time save or restore the original modification time",
349 " -n, --no-name do not save or restore the original name and time stamp",
350 " -N, --name save or restore the original name and time stamp",
351 " -q, --quiet suppress all warnings",
353 " -r, --recursive operate recursively on directories",
355 " -S, --suffix=SUF use suffix SUF on compressed files",
356 " -t, --test test compressed file integrity",
357 " -v, --verbose verbose mode",
358 " -V, --version display version number",
359 " -1, --fast compress faster",
360 " -9, --best compress better",
362 " -Z, --lzw produce output compatible with old compress",
363 " -b, --bits=BITS max number of bits per code (implies -Z)",
366 "With no FILE, or when FILE is -, read standard input.",
368 "Report bugs to <bug-gzip@gnu.org>.",
370 char const *const *p = help_msg;
372 printf ("Usage: %s [OPTION]... [FILE]...\n", program_name);
373 while (*p) printf ("%s\n", *p++);
376 /* ======================================================================== */
379 char const *const *p = license_msg;
381 printf ("%s %s\n", program_name, Version);
382 while (*p) printf ("%s\n", *p++);
385 /* ======================================================================== */
390 printf ("Written by Jean-loup Gailly.\n");
393 local void progerror (char const *string)
396 fprintf (stderr, "%s: ", program_name);
402 /* ======================================================================== */
403 int main (int argc, char **argv)
405 int file_count; /* number of files to process */
406 size_t proglen; /* length of program_name */
411 EXPAND(argc, argv); /* wild card expansion if necessary */
413 program_name = gzip_base_name (argv[0]);
414 proglen = strlen (program_name);
416 atexit (close_stdin);
418 /* Suppress .exe for MSDOS, OS/2 and VMS: */
419 if (4 < proglen && strequ (program_name + proglen - 4, ".exe"))
420 program_name[proglen - 4] = '\0';
422 /* Add options in GZIP environment variable if there is one */
424 env = add_envopt (&env_argc, &argv_copy, OPTIONS_VAR);
425 env_argv = env ? argv_copy : NULL;
428 # define GNU_STANDARD 1
431 /* For compatibility with old compress, use program name as an option.
432 * Unless you compile with -DGNU_STANDARD=0, this program will behave as
433 * gzip even if it is invoked under the name gunzip or zcat.
435 * Systems which do not support links can still use -d or -dc.
436 * Ignore an .exe extension for MSDOS, OS/2 and VMS.
438 if (strncmp (program_name, "un", 2) == 0 /* ungzip, uncompress */
439 || strncmp (program_name, "gun", 3) == 0) /* gunzip */
441 else if (strequ (program_name + 1, "cat") /* zcat, pcat, gcat */
442 || strequ (program_name, "gzcat")) /* gzcat */
443 decompress = to_stdout = 1;
447 z_len = strlen(z_suffix);
455 if (env_argv[optind] && strequ (env_argv[optind], "--"))
456 optc = ENV_OPTION + '-';
459 optc = getopt_long (env_argc, env_argv, shortopts, longopts,
465 if (optind != env_argc)
468 ("%s: %s: non-option in "OPTIONS_VAR
469 " environment variable\n"),
470 program_name, env_argv[optind]);
474 /* Wait until here before warning, so that GZIP='-q'
476 if (env_argc != 1 && !quiet)
478 ("%s: warning: "OPTIONS_VAR" environment variable"
479 " is deprecated; use an alias or script\n"),
482 /* Start processing ARGC and ARGV instead. */
492 optc = getopt_long (argc, argv, shortopts, longopts, &longind);
500 maxbits = atoi(optarg);
501 for (; *optarg; optarg++)
502 if (! ('0' <= *optarg && *optarg <= '9'))
504 fprintf (stderr, "%s: -b operand is not an integer\n",
510 to_stdout = 1; break;
512 decompress = 1; break;
516 help(); do_exit(OK); break;
520 list = decompress = to_stdout = 1; break;
522 license(); do_exit(OK); break;
523 case 'm': /* undocumented, may change later */
525 case 'M': /* undocumented, may change later */
528 case 'n' + ENV_OPTION:
529 no_name = no_time = 1; break;
531 case 'N' + ENV_OPTION:
532 no_name = no_time = 0; break;
533 case PRESUME_INPUT_TTY_OPTION:
534 presume_input_tty = true; break;
536 case 'q' + ENV_OPTION:
537 quiet = 1; verbose = 0; break;
540 fprintf (stderr, "%s: -r not supported on this system\n",
548 #ifdef NO_MULTIPLE_DOTS
549 if (*optarg == '.') optarg++;
551 z_len = strlen(optarg);
555 test = decompress = to_stdout = 1;
558 case 'v' + ENV_OPTION:
559 verbose++; quiet = 0; break;
561 version(); do_exit(OK); break;
566 fprintf(stderr, "%s: -Z not supported in this version\n",
571 case '1' + ENV_OPTION: case '2' + ENV_OPTION: case '3' + ENV_OPTION:
572 case '4' + ENV_OPTION: case '5' + ENV_OPTION: case '6' + ENV_OPTION:
573 case '7' + ENV_OPTION: case '8' + ENV_OPTION: case '9' + ENV_OPTION:
576 case '1': case '2': case '3': case '4':
577 case '5': case '6': case '7': case '8': case '9':
582 if (ENV_OPTION <= optc && optc != ENV_OPTION + '?')
584 /* Output a diagnostic, since getopt_long didn't. */
585 fprintf (stderr, "%s: ", program_name);
587 fprintf (stderr, "-%c: ", optc - ENV_OPTION);
589 fprintf (stderr, "--%s: ", longopts[longind].name);
590 fprintf (stderr, ("option not valid in "OPTIONS_VAR
591 " environment variable\n"));
595 } /* loop on all arguments */
597 /* By default, save name and timestamp on compression but do not
598 * restore them on decompression.
600 if (no_time < 0) no_time = decompress;
601 if (no_name < 0) no_name = decompress;
603 file_count = argc - optind;
607 if (ascii && !quiet) {
608 fprintf(stderr, "%s: option --ascii ignored on this system\n",
612 if (z_len == 0 || z_len > MAX_SUFFIX) {
613 fprintf(stderr, "%s: invalid suffix '%s'\n", program_name, z_suffix);
617 if (do_lzw && !decompress) work = lzw;
619 /* Allocate all global buffers (for DYN_ALLOC option) */
620 ALLOC(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
621 ALLOC(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
622 ALLOC(ush, d_buf, DIST_BUFSIZE);
623 ALLOC(uch, window, 2L*WSIZE);
625 ALLOC(ush, tab_prefix, 1L<<BITS);
627 ALLOC(ush, tab_prefix0, 1L<<(BITS-1));
628 ALLOC(ush, tab_prefix1, 1L<<(BITS-1));
631 exiting_signal = quiet ? SIGPIPE : 0;
632 install_signal_handlers ();
634 /* And get to work */
635 if (file_count != 0) {
636 if (to_stdout && !test && !list && (!decompress || !ascii)) {
637 SET_BINARY_MODE(fileno(stdout));
639 while (optind < argc) {
640 treat_file(argv[optind++]);
642 } else { /* Standard input */
645 if (list && !quiet && file_count > 1) {
646 do_list(-1, -1); /* print totals */
649 return exit_code; /* just to avoid lint warning */
652 /* Return nonzero when at end of file on input. */
656 if (!decompress || last_member)
661 if (insize != INBUFSIZ || fill_inbuf (1) == EOF)
664 /* Unget the char that fill_inbuf got. */
671 /* ========================================================================
672 * Compress or decompress stdin
674 local void treat_stdin()
677 && (presume_input_tty
678 || isatty(fileno((FILE *)(decompress ? stdin : stdout))))) {
679 /* Do not send compressed data to the terminal or read it from
680 * the terminal. We get here when user invoked the program
681 * without parameters, so be helpful. According to the GNU standards:
683 * If there is one behavior you think is most useful when the output
684 * is to a terminal, and another that you think is most useful when
685 * the output is a file or a pipe, then it is usually best to make
686 * the default behavior the one that is useful with output to a
687 * terminal, and have an option for the other behavior.
689 * Here we use the --force option to get the other behavior.
693 ("%s: compressed data not %s a terminal."
694 " Use -f to force %scompression.\n"
695 "For help, type: %s -h\n"),
697 decompress ? "read from" : "written to",
698 decompress ? "de" : "",
703 if (decompress || !ascii) {
704 SET_BINARY_MODE(fileno(stdin));
706 if (!test && !list && (!decompress || !ascii)) {
707 SET_BINARY_MODE(fileno(stdout));
709 strcpy(ifname, "stdin");
710 strcpy(ofname, "stdout");
712 /* Get the file's time stamp and size. */
713 if (fstat (fileno (stdin), &istat) != 0)
715 progerror ("standard input");
718 ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1;
719 time_stamp.tv_nsec = -1;
720 if (!no_time || list)
722 if (S_ISREG (istat.st_mode))
723 time_stamp = get_stat_mtime (&istat);
725 gettime (&time_stamp);
728 clear_bufs(); /* clear input and output buffers */
734 method = get_method(ifd);
736 do_exit(exit_code); /* error message already emitted */
740 do_list(ifd, method);
744 /* Actually do the compression/decompression. Loop over zipped members.
747 if ((*work)(fileno(stdin), fileno(stdout)) != OK) return;
752 method = get_method(ifd);
753 if (method < 0) return; /* error message already emitted */
754 bytes_out = 0; /* required for length check */
759 fprintf(stderr, " OK\n");
761 } else if (!decompress) {
762 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
763 fprintf(stderr, "\n");
764 #ifdef DISPLAY_STDIN_RATIO
766 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
767 fprintf(stderr, "\n");
773 static char const dot = '.';
775 /* True if the cached directory for calls to openat etc. is DIR, with
776 length DIRLEN. DIR need not be null-terminated. DIRLEN must be
777 less than MAX_PATH_LEN. */
779 atdir_eq (char const *dir, ptrdiff_t dirlen)
782 dir = &dot, dirlen = 1;
783 return memcmp (dfname, dir, dirlen) == 0 && !dfname[dirlen];
786 /* Set the directory used for calls to openat etc. to be the directory
787 DIR, with length DIRLEN. DIR need not be null-terminated.
788 DIRLEN must be less than MAX_PATH_LEN. Return a file descriptor for
789 the directory, or -1 if one could not be obtained. */
791 atdir_set (char const *dir, ptrdiff_t dirlen)
793 /* Don't bother opening directories on older systems that
794 lack openat and unlinkat. It's not worth the porting hassle. */
795 #if HAVE_OPENAT && HAVE_UNLINKAT
796 enum { try_opening_directories = true };
798 enum { try_opening_directories = false };
801 if (try_opening_directories && ! atdir_eq (dir, dirlen))
806 dir = &dot, dirlen = 1;
807 memcpy (dfname, dir, dirlen);
808 dfname[dirlen] = '\0';
809 dfd = open (dfname, O_SEARCH | O_DIRECTORY);
815 /* ========================================================================
816 * Compress or decompress the given file
818 local void treat_file(iname)
821 /* Accept "-" as synonym for stdin */
822 if (strequ(iname, "-")) {
823 int cflag = to_stdout;
829 /* Check if the input file is present, set ifname and istat: */
830 ifd = open_input_file (iname, &istat);
834 /* If the input name is that of a directory, recurse or ignore: */
835 if (S_ISDIR(istat.st_mode)) {
838 treat_dir (ifd, iname);
839 /* Warning: ifname is now garbage */
844 WARN ((stderr, "%s: %s is a directory -- ignored\n",
845 program_name, ifname));
851 if (! S_ISREG (istat.st_mode))
854 "%s: %s is not a directory or a regular file - ignored\n",
855 program_name, ifname));
859 if (istat.st_mode & S_ISUID)
861 WARN ((stderr, "%s: %s is set-user-ID on execution - ignored\n",
862 program_name, ifname));
866 if (istat.st_mode & S_ISGID)
868 WARN ((stderr, "%s: %s is set-group-ID on execution - ignored\n",
869 program_name, ifname));
876 if (istat.st_mode & S_ISVTX)
879 "%s: %s has the sticky bit set - file ignored\n",
880 program_name, ifname));
884 if (2 <= istat.st_nlink)
886 WARN ((stderr, "%s: %s has %lu other link%c -- unchanged\n",
887 program_name, ifname,
888 (unsigned long int) istat.st_nlink - 1,
889 istat.st_nlink == 2 ? ' ' : 's'));
896 ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1;
897 time_stamp.tv_nsec = -1;
898 if (!no_time || list)
899 time_stamp = get_stat_mtime (&istat);
901 /* Generate output file name. For -r and (-t or -l), skip files
902 * without a valid gzip suffix (check done in make_ofname).
904 if (to_stdout && !list && !test) {
905 strcpy(ofname, "stdout");
907 } else if (make_ofname() != OK) {
912 clear_bufs(); /* clear input and output buffers */
916 method = get_method(ifd); /* updates ofname if original given */
919 return; /* error message already emitted */
923 do_list(ifd, method);
924 if (close (ifd) != 0)
929 /* If compressing to a file, check if ofname is not ambiguous
930 * because the operating system truncates names. Otherwise, generate
931 * a new ofname and save the original name in the compressed file.
934 ofd = fileno(stdout);
935 /* Keep remove_ofname_fd negative. */
937 if (create_outfile() != OK) return;
939 if (!decompress && save_orig_name && !verbose && !quiet) {
940 fprintf(stderr, "%s: %s compressed to %s\n",
941 program_name, ifname, ofname);
944 /* Keep the name even if not truncated except with --no-name: */
945 if (!save_orig_name) save_orig_name = !no_name;
948 fprintf(stderr, "%s:\t", ifname);
951 /* Actually do the compression/decompression. Loop over zipped members.
954 if ((*work)(ifd, ofd) != OK) {
955 method = -1; /* force cleanup */
962 method = get_method(ifd);
963 if (method < 0) break; /* error message already emitted */
964 bytes_out = 0; /* required for length check */
967 if (close (ifd) != 0)
974 /* If KEEP, transfer output data to the output file's storage device.
975 Otherwise, if the system crashed now the user might lose
976 both input and output data. See: Pillai TS et al. All
977 file systems are not created equal: on the complexity of
978 crafting crash-consistent applications. OSDI'14. 2014:433-48.
979 https://www.usenix.org/conference/osdi14/technical-sessions/presentation/pillai */
981 && ((0 <= dfd && fdatasync (dfd) != 0 && errno != EINVAL)
982 || (fsync (ofd) != 0 && errno != EINVAL)))
990 char *ifbase = last_component (ifname);
991 int ufd = atdir_eq (ifname, ifbase - ifname) ? dfd : -1;
994 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
995 remove_ofname_fd = -1;
996 res = ufd < 0 ? xunlink (ifname) : unlinkat (ufd, ifbase, 0);
997 unlink_errno = res == 0 ? 0 : errno;
998 sigprocmask (SIG_SETMASK, &oldset, NULL);
1002 WARN ((stderr, "%s: ", program_name));
1005 errno = unlink_errno;
1014 remove_output_file ();
1018 /* Display statistics */
1021 fprintf(stderr, " OK");
1022 } else if (decompress) {
1023 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
1025 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
1027 if (!test && !to_stdout)
1028 fprintf(stderr, " -- %s %s", keep ? "created" : "replaced with",
1030 fprintf(stderr, "\n");
1034 /* ========================================================================
1035 * Create the output file. Return OK or ERROR.
1036 * Try several times if necessary to avoid truncating the z_suffix. For
1037 * example, do not create a compressed file of name "1234567890123."
1038 * Sets save_orig_name to true if the file name has been truncated.
1039 * IN assertions: the input file has already been open (ifd is set) and
1040 * ofname has already been updated if there was an original name.
1041 * OUT assertions: ifd and ofd are closed in case of error.
1043 local int create_outfile()
1045 int name_shortened = 0;
1046 int flags = (O_WRONLY | O_CREAT | O_EXCL
1047 | (ascii && decompress ? 0 : O_BINARY));
1048 char const *base = ofname;
1049 int atfd = AT_FDCWD;
1053 char const *b = last_component (ofname);
1054 int f = atdir_set (ofname, b - ofname);
1067 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
1068 remove_ofname_fd = ofd = openat (atfd, base, flags, S_IRUSR | S_IWUSR);
1070 sigprocmask (SIG_SETMASK, &oldset, NULL);
1079 shorten_name (ofname);
1085 if (check_ofname () != OK)
1099 if (name_shortened && decompress)
1101 /* name might be too long if an original name was saved */
1102 WARN ((stderr, "%s: %s: warning, name truncated\n",
1103 program_name, ofname));
1109 /* ========================================================================
1110 * Return a pointer to the 'z' suffix of a file name, or NULL. For all
1111 * systems, ".gz", ".z", ".Z", ".taz", ".tgz", "-gz", "-z" and "_z" are
1112 * accepted suffixes, in addition to the value of the --suffix option.
1113 * ".tgz" is a useful convention for tar.z files on systems limited
1114 * to 3 characters extensions. On such systems, ".?z" and ".??z" are
1115 * also accepted suffixes. For Unix, we do not want to accept any
1116 * .??z suffix as indicating a compressed file; some people use .xyz
1117 * to denote volume data.
1118 * On systems allowing multiple versions of the same file (such as VMS),
1119 * this function removes any version suffix in the given name.
1121 local char *get_suffix(name)
1125 char suffix[MAX_SUFFIX+3]; /* last chars of name, forced to lower case */
1126 static char const *known_suffixes[] =
1127 {NULL, ".gz", ".z", ".taz", ".tgz", "-gz", "-z", "_z",
1128 #ifdef MAX_EXT_CHARS
1133 bool suffix_of_builtin = false;
1135 /* Normally put Z_SUFFIX at the start of KNOWN_SUFFIXES, but if it
1136 is a suffix of one of them, put it at the end. */
1137 for (suf = known_suffixes + 1; *suf; suf++)
1139 size_t suflen = strlen (*suf);
1140 if (z_len < suflen && strequ (z_suffix, *suf + suflen - z_len))
1142 suffix_of_builtin = true;
1146 known_suffixes[suffix_of_builtin
1147 ? sizeof known_suffixes / sizeof *known_suffixes - 2
1149 suf = known_suffixes + suffix_of_builtin;
1152 /* strip a version number from the file name */
1154 char *v = strrchr(name, SUFFIX_SEP);
1155 if (v != NULL) *v = '\0';
1158 nlen = strlen(name);
1159 if (nlen <= MAX_SUFFIX+2) {
1160 strcpy(suffix, name);
1162 strcpy(suffix, name+nlen-MAX_SUFFIX-2);
1165 slen = strlen(suffix);
1167 int s = strlen(*suf);
1168 if (slen > s && suffix[slen-s-1] != PATH_SEP
1169 && strequ(suffix + slen - s, *suf)) {
1172 } while (*++suf != NULL);
1178 /* Open file NAME with the given flags and store its status
1179 into *ST. Return a file descriptor to the newly opened file, or -1
1180 (setting errno) on failure. */
1182 open_and_stat (char *name, int flags, struct stat *st)
1185 int atfd = AT_FDCWD;
1186 char const *base = name;
1188 /* Refuse to follow symbolic links unless -c or -f. */
1189 if (!to_stdout && !force)
1191 if (HAVE_WORKING_O_NOFOLLOW)
1192 flags |= O_NOFOLLOW;
1195 #if HAVE_LSTAT || defined lstat
1196 if (lstat (name, st) != 0)
1198 else if (S_ISLNK (st->st_mode))
1209 char const *b = last_component (name);
1210 int f = atdir_set (name, b - name);
1218 fd = openat (atfd, base, flags);
1219 if (0 <= fd && fstat (fd, st) != 0)
1230 /* ========================================================================
1231 * Set ifname to the input file name (with a suffix appended if necessary)
1232 * and istat to its stats. For decompression, if no file exists with the
1233 * original name, try adding successively z_suffix, .gz, .z, -z and .Z.
1234 * For MSDOS, we try only z_suffix and z.
1235 * Return an open file descriptor or -1.
1238 open_input_file (iname, sbuf)
1242 int ilen; /* strlen(ifname) */
1243 int z_suffix_errno = 0;
1244 static char const *suffixes[] = {NULL, ".gz", ".z", "-z", ".Z", NULL};
1245 char const **suf = suffixes;
1247 #ifdef NO_MULTIPLE_DOTS
1248 char *dot; /* pointer to ifname extension, or NULL */
1251 int open_flags = (O_RDONLY | O_NONBLOCK | O_NOCTTY
1252 | (ascii && !decompress ? 0 : O_BINARY));
1256 if (sizeof ifname - 1 <= strlen (iname))
1259 strcpy(ifname, iname);
1261 /* If input file exists, return OK. */
1262 fd = open_and_stat (ifname, open_flags, sbuf);
1266 if (!decompress || errno != ENOENT) {
1270 /* file.ext doesn't exist, try adding a suffix (after removing any
1271 * version number for VMS).
1273 s = get_suffix(ifname);
1275 progerror(ifname); /* ifname already has z suffix and does not exist */
1278 #ifdef NO_MULTIPLE_DOTS
1279 dot = strrchr(ifname, '.');
1281 strcat(ifname, ".");
1282 dot = strrchr(ifname, '.');
1285 ilen = strlen(ifname);
1286 if (strequ(z_suffix, ".gz")) suf++;
1288 /* Search for all suffixes */
1290 char const *s0 = s = *suf;
1291 strcpy (ifname, iname);
1292 #ifdef NO_MULTIPLE_DOTS
1294 if (*dot == '\0') strcpy (dot, ".");
1296 #ifdef MAX_EXT_CHARS
1297 if (MAX_EXT_CHARS < strlen (s) + strlen (dot + 1))
1298 dot[MAX_EXT_CHARS + 1 - strlen (s)] = '\0';
1300 if (sizeof ifname <= ilen + strlen (s))
1303 fd = open_and_stat (ifname, open_flags, sbuf);
1306 if (errno != ENOENT)
1311 if (strequ (s0, z_suffix))
1312 z_suffix_errno = errno;
1313 } while (*++suf != NULL);
1315 /* No suffix found, complain using z_suffix: */
1316 strcpy(ifname, iname);
1317 #ifdef NO_MULTIPLE_DOTS
1318 if (*dot == '\0') strcpy(dot, ".");
1320 #ifdef MAX_EXT_CHARS
1321 if (MAX_EXT_CHARS < z_len + strlen (dot + 1))
1322 dot[MAX_EXT_CHARS + 1 - z_len] = '\0';
1324 strcat(ifname, z_suffix);
1325 errno = z_suffix_errno;
1330 fprintf (stderr, "%s: %s: file name too long\n", program_name, iname);
1335 /* ========================================================================
1336 * Generate ofname given ifname. Return OK, or WARNING if file must be skipped.
1337 * Sets save_orig_name to true if the file name has been truncated.
1339 local int make_ofname()
1341 char *suff; /* ofname z suffix */
1343 strcpy(ofname, ifname);
1344 /* strip a version number if any and get the gzip suffix if present: */
1345 suff = get_suffix(ofname);
1349 /* With -t or -l, try all files (even without .gz suffix)
1350 * except with -r (behave as with just -dr).
1352 if (!recursive && (list || test)) return OK;
1354 /* Avoid annoying messages with -r */
1355 if (verbose || (!recursive && !quiet)) {
1356 WARN((stderr,"%s: %s: unknown suffix -- ignored\n",
1357 program_name, ifname));
1361 /* Make a special case for .tgz and .taz: */
1363 if (strequ(suff, ".tgz") || strequ(suff, ".taz")) {
1364 strcpy(suff, ".tar");
1366 *suff = '\0'; /* strip the z suffix */
1368 /* ofname might be changed later if infile contains an original name */
1370 } else if (suff && ! force) {
1371 /* Avoid annoying messages with -r (see treat_dir()) */
1372 if (verbose || (!recursive && !quiet)) {
1373 /* Don't use WARN, as it affects exit status. */
1374 fprintf (stderr, "%s: %s already has %s suffix -- unchanged\n",
1375 program_name, ifname, suff);
1381 #ifdef NO_MULTIPLE_DOTS
1382 suff = strrchr(ofname, '.');
1384 if (sizeof ofname <= strlen (ofname) + 1)
1386 strcat(ofname, ".");
1387 # ifdef MAX_EXT_CHARS
1388 if (strequ(z_suffix, "z")) {
1389 if (sizeof ofname <= strlen (ofname) + 2)
1391 strcat(ofname, "gz"); /* enough room */
1394 /* On the Atari and some versions of MSDOS,
1395 * ENAMETOOLONG does not work correctly. So we
1396 * must truncate here.
1398 } else if (strlen(suff)-1 + z_len > MAX_SUFFIX) {
1399 suff[MAX_SUFFIX+1-z_len] = '\0';
1403 #endif /* NO_MULTIPLE_DOTS */
1404 if (sizeof ofname <= strlen (ofname) + z_len)
1406 strcat(ofname, z_suffix);
1408 } /* decompress ? */
1412 WARN ((stderr, "%s: %s: file name too long\n", program_name, ifname));
1416 /* Discard NBYTES input bytes from the input, or up through the next
1417 zero byte if NBYTES == (size_t) -1. If FLAGS say that the header
1418 CRC should be computed, update the CRC accordingly. */
1420 discard_input_bytes (nbytes, flags)
1426 uch c = get_byte ();
1427 if (flags & HEADER_CRC)
1429 if (nbytes != (size_t) -1)
1436 /* ========================================================================
1437 * Check the magic number of the input file and update ofname if an
1438 * original name was given and to_stdout is not set.
1439 * Return the compression method, -1 for error, -2 for warning.
1440 * Set inptr to the offset of the next byte to be processed.
1441 * Updates time_stamp if there is one and --no-time is not used.
1442 * This function may be called repeatedly for an input file consisting
1443 * of several contiguous gzip'ed members.
1444 * IN assertions: there is at least one remaining compressed member.
1445 * If the member is a zip file, it must be the only one.
1447 local int get_method(in)
1448 int in; /* input file descriptor */
1450 uch flags; /* compression flags */
1451 uch magic[10]; /* magic header */
1452 int imagic0; /* first magic byte or EOF */
1453 int imagic1; /* like magic[1], but can represent EOF */
1454 ulg stamp; /* time stamp */
1456 /* If --force and --stdout, zcat == cat, so do not complain about
1457 * premature end of file: use try_byte instead of get_byte.
1459 if (force && to_stdout) {
1460 imagic0 = try_byte();
1462 imagic1 = try_byte ();
1464 /* If try_byte returned EOF, magic[1] == (char) EOF. */
1466 magic[0] = get_byte ();
1469 magic[1] = get_byte ();
1470 imagic1 = 0; /* avoid lint warning */
1472 imagic1 = try_byte ();
1476 method = -1; /* unknown yet */
1477 part_nb++; /* number of parts in gzip file */
1479 last_member = RECORD_IO;
1480 /* assume multiple members in gzip file except for record oriented I/O */
1482 if (memcmp(magic, GZIP_MAGIC, 2) == 0
1483 || memcmp(magic, OLD_GZIP_MAGIC, 2) == 0) {
1485 method = (int)get_byte();
1486 if (method != DEFLATED) {
1488 "%s: %s: unknown method %d -- not supported\n",
1489 program_name, ifname, method);
1494 flags = (uch)get_byte();
1496 if ((flags & ENCRYPTED) != 0) {
1498 "%s: %s is encrypted -- not supported\n",
1499 program_name, ifname);
1503 if ((flags & RESERVED) != 0) {
1505 "%s: %s has flags 0x%x -- not supported\n",
1506 program_name, ifname, flags);
1508 if (force <= 1) return -1;
1510 stamp = (ulg)get_byte();
1511 stamp |= ((ulg)get_byte()) << 8;
1512 stamp |= ((ulg)get_byte()) << 16;
1513 stamp |= ((ulg)get_byte()) << 24;
1514 if (stamp != 0 && !no_time)
1516 time_stamp.tv_sec = stamp;
1517 time_stamp.tv_nsec = 0;
1520 magic[8] = get_byte (); /* Ignore extra flags. */
1521 magic[9] = get_byte (); /* Ignore OS type. */
1523 if (flags & HEADER_CRC)
1525 magic[2] = DEFLATED;
1527 magic[4] = stamp & 0xff;
1528 magic[5] = (stamp >> 8) & 0xff;
1529 magic[6] = (stamp >> 16) & 0xff;
1530 magic[7] = stamp >> 24;
1535 if ((flags & EXTRA_FIELD) != 0) {
1537 unsigned int len = lenbuf[0] = get_byte ();
1538 len |= (lenbuf[1] = get_byte ()) << 8;
1540 fprintf(stderr,"%s: %s: extra field of %u bytes ignored\n",
1541 program_name, ifname, len);
1543 if (flags & HEADER_CRC)
1545 discard_input_bytes (len, flags);
1548 /* Get original file name if it was truncated */
1549 if ((flags & ORIG_NAME) != 0) {
1550 if (no_name || (to_stdout && !list) || part_nb > 1) {
1551 /* Discard the old name */
1552 discard_input_bytes (-1, flags);
1554 /* Copy the base name. Keep a directory prefix intact. */
1555 char *p = gzip_base_name (ofname);
1558 *p = (char) get_byte ();
1559 if (*p++ == '\0') break;
1560 if (p >= ofname+sizeof(ofname)) {
1561 gzip_error ("corrupted input -- file name too large");
1564 if (flags & HEADER_CRC)
1565 updcrc ((uch *) base, p - base);
1566 p = gzip_base_name (base);
1567 memmove (base, p, strlen (p) + 1);
1568 /* If necessary, adapt the name to local OS conventions: */
1570 MAKE_LEGAL_NAME(base);
1571 if (base) list=0; /* avoid warning about unused variable */
1573 } /* no_name || to_stdout */
1576 /* Discard file comment if any */
1577 if ((flags & COMMENT) != 0) {
1578 discard_input_bytes (-1, flags);
1581 if (flags & HEADER_CRC)
1583 unsigned int crc16 = updcrc (magic, 0) & 0xffff;
1584 unsigned int header16 = get_byte ();
1585 header16 |= ((unsigned int) get_byte ()) << 8;
1586 if (header16 != crc16)
1589 "%s: %s: header checksum 0x%04x != computed checksum 0x%04x\n",
1590 program_name, ifname, header16, crc16);
1598 header_bytes = inptr + 2*4; /* include crc and size */
1601 } else if (memcmp(magic, PKZIP_MAGIC, 2) == 0 && inptr == 2
1602 && memcmp((char*)inbuf, PKZIP_MAGIC, 4) == 0) {
1603 /* To simplify the code, we support a zip file when alone only.
1604 * We are thus guaranteed that the entire local header fits in inbuf.
1608 if (check_zipfile(in) != OK) return -1;
1609 /* check_zipfile may get ofname from the local header */
1612 } else if (memcmp(magic, PACK_MAGIC, 2) == 0) {
1616 } else if (memcmp(magic, LZW_MAGIC, 2) == 0) {
1618 method = COMPRESSED;
1621 } else if (memcmp(magic, LZH_MAGIC, 2) == 0) {
1626 } else if (force && to_stdout && !list) { /* pass input unchanged */
1632 if (imagic0 != EOF) {
1633 write_buf(fileno(stdout), magic, 1);
1637 if (method >= 0) return method;
1640 fprintf (stderr, "\n%s: %s: not in gzip format\n",
1641 program_name, ifname);
1648 for (inbyte = imagic1; inbyte == 0; inbyte = try_byte ())
1653 WARN ((stderr, "\n%s: %s: decompression OK, trailing zero bytes ignored\n",
1654 program_name, ifname));
1659 WARN((stderr, "\n%s: %s: decompression OK, trailing garbage ignored\n",
1660 program_name, ifname));
1665 /* ========================================================================
1666 * Display the characteristics of the compressed file.
1667 * If the given method is < 0, display the accumulated totals.
1668 * IN assertions: time_stamp, header_bytes and ifile_size are initialized.
1670 local void do_list(ifd, method)
1671 int ifd; /* input file descriptor */
1672 int method; /* compression method */
1674 ulg crc; /* original crc */
1675 static int first_time = 1;
1676 static char const *const methods[MAX_METHODS] = {
1681 "", "", "", "", /* 4 to 7 reserved */
1683 int positive_off_t_width = 1;
1686 for (o = OFF_T_MAX; 9 < o; o /= 10) {
1687 positive_off_t_width++;
1690 if (first_time && method >= 0) {
1693 printf("method crc date time ");
1696 printf("%*.*s %*.*s ratio uncompressed_name\n",
1697 positive_off_t_width, positive_off_t_width, "compressed",
1698 positive_off_t_width, positive_off_t_width, "uncompressed");
1700 } else if (method < 0) {
1701 if (total_in <= 0 || total_out <= 0) return;
1705 if (verbose || !quiet) {
1706 fprint_off(stdout, total_in, positive_off_t_width);
1708 fprint_off(stdout, total_out, positive_off_t_width);
1711 display_ratio(total_out-(total_in-header_bytes), total_out, stdout);
1712 /* header_bytes is not meaningful but used to ensure the same
1713 * ratio if there is a single file.
1715 printf(" (totals)\n");
1718 crc = (ulg)~0; /* unknown */
1720 bytes_in = ifile_size;
1722 if (!RECORD_IO && method == DEFLATED && !last_member) {
1723 /* Get the crc and uncompressed size for gzip'ed (not zip'ed) files.
1724 * If the lseek fails, we could use read() to get to the end, but
1725 * --list is used to get quick results.
1726 * Use "gunzip < foo.gz | wc -c" to get the uncompressed size if
1727 * you are not concerned about speed.
1729 bytes_in = lseek(ifd, (off_t)(-8), SEEK_END);
1730 if (bytes_in != -1L) {
1733 if (read(ifd, (char*)buf, sizeof(buf)) != sizeof(buf)) {
1737 bytes_out = LG(buf+4);
1743 struct tm *tm = localtime (&time_stamp.tv_sec);
1744 printf ("%5s %08lx ", methods[method], crc);
1746 printf ("%s%3d %02d:%02d ",
1747 ("Jan\0Feb\0Mar\0Apr\0May\0Jun\0Jul\0Aug\0Sep\0Oct\0Nov\0Dec"
1749 tm->tm_mday, tm->tm_hour, tm->tm_min);
1751 printf ("??? ?? ??:?? ");
1753 fprint_off(stdout, bytes_in, positive_off_t_width);
1755 fprint_off(stdout, bytes_out, positive_off_t_width);
1757 if (bytes_in == -1L) {
1759 bytes_in = bytes_out = header_bytes = 0;
1760 } else if (total_in >= 0) {
1761 total_in += bytes_in;
1763 if (bytes_out == -1L) {
1765 bytes_in = bytes_out = header_bytes = 0;
1766 } else if (total_out >= 0) {
1767 total_out += bytes_out;
1769 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out, stdout);
1770 printf(" %s\n", ofname);
1773 /* ========================================================================
1774 * Shorten the given name by one character, or replace a .tar extension
1775 * with .tgz. Truncate the last part of the name which is longer than
1776 * MIN_PART characters: 1234.678.012.gz -> 123.678.012.gz. If the name
1777 * has only parts shorter than MIN_PART truncate the longest part.
1778 * For decompression, just remove the last character of the name.
1780 * IN assertion: for compression, the suffix of the given name is z_suffix.
1782 local void shorten_name(name)
1785 int len; /* length of name without z_suffix */
1786 char *trunc = NULL; /* character to be truncated */
1787 int plen; /* current part length */
1788 int min_part = MIN_PART; /* current minimum part length */
1794 gzip_error ("name too short");
1798 p = get_suffix(name);
1800 gzip_error ("can't recover suffix\n");
1804 /* compress 1234567890.tar to 1234567890.tgz */
1805 if (len > 4 && strequ(p-4, ".tar")) {
1806 strcpy(p-4, ".tgz");
1809 /* Try keeping short extensions intact:
1810 * 1234.678.012.gz -> 123.678.012.gz
1813 p = strrchr(name, PATH_SEP);
1816 plen = strcspn(p, PART_SEP);
1818 if (plen > min_part) trunc = p-1;
1821 } while (trunc == NULL && --min_part != 0);
1823 if (trunc != NULL) {
1825 trunc[0] = trunc[1];
1829 trunc = strrchr(name, PART_SEP[0]);
1831 gzip_error ("internal error in shorten_name");
1832 if (trunc[1] == '\0') trunc--; /* force truncation */
1834 strcpy(trunc, z_suffix);
1837 /* ========================================================================
1838 * The compressed file already exists, so ask for confirmation.
1839 * Return ERROR if the file must be skipped.
1841 local int check_ofname()
1843 /* Ask permission to overwrite the existing file */
1846 fprintf (stderr, "%s: %s already exists;", program_name, ofname);
1847 if (foreground && (presume_input_tty || isatty(fileno(stdin)))) {
1848 fprintf(stderr, " do you wish to overwrite (y or n)? ");
1853 fprintf(stderr, "\tnot overwritten\n");
1854 if (exit_code == OK) exit_code = WARNING;
1858 if (xunlink (ofname)) {
1865 /* Change the owner and group of a file. FD is a file descriptor for
1866 the file and NAME its name. Change it to user UID and to group GID.
1867 If UID or GID is -1, though, do not change the corresponding user
1870 do_chown (int fd, char const *name, uid_t uid, gid_t gid)
1874 ignore_value (fchown (fd, uid, gid));
1876 ignore_value (chown (name, uid, gid));
1881 /* ========================================================================
1882 * Copy modes, times, ownership from input file to output file.
1883 * IN assertion: to_stdout is false.
1885 local void copy_stat(ifstat)
1886 struct stat *ifstat;
1888 mode_t mode = ifstat->st_mode & S_IRWXUGO;
1892 struct timespec timespec[2];
1893 timespec[0] = get_stat_atime (ifstat);
1894 timespec[1] = get_stat_mtime (ifstat);
1896 if (decompress && 0 <= time_stamp.tv_nsec
1897 && ! (timespec[1].tv_sec == time_stamp.tv_sec
1898 && timespec[1].tv_nsec == time_stamp.tv_nsec))
1900 timespec[1] = time_stamp;
1902 fprintf(stderr, "%s: time stamp restored\n", ofname);
1906 if (fdutimens (ofd, ofname, timespec) != 0)
1909 WARN ((stderr, "%s: ", program_name));
1918 /* Change the group first, then the permissions, then the owner.
1919 That way, the permissions will be correct on systems that allow
1920 users to give away files, without introducing a security hole.
1921 Security depends on permissions not containing the setuid or
1924 do_chown (ofd, ofname, -1, ifstat->st_gid);
1927 r = fchmod (ofd, mode);
1929 r = chmod (ofname, mode);
1933 WARN ((stderr, "%s: ", program_name));
1940 do_chown (ofd, ofname, ifstat->st_uid, -1);
1945 /* ========================================================================
1946 * Recurse through the given directory.
1948 local void treat_dir (fd, dir)
1953 char nbuf[MAX_PATH_LEN];
1958 dirp = fdopendir (fd);
1966 entries = streamsavedir (dirp, SAVEDIR_SORT_NONE);
1969 if (closedir (dirp) != 0)
1974 for (entry = entries; *entry; entry += entrylen + 1) {
1975 size_t len = strlen (dir);
1976 entrylen = strlen (entry);
1977 if (strequ (entry, ".") || strequ (entry, ".."))
1979 if (len + entrylen < MAX_PATH_LEN - 2) {
1981 if (len != 0 /* dir = "" means current dir on Amiga */
1983 && dir[len-1] != PATH_SEP2
1986 && dir[len-1] != PATH_SEP3
1989 nbuf[len++] = PATH_SEP;
1991 strcpy (nbuf + len, entry);
1994 fprintf(stderr,"%s: %s/%s: pathname too long\n",
1995 program_name, dir, entry);
2001 #endif /* ! NO_DIR */
2003 /* Make sure signals get handled properly. */
2006 install_signal_handlers ()
2008 int nsigs = sizeof handled_sig / sizeof handled_sig[0];
2012 struct sigaction act;
2014 sigemptyset (&caught_signals);
2015 for (i = 0; i < nsigs; i++)
2017 sigaction (handled_sig[i], NULL, &act);
2018 if (act.sa_handler != SIG_IGN)
2019 sigaddset (&caught_signals, handled_sig[i]);
2022 act.sa_handler = abort_gzip_signal;
2023 act.sa_mask = caught_signals;
2026 for (i = 0; i < nsigs; i++)
2027 if (sigismember (&caught_signals, handled_sig[i]))
2031 sigaction (handled_sig[i], &act, NULL);
2034 for (i = 0; i < nsigs; i++)
2035 if (signal (handled_sig[i], SIG_IGN) != SIG_IGN)
2039 signal (handled_sig[i], abort_gzip_signal);
2040 siginterrupt (handled_sig[i], 1);
2045 /* ========================================================================
2046 * Free all dynamically allocated variables and exit with the given code.
2048 local void do_exit(exitcode)
2051 static int in_exit = 0;
2053 if (in_exit) exit(exitcode);
2070 /* ========================================================================
2071 * Close and unlink the output file.
2074 remove_output_file ()
2079 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
2080 fd = remove_ofname_fd;
2083 remove_ofname_fd = -1;
2087 sigprocmask (SIG_SETMASK, &oldset, NULL);
2090 /* ========================================================================
2096 remove_output_file ();
2100 /* ========================================================================
2104 abort_gzip_signal (sig)
2108 signal (sig, SIG_IGN);
2109 remove_output_file ();
2110 if (sig == exiting_signal)
2112 signal (sig, SIG_DFL);