1 /* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
3 Copyright (C) 1999, 2001-2002, 2006-2007, 2009-2010 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) 2007, 2010 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>
72 #include "fcntl-safer.h"
74 #include "ignore-value.h"
75 #include "stat-time.h"
91 # ifndef _D_EXACT_NAMLEN
92 # define _D_EXACT_NAMLEN(dp) strlen ((dp)->d_name)
97 # define CLOSEDIR(d) (closedir(d), 0)
99 # define CLOSEDIR(d) closedir(d)
103 # include <utimens.h>
106 #define RW_USER (S_IRUSR | S_IWUSR) /* creation mode for open() */
109 # define MAX_PATH_LEN 1024 /* max pathname length */
121 off_t lseek OF((int fd, off_t offset, int whence));
125 #define OFF_T_MIN (~ (off_t) 0 << (sizeof (off_t) * CHAR_BIT - 1))
129 #define OFF_T_MAX (~ (off_t) 0 - OFF_T_MIN)
132 /* Use SA_NOCLDSTOP as a proxy for whether the sigaction machinery is
135 # define SA_NOCLDSTOP 0
136 # define sigprocmask(how, set, oset) /* empty */
137 # define sigset_t int
138 # if ! HAVE_SIGINTERRUPT
139 # define siginterrupt(sig, flag) /* empty */
143 #ifndef HAVE_WORKING_O_NOFOLLOW
144 # define HAVE_WORKING_O_NOFOLLOW 0
147 /* Separator for file name parts (see shorten_name()) */
148 #ifdef NO_MULTIPLE_DOTS
149 # define PART_SEP "-"
151 # define PART_SEP "."
156 DECLARE(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
157 DECLARE(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
158 DECLARE(ush, d_buf, DIST_BUFSIZE);
159 DECLARE(uch, window, 2L*WSIZE);
161 DECLARE(ush, tab_prefix, 1L<<BITS);
163 DECLARE(ush, tab_prefix0, 1L<<(BITS-1));
164 DECLARE(ush, tab_prefix1, 1L<<(BITS-1));
167 /* local variables */
169 /* If true, pretend that standard input is a tty. This option
170 is deliberately not documented, and only for testing. */
171 static bool presume_input_tty;
173 int ascii = 0; /* convert end-of-lines to local OS conventions */
174 int to_stdout = 0; /* output to stdout (-c) */
175 int decompress = 0; /* decompress (-d) */
176 int force = 0; /* don't ask questions, compress links (-f) */
177 int no_name = -1; /* don't save or restore the original file name */
178 int no_time = -1; /* don't save or restore the original file time */
179 int recursive = 0; /* recurse through directories (-r) */
180 int list = 0; /* list the file contents (-l) */
181 int verbose = 0; /* be verbose (-v) */
182 int quiet = 0; /* be very quiet (-q) */
183 int do_lzw = 0; /* generate output compatible with old compress (-Z) */
184 int test = 0; /* test .gz file integrity */
185 int foreground = 0; /* set if program run in foreground */
186 char *program_name; /* program name */
187 int maxbits = BITS; /* max bits per code for LZW */
188 int method = DEFLATED;/* compression method */
189 int level = 6; /* compression level */
190 int exit_code = OK; /* program exit code */
191 int save_orig_name; /* set if original name must be saved */
192 int last_member; /* set for .zip and .Z files */
193 int part_nb; /* number of parts in .gz file */
194 struct timespec time_stamp; /* original time stamp (modification time) */
195 off_t ifile_size; /* input file size, -1 for devices (debug only) */
196 char *env; /* contents of GZIP env variable */
197 char **args = NULL; /* argv pointer if GZIP env variable defined */
198 char const *z_suffix; /* default suffix (can be set with --suffix) */
199 size_t z_len; /* strlen(z_suffix) */
201 /* The set of signals that are caught. */
202 static sigset_t caught_signals;
204 /* If nonzero then exit with status WARNING, rather than with the usual
205 signal status, on receipt of a signal with this value. This
206 suppresses a "Broken Pipe" message with some shells. */
207 static int volatile exiting_signal;
209 /* If nonnegative, close this file descriptor and unlink ofname on error. */
210 static int volatile remove_ofname_fd = -1;
212 off_t bytes_in; /* number of input bytes */
213 off_t bytes_out; /* number of output bytes */
214 off_t total_in; /* input bytes for all files */
215 off_t total_out; /* output bytes for all files */
216 char ifname[MAX_PATH_LEN]; /* input file name */
217 char ofname[MAX_PATH_LEN]; /* output file name */
218 struct stat istat; /* status for input file */
219 int ifd; /* input file descriptor */
220 int ofd; /* output file descriptor */
221 unsigned insize; /* valid bytes in inbuf */
222 unsigned inptr; /* index of next byte to be processed in inbuf */
223 unsigned outcnt; /* bytes in output buffer */
225 static int handled_sig[] =
227 /* SIGINT must be first, as 'foreground' depends on it. */
245 /* For long options that have no equivalent short option, use a
246 non-character as a pseudo short option, starting with CHAR_MAX + 1. */
249 PRESUME_INPUT_TTY_OPTION = CHAR_MAX + 1
252 struct option longopts[] =
254 /* { name has_arg *flag val } */
255 {"ascii", 0, 0, 'a'}, /* ascii text mode */
256 {"to-stdout", 0, 0, 'c'}, /* write output on standard output */
257 {"stdout", 0, 0, 'c'}, /* write output on standard output */
258 {"decompress", 0, 0, 'd'}, /* decompress */
259 {"uncompress", 0, 0, 'd'}, /* decompress */
260 /* {"encrypt", 0, 0, 'e'}, encrypt */
261 {"force", 0, 0, 'f'}, /* force overwrite of output file */
262 {"help", 0, 0, 'h'}, /* give help */
263 /* {"pkzip", 0, 0, 'k'}, force output in pkzip format */
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 OF((void)) ATTRIBUTE_NORETURN;
288 local void help OF((void));
289 local void license OF((void));
290 local void version OF((void));
291 local int input_eof OF((void));
292 local void treat_stdin OF((void));
293 local void treat_file OF((char *iname));
294 local int create_outfile OF((void));
295 local char *get_suffix OF((char *name));
296 local int open_input_file OF((char *iname, struct stat *sbuf));
297 local void discard_input_bytes OF((size_t nbytes, unsigned int flags));
298 local int make_ofname OF((void));
299 local void shorten_name OF((char *name));
300 local int get_method OF((int in));
301 local void do_list OF((int ifd, int method));
302 local int check_ofname OF((void));
303 local void copy_stat OF((struct stat *ifstat));
304 local void install_signal_handlers OF((void));
305 local void remove_output_file OF((void));
306 local RETSIGTYPE abort_gzip_signal OF((int));
307 local void do_exit OF((int exitcode)) ATTRIBUTE_NORETURN;
308 int main OF((int argc, char **argv));
309 int (*work) OF((int infile, int outfile)) = zip; /* function to call */
312 local void treat_dir OF((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 " -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 */
406 int optc; /* current option */
408 EXPAND(argc, argv); /* wild card expansion if necessary */
410 program_name = gzip_base_name (argv[0]);
411 proglen = strlen (program_name);
413 atexit (close_stdin);
415 /* Suppress .exe for MSDOS, OS/2 and VMS: */
416 if (4 < proglen && strequ (program_name + proglen - 4, ".exe"))
417 program_name[proglen - 4] = '\0';
419 /* Add options in GZIP environment variable if there is one */
420 env = add_envopt(&argc, &argv, OPTIONS_VAR);
421 if (env != NULL) args = argv;
424 # define GNU_STANDARD 1
427 /* For compatibility with old compress, use program name as an option.
428 * Unless you compile with -DGNU_STANDARD=0, this program will behave as
429 * gzip even if it is invoked under the name gunzip or zcat.
431 * Systems which do not support links can still use -d or -dc.
432 * Ignore an .exe extension for MSDOS, OS/2 and VMS.
434 if (strncmp (program_name, "un", 2) == 0 /* ungzip, uncompress */
435 || strncmp (program_name, "gun", 3) == 0) /* gunzip */
437 else if (strequ (program_name + 1, "cat") /* zcat, pcat, gcat */
438 || strequ (program_name, "gzcat")) /* gzcat */
439 decompress = to_stdout = 1;
443 z_len = strlen(z_suffix);
445 while ((optc = getopt_long (argc, argv, "ab:cdfhH?lLmMnNqrS:tvVZ123456789",
446 longopts, (int *)0)) != -1) {
451 maxbits = atoi(optarg);
452 for (; *optarg; optarg++)
453 if (! ('0' <= *optarg && *optarg <= '9'))
455 fprintf (stderr, "%s: -b operand is not an integer\n",
461 to_stdout = 1; break;
463 decompress = 1; break;
467 help(); do_exit(OK); break;
469 list = decompress = to_stdout = 1; break;
471 license(); do_exit(OK); break;
472 case 'm': /* undocumented, may change later */
474 case 'M': /* undocumented, may change later */
477 no_name = no_time = 1; break;
479 no_name = no_time = 0; break;
480 case PRESUME_INPUT_TTY_OPTION:
481 presume_input_tty = true; break;
483 quiet = 1; verbose = 0; break;
486 fprintf (stderr, "%s: -r not supported on this system\n",
494 #ifdef NO_MULTIPLE_DOTS
495 if (*optarg == '.') optarg++;
497 z_len = strlen(optarg);
501 test = decompress = to_stdout = 1;
504 verbose++; quiet = 0; break;
506 version(); do_exit(OK); break;
511 fprintf(stderr, "%s: -Z not supported in this version\n",
516 case '1': case '2': case '3': case '4':
517 case '5': case '6': case '7': case '8': case '9':
521 /* Error message already emitted by getopt_long. */
524 } /* loop on all arguments */
526 /* By default, save name and timestamp on compression but do not
527 * restore them on decompression.
529 if (no_time < 0) no_time = decompress;
530 if (no_name < 0) no_name = decompress;
532 file_count = argc - optind;
536 if (ascii && !quiet) {
537 fprintf(stderr, "%s: option --ascii ignored on this system\n",
541 if (z_len == 0 || z_len > MAX_SUFFIX) {
542 fprintf(stderr, "%s: invalid suffix '%s'\n", program_name, z_suffix);
546 if (do_lzw && !decompress) work = lzw;
548 /* Allocate all global buffers (for DYN_ALLOC option) */
549 ALLOC(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
550 ALLOC(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
551 ALLOC(ush, d_buf, DIST_BUFSIZE);
552 ALLOC(uch, window, 2L*WSIZE);
554 ALLOC(ush, tab_prefix, 1L<<BITS);
556 ALLOC(ush, tab_prefix0, 1L<<(BITS-1));
557 ALLOC(ush, tab_prefix1, 1L<<(BITS-1));
560 exiting_signal = quiet ? SIGPIPE : 0;
561 install_signal_handlers ();
563 /* And get to work */
564 if (file_count != 0) {
565 if (to_stdout && !test && !list && (!decompress || !ascii)) {
566 SET_BINARY_MODE(fileno(stdout));
568 while (optind < argc) {
569 treat_file(argv[optind++]);
571 } else { /* Standard input */
574 if (list && !quiet && file_count > 1) {
575 do_list(-1, -1); /* print totals */
578 return exit_code; /* just to avoid lint warning */
581 /* Return nonzero when at end of file on input. */
585 if (!decompress || last_member)
590 if (insize != INBUFSIZ || fill_inbuf (1) == EOF)
593 /* Unget the char that fill_inbuf got. */
600 /* ========================================================================
601 * Compress or decompress stdin
603 local void treat_stdin()
606 && (presume_input_tty
607 || isatty(fileno((FILE *)(decompress ? stdin : stdout))))) {
608 /* Do not send compressed data to the terminal or read it from
609 * the terminal. We get here when user invoked the program
610 * without parameters, so be helpful. According to the GNU standards:
612 * If there is one behavior you think is most useful when the output
613 * is to a terminal, and another that you think is most useful when
614 * the output is a file or a pipe, then it is usually best to make
615 * the default behavior the one that is useful with output to a
616 * terminal, and have an option for the other behavior.
618 * Here we use the --force option to get the other behavior.
621 "%s: compressed data not %s a terminal. Use -f to force %scompression.\n",
622 program_name, decompress ? "read from" : "written to",
623 decompress ? "de" : "");
624 fprintf (stderr, "For help, type: %s -h\n", program_name);
628 if (decompress || !ascii) {
629 SET_BINARY_MODE(fileno(stdin));
631 if (!test && !list && (!decompress || !ascii)) {
632 SET_BINARY_MODE(fileno(stdout));
634 strcpy(ifname, "stdin");
635 strcpy(ofname, "stdout");
637 /* Get the file's time stamp and size. */
638 if (fstat (fileno (stdin), &istat) != 0)
640 progerror ("standard input");
643 ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1;
644 time_stamp.tv_nsec = -1;
645 if (!no_time || list)
647 if (S_ISREG (istat.st_mode))
648 time_stamp = get_stat_mtime (&istat);
650 gettime (&time_stamp);
653 clear_bufs(); /* clear input and output buffers */
659 method = get_method(ifd);
661 do_exit(exit_code); /* error message already emitted */
665 do_list(ifd, method);
669 /* Actually do the compression/decompression. Loop over zipped members.
672 if ((*work)(fileno(stdin), fileno(stdout)) != OK) return;
677 method = get_method(ifd);
678 if (method < 0) return; /* error message already emitted */
679 bytes_out = 0; /* required for length check */
684 fprintf(stderr, " OK\n");
686 } else if (!decompress) {
687 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
688 fprintf(stderr, "\n");
689 #ifdef DISPLAY_STDIN_RATIO
691 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
692 fprintf(stderr, "\n");
698 /* ========================================================================
699 * Compress or decompress the given file
701 local void treat_file(iname)
704 /* Accept "-" as synonym for stdin */
705 if (strequ(iname, "-")) {
706 int cflag = to_stdout;
712 /* Check if the input file is present, set ifname and istat: */
713 ifd = open_input_file (iname, &istat);
717 /* If the input name is that of a directory, recurse or ignore: */
718 if (S_ISDIR(istat.st_mode)) {
721 treat_dir (ifd, iname);
722 /* Warning: ifname is now garbage */
727 WARN ((stderr, "%s: %s is a directory -- ignored\n",
728 program_name, ifname));
734 if (! S_ISREG (istat.st_mode))
737 "%s: %s is not a directory or a regular file - ignored\n",
738 program_name, ifname));
742 if (istat.st_mode & S_ISUID)
744 WARN ((stderr, "%s: %s is set-user-ID on execution - ignored\n",
745 program_name, ifname));
749 if (istat.st_mode & S_ISGID)
751 WARN ((stderr, "%s: %s is set-group-ID on execution - ignored\n",
752 program_name, ifname));
759 if (istat.st_mode & S_ISVTX)
762 "%s: %s has the sticky bit set - file ignored\n",
763 program_name, ifname));
767 if (2 <= istat.st_nlink)
769 WARN ((stderr, "%s: %s has %lu other link%c -- unchanged\n",
770 program_name, ifname,
771 (unsigned long int) istat.st_nlink - 1,
772 istat.st_nlink == 2 ? ' ' : 's'));
779 ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1;
780 time_stamp.tv_nsec = -1;
781 if (!no_time || list)
782 time_stamp = get_stat_mtime (&istat);
784 /* Generate output file name. For -r and (-t or -l), skip files
785 * without a valid gzip suffix (check done in make_ofname).
787 if (to_stdout && !list && !test) {
788 strcpy(ofname, "stdout");
790 } else if (make_ofname() != OK) {
795 clear_bufs(); /* clear input and output buffers */
799 method = get_method(ifd); /* updates ofname if original given */
802 return; /* error message already emitted */
806 do_list(ifd, method);
807 if (close (ifd) != 0)
812 /* If compressing to a file, check if ofname is not ambiguous
813 * because the operating system truncates names. Otherwise, generate
814 * a new ofname and save the original name in the compressed file.
817 ofd = fileno(stdout);
818 /* Keep remove_ofname_fd negative. */
820 if (create_outfile() != OK) return;
822 if (!decompress && save_orig_name && !verbose && !quiet) {
823 fprintf(stderr, "%s: %s compressed to %s\n",
824 program_name, ifname, ofname);
827 /* Keep the name even if not truncated except with --no-name: */
828 if (!save_orig_name) save_orig_name = !no_name;
831 fprintf(stderr, "%s:\t", ifname);
834 /* Actually do the compression/decompression. Loop over zipped members.
837 if ((*work)(ifd, ofd) != OK) {
838 method = -1; /* force cleanup */
845 method = get_method(ifd);
846 if (method < 0) break; /* error message already emitted */
847 bytes_out = 0; /* required for length check */
850 if (close (ifd) != 0)
859 if (close (ofd) != 0)
862 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
863 remove_ofname_fd = -1;
864 unlink_errno = xunlink (ifname) == 0 ? 0 : errno;
865 sigprocmask (SIG_SETMASK, &oldset, NULL);
869 WARN ((stderr, "%s: ", program_name));
872 errno = unlink_errno;
880 remove_output_file ();
884 /* Display statistics */
887 fprintf(stderr, " OK");
888 } else if (decompress) {
889 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
891 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
893 if (!test && !to_stdout) {
894 fprintf(stderr, " -- replaced with %s", ofname);
896 fprintf(stderr, "\n");
900 /* ========================================================================
901 * Create the output file. Return OK or ERROR.
902 * Try several times if necessary to avoid truncating the z_suffix. For
903 * example, do not create a compressed file of name "1234567890123."
904 * Sets save_orig_name to true if the file name has been truncated.
905 * IN assertions: the input file has already been open (ifd is set) and
906 * ofname has already been updated if there was an original name.
907 * OUT assertions: ifd and ofd are closed in case of error.
909 local int create_outfile()
911 int name_shortened = 0;
912 int flags = (O_WRONLY | O_CREAT | O_EXCL
913 | (ascii && decompress ? 0 : O_BINARY));
920 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
921 remove_ofname_fd = ofd = OPEN (ofname, flags, RW_USER);
923 sigprocmask (SIG_SETMASK, &oldset, NULL);
932 shorten_name (ofname);
938 if (check_ofname () != OK)
952 if (name_shortened && decompress)
954 /* name might be too long if an original name was saved */
955 WARN ((stderr, "%s: %s: warning, name truncated\n",
956 program_name, ofname));
962 /* ========================================================================
963 * Return a pointer to the 'z' suffix of a file name, or NULL. For all
964 * systems, ".gz", ".z", ".Z", ".taz", ".tgz", "-gz", "-z" and "_z" are
965 * accepted suffixes, in addition to the value of the --suffix option.
966 * ".tgz" is a useful convention for tar.z files on systems limited
967 * to 3 characters extensions. On such systems, ".?z" and ".??z" are
968 * also accepted suffixes. For Unix, we do not want to accept any
969 * .??z suffix as indicating a compressed file; some people use .xyz
970 * to denote volume data.
971 * On systems allowing multiple versions of the same file (such as VMS),
972 * this function removes any version suffix in the given name.
974 local char *get_suffix(name)
978 char suffix[MAX_SUFFIX+3]; /* last chars of name, forced to lower case */
979 static char const *known_suffixes[] =
980 {NULL, ".gz", ".z", ".taz", ".tgz", "-gz", "-z", "_z",
985 char const **suf = known_suffixes;
988 if (strequ(z_suffix, "z")) suf++; /* check long suffixes first */
991 /* strip a version number from the file name */
993 char *v = strrchr(name, SUFFIX_SEP);
994 if (v != NULL) *v = '\0';
998 if (nlen <= MAX_SUFFIX+2) {
999 strcpy(suffix, name);
1001 strcpy(suffix, name+nlen-MAX_SUFFIX-2);
1004 slen = strlen(suffix);
1006 int s = strlen(*suf);
1007 if (slen > s && suffix[slen-s-1] != PATH_SEP
1008 && strequ(suffix + slen - s, *suf)) {
1011 } while (*++suf != NULL);
1017 /* Open file NAME with the given flags and mode and store its status
1018 into *ST. Return a file descriptor to the newly opened file, or -1
1019 (setting errno) on failure. */
1021 open_and_stat (char *name, int flags, mode_t mode, struct stat *st)
1025 /* Refuse to follow symbolic links unless -c or -f. */
1026 if (!to_stdout && !force)
1028 if (HAVE_WORKING_O_NOFOLLOW)
1029 flags |= O_NOFOLLOW;
1032 #if HAVE_LSTAT || defined lstat
1033 if (lstat (name, st) != 0)
1035 else if (S_ISLNK (st->st_mode))
1044 fd = OPEN (name, flags, mode);
1045 if (0 <= fd && fstat (fd, st) != 0)
1056 /* ========================================================================
1057 * Set ifname to the input file name (with a suffix appended if necessary)
1058 * and istat to its stats. For decompression, if no file exists with the
1059 * original name, try adding successively z_suffix, .gz, .z, -z and .Z.
1060 * For MSDOS, we try only z_suffix and z.
1061 * Return an open file descriptor or -1.
1064 open_input_file (iname, sbuf)
1068 int ilen; /* strlen(ifname) */
1069 int z_suffix_errno = 0;
1070 static char const *suffixes[] = {NULL, ".gz", ".z", "-z", ".Z", NULL};
1071 char const **suf = suffixes;
1073 #ifdef NO_MULTIPLE_DOTS
1074 char *dot; /* pointer to ifname extension, or NULL */
1077 int open_flags = (O_RDONLY | O_NONBLOCK | O_NOCTTY
1078 | (ascii && !decompress ? 0 : O_BINARY));
1082 if (sizeof ifname - 1 <= strlen (iname))
1085 strcpy(ifname, iname);
1087 /* If input file exists, return OK. */
1088 fd = open_and_stat (ifname, open_flags, RW_USER, sbuf);
1092 if (!decompress || errno != ENOENT) {
1096 /* file.ext doesn't exist, try adding a suffix (after removing any
1097 * version number for VMS).
1099 s = get_suffix(ifname);
1101 progerror(ifname); /* ifname already has z suffix and does not exist */
1104 #ifdef NO_MULTIPLE_DOTS
1105 dot = strrchr(ifname, '.');
1107 strcat(ifname, ".");
1108 dot = strrchr(ifname, '.');
1111 ilen = strlen(ifname);
1112 if (strequ(z_suffix, ".gz")) suf++;
1114 /* Search for all suffixes */
1116 char const *s0 = s = *suf;
1117 strcpy (ifname, iname);
1118 #ifdef NO_MULTIPLE_DOTS
1120 if (*dot == '\0') strcpy (dot, ".");
1122 #ifdef MAX_EXT_CHARS
1123 if (MAX_EXT_CHARS < strlen (s) + strlen (dot + 1))
1124 dot[MAX_EXT_CHARS + 1 - strlen (s)] = '\0';
1126 if (sizeof ifname <= ilen + strlen (s))
1129 fd = open_and_stat (ifname, open_flags, RW_USER, sbuf);
1132 if (errno != ENOENT)
1137 if (strequ (s0, z_suffix))
1138 z_suffix_errno = errno;
1139 } while (*++suf != NULL);
1141 /* No suffix found, complain using z_suffix: */
1142 strcpy(ifname, iname);
1143 #ifdef NO_MULTIPLE_DOTS
1144 if (*dot == '\0') strcpy(dot, ".");
1146 #ifdef MAX_EXT_CHARS
1147 if (MAX_EXT_CHARS < z_len + strlen (dot + 1))
1148 dot[MAX_EXT_CHARS + 1 - z_len] = '\0';
1150 strcat(ifname, z_suffix);
1151 errno = z_suffix_errno;
1156 fprintf (stderr, "%s: %s: file name too long\n", program_name, iname);
1161 /* ========================================================================
1162 * Generate ofname given ifname. Return OK, or WARNING if file must be skipped.
1163 * Sets save_orig_name to true if the file name has been truncated.
1165 local int make_ofname()
1167 char *suff; /* ofname z suffix */
1169 strcpy(ofname, ifname);
1170 /* strip a version number if any and get the gzip suffix if present: */
1171 suff = get_suffix(ofname);
1175 /* With -t or -l, try all files (even without .gz suffix)
1176 * except with -r (behave as with just -dr).
1178 if (!recursive && (list || test)) return OK;
1180 /* Avoid annoying messages with -r */
1181 if (verbose || (!recursive && !quiet)) {
1182 WARN((stderr,"%s: %s: unknown suffix -- ignored\n",
1183 program_name, ifname));
1187 /* Make a special case for .tgz and .taz: */
1189 if (strequ(suff, ".tgz") || strequ(suff, ".taz")) {
1190 strcpy(suff, ".tar");
1192 *suff = '\0'; /* strip the z suffix */
1194 /* ofname might be changed later if infile contains an original name */
1196 } else if (suff && ! force) {
1197 /* Avoid annoying messages with -r (see treat_dir()) */
1198 if (verbose || (!recursive && !quiet)) {
1199 /* Don't use WARN, as it affects exit status. */
1200 fprintf (stderr, "%s: %s already has %s suffix -- unchanged\n",
1201 program_name, ifname, suff);
1207 #ifdef NO_MULTIPLE_DOTS
1208 suff = strrchr(ofname, '.');
1210 if (sizeof ofname <= strlen (ofname) + 1)
1212 strcat(ofname, ".");
1213 # ifdef MAX_EXT_CHARS
1214 if (strequ(z_suffix, "z")) {
1215 if (sizeof ofname <= strlen (ofname) + 2)
1217 strcat(ofname, "gz"); /* enough room */
1220 /* On the Atari and some versions of MSDOS,
1221 * ENAMETOOLONG does not work correctly. So we
1222 * must truncate here.
1224 } else if (strlen(suff)-1 + z_len > MAX_SUFFIX) {
1225 suff[MAX_SUFFIX+1-z_len] = '\0';
1229 #endif /* NO_MULTIPLE_DOTS */
1230 if (sizeof ofname <= strlen (ofname) + z_len)
1232 strcat(ofname, z_suffix);
1234 } /* decompress ? */
1238 WARN ((stderr, "%s: %s: file name too long\n", program_name, ifname));
1242 /* Discard NBYTES input bytes from the input, or up through the next
1243 zero byte if NBYTES == (size_t) -1. If FLAGS say that the header
1244 CRC should be computed, update the CRC accordingly. */
1246 discard_input_bytes (nbytes, flags)
1252 uch c = get_byte ();
1253 if (flags & HEADER_CRC)
1255 if (nbytes != (size_t) -1)
1262 /* ========================================================================
1263 * Check the magic number of the input file and update ofname if an
1264 * original name was given and to_stdout is not set.
1265 * Return the compression method, -1 for error, -2 for warning.
1266 * Set inptr to the offset of the next byte to be processed.
1267 * Updates time_stamp if there is one and --no-time is not used.
1268 * This function may be called repeatedly for an input file consisting
1269 * of several contiguous gzip'ed members.
1270 * IN assertions: there is at least one remaining compressed member.
1271 * If the member is a zip file, it must be the only one.
1273 local int get_method(in)
1274 int in; /* input file descriptor */
1276 uch flags; /* compression flags */
1277 uch magic[10]; /* magic header */
1278 int imagic0; /* first magic byte or EOF */
1279 int imagic1; /* like magic[1], but can represent EOF */
1280 ulg stamp; /* time stamp */
1282 /* If --force and --stdout, zcat == cat, so do not complain about
1283 * premature end of file: use try_byte instead of get_byte.
1285 if (force && to_stdout) {
1286 imagic0 = try_byte();
1288 imagic1 = try_byte ();
1290 /* If try_byte returned EOF, magic[1] == (char) EOF. */
1292 magic[0] = get_byte ();
1295 magic[1] = get_byte ();
1296 imagic1 = 0; /* avoid lint warning */
1298 imagic1 = try_byte ();
1302 method = -1; /* unknown yet */
1303 part_nb++; /* number of parts in gzip file */
1305 last_member = RECORD_IO;
1306 /* assume multiple members in gzip file except for record oriented I/O */
1308 if (memcmp(magic, GZIP_MAGIC, 2) == 0
1309 || memcmp(magic, OLD_GZIP_MAGIC, 2) == 0) {
1311 method = (int)get_byte();
1312 if (method != DEFLATED) {
1314 "%s: %s: unknown method %d -- not supported\n",
1315 program_name, ifname, method);
1320 flags = (uch)get_byte();
1322 if ((flags & ENCRYPTED) != 0) {
1324 "%s: %s is encrypted -- not supported\n",
1325 program_name, ifname);
1329 if ((flags & RESERVED) != 0) {
1331 "%s: %s has flags 0x%x -- not supported\n",
1332 program_name, ifname, flags);
1334 if (force <= 1) return -1;
1336 stamp = (ulg)get_byte();
1337 stamp |= ((ulg)get_byte()) << 8;
1338 stamp |= ((ulg)get_byte()) << 16;
1339 stamp |= ((ulg)get_byte()) << 24;
1340 if (stamp != 0 && !no_time)
1342 time_stamp.tv_sec = stamp;
1343 time_stamp.tv_nsec = 0;
1346 magic[8] = get_byte (); /* Ignore extra flags. */
1347 magic[9] = get_byte (); /* Ignore OS type. */
1349 if (flags & HEADER_CRC)
1351 magic[2] = DEFLATED;
1353 magic[4] = stamp & 0xff;
1354 magic[5] = (stamp >> 8) & 0xff;
1355 magic[6] = (stamp >> 16) & 0xff;
1356 magic[7] = stamp >> 24;
1361 if ((flags & EXTRA_FIELD) != 0) {
1363 unsigned int len = lenbuf[0] = get_byte ();
1364 len |= (lenbuf[1] = get_byte ()) << 8;
1366 fprintf(stderr,"%s: %s: extra field of %u bytes ignored\n",
1367 program_name, ifname, len);
1369 if (flags & HEADER_CRC)
1371 discard_input_bytes (len, flags);
1374 /* Get original file name if it was truncated */
1375 if ((flags & ORIG_NAME) != 0) {
1376 if (no_name || (to_stdout && !list) || part_nb > 1) {
1377 /* Discard the old name */
1378 discard_input_bytes (-1, flags);
1380 /* Copy the base name. Keep a directory prefix intact. */
1381 char *p = gzip_base_name (ofname);
1384 *p = (char) get_byte ();
1385 if (*p++ == '\0') break;
1386 if (p >= ofname+sizeof(ofname)) {
1387 gzip_error ("corrupted input -- file name too large");
1390 if (flags & HEADER_CRC)
1391 updcrc ((uch *) base, p - base);
1392 p = gzip_base_name (base);
1393 memmove (base, p, strlen (p) + 1);
1394 /* If necessary, adapt the name to local OS conventions: */
1396 MAKE_LEGAL_NAME(base);
1397 if (base) list=0; /* avoid warning about unused variable */
1399 } /* no_name || to_stdout */
1402 /* Discard file comment if any */
1403 if ((flags & COMMENT) != 0) {
1404 discard_input_bytes (-1, flags);
1407 if (flags & HEADER_CRC)
1409 unsigned int crc16 = updcrc (magic, 0) & 0xffff;
1410 unsigned int header16 = get_byte ();
1411 header16 |= ((unsigned int) get_byte ()) << 8;
1412 if (header16 != crc16)
1415 "%s: %s: header checksum 0x%04x != computed checksum 0x%04x\n",
1416 program_name, ifname, header16, crc16);
1424 header_bytes = inptr + 2*4; /* include crc and size */
1427 } else if (memcmp(magic, PKZIP_MAGIC, 2) == 0 && inptr == 2
1428 && memcmp((char*)inbuf, PKZIP_MAGIC, 4) == 0) {
1429 /* To simplify the code, we support a zip file when alone only.
1430 * We are thus guaranteed that the entire local header fits in inbuf.
1434 if (check_zipfile(in) != OK) return -1;
1435 /* check_zipfile may get ofname from the local header */
1438 } else if (memcmp(magic, PACK_MAGIC, 2) == 0) {
1442 } else if (memcmp(magic, LZW_MAGIC, 2) == 0) {
1444 method = COMPRESSED;
1447 } else if (memcmp(magic, LZH_MAGIC, 2) == 0) {
1452 } else if (force && to_stdout && !list) { /* pass input unchanged */
1458 if (imagic0 != EOF) {
1459 write_buf(fileno(stdout), magic, 1);
1463 if (method >= 0) return method;
1466 fprintf (stderr, "\n%s: %s: not in gzip format\n",
1467 program_name, ifname);
1474 for (inbyte = imagic1; inbyte == 0; inbyte = try_byte ())
1479 WARN ((stderr, "\n%s: %s: decompression OK, trailing zero bytes ignored\n",
1480 program_name, ifname));
1485 WARN((stderr, "\n%s: %s: decompression OK, trailing garbage ignored\n",
1486 program_name, ifname));
1491 /* ========================================================================
1492 * Display the characteristics of the compressed file.
1493 * If the given method is < 0, display the accumulated totals.
1494 * IN assertions: time_stamp, header_bytes and ifile_size are initialized.
1496 local void do_list(ifd, method)
1497 int ifd; /* input file descriptor */
1498 int method; /* compression method */
1500 ulg crc; /* original crc */
1501 static int first_time = 1;
1502 static char const *const methods[MAX_METHODS] = {
1507 "", "", "", "", /* 4 to 7 reserved */
1509 int positive_off_t_width = 1;
1512 for (o = OFF_T_MAX; 9 < o; o /= 10) {
1513 positive_off_t_width++;
1516 if (first_time && method >= 0) {
1519 printf("method crc date time ");
1522 printf("%*.*s %*.*s ratio uncompressed_name\n",
1523 positive_off_t_width, positive_off_t_width, "compressed",
1524 positive_off_t_width, positive_off_t_width, "uncompressed");
1526 } else if (method < 0) {
1527 if (total_in <= 0 || total_out <= 0) return;
1531 if (verbose || !quiet) {
1532 fprint_off(stdout, total_in, positive_off_t_width);
1534 fprint_off(stdout, total_out, positive_off_t_width);
1537 display_ratio(total_out-(total_in-header_bytes), total_out, stdout);
1538 /* header_bytes is not meaningful but used to ensure the same
1539 * ratio if there is a single file.
1541 printf(" (totals)\n");
1544 crc = (ulg)~0; /* unknown */
1546 bytes_in = ifile_size;
1548 if (!RECORD_IO && method == DEFLATED && !last_member) {
1549 /* Get the crc and uncompressed size for gzip'ed (not zip'ed) files.
1550 * If the lseek fails, we could use read() to get to the end, but
1551 * --list is used to get quick results.
1552 * Use "gunzip < foo.gz | wc -c" to get the uncompressed size if
1553 * you are not concerned about speed.
1555 bytes_in = lseek(ifd, (off_t)(-8), SEEK_END);
1556 if (bytes_in != -1L) {
1559 if (read(ifd, (char*)buf, sizeof(buf)) != sizeof(buf)) {
1563 bytes_out = LG(buf+4);
1569 struct tm *tm = localtime (&time_stamp.tv_sec);
1570 printf ("%5s %08lx ", methods[method], crc);
1572 printf ("%s%3d %02d:%02d ",
1573 ("Jan\0Feb\0Mar\0Apr\0May\0Jun\0Jul\0Aug\0Sep\0Oct\0Nov\0Dec"
1575 tm->tm_mday, tm->tm_hour, tm->tm_min);
1577 printf ("??? ?? ??:?? ");
1579 fprint_off(stdout, bytes_in, positive_off_t_width);
1581 fprint_off(stdout, bytes_out, positive_off_t_width);
1583 if (bytes_in == -1L) {
1585 bytes_in = bytes_out = header_bytes = 0;
1586 } else if (total_in >= 0) {
1587 total_in += bytes_in;
1589 if (bytes_out == -1L) {
1591 bytes_in = bytes_out = header_bytes = 0;
1592 } else if (total_out >= 0) {
1593 total_out += bytes_out;
1595 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out, stdout);
1596 printf(" %s\n", ofname);
1599 /* ========================================================================
1600 * Shorten the given name by one character, or replace a .tar extension
1601 * with .tgz. Truncate the last part of the name which is longer than
1602 * MIN_PART characters: 1234.678.012.gz -> 123.678.012.gz. If the name
1603 * has only parts shorter than MIN_PART truncate the longest part.
1604 * For decompression, just remove the last character of the name.
1606 * IN assertion: for compression, the suffix of the given name is z_suffix.
1608 local void shorten_name(name)
1611 int len; /* length of name without z_suffix */
1612 char *trunc = NULL; /* character to be truncated */
1613 int plen; /* current part length */
1614 int min_part = MIN_PART; /* current minimum part length */
1620 gzip_error ("name too short");
1624 p = get_suffix(name);
1626 gzip_error ("can't recover suffix\n");
1630 /* compress 1234567890.tar to 1234567890.tgz */
1631 if (len > 4 && strequ(p-4, ".tar")) {
1632 strcpy(p-4, ".tgz");
1635 /* Try keeping short extensions intact:
1636 * 1234.678.012.gz -> 123.678.012.gz
1639 p = strrchr(name, PATH_SEP);
1642 plen = strcspn(p, PART_SEP);
1644 if (plen > min_part) trunc = p-1;
1647 } while (trunc == NULL && --min_part != 0);
1649 if (trunc != NULL) {
1651 trunc[0] = trunc[1];
1655 trunc = strrchr(name, PART_SEP[0]);
1657 gzip_error ("internal error in shorten_name");
1658 if (trunc[1] == '\0') trunc--; /* force truncation */
1660 strcpy(trunc, z_suffix);
1663 /* ========================================================================
1664 * The compressed file already exists, so ask for confirmation.
1665 * Return ERROR if the file must be skipped.
1667 local int check_ofname()
1669 /* Ask permission to overwrite the existing file */
1672 fprintf (stderr, "%s: %s already exists;", program_name, ofname);
1673 if (foreground && (presume_input_tty || isatty(fileno(stdin)))) {
1674 fprintf(stderr, " do you wish to overwrite (y or n)? ");
1679 fprintf(stderr, "\tnot overwritten\n");
1680 if (exit_code == OK) exit_code = WARNING;
1684 if (xunlink (ofname)) {
1692 /* ========================================================================
1693 * Copy modes, times, ownership from input file to output file.
1694 * IN assertion: to_stdout is false.
1696 local void copy_stat(ifstat)
1697 struct stat *ifstat;
1699 mode_t mode = ifstat->st_mode & S_IRWXUGO;
1703 struct timespec timespec[2];
1704 timespec[0] = get_stat_atime (ifstat);
1705 timespec[1] = get_stat_mtime (ifstat);
1707 if (decompress && 0 <= time_stamp.tv_nsec
1708 && ! (timespec[1].tv_sec == time_stamp.tv_sec
1709 && timespec[1].tv_nsec == time_stamp.tv_nsec))
1711 timespec[1] = time_stamp;
1713 fprintf(stderr, "%s: time stamp restored\n", ofname);
1717 if (fdutimens (ofd, ofname, timespec) != 0)
1720 WARN ((stderr, "%s: ", program_name));
1730 /* Copy ownership */
1732 ignore_value (fchown (ofd, ifstat->st_uid, ifstat->st_gid));
1734 ignore_value (chown (ofname, ifstat->st_uid, ifstat->st_gid));
1738 /* Copy the protection modes */
1740 r = fchmod (ofd, mode);
1742 r = chmod (ofname, mode);
1746 WARN ((stderr, "%s: ", program_name));
1756 /* ========================================================================
1757 * Recurse through the given directory. This code is taken from ncompress.
1759 local void treat_dir (fd, dir)
1765 char nbuf[MAX_PATH_LEN];
1768 dirp = fdopendir (fd);
1776 ** WARNING: the following algorithm could occasionally cause
1777 ** compress to produce error warnings of the form "<filename>.gz
1778 ** already has .gz suffix - ignored". This occurs when the
1779 ** .gz output file is inserted into the directory below
1780 ** readdir's current pointer.
1781 ** These warnings are harmless but annoying, so they are suppressed
1782 ** with option -r (except when -v is on). An alternative
1783 ** to allowing this would be to store the entire directory
1784 ** list in memory, then compress the entries in the stored
1785 ** list. Given the depth-first recursive algorithm used here,
1786 ** this could use up a tremendous amount of memory. I don't
1787 ** think it's worth it. -- Dave Mack
1788 ** (An other alternative might be two passes to avoid depth-first.)
1791 while ((errno = 0, dp = readdir(dirp)) != NULL) {
1793 if (strequ(dp->d_name,".") || strequ(dp->d_name,"..")) {
1797 if (len + _D_EXACT_NAMLEN (dp) + 1 < MAX_PATH_LEN - 1) {
1799 if (len != 0 /* dir = "" means current dir on Amiga */
1801 && dir[len-1] != PATH_SEP2
1804 && dir[len-1] != PATH_SEP3
1807 nbuf[len++] = PATH_SEP;
1809 strcpy(nbuf+len, dp->d_name);
1812 fprintf(stderr,"%s: %s/%s: pathname too long\n",
1813 program_name, dir, dp->d_name);
1819 if (CLOSEDIR(dirp) != 0)
1822 #endif /* ! NO_DIR */
1824 /* Make sure signals get handled properly. */
1827 install_signal_handlers ()
1829 int nsigs = sizeof handled_sig / sizeof handled_sig[0];
1833 struct sigaction act;
1835 sigemptyset (&caught_signals);
1836 for (i = 0; i < nsigs; i++)
1838 sigaction (handled_sig[i], NULL, &act);
1839 if (act.sa_handler != SIG_IGN)
1840 sigaddset (&caught_signals, handled_sig[i]);
1843 act.sa_handler = abort_gzip_signal;
1844 act.sa_mask = caught_signals;
1847 for (i = 0; i < nsigs; i++)
1848 if (sigismember (&caught_signals, handled_sig[i]))
1852 sigaction (handled_sig[i], &act, NULL);
1855 for (i = 0; i < nsigs; i++)
1856 if (signal (handled_sig[i], SIG_IGN) != SIG_IGN)
1860 signal (handled_sig[i], abort_gzip_signal);
1861 siginterrupt (handled_sig[i], 1);
1866 /* ========================================================================
1867 * Free all dynamically allocated variables and exit with the given code.
1869 local void do_exit(exitcode)
1872 static int in_exit = 0;
1874 if (in_exit) exit(exitcode);
1893 /* ========================================================================
1894 * Close and unlink the output file.
1897 remove_output_file ()
1902 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
1903 fd = remove_ofname_fd;
1906 remove_ofname_fd = -1;
1910 sigprocmask (SIG_SETMASK, &oldset, NULL);
1913 /* ========================================================================
1919 remove_output_file ();
1923 /* ========================================================================
1927 abort_gzip_signal (sig)
1931 signal (sig, SIG_IGN);
1932 remove_output_file ();
1933 if (sig == exiting_signal)
1935 signal (sig, SIG_DFL);