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>
73 #include "fcntl-safer.h"
75 #include "ignore-value.h"
76 #include "stat-time.h"
100 #define RW_USER (S_IRUSR | S_IWUSR) /* creation mode for open() */
103 # define MAX_PATH_LEN 1024 /* max pathname length */
115 off_t lseek (int fd, off_t offset, int whence);
119 # define OFF_T_MAX TYPE_MAXIMUM (off_t)
122 /* Use SA_NOCLDSTOP as a proxy for whether the sigaction machinery is
125 # define SA_NOCLDSTOP 0
126 # define sigprocmask(how, set, oset) /* empty */
127 # define sigset_t int
128 # if ! HAVE_SIGINTERRUPT
129 # define siginterrupt(sig, flag) /* empty */
133 #ifndef HAVE_WORKING_O_NOFOLLOW
134 # define HAVE_WORKING_O_NOFOLLOW 0
137 /* Separator for file name parts (see shorten_name()) */
138 #ifdef NO_MULTIPLE_DOTS
139 # define PART_SEP "-"
141 # define PART_SEP "."
146 DECLARE(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
147 DECLARE(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
148 DECLARE(ush, d_buf, DIST_BUFSIZE);
149 DECLARE(uch, window, 2L*WSIZE);
151 DECLARE(ush, tab_prefix, 1L<<BITS);
153 DECLARE(ush, tab_prefix0, 1L<<(BITS-1));
154 DECLARE(ush, tab_prefix1, 1L<<(BITS-1));
157 /* local variables */
159 /* If true, pretend that standard input is a tty. This option
160 is deliberately not documented, and only for testing. */
161 static bool presume_input_tty;
163 static int ascii = 0; /* convert end-of-lines to local OS conventions */
164 int to_stdout = 0; /* output to stdout (-c) */
165 static int decompress = 0; /* decompress (-d) */
166 static int force = 0; /* don't ask questions, compress links (-f) */
167 static int keep = 0; /* keep (don't delete) input files */
168 static int no_name = -1; /* don't save or restore the original file name */
169 static int no_time = -1; /* don't save or restore the original file time */
170 static int recursive = 0; /* recurse through directories (-r) */
171 static int list = 0; /* list the file contents (-l) */
172 int verbose = 0; /* be verbose (-v) */
173 int quiet = 0; /* be very quiet (-q) */
174 static int do_lzw = 0; /* generate output compatible with old compress (-Z) */
175 int test = 0; /* test .gz file integrity */
176 static int foreground = 0; /* set if program run in foreground */
177 char *program_name; /* program name */
178 int maxbits = BITS; /* max bits per code for LZW */
179 int method = DEFLATED;/* compression method */
180 int level = 6; /* compression level */
181 int exit_code = OK; /* program exit code */
182 int save_orig_name; /* set if original name must be saved */
183 static int last_member; /* set for .zip and .Z files */
184 static int part_nb; /* number of parts in .gz file */
185 struct timespec time_stamp; /* original time stamp (modification time) */
186 off_t ifile_size; /* input file size, -1 for devices (debug only) */
187 static char *env; /* contents of GZIP env variable */
188 static char const *z_suffix; /* default suffix (can be set with --suffix) */
189 static size_t z_len; /* strlen(z_suffix) */
191 /* The set of signals that are caught. */
192 static sigset_t caught_signals;
194 /* If nonzero then exit with status WARNING, rather than with the usual
195 signal status, on receipt of a signal with this value. This
196 suppresses a "Broken Pipe" message with some shells. */
197 static int volatile exiting_signal;
199 /* If nonnegative, close this file descriptor and unlink ofname on error. */
200 static int volatile remove_ofname_fd = -1;
202 off_t bytes_in; /* number of input bytes */
203 off_t bytes_out; /* number of output bytes */
204 static off_t total_in; /* input bytes for all files */
205 static off_t total_out; /* output bytes for all files */
206 char ifname[MAX_PATH_LEN]; /* input file name */
207 char ofname[MAX_PATH_LEN]; /* output file name */
208 static struct stat istat; /* status for input file */
209 int ifd; /* input file descriptor */
210 int ofd; /* output file descriptor */
211 unsigned insize; /* valid bytes in inbuf */
212 unsigned inptr; /* index of next byte to be processed in inbuf */
213 unsigned outcnt; /* bytes in output buffer */
215 static int handled_sig[] =
217 /* SIGINT must be first, as 'foreground' depends on it. */
237 /* For long options that have no equivalent short option, use a
238 non-character as a pseudo short option, starting with CHAR_MAX + 1. */
241 PRESUME_INPUT_TTY_OPTION = CHAR_MAX + 1,
243 /* A value greater than all valid long options, used as a flag to
244 distinguish options derived from the GZIP environment variable. */
248 static char const shortopts[] = "ab:cdfhH?klLmMnNqrS:tvVZ123456789";
250 static const struct option longopts[] =
252 /* { name has_arg *flag val } */
253 {"ascii", 0, 0, 'a'}, /* ascii text mode */
254 {"to-stdout", 0, 0, 'c'}, /* write output on standard output */
255 {"stdout", 0, 0, 'c'}, /* write output on standard output */
256 {"decompress", 0, 0, 'd'}, /* decompress */
257 {"uncompress", 0, 0, 'd'}, /* decompress */
258 /* {"encrypt", 0, 0, 'e'}, encrypt */
259 {"force", 0, 0, 'f'}, /* force overwrite of output file */
260 {"help", 0, 0, 'h'}, /* give help */
261 /* {"pkzip", 0, 0, 'k'}, force output in pkzip format */
262 {"keep", 0, 0, 'k'}, /* keep (don't delete) input files */
263 {"list", 0, 0, 'l'}, /* list .gz file contents */
264 {"license", 0, 0, 'L'}, /* display software license */
265 {"no-name", 0, 0, 'n'}, /* don't save or restore original name & time */
266 {"name", 0, 0, 'N'}, /* save or restore original name & time */
267 {"-presume-input-tty", no_argument, NULL, PRESUME_INPUT_TTY_OPTION},
268 {"quiet", 0, 0, 'q'}, /* quiet mode */
269 {"silent", 0, 0, 'q'}, /* quiet mode */
270 {"recursive", 0, 0, 'r'}, /* recurse through directories */
271 {"suffix", 1, 0, 'S'}, /* use given suffix instead of .gz */
272 {"test", 0, 0, 't'}, /* test compressed file integrity */
273 {"no-time", 0, 0, 'T'}, /* don't save or restore the time stamp */
274 {"verbose", 0, 0, 'v'}, /* verbose mode */
275 {"version", 0, 0, 'V'}, /* display version number */
276 {"fast", 0, 0, '1'}, /* compress faster */
277 {"best", 0, 0, '9'}, /* compress better */
278 {"lzw", 0, 0, 'Z'}, /* make output compatible with old compress */
279 {"bits", 1, 0, 'b'}, /* max number of bits per code (implies -Z) */
284 /* local functions */
286 local void try_help (void) ATTRIBUTE_NORETURN;
287 local void help (void);
288 local void license (void);
289 local void version (void);
290 local int input_eof (void);
291 local void treat_stdin (void);
292 local void treat_file (char *iname);
293 local int create_outfile (void);
294 local char *get_suffix (char *name);
295 local int open_input_file (char *iname, struct stat *sbuf);
296 local void discard_input_bytes (size_t nbytes, unsigned int flags);
297 local int make_ofname (void);
298 local void shorten_name (char *name);
299 local int get_method (int in);
300 local void do_list (int ifd, int method);
301 local int check_ofname (void);
302 local void copy_stat (struct stat *ifstat);
303 local void install_signal_handlers (void);
304 local void remove_output_file (void);
305 local RETSIGTYPE abort_gzip_signal (int);
306 local void do_exit (int exitcode) ATTRIBUTE_NORETURN;
307 int main (int argc, char **argv);
308 static int (*work) (int infile, int outfile) = zip; /* function to call */
311 local void treat_dir (int fd, char *dir);
314 #define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
319 fprintf (stderr, "Try `%s --help' for more information.\n",
324 /* ======================================================================== */
327 static char const* const help_msg[] = {
328 "Compress or uncompress FILEs (by default, compress FILES in-place).",
330 "Mandatory arguments to long options are mandatory for short options too.",
333 " -a, --ascii ascii text; convert end-of-line using local conventions",
335 " -c, --stdout write on standard output, keep original files unchanged",
336 " -d, --decompress decompress",
337 /* -e, --encrypt encrypt */
338 " -f, --force force overwrite of output file and compress links",
339 " -h, --help give this help",
340 /* -k, --pkzip force output in pkzip format */
341 " -k, --keep keep (don't delete) input files",
342 " -l, --list list compressed file contents",
343 " -L, --license display software license",
345 " -m, --no-time do not save or restore the original modification time",
346 " -M, --time save or restore the original modification time",
348 " -n, --no-name do not save or restore the original name and time stamp",
349 " -N, --name save or restore the original name and time stamp",
350 " -q, --quiet suppress all warnings",
352 " -r, --recursive operate recursively on directories",
354 " -S, --suffix=SUF use suffix SUF on compressed files",
355 " -t, --test test compressed file integrity",
356 " -v, --verbose verbose mode",
357 " -V, --version display version number",
358 " -1, --fast compress faster",
359 " -9, --best compress better",
361 " -Z, --lzw produce output compatible with old compress",
362 " -b, --bits=BITS max number of bits per code (implies -Z)",
365 "With no FILE, or when FILE is -, read standard input.",
367 "Report bugs to <bug-gzip@gnu.org>.",
369 char const *const *p = help_msg;
371 printf ("Usage: %s [OPTION]... [FILE]...\n", program_name);
372 while (*p) printf ("%s\n", *p++);
375 /* ======================================================================== */
378 char const *const *p = license_msg;
380 printf ("%s %s\n", program_name, Version);
381 while (*p) printf ("%s\n", *p++);
384 /* ======================================================================== */
389 printf ("Written by Jean-loup Gailly.\n");
392 local void progerror (char const *string)
395 fprintf (stderr, "%s: ", program_name);
401 /* ======================================================================== */
402 int main (int argc, char **argv)
404 int file_count; /* number of files to process */
405 size_t proglen; /* length of program_name */
410 EXPAND(argc, argv); /* wild card expansion if necessary */
412 program_name = gzip_base_name (argv[0]);
413 proglen = strlen (program_name);
415 atexit (close_stdin);
417 /* Suppress .exe for MSDOS, OS/2 and VMS: */
418 if (4 < proglen && strequ (program_name + proglen - 4, ".exe"))
419 program_name[proglen - 4] = '\0';
421 /* Add options in GZIP environment variable if there is one */
423 env = add_envopt (&env_argc, &argv_copy, OPTIONS_VAR);
424 env_argv = env ? argv_copy : NULL;
427 # define GNU_STANDARD 1
430 /* For compatibility with old compress, use program name as an option.
431 * Unless you compile with -DGNU_STANDARD=0, this program will behave as
432 * gzip even if it is invoked under the name gunzip or zcat.
434 * Systems which do not support links can still use -d or -dc.
435 * Ignore an .exe extension for MSDOS, OS/2 and VMS.
437 if (strncmp (program_name, "un", 2) == 0 /* ungzip, uncompress */
438 || strncmp (program_name, "gun", 3) == 0) /* gunzip */
440 else if (strequ (program_name + 1, "cat") /* zcat, pcat, gcat */
441 || strequ (program_name, "gzcat")) /* gzcat */
442 decompress = to_stdout = 1;
446 z_len = strlen(z_suffix);
454 if (env_argv[optind] && strequ (env_argv[optind], "--"))
455 optc = ENV_OPTION + '-';
458 optc = getopt_long (env_argc, env_argv, shortopts, longopts,
464 if (optind != env_argc)
467 ("%s: %s: non-option in "OPTIONS_VAR
468 " environment variable\n"),
469 program_name, env_argv[optind]);
473 /* Wait until here before warning, so that GZIP='-q'
475 if (env_argc != 1 && !quiet)
477 ("%s: warning: "OPTIONS_VAR" environment variable"
478 " is deprecated; use an alias or script\n"),
481 /* Start processing ARGC and ARGV instead. */
491 optc = getopt_long (argc, argv, shortopts, longopts, &longind);
499 maxbits = atoi(optarg);
500 for (; *optarg; optarg++)
501 if (! ('0' <= *optarg && *optarg <= '9'))
503 fprintf (stderr, "%s: -b operand is not an integer\n",
509 to_stdout = 1; break;
511 decompress = 1; break;
515 help(); do_exit(OK); break;
519 list = decompress = to_stdout = 1; break;
521 license(); do_exit(OK); break;
522 case 'm': /* undocumented, may change later */
524 case 'M': /* undocumented, may change later */
527 case 'n' + ENV_OPTION:
528 no_name = no_time = 1; break;
530 case 'N' + ENV_OPTION:
531 no_name = no_time = 0; break;
532 case PRESUME_INPUT_TTY_OPTION:
533 presume_input_tty = true; break;
535 case 'q' + ENV_OPTION:
536 quiet = 1; verbose = 0; break;
539 fprintf (stderr, "%s: -r not supported on this system\n",
547 #ifdef NO_MULTIPLE_DOTS
548 if (*optarg == '.') optarg++;
550 z_len = strlen(optarg);
554 test = decompress = to_stdout = 1;
557 case 'v' + ENV_OPTION:
558 verbose++; quiet = 0; break;
560 version(); do_exit(OK); break;
565 fprintf(stderr, "%s: -Z not supported in this version\n",
570 case '1' + ENV_OPTION: case '2' + ENV_OPTION: case '3' + ENV_OPTION:
571 case '4' + ENV_OPTION: case '5' + ENV_OPTION: case '6' + ENV_OPTION:
572 case '7' + ENV_OPTION: case '8' + ENV_OPTION: case '9' + ENV_OPTION:
575 case '1': case '2': case '3': case '4':
576 case '5': case '6': case '7': case '8': case '9':
581 if (ENV_OPTION <= optc && optc != ENV_OPTION + '?')
583 /* Output a diagnostic, since getopt_long didn't. */
584 fprintf (stderr, "%s: ", program_name);
586 fprintf (stderr, "-%c: ", optc - ENV_OPTION);
588 fprintf (stderr, "--%s: ", longopts[longind].name);
589 fprintf (stderr, ("option not valid in "OPTIONS_VAR
590 " environment variable\n"));
594 } /* loop on all arguments */
596 /* By default, save name and timestamp on compression but do not
597 * restore them on decompression.
599 if (no_time < 0) no_time = decompress;
600 if (no_name < 0) no_name = decompress;
602 file_count = argc - optind;
606 if (ascii && !quiet) {
607 fprintf(stderr, "%s: option --ascii ignored on this system\n",
611 if (z_len == 0 || z_len > MAX_SUFFIX) {
612 fprintf(stderr, "%s: invalid suffix '%s'\n", program_name, z_suffix);
616 if (do_lzw && !decompress) work = lzw;
618 /* Allocate all global buffers (for DYN_ALLOC option) */
619 ALLOC(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
620 ALLOC(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
621 ALLOC(ush, d_buf, DIST_BUFSIZE);
622 ALLOC(uch, window, 2L*WSIZE);
624 ALLOC(ush, tab_prefix, 1L<<BITS);
626 ALLOC(ush, tab_prefix0, 1L<<(BITS-1));
627 ALLOC(ush, tab_prefix1, 1L<<(BITS-1));
630 exiting_signal = quiet ? SIGPIPE : 0;
631 install_signal_handlers ();
633 /* And get to work */
634 if (file_count != 0) {
635 if (to_stdout && !test && !list && (!decompress || !ascii)) {
636 SET_BINARY_MODE(fileno(stdout));
638 while (optind < argc) {
639 treat_file(argv[optind++]);
641 } else { /* Standard input */
644 if (list && !quiet && file_count > 1) {
645 do_list(-1, -1); /* print totals */
648 return exit_code; /* just to avoid lint warning */
651 /* Return nonzero when at end of file on input. */
655 if (!decompress || last_member)
660 if (insize != INBUFSIZ || fill_inbuf (1) == EOF)
663 /* Unget the char that fill_inbuf got. */
670 /* ========================================================================
671 * Compress or decompress stdin
673 local void treat_stdin()
676 && (presume_input_tty
677 || isatty(fileno((FILE *)(decompress ? stdin : stdout))))) {
678 /* Do not send compressed data to the terminal or read it from
679 * the terminal. We get here when user invoked the program
680 * without parameters, so be helpful. According to the GNU standards:
682 * If there is one behavior you think is most useful when the output
683 * is to a terminal, and another that you think is most useful when
684 * the output is a file or a pipe, then it is usually best to make
685 * the default behavior the one that is useful with output to a
686 * terminal, and have an option for the other behavior.
688 * Here we use the --force option to get the other behavior.
692 ("%s: compressed data not %s a terminal."
693 " Use -f to force %scompression.\n"
694 "For help, type: %s -h\n"),
696 decompress ? "read from" : "written to",
697 decompress ? "de" : "",
702 if (decompress || !ascii) {
703 SET_BINARY_MODE(fileno(stdin));
705 if (!test && !list && (!decompress || !ascii)) {
706 SET_BINARY_MODE(fileno(stdout));
708 strcpy(ifname, "stdin");
709 strcpy(ofname, "stdout");
711 /* Get the file's time stamp and size. */
712 if (fstat (fileno (stdin), &istat) != 0)
714 progerror ("standard input");
717 ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1;
718 time_stamp.tv_nsec = -1;
719 if (!no_time || list)
721 if (S_ISREG (istat.st_mode))
722 time_stamp = get_stat_mtime (&istat);
724 gettime (&time_stamp);
727 clear_bufs(); /* clear input and output buffers */
733 method = get_method(ifd);
735 do_exit(exit_code); /* error message already emitted */
739 do_list(ifd, method);
743 /* Actually do the compression/decompression. Loop over zipped members.
746 if ((*work)(fileno(stdin), fileno(stdout)) != OK) return;
751 method = get_method(ifd);
752 if (method < 0) return; /* error message already emitted */
753 bytes_out = 0; /* required for length check */
758 fprintf(stderr, " OK\n");
760 } else if (!decompress) {
761 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
762 fprintf(stderr, "\n");
763 #ifdef DISPLAY_STDIN_RATIO
765 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
766 fprintf(stderr, "\n");
772 /* ========================================================================
773 * Compress or decompress the given file
775 local void treat_file(iname)
778 /* Accept "-" as synonym for stdin */
779 if (strequ(iname, "-")) {
780 int cflag = to_stdout;
786 /* Check if the input file is present, set ifname and istat: */
787 ifd = open_input_file (iname, &istat);
791 /* If the input name is that of a directory, recurse or ignore: */
792 if (S_ISDIR(istat.st_mode)) {
795 treat_dir (ifd, iname);
796 /* Warning: ifname is now garbage */
801 WARN ((stderr, "%s: %s is a directory -- ignored\n",
802 program_name, ifname));
808 if (! S_ISREG (istat.st_mode))
811 "%s: %s is not a directory or a regular file - ignored\n",
812 program_name, ifname));
816 if (istat.st_mode & S_ISUID)
818 WARN ((stderr, "%s: %s is set-user-ID on execution - ignored\n",
819 program_name, ifname));
823 if (istat.st_mode & S_ISGID)
825 WARN ((stderr, "%s: %s is set-group-ID on execution - ignored\n",
826 program_name, ifname));
833 if (istat.st_mode & S_ISVTX)
836 "%s: %s has the sticky bit set - file ignored\n",
837 program_name, ifname));
841 if (2 <= istat.st_nlink)
843 WARN ((stderr, "%s: %s has %lu other link%c -- unchanged\n",
844 program_name, ifname,
845 (unsigned long int) istat.st_nlink - 1,
846 istat.st_nlink == 2 ? ' ' : 's'));
853 ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1;
854 time_stamp.tv_nsec = -1;
855 if (!no_time || list)
856 time_stamp = get_stat_mtime (&istat);
858 /* Generate output file name. For -r and (-t or -l), skip files
859 * without a valid gzip suffix (check done in make_ofname).
861 if (to_stdout && !list && !test) {
862 strcpy(ofname, "stdout");
864 } else if (make_ofname() != OK) {
869 clear_bufs(); /* clear input and output buffers */
873 method = get_method(ifd); /* updates ofname if original given */
876 return; /* error message already emitted */
880 do_list(ifd, method);
881 if (close (ifd) != 0)
886 /* If compressing to a file, check if ofname is not ambiguous
887 * because the operating system truncates names. Otherwise, generate
888 * a new ofname and save the original name in the compressed file.
891 ofd = fileno(stdout);
892 /* Keep remove_ofname_fd negative. */
894 if (create_outfile() != OK) return;
896 if (!decompress && save_orig_name && !verbose && !quiet) {
897 fprintf(stderr, "%s: %s compressed to %s\n",
898 program_name, ifname, ofname);
901 /* Keep the name even if not truncated except with --no-name: */
902 if (!save_orig_name) save_orig_name = !no_name;
905 fprintf(stderr, "%s:\t", ifname);
908 /* Actually do the compression/decompression. Loop over zipped members.
911 if ((*work)(ifd, ofd) != OK) {
912 method = -1; /* force cleanup */
919 method = get_method(ifd);
920 if (method < 0) break; /* error message already emitted */
921 bytes_out = 0; /* required for length check */
924 if (close (ifd) != 0)
931 if (close (ofd) != 0)
939 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
940 remove_ofname_fd = -1;
941 unlink_errno = xunlink (ifname) == 0 ? 0 : errno;
942 sigprocmask (SIG_SETMASK, &oldset, NULL);
946 WARN ((stderr, "%s: ", program_name));
949 errno = unlink_errno;
958 remove_output_file ();
962 /* Display statistics */
965 fprintf(stderr, " OK");
966 } else if (decompress) {
967 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
969 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
971 if (!test && !to_stdout)
972 fprintf(stderr, " -- %s %s", keep ? "created" : "replaced with",
974 fprintf(stderr, "\n");
978 /* ========================================================================
979 * Create the output file. Return OK or ERROR.
980 * Try several times if necessary to avoid truncating the z_suffix. For
981 * example, do not create a compressed file of name "1234567890123."
982 * Sets save_orig_name to true if the file name has been truncated.
983 * IN assertions: the input file has already been open (ifd is set) and
984 * ofname has already been updated if there was an original name.
985 * OUT assertions: ifd and ofd are closed in case of error.
987 local int create_outfile()
989 int name_shortened = 0;
990 int flags = (O_WRONLY | O_CREAT | O_EXCL
991 | (ascii && decompress ? 0 : O_BINARY));
998 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
999 remove_ofname_fd = ofd = OPEN (ofname, flags, RW_USER);
1001 sigprocmask (SIG_SETMASK, &oldset, NULL);
1010 shorten_name (ofname);
1016 if (check_ofname () != OK)
1030 if (name_shortened && decompress)
1032 /* name might be too long if an original name was saved */
1033 WARN ((stderr, "%s: %s: warning, name truncated\n",
1034 program_name, ofname));
1040 /* ========================================================================
1041 * Return a pointer to the 'z' suffix of a file name, or NULL. For all
1042 * systems, ".gz", ".z", ".Z", ".taz", ".tgz", "-gz", "-z" and "_z" are
1043 * accepted suffixes, in addition to the value of the --suffix option.
1044 * ".tgz" is a useful convention for tar.z files on systems limited
1045 * to 3 characters extensions. On such systems, ".?z" and ".??z" are
1046 * also accepted suffixes. For Unix, we do not want to accept any
1047 * .??z suffix as indicating a compressed file; some people use .xyz
1048 * to denote volume data.
1049 * On systems allowing multiple versions of the same file (such as VMS),
1050 * this function removes any version suffix in the given name.
1052 local char *get_suffix(name)
1056 char suffix[MAX_SUFFIX+3]; /* last chars of name, forced to lower case */
1057 static char const *known_suffixes[] =
1058 {NULL, ".gz", ".z", ".taz", ".tgz", "-gz", "-z", "_z",
1059 #ifdef MAX_EXT_CHARS
1064 bool suffix_of_builtin = false;
1066 /* Normally put Z_SUFFIX at the start of KNOWN_SUFFIXES, but if it
1067 is a suffix of one of them, put it at the end. */
1068 for (suf = known_suffixes + 1; *suf; suf++)
1070 size_t suflen = strlen (*suf);
1071 if (z_len < suflen && strequ (z_suffix, *suf + suflen - z_len))
1073 suffix_of_builtin = true;
1077 known_suffixes[suffix_of_builtin
1078 ? sizeof known_suffixes / sizeof *known_suffixes - 2
1080 suf = known_suffixes + suffix_of_builtin;
1083 /* strip a version number from the file name */
1085 char *v = strrchr(name, SUFFIX_SEP);
1086 if (v != NULL) *v = '\0';
1089 nlen = strlen(name);
1090 if (nlen <= MAX_SUFFIX+2) {
1091 strcpy(suffix, name);
1093 strcpy(suffix, name+nlen-MAX_SUFFIX-2);
1096 slen = strlen(suffix);
1098 int s = strlen(*suf);
1099 if (slen > s && suffix[slen-s-1] != PATH_SEP
1100 && strequ(suffix + slen - s, *suf)) {
1103 } while (*++suf != NULL);
1109 /* Open file NAME with the given flags and mode and store its status
1110 into *ST. Return a file descriptor to the newly opened file, or -1
1111 (setting errno) on failure. */
1113 open_and_stat (char *name, int flags, mode_t mode, struct stat *st)
1117 /* Refuse to follow symbolic links unless -c or -f. */
1118 if (!to_stdout && !force)
1120 if (HAVE_WORKING_O_NOFOLLOW)
1121 flags |= O_NOFOLLOW;
1124 #if HAVE_LSTAT || defined lstat
1125 if (lstat (name, st) != 0)
1127 else if (S_ISLNK (st->st_mode))
1136 fd = OPEN (name, flags, mode);
1137 if (0 <= fd && fstat (fd, st) != 0)
1148 /* ========================================================================
1149 * Set ifname to the input file name (with a suffix appended if necessary)
1150 * and istat to its stats. For decompression, if no file exists with the
1151 * original name, try adding successively z_suffix, .gz, .z, -z and .Z.
1152 * For MSDOS, we try only z_suffix and z.
1153 * Return an open file descriptor or -1.
1156 open_input_file (iname, sbuf)
1160 int ilen; /* strlen(ifname) */
1161 int z_suffix_errno = 0;
1162 static char const *suffixes[] = {NULL, ".gz", ".z", "-z", ".Z", NULL};
1163 char const **suf = suffixes;
1165 #ifdef NO_MULTIPLE_DOTS
1166 char *dot; /* pointer to ifname extension, or NULL */
1169 int open_flags = (O_RDONLY | O_NONBLOCK | O_NOCTTY
1170 | (ascii && !decompress ? 0 : O_BINARY));
1174 if (sizeof ifname - 1 <= strlen (iname))
1177 strcpy(ifname, iname);
1179 /* If input file exists, return OK. */
1180 fd = open_and_stat (ifname, open_flags, RW_USER, sbuf);
1184 if (!decompress || errno != ENOENT) {
1188 /* file.ext doesn't exist, try adding a suffix (after removing any
1189 * version number for VMS).
1191 s = get_suffix(ifname);
1193 progerror(ifname); /* ifname already has z suffix and does not exist */
1196 #ifdef NO_MULTIPLE_DOTS
1197 dot = strrchr(ifname, '.');
1199 strcat(ifname, ".");
1200 dot = strrchr(ifname, '.');
1203 ilen = strlen(ifname);
1204 if (strequ(z_suffix, ".gz")) suf++;
1206 /* Search for all suffixes */
1208 char const *s0 = s = *suf;
1209 strcpy (ifname, iname);
1210 #ifdef NO_MULTIPLE_DOTS
1212 if (*dot == '\0') strcpy (dot, ".");
1214 #ifdef MAX_EXT_CHARS
1215 if (MAX_EXT_CHARS < strlen (s) + strlen (dot + 1))
1216 dot[MAX_EXT_CHARS + 1 - strlen (s)] = '\0';
1218 if (sizeof ifname <= ilen + strlen (s))
1221 fd = open_and_stat (ifname, open_flags, RW_USER, sbuf);
1224 if (errno != ENOENT)
1229 if (strequ (s0, z_suffix))
1230 z_suffix_errno = errno;
1231 } while (*++suf != NULL);
1233 /* No suffix found, complain using z_suffix: */
1234 strcpy(ifname, iname);
1235 #ifdef NO_MULTIPLE_DOTS
1236 if (*dot == '\0') strcpy(dot, ".");
1238 #ifdef MAX_EXT_CHARS
1239 if (MAX_EXT_CHARS < z_len + strlen (dot + 1))
1240 dot[MAX_EXT_CHARS + 1 - z_len] = '\0';
1242 strcat(ifname, z_suffix);
1243 errno = z_suffix_errno;
1248 fprintf (stderr, "%s: %s: file name too long\n", program_name, iname);
1253 /* ========================================================================
1254 * Generate ofname given ifname. Return OK, or WARNING if file must be skipped.
1255 * Sets save_orig_name to true if the file name has been truncated.
1257 local int make_ofname()
1259 char *suff; /* ofname z suffix */
1261 strcpy(ofname, ifname);
1262 /* strip a version number if any and get the gzip suffix if present: */
1263 suff = get_suffix(ofname);
1267 /* With -t or -l, try all files (even without .gz suffix)
1268 * except with -r (behave as with just -dr).
1270 if (!recursive && (list || test)) return OK;
1272 /* Avoid annoying messages with -r */
1273 if (verbose || (!recursive && !quiet)) {
1274 WARN((stderr,"%s: %s: unknown suffix -- ignored\n",
1275 program_name, ifname));
1279 /* Make a special case for .tgz and .taz: */
1281 if (strequ(suff, ".tgz") || strequ(suff, ".taz")) {
1282 strcpy(suff, ".tar");
1284 *suff = '\0'; /* strip the z suffix */
1286 /* ofname might be changed later if infile contains an original name */
1288 } else if (suff && ! force) {
1289 /* Avoid annoying messages with -r (see treat_dir()) */
1290 if (verbose || (!recursive && !quiet)) {
1291 /* Don't use WARN, as it affects exit status. */
1292 fprintf (stderr, "%s: %s already has %s suffix -- unchanged\n",
1293 program_name, ifname, suff);
1299 #ifdef NO_MULTIPLE_DOTS
1300 suff = strrchr(ofname, '.');
1302 if (sizeof ofname <= strlen (ofname) + 1)
1304 strcat(ofname, ".");
1305 # ifdef MAX_EXT_CHARS
1306 if (strequ(z_suffix, "z")) {
1307 if (sizeof ofname <= strlen (ofname) + 2)
1309 strcat(ofname, "gz"); /* enough room */
1312 /* On the Atari and some versions of MSDOS,
1313 * ENAMETOOLONG does not work correctly. So we
1314 * must truncate here.
1316 } else if (strlen(suff)-1 + z_len > MAX_SUFFIX) {
1317 suff[MAX_SUFFIX+1-z_len] = '\0';
1321 #endif /* NO_MULTIPLE_DOTS */
1322 if (sizeof ofname <= strlen (ofname) + z_len)
1324 strcat(ofname, z_suffix);
1326 } /* decompress ? */
1330 WARN ((stderr, "%s: %s: file name too long\n", program_name, ifname));
1334 /* Discard NBYTES input bytes from the input, or up through the next
1335 zero byte if NBYTES == (size_t) -1. If FLAGS say that the header
1336 CRC should be computed, update the CRC accordingly. */
1338 discard_input_bytes (nbytes, flags)
1344 uch c = get_byte ();
1345 if (flags & HEADER_CRC)
1347 if (nbytes != (size_t) -1)
1354 /* ========================================================================
1355 * Check the magic number of the input file and update ofname if an
1356 * original name was given and to_stdout is not set.
1357 * Return the compression method, -1 for error, -2 for warning.
1358 * Set inptr to the offset of the next byte to be processed.
1359 * Updates time_stamp if there is one and --no-time is not used.
1360 * This function may be called repeatedly for an input file consisting
1361 * of several contiguous gzip'ed members.
1362 * IN assertions: there is at least one remaining compressed member.
1363 * If the member is a zip file, it must be the only one.
1365 local int get_method(in)
1366 int in; /* input file descriptor */
1368 uch flags; /* compression flags */
1369 uch magic[10]; /* magic header */
1370 int imagic0; /* first magic byte or EOF */
1371 int imagic1; /* like magic[1], but can represent EOF */
1372 ulg stamp; /* time stamp */
1374 /* If --force and --stdout, zcat == cat, so do not complain about
1375 * premature end of file: use try_byte instead of get_byte.
1377 if (force && to_stdout) {
1378 imagic0 = try_byte();
1380 imagic1 = try_byte ();
1382 /* If try_byte returned EOF, magic[1] == (char) EOF. */
1384 magic[0] = get_byte ();
1387 magic[1] = get_byte ();
1388 imagic1 = 0; /* avoid lint warning */
1390 imagic1 = try_byte ();
1394 method = -1; /* unknown yet */
1395 part_nb++; /* number of parts in gzip file */
1397 last_member = RECORD_IO;
1398 /* assume multiple members in gzip file except for record oriented I/O */
1400 if (memcmp(magic, GZIP_MAGIC, 2) == 0
1401 || memcmp(magic, OLD_GZIP_MAGIC, 2) == 0) {
1403 method = (int)get_byte();
1404 if (method != DEFLATED) {
1406 "%s: %s: unknown method %d -- not supported\n",
1407 program_name, ifname, method);
1412 flags = (uch)get_byte();
1414 if ((flags & ENCRYPTED) != 0) {
1416 "%s: %s is encrypted -- not supported\n",
1417 program_name, ifname);
1421 if ((flags & RESERVED) != 0) {
1423 "%s: %s has flags 0x%x -- not supported\n",
1424 program_name, ifname, flags);
1426 if (force <= 1) return -1;
1428 stamp = (ulg)get_byte();
1429 stamp |= ((ulg)get_byte()) << 8;
1430 stamp |= ((ulg)get_byte()) << 16;
1431 stamp |= ((ulg)get_byte()) << 24;
1432 if (stamp != 0 && !no_time)
1434 time_stamp.tv_sec = stamp;
1435 time_stamp.tv_nsec = 0;
1438 magic[8] = get_byte (); /* Ignore extra flags. */
1439 magic[9] = get_byte (); /* Ignore OS type. */
1441 if (flags & HEADER_CRC)
1443 magic[2] = DEFLATED;
1445 magic[4] = stamp & 0xff;
1446 magic[5] = (stamp >> 8) & 0xff;
1447 magic[6] = (stamp >> 16) & 0xff;
1448 magic[7] = stamp >> 24;
1453 if ((flags & EXTRA_FIELD) != 0) {
1455 unsigned int len = lenbuf[0] = get_byte ();
1456 len |= (lenbuf[1] = get_byte ()) << 8;
1458 fprintf(stderr,"%s: %s: extra field of %u bytes ignored\n",
1459 program_name, ifname, len);
1461 if (flags & HEADER_CRC)
1463 discard_input_bytes (len, flags);
1466 /* Get original file name if it was truncated */
1467 if ((flags & ORIG_NAME) != 0) {
1468 if (no_name || (to_stdout && !list) || part_nb > 1) {
1469 /* Discard the old name */
1470 discard_input_bytes (-1, flags);
1472 /* Copy the base name. Keep a directory prefix intact. */
1473 char *p = gzip_base_name (ofname);
1476 *p = (char) get_byte ();
1477 if (*p++ == '\0') break;
1478 if (p >= ofname+sizeof(ofname)) {
1479 gzip_error ("corrupted input -- file name too large");
1482 if (flags & HEADER_CRC)
1483 updcrc ((uch *) base, p - base);
1484 p = gzip_base_name (base);
1485 memmove (base, p, strlen (p) + 1);
1486 /* If necessary, adapt the name to local OS conventions: */
1488 MAKE_LEGAL_NAME(base);
1489 if (base) list=0; /* avoid warning about unused variable */
1491 } /* no_name || to_stdout */
1494 /* Discard file comment if any */
1495 if ((flags & COMMENT) != 0) {
1496 discard_input_bytes (-1, flags);
1499 if (flags & HEADER_CRC)
1501 unsigned int crc16 = updcrc (magic, 0) & 0xffff;
1502 unsigned int header16 = get_byte ();
1503 header16 |= ((unsigned int) get_byte ()) << 8;
1504 if (header16 != crc16)
1507 "%s: %s: header checksum 0x%04x != computed checksum 0x%04x\n",
1508 program_name, ifname, header16, crc16);
1516 header_bytes = inptr + 2*4; /* include crc and size */
1519 } else if (memcmp(magic, PKZIP_MAGIC, 2) == 0 && inptr == 2
1520 && memcmp((char*)inbuf, PKZIP_MAGIC, 4) == 0) {
1521 /* To simplify the code, we support a zip file when alone only.
1522 * We are thus guaranteed that the entire local header fits in inbuf.
1526 if (check_zipfile(in) != OK) return -1;
1527 /* check_zipfile may get ofname from the local header */
1530 } else if (memcmp(magic, PACK_MAGIC, 2) == 0) {
1534 } else if (memcmp(magic, LZW_MAGIC, 2) == 0) {
1536 method = COMPRESSED;
1539 } else if (memcmp(magic, LZH_MAGIC, 2) == 0) {
1544 } else if (force && to_stdout && !list) { /* pass input unchanged */
1550 if (imagic0 != EOF) {
1551 write_buf(fileno(stdout), magic, 1);
1555 if (method >= 0) return method;
1558 fprintf (stderr, "\n%s: %s: not in gzip format\n",
1559 program_name, ifname);
1566 for (inbyte = imagic1; inbyte == 0; inbyte = try_byte ())
1571 WARN ((stderr, "\n%s: %s: decompression OK, trailing zero bytes ignored\n",
1572 program_name, ifname));
1577 WARN((stderr, "\n%s: %s: decompression OK, trailing garbage ignored\n",
1578 program_name, ifname));
1583 /* ========================================================================
1584 * Display the characteristics of the compressed file.
1585 * If the given method is < 0, display the accumulated totals.
1586 * IN assertions: time_stamp, header_bytes and ifile_size are initialized.
1588 local void do_list(ifd, method)
1589 int ifd; /* input file descriptor */
1590 int method; /* compression method */
1592 ulg crc; /* original crc */
1593 static int first_time = 1;
1594 static char const *const methods[MAX_METHODS] = {
1599 "", "", "", "", /* 4 to 7 reserved */
1601 int positive_off_t_width = 1;
1604 for (o = OFF_T_MAX; 9 < o; o /= 10) {
1605 positive_off_t_width++;
1608 if (first_time && method >= 0) {
1611 printf("method crc date time ");
1614 printf("%*.*s %*.*s ratio uncompressed_name\n",
1615 positive_off_t_width, positive_off_t_width, "compressed",
1616 positive_off_t_width, positive_off_t_width, "uncompressed");
1618 } else if (method < 0) {
1619 if (total_in <= 0 || total_out <= 0) return;
1623 if (verbose || !quiet) {
1624 fprint_off(stdout, total_in, positive_off_t_width);
1626 fprint_off(stdout, total_out, positive_off_t_width);
1629 display_ratio(total_out-(total_in-header_bytes), total_out, stdout);
1630 /* header_bytes is not meaningful but used to ensure the same
1631 * ratio if there is a single file.
1633 printf(" (totals)\n");
1636 crc = (ulg)~0; /* unknown */
1638 bytes_in = ifile_size;
1640 if (!RECORD_IO && method == DEFLATED && !last_member) {
1641 /* Get the crc and uncompressed size for gzip'ed (not zip'ed) files.
1642 * If the lseek fails, we could use read() to get to the end, but
1643 * --list is used to get quick results.
1644 * Use "gunzip < foo.gz | wc -c" to get the uncompressed size if
1645 * you are not concerned about speed.
1647 bytes_in = lseek(ifd, (off_t)(-8), SEEK_END);
1648 if (bytes_in != -1L) {
1651 if (read(ifd, (char*)buf, sizeof(buf)) != sizeof(buf)) {
1655 bytes_out = LG(buf+4);
1661 struct tm *tm = localtime (&time_stamp.tv_sec);
1662 printf ("%5s %08lx ", methods[method], crc);
1664 printf ("%s%3d %02d:%02d ",
1665 ("Jan\0Feb\0Mar\0Apr\0May\0Jun\0Jul\0Aug\0Sep\0Oct\0Nov\0Dec"
1667 tm->tm_mday, tm->tm_hour, tm->tm_min);
1669 printf ("??? ?? ??:?? ");
1671 fprint_off(stdout, bytes_in, positive_off_t_width);
1673 fprint_off(stdout, bytes_out, positive_off_t_width);
1675 if (bytes_in == -1L) {
1677 bytes_in = bytes_out = header_bytes = 0;
1678 } else if (total_in >= 0) {
1679 total_in += bytes_in;
1681 if (bytes_out == -1L) {
1683 bytes_in = bytes_out = header_bytes = 0;
1684 } else if (total_out >= 0) {
1685 total_out += bytes_out;
1687 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out, stdout);
1688 printf(" %s\n", ofname);
1691 /* ========================================================================
1692 * Shorten the given name by one character, or replace a .tar extension
1693 * with .tgz. Truncate the last part of the name which is longer than
1694 * MIN_PART characters: 1234.678.012.gz -> 123.678.012.gz. If the name
1695 * has only parts shorter than MIN_PART truncate the longest part.
1696 * For decompression, just remove the last character of the name.
1698 * IN assertion: for compression, the suffix of the given name is z_suffix.
1700 local void shorten_name(name)
1703 int len; /* length of name without z_suffix */
1704 char *trunc = NULL; /* character to be truncated */
1705 int plen; /* current part length */
1706 int min_part = MIN_PART; /* current minimum part length */
1712 gzip_error ("name too short");
1716 p = get_suffix(name);
1718 gzip_error ("can't recover suffix\n");
1722 /* compress 1234567890.tar to 1234567890.tgz */
1723 if (len > 4 && strequ(p-4, ".tar")) {
1724 strcpy(p-4, ".tgz");
1727 /* Try keeping short extensions intact:
1728 * 1234.678.012.gz -> 123.678.012.gz
1731 p = strrchr(name, PATH_SEP);
1734 plen = strcspn(p, PART_SEP);
1736 if (plen > min_part) trunc = p-1;
1739 } while (trunc == NULL && --min_part != 0);
1741 if (trunc != NULL) {
1743 trunc[0] = trunc[1];
1747 trunc = strrchr(name, PART_SEP[0]);
1749 gzip_error ("internal error in shorten_name");
1750 if (trunc[1] == '\0') trunc--; /* force truncation */
1752 strcpy(trunc, z_suffix);
1755 /* ========================================================================
1756 * The compressed file already exists, so ask for confirmation.
1757 * Return ERROR if the file must be skipped.
1759 local int check_ofname()
1761 /* Ask permission to overwrite the existing file */
1764 fprintf (stderr, "%s: %s already exists;", program_name, ofname);
1765 if (foreground && (presume_input_tty || isatty(fileno(stdin)))) {
1766 fprintf(stderr, " do you wish to overwrite (y or n)? ");
1771 fprintf(stderr, "\tnot overwritten\n");
1772 if (exit_code == OK) exit_code = WARNING;
1776 if (xunlink (ofname)) {
1783 /* Change the owner and group of a file. FD is a file descriptor for
1784 the file and NAME its name. Change it to user UID and to group GID.
1785 If UID or GID is -1, though, do not change the corresponding user
1788 do_chown (int fd, char const *name, uid_t uid, gid_t gid)
1792 ignore_value (fchown (fd, uid, gid));
1794 ignore_value (chown (name, uid, gid));
1799 /* ========================================================================
1800 * Copy modes, times, ownership from input file to output file.
1801 * IN assertion: to_stdout is false.
1803 local void copy_stat(ifstat)
1804 struct stat *ifstat;
1806 mode_t mode = ifstat->st_mode & S_IRWXUGO;
1810 struct timespec timespec[2];
1811 timespec[0] = get_stat_atime (ifstat);
1812 timespec[1] = get_stat_mtime (ifstat);
1814 if (decompress && 0 <= time_stamp.tv_nsec
1815 && ! (timespec[1].tv_sec == time_stamp.tv_sec
1816 && timespec[1].tv_nsec == time_stamp.tv_nsec))
1818 timespec[1] = time_stamp;
1820 fprintf(stderr, "%s: time stamp restored\n", ofname);
1824 if (fdutimens (ofd, ofname, timespec) != 0)
1827 WARN ((stderr, "%s: ", program_name));
1836 /* Change the group first, then the permissions, then the owner.
1837 That way, the permissions will be correct on systems that allow
1838 users to give away files, without introducing a security hole.
1839 Security depends on permissions not containing the setuid or
1842 do_chown (ofd, ofname, -1, ifstat->st_gid);
1845 r = fchmod (ofd, mode);
1847 r = chmod (ofname, mode);
1851 WARN ((stderr, "%s: ", program_name));
1858 do_chown (ofd, ofname, ifstat->st_uid, -1);
1863 /* ========================================================================
1864 * Recurse through the given directory.
1866 local void treat_dir (fd, dir)
1871 char nbuf[MAX_PATH_LEN];
1876 dirp = fdopendir (fd);
1884 entries = streamsavedir (dirp, SAVEDIR_SORT_NONE);
1887 if (closedir (dirp) != 0)
1892 for (entry = entries; *entry; entry += entrylen + 1) {
1893 size_t len = strlen (dir);
1894 entrylen = strlen (entry);
1895 if (strequ (entry, ".") || strequ (entry, ".."))
1897 if (len + entrylen < MAX_PATH_LEN - 2) {
1899 if (len != 0 /* dir = "" means current dir on Amiga */
1901 && dir[len-1] != PATH_SEP2
1904 && dir[len-1] != PATH_SEP3
1907 nbuf[len++] = PATH_SEP;
1909 strcpy (nbuf + len, entry);
1912 fprintf(stderr,"%s: %s/%s: pathname too long\n",
1913 program_name, dir, entry);
1919 #endif /* ! NO_DIR */
1921 /* Make sure signals get handled properly. */
1924 install_signal_handlers ()
1926 int nsigs = sizeof handled_sig / sizeof handled_sig[0];
1930 struct sigaction act;
1932 sigemptyset (&caught_signals);
1933 for (i = 0; i < nsigs; i++)
1935 sigaction (handled_sig[i], NULL, &act);
1936 if (act.sa_handler != SIG_IGN)
1937 sigaddset (&caught_signals, handled_sig[i]);
1940 act.sa_handler = abort_gzip_signal;
1941 act.sa_mask = caught_signals;
1944 for (i = 0; i < nsigs; i++)
1945 if (sigismember (&caught_signals, handled_sig[i]))
1949 sigaction (handled_sig[i], &act, NULL);
1952 for (i = 0; i < nsigs; i++)
1953 if (signal (handled_sig[i], SIG_IGN) != SIG_IGN)
1957 signal (handled_sig[i], abort_gzip_signal);
1958 siginterrupt (handled_sig[i], 1);
1963 /* ========================================================================
1964 * Free all dynamically allocated variables and exit with the given code.
1966 local void do_exit(exitcode)
1969 static int in_exit = 0;
1971 if (in_exit) exit(exitcode);
1988 /* ========================================================================
1989 * Close and unlink the output file.
1992 remove_output_file ()
1997 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
1998 fd = remove_ofname_fd;
2001 remove_ofname_fd = -1;
2005 sigprocmask (SIG_SETMASK, &oldset, NULL);
2008 /* ========================================================================
2014 remove_output_file ();
2018 /* ========================================================================
2022 abort_gzip_signal (sig)
2026 signal (sig, SIG_IGN);
2027 remove_output_file ();
2028 if (sig == exiting_signal)
2030 signal (sig, SIG_DFL);