1 /* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
3 Copyright (C) 1999, 2001, 2002, 2006 Free Software Foundation, Inc.
4 Copyright (C) 1992-1993 Jean-loup Gailly
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
21 * The unzip code was written and put in the public domain by Mark Adler.
22 * Portions of the lzw code are derived from the public domain 'compress'
23 * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
24 * Ken Turkowski, Dave Mack and Peter Jannesen.
26 * See the license_msg below and the file COPYING for the software license.
27 * See the file algorithm.doc for the compression algorithms and file formats.
30 static char *license_msg[] = {
31 "Copyright (C) 2006 Free Software Foundation, Inc.",
32 "Copyright (C) 1993 Jean-loup Gailly.",
33 "This is free software. You may redistribute copies of it under the terms of",
34 "the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.",
35 "There is NO WARRANTY, to the extent permitted by law.",
38 /* Compress files with zip algorithm and 'compress' interface.
39 * See help() function below for all options.
41 * file.gz: compressed file with same mode, owner, and utimes
42 * or stdout with -c option or if stdin used as input.
43 * If the output file name had to be truncated, the original name is kept
44 * in the compressed file.
45 * On MSDOS, file.tmp -> file.tmz. On VMS, file.tmp -> file.tmp-gz.
47 * Using gz on MSDOS would create too many file name conflicts. For
48 * example, foo.txt -> foo.tgz (.tgz must be reserved as shorthand for
49 * tar.gz). Similarly, foo.dir and foo.doc would both be mapped to foo.dgz.
50 * I also considered 12345678.txt -> 12345txt.gz but this truncates the name
51 * too heavily. There is no ideal solution given the MSDOS 8+3 limitation.
53 * For the meaning of all compilation flags, see comments in Makefile.in.
57 static char rcsid[] = "$Id$";
62 #include <sys/types.h>
72 #include "fcntl-safer.h"
75 #include "stat-time.h"
82 # include <sys/time.h>
97 #if defined STDC_HEADERS || defined HAVE_STDLIB_H
108 # ifndef _D_EXACT_NAMLEN
109 # define _D_EXACT_NAMLEN(dp) strlen ((dp)->d_name)
114 # define CLOSEDIR(d) (closedir(d), 0)
116 # define CLOSEDIR(d) closedir(d)
119 #if !defined(HAVE_LSTAT) && !defined(lstat)
120 # define lstat(name, buf) stat(name, buf)
124 # include <utimens.h>
127 #define RW_USER (S_IRUSR | S_IWUSR) /* creation mode for open() */
130 # define MAX_PATH_LEN 1024 /* max pathname length */
142 off_t lseek OF((int fd, off_t offset, int whence));
146 #define OFF_T_MIN (~ (off_t) 0 << (sizeof (off_t) * CHAR_BIT - 1))
150 #define OFF_T_MAX (~ (off_t) 0 - OFF_T_MIN)
154 # define ELOOP EINVAL
157 /* Separator for file name parts (see shorten_name()) */
158 #ifdef NO_MULTIPLE_DOTS
159 # define PART_SEP "-"
161 # define PART_SEP "."
166 DECLARE(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
167 DECLARE(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
168 DECLARE(ush, d_buf, DIST_BUFSIZE);
169 DECLARE(uch, window, 2L*WSIZE);
171 DECLARE(ush, tab_prefix, 1L<<BITS);
173 DECLARE(ush, tab_prefix0, 1L<<(BITS-1));
174 DECLARE(ush, tab_prefix1, 1L<<(BITS-1));
177 /* local variables */
179 int ascii = 0; /* convert end-of-lines to local OS conventions */
180 int to_stdout = 0; /* output to stdout (-c) */
181 int decompress = 0; /* decompress (-d) */
182 int force = 0; /* don't ask questions, compress links (-f) */
183 int no_name = -1; /* don't save or restore the original file name */
184 int no_time = -1; /* don't save or restore the original file time */
185 int recursive = 0; /* recurse through directories (-r) */
186 int list = 0; /* list the file contents (-l) */
187 int verbose = 0; /* be verbose (-v) */
188 int quiet = 0; /* be very quiet (-q) */
189 int do_lzw = 0; /* generate output compatible with old compress (-Z) */
190 int test = 0; /* test .gz file integrity */
191 int foreground; /* set if program run in foreground */
192 char *program_name; /* program name */
193 int maxbits = BITS; /* max bits per code for LZW */
194 int method = DEFLATED;/* compression method */
195 int level = 6; /* compression level */
196 int exit_code = OK; /* program exit code */
197 int save_orig_name; /* set if original name must be saved */
198 int last_member; /* set for .zip and .Z files */
199 int part_nb; /* number of parts in .gz file */
200 struct timespec time_stamp; /* original time stamp (modification time) */
201 off_t ifile_size; /* input file size, -1 for devices (debug only) */
202 char *env; /* contents of GZIP env variable */
203 char **args = NULL; /* argv pointer if GZIP env variable defined */
204 char *z_suffix; /* default suffix (can be set with --suffix) */
205 size_t z_len; /* strlen(z_suffix) */
207 off_t bytes_in; /* number of input bytes */
208 off_t bytes_out; /* number of output bytes */
209 off_t total_in; /* input bytes for all files */
210 off_t total_out; /* output bytes for all files */
211 char ifname[MAX_PATH_LEN]; /* input file name */
212 char ofname[MAX_PATH_LEN]; /* output file name */
213 int volatile remove_ofname = 0; /* remove output file on error */
214 struct stat istat; /* status for input file */
215 int ifd; /* input file descriptor */
216 int ofd; /* output file descriptor */
217 unsigned insize; /* valid bytes in inbuf */
218 unsigned inptr; /* index of next byte to be processed in inbuf */
219 unsigned outcnt; /* bytes in output buffer */
221 struct option longopts[] =
223 /* { name has_arg *flag val } */
224 {"ascii", 0, 0, 'a'}, /* ascii text mode */
225 {"to-stdout", 0, 0, 'c'}, /* write output on standard output */
226 {"stdout", 0, 0, 'c'}, /* write output on standard output */
227 {"decompress", 0, 0, 'd'}, /* decompress */
228 {"uncompress", 0, 0, 'd'}, /* decompress */
229 /* {"encrypt", 0, 0, 'e'}, encrypt */
230 {"force", 0, 0, 'f'}, /* force overwrite of output file */
231 {"help", 0, 0, 'h'}, /* give help */
232 /* {"pkzip", 0, 0, 'k'}, force output in pkzip format */
233 {"list", 0, 0, 'l'}, /* list .gz file contents */
234 {"license", 0, 0, 'L'}, /* display software license */
235 {"no-name", 0, 0, 'n'}, /* don't save or restore original name & time */
236 {"name", 0, 0, 'N'}, /* save or restore original name & time */
237 {"quiet", 0, 0, 'q'}, /* quiet mode */
238 {"silent", 0, 0, 'q'}, /* quiet mode */
239 {"recursive", 0, 0, 'r'}, /* recurse through directories */
240 {"suffix", 1, 0, 'S'}, /* use given suffix instead of .gz */
241 {"test", 0, 0, 't'}, /* test compressed file integrity */
242 {"no-time", 0, 0, 'T'}, /* don't save or restore the time stamp */
243 {"verbose", 0, 0, 'v'}, /* verbose mode */
244 {"version", 0, 0, 'V'}, /* display version number */
245 {"fast", 0, 0, '1'}, /* compress faster */
246 {"best", 0, 0, '9'}, /* compress better */
247 {"lzw", 0, 0, 'Z'}, /* make output compatible with old compress */
248 {"bits", 1, 0, 'b'}, /* max number of bits per code (implies -Z) */
252 /* local functions */
254 local void try_help OF((void)) ATTRIBUTE_NORETURN;
255 local void help OF((void));
256 local void license OF((void));
257 local void version OF((void));
258 local int input_eof OF((void));
259 local void treat_stdin OF((void));
260 local void treat_file OF((char *iname));
261 local int create_outfile OF((void));
262 local char *get_suffix OF((char *name));
263 local int open_input_file OF((char *iname, struct stat *sbuf));
264 local int make_ofname OF((void));
265 local int same_file OF((struct stat *stat1, struct stat *stat2));
266 local int name_too_long OF((char *name, struct stat *statb));
267 local void shorten_name OF((char *name));
268 local int get_method OF((int in));
269 local void do_list OF((int ifd, int method));
270 local int check_ofname OF((void));
271 local void copy_stat OF((struct stat *ifstat));
272 local void remove_output_file OF((void));
273 local RETSIGTYPE abort_gzip_signal OF((int));
274 local void do_exit OF((int exitcode)) ATTRIBUTE_NORETURN;
275 int main OF((int argc, char **argv));
276 int (*work) OF((int infile, int outfile)) = zip; /* function to call */
279 local void treat_dir OF((int fd, char *dir));
282 #define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
287 fprintf (stderr, "Try `%s --help' for more information.\n",
292 /* ======================================================================== */
295 static char *help_msg[] = {
296 "Compress or uncompress FILEs (by default, compress FILES in-place).",
298 "Mandatory arguments to long options are mandatory for short options too.",
301 " -a, --ascii ascii text; convert end-of-line using local conventions",
303 " -c, --stdout write on standard output, keep original files unchanged",
304 " -d, --decompress decompress",
305 /* -e, --encrypt encrypt */
306 " -f, --force force overwrite of output file and compress links",
307 " -h, --help give this help",
308 /* -k, --pkzip force output in pkzip format */
309 " -l, --list list compressed file contents",
310 " -L, --license display software license",
312 " -m, --no-time do not save or restore the original modification time",
313 " -M, --time save or restore the original modification time",
315 " -n, --no-name do not save or restore the original name and time stamp",
316 " -N, --name save or restore the original name and time stamp",
317 " -q, --quiet suppress all warnings",
319 " -r, --recursive operate recursively on directories",
321 " -S, --suffix=SUF use suffix SUF on compressed files",
322 " -t, --test test compressed file integrity",
323 " -v, --verbose verbose mode",
324 " -V, --version display version number",
325 " -1, --fast compress faster",
326 " -9, --best compress better",
328 " -Z, --lzw produce output compatible with old compress",
329 " -b, --bits=BITS max number of bits per code (implies -Z)",
332 "With no FILE, or when FILE is -, read standard input.",
334 "Report bugs to <bug-gzip@gnu.org>.",
338 printf ("Usage: %s [OPTION]... [FILE]...\n", program_name);
339 while (*p) printf ("%s\n", *p++);
342 /* ======================================================================== */
345 char **p = license_msg;
347 printf ("%s %s\n", program_name, VERSION);
348 while (*p) printf ("%s\n", *p++);
351 /* ======================================================================== */
356 printf ("Written by Jean-loup Gailly.\n");
359 local void progerror (string)
363 fprintf (stderr, "%s: ", program_name);
369 /* ======================================================================== */
370 int main (argc, argv)
374 int file_count; /* number of files to process */
375 size_t proglen; /* length of program_name */
376 int optc; /* current option */
378 EXPAND(argc, argv); /* wild card expansion if necessary */
380 program_name = gzip_base_name (argv[0]);
381 proglen = strlen (program_name);
383 /* Suppress .exe for MSDOS, OS/2 and VMS: */
384 if (4 < proglen && strequ (program_name + proglen - 4, ".exe"))
385 program_name[proglen - 4] = '\0';
387 /* Add options in GZIP environment variable if there is one */
388 env = add_envopt(&argc, &argv, OPTIONS_VAR);
389 if (env != NULL) args = argv;
391 foreground = signal(SIGINT, SIG_IGN) != SIG_IGN;
393 signal (SIGINT, abort_gzip_signal);
396 if (signal(SIGTERM, SIG_IGN) != SIG_IGN) {
397 signal (SIGTERM, abort_gzip_signal);
401 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) {
402 signal (SIGHUP, abort_gzip_signal);
407 /* For compatibility with old compress, use program name as an option.
408 * If you compile with -DGNU_STANDARD, this program will behave as
409 * gzip even if it is invoked under the name gunzip or zcat.
411 * Systems which do not support links can still use -d or -dc.
412 * Ignore an .exe extension for MSDOS, OS/2 and VMS.
414 if (strncmp (program_name, "un", 2) == 0 /* ungzip, uncompress */
415 || strncmp (program_name, "gun", 3) == 0) /* gunzip */
417 else if (strequ (program_name + 1, "cat") /* zcat, pcat, gcat */
418 || strequ (program_name, "gzcat")) /* gzcat */
419 decompress = to_stdout = 1;
423 z_len = strlen(z_suffix);
425 while ((optc = getopt_long (argc, argv, "ab:cdfhH?lLmMnNqrS:tvVZ123456789",
426 longopts, (int *)0)) != -1) {
431 maxbits = atoi(optarg);
432 for (; *optarg; optarg++)
433 if (! ('0' <= *optarg && *optarg <= '9'))
435 fprintf (stderr, "%s: -b operand is not an integer\n",
441 to_stdout = 1; break;
443 decompress = 1; break;
447 help(); do_exit(OK); break;
449 list = decompress = to_stdout = 1; break;
451 license(); do_exit(OK); break;
452 case 'm': /* undocumented, may change later */
454 case 'M': /* undocumented, may change later */
457 no_name = no_time = 1; break;
459 no_name = no_time = 0; break;
461 quiet = 1; verbose = 0; break;
464 fprintf (stderr, "%s: -r not supported on this system\n",
472 #ifdef NO_MULTIPLE_DOTS
473 if (*optarg == '.') optarg++;
475 z_len = strlen(optarg);
479 test = decompress = to_stdout = 1;
482 verbose++; quiet = 0; break;
484 version(); do_exit(OK); break;
489 fprintf(stderr, "%s: -Z not supported in this version\n",
494 case '1': case '2': case '3': case '4':
495 case '5': case '6': case '7': case '8': case '9':
499 /* Error message already emitted by getopt_long. */
502 } /* loop on all arguments */
505 /* Ignore "Broken Pipe" message with --quiet */
506 if (quiet && signal (SIGPIPE, SIG_IGN) != SIG_IGN)
507 signal (SIGPIPE, abort_gzip_signal);
510 /* By default, save name and timestamp on compression but do not
511 * restore them on decompression.
513 if (no_time < 0) no_time = decompress;
514 if (no_name < 0) no_name = decompress;
516 file_count = argc - optind;
520 if (ascii && !quiet) {
521 fprintf(stderr, "%s: option --ascii ignored on this system\n",
525 if ((z_len == 0 && !decompress) || z_len > MAX_SUFFIX) {
526 fprintf(stderr, "%s: incorrect suffix '%s'\n",
527 program_name, z_suffix);
530 if (do_lzw && !decompress) work = lzw;
532 /* Allocate all global buffers (for DYN_ALLOC option) */
533 ALLOC(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
534 ALLOC(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
535 ALLOC(ush, d_buf, DIST_BUFSIZE);
536 ALLOC(uch, window, 2L*WSIZE);
538 ALLOC(ush, tab_prefix, 1L<<BITS);
540 ALLOC(ush, tab_prefix0, 1L<<(BITS-1));
541 ALLOC(ush, tab_prefix1, 1L<<(BITS-1));
544 /* And get to work */
545 if (file_count != 0) {
546 if (to_stdout && !test && !list && (!decompress || !ascii)) {
547 SET_BINARY_MODE(fileno(stdout));
549 while (optind < argc) {
550 treat_file(argv[optind++]);
552 } else { /* Standard input */
555 if (list && !quiet && file_count > 1) {
556 do_list(-1, -1); /* print totals */
559 return exit_code; /* just to avoid lint warning */
562 /* Return nonzero when at end of file on input. */
566 if (!decompress || last_member)
571 if (insize != INBUFSIZ || fill_inbuf (1) == EOF)
574 /* Unget the char that fill_inbuf got. */
581 /* ========================================================================
582 * Compress or decompress stdin
584 local void treat_stdin()
586 if (!force && !list &&
587 isatty(fileno((FILE *)(decompress ? stdin : stdout)))) {
588 /* Do not send compressed data to the terminal or read it from
589 * the terminal. We get here when user invoked the program
590 * without parameters, so be helpful. According to the GNU standards:
592 * If there is one behavior you think is most useful when the output
593 * is to a terminal, and another that you think is most useful when
594 * the output is a file or a pipe, then it is usually best to make
595 * the default behavior the one that is useful with output to a
596 * terminal, and have an option for the other behavior.
598 * Here we use the --force option to get the other behavior.
601 "%s: compressed data not %s a terminal. Use -f to force %scompression.\n",
602 program_name, decompress ? "read from" : "written to",
603 decompress ? "de" : "");
604 fprintf (stderr, "For help, type: %s -h\n", program_name);
608 if (decompress || !ascii) {
609 SET_BINARY_MODE(fileno(stdin));
611 if (!test && !list && (!decompress || !ascii)) {
612 SET_BINARY_MODE(fileno(stdout));
614 strcpy(ifname, "stdin");
615 strcpy(ofname, "stdout");
617 /* Get the time stamp on the input file. */
618 time_stamp.tv_nsec = -1; /* The time is unknown by default. */
620 #ifndef NO_STDIN_FSTAT
621 if (list || !no_time) {
622 if (fstat(fileno(stdin), &istat) != 0) {
623 progerror("standard input");
626 # ifdef NO_PIPE_TIMESTAMP
627 if (S_ISREG(istat.st_mode))
629 time_stamp = get_stat_mtime (&istat);
630 #endif /* NO_STDIN_FSTAT */
632 ifile_size = -1L; /* convention for unknown size */
634 clear_bufs(); /* clear input and output buffers */
639 method = get_method(ifd);
641 do_exit(exit_code); /* error message already emitted */
645 do_list(ifd, method);
649 /* Actually do the compression/decompression. Loop over zipped members.
652 if ((*work)(fileno(stdin), fileno(stdout)) != OK) return;
657 method = get_method(ifd);
658 if (method < 0) return; /* error message already emitted */
659 bytes_out = 0; /* required for length check */
664 fprintf(stderr, " OK\n");
666 } else if (!decompress) {
667 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
668 fprintf(stderr, "\n");
669 #ifdef DISPLAY_STDIN_RATIO
671 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
672 fprintf(stderr, "\n");
678 /* ========================================================================
679 * Compress or decompress the given file
681 local void treat_file(iname)
684 /* Accept "-" as synonym for stdin */
685 if (strequ(iname, "-")) {
686 int cflag = to_stdout;
692 /* Check if the input file is present, set ifname and istat: */
693 ifd = open_input_file (iname, &istat);
697 /* If the input name is that of a directory, recurse or ignore: */
698 if (S_ISDIR(istat.st_mode)) {
701 treat_dir (ifd, iname);
702 /* Warning: ifname is now garbage */
707 WARN ((stderr, "%s: %s is a directory -- ignored\n",
708 program_name, ifname));
711 if (!S_ISREG(istat.st_mode)) {
713 "%s: %s is not a directory or a regular file - ignored\n",
714 program_name, ifname));
719 if (istat.st_mode & S_ISUID)
721 WARN ((stderr, "%s: %s is set-user-ID on execution - ignored\n",
722 program_name, ifname));
726 if (istat.st_mode & S_ISGID)
728 WARN ((stderr, "%s: %s is set-group-ID on execution - ignored\n",
729 program_name, ifname));
733 if (istat.st_mode & S_ISVTX)
735 WARN ((stderr, "%s: %s has the sticky bit set - file ignored\n",
736 program_name, ifname));
741 if (istat.st_nlink > 1 && !to_stdout && !force) {
742 WARN((stderr, "%s: %s has %lu other link%c -- unchanged\n",
743 program_name, ifname, (unsigned long) istat.st_nlink - 1,
744 istat.st_nlink > 2 ? 's' : ' '));
749 ifile_size = istat.st_size;
750 if (no_time && !list)
751 time_stamp.tv_nsec = -1;
753 time_stamp = get_stat_mtime (&istat);
755 /* Generate output file name. For -r and (-t or -l), skip files
756 * without a valid gzip suffix (check done in make_ofname).
758 if (to_stdout && !list && !test) {
759 strcpy(ofname, "stdout");
761 } else if (make_ofname() != OK) {
766 clear_bufs(); /* clear input and output buffers */
770 method = get_method(ifd); /* updates ofname if original given */
773 return; /* error message already emitted */
777 do_list(ifd, method);
782 /* If compressing to a file, check if ofname is not ambiguous
783 * because the operating system truncates names. Otherwise, generate
784 * a new ofname and save the original name in the compressed file.
787 ofd = fileno(stdout);
788 /* keep remove_ofname as zero */
790 if (create_outfile() != OK) return;
792 if (!decompress && save_orig_name && !verbose && !quiet) {
793 fprintf(stderr, "%s: %s compressed to %s\n",
794 program_name, ifname, ofname);
797 /* Keep the name even if not truncated except with --no-name: */
798 if (!save_orig_name) save_orig_name = !no_name;
801 fprintf(stderr, "%s:\t", ifname);
804 /* Actually do the compression/decompression. Loop over zipped members.
807 if ((*work)(ifd, ofd) != OK) {
808 method = -1; /* force cleanup */
815 method = get_method(ifd);
816 if (method < 0) break; /* error message already emitted */
817 bytes_out = 0; /* required for length check */
825 if (close (ofd) != 0)
829 /* It's now safe to remove the input file. */
830 if (xunlink (ifname) != 0)
833 WARN ((stderr, "%s: ", program_name));
843 if (!to_stdout) xunlink (ofname);
846 /* Display statistics */
849 fprintf(stderr, " OK");
850 } else if (decompress) {
851 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
853 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
855 if (!test && !to_stdout) {
856 fprintf(stderr, " -- replaced with %s", ofname);
858 fprintf(stderr, "\n");
862 /* ========================================================================
863 * Create the output file. Return OK or ERROR.
864 * Try several times if necessary to avoid truncating the z_suffix. For
865 * example, do not create a compressed file of name "1234567890123."
866 * Sets save_orig_name to true if the file name has been truncated.
867 * IN assertions: the input file has already been open (ifd is set) and
868 * ofname has already been updated if there was an original name.
869 * OUT assertions: ifd and ofd are closed in case of error.
871 local int create_outfile()
873 struct stat ostat; /* stat for ofname */
874 int flags = O_WRONLY | O_CREAT | O_EXCL | O_BINARY;
876 if (ascii && decompress) {
877 flags &= ~O_BINARY; /* force ascii text mode */
880 /* Make sure that ofname is not an existing file */
881 if (check_ofname() != OK) {
885 /* Create the output file */
887 ofd = OPEN(ofname, flags, RW_USER);
894 /* Check for name truncation on new file (1234567890123.gz) */
896 if (stat(ofname, &ostat) != 0) {
898 if (fstat(ofd, &ostat) != 0) {
901 close(ifd); close(ofd);
905 if (!name_too_long(ofname, &ostat)) return OK;
908 /* name might be too long if an original name was saved */
909 WARN((stderr, "%s: %s: warning, name truncated\n",
910 program_name, ofname));
915 #ifdef NO_MULTIPLE_DOTS
916 /* Should never happen, see check_ofname() */
917 fprintf (stderr, "%s: %s: name too long\n", program_name, ofname);
920 shorten_name(ofname);
924 /* ========================================================================
925 * Return a pointer to the 'z' suffix of a file name, or NULL. For all
926 * systems, ".gz", ".z", ".Z", ".taz", ".tgz", "-gz", "-z" and "_z" are
927 * accepted suffixes, in addition to the value of the --suffix option.
928 * ".tgz" is a useful convention for tar.z files on systems limited
929 * to 3 characters extensions. On such systems, ".?z" and ".??z" are
930 * also accepted suffixes. For Unix, we do not want to accept any
931 * .??z suffix as indicating a compressed file; some people use .xyz
932 * to denote volume data.
933 * On systems allowing multiple versions of the same file (such as VMS),
934 * this function removes any version suffix in the given name.
936 local char *get_suffix(name)
940 char suffix[MAX_SUFFIX+3]; /* last chars of name, forced to lower case */
941 static char *known_suffixes[] =
942 {NULL, ".gz", ".z", ".taz", ".tgz", "-gz", "-z", "_z",
947 char **suf = known_suffixes;
950 if (strequ(z_suffix, "z")) suf++; /* check long suffixes first */
953 /* strip a version number from the file name */
955 char *v = strrchr(name, SUFFIX_SEP);
956 if (v != NULL) *v = '\0';
960 if (nlen <= MAX_SUFFIX+2) {
961 strcpy(suffix, name);
963 strcpy(suffix, name+nlen-MAX_SUFFIX-2);
966 slen = strlen(suffix);
968 int s = strlen(*suf);
969 if (slen > s && suffix[slen-s-1] != PATH_SEP
970 && strequ(suffix + slen - s, *suf)) {
973 } while (*++suf != NULL);
979 /* Open file NAME with the given flags and mode and store its status
980 into *ST. Return a file descriptor to the newly opened file, or -1
981 (setting errno) on failure. */
983 open_and_stat (char *name, int flags, mode_t mode, struct stat *st)
987 /* Refuse to follow symbolic links unless -c or -f. */
988 if (!to_stdout && !force)
992 else if (lstat (name, st) == 0 && S_ISLNK (st->st_mode))
999 fd = OPEN (name, flags, mode);
1000 if (0 <= fd && fstat (fd, st) != 0)
1011 /* ========================================================================
1012 * Set ifname to the input file name (with a suffix appended if necessary)
1013 * and istat to its stats. For decompression, if no file exists with the
1014 * original name, try adding successively z_suffix, .gz, .z, -z and .Z.
1015 * For MSDOS, we try only z_suffix and z.
1016 * Return an open file descriptor or -1.
1019 open_input_file (iname, sbuf)
1023 int ilen; /* strlen(ifname) */
1024 int z_suffix_errno = 0;
1025 static char *suffixes[] = {NULL, ".gz", ".z", "-z", ".Z", NULL};
1026 char **suf = suffixes;
1028 #ifdef NO_MULTIPLE_DOTS
1029 char *dot; /* pointer to ifname extension, or NULL */
1032 int open_flags = ascii && !decompress ? O_RDONLY : O_RDONLY | O_BINARY;
1036 if (sizeof ifname - 1 <= strlen (iname))
1039 strcpy(ifname, iname);
1041 /* If input file exists, return OK. */
1042 fd = open_and_stat (ifname, open_flags, RW_USER, sbuf);
1046 if (!decompress || errno != ENOENT) {
1050 /* file.ext doesn't exist, try adding a suffix (after removing any
1051 * version number for VMS).
1053 s = get_suffix(ifname);
1055 progerror(ifname); /* ifname already has z suffix and does not exist */
1058 #ifdef NO_MULTIPLE_DOTS
1059 dot = strrchr(ifname, '.');
1061 strcat(ifname, ".");
1062 dot = strrchr(ifname, '.');
1065 ilen = strlen(ifname);
1066 if (strequ(z_suffix, ".gz")) suf++;
1068 /* Search for all suffixes */
1070 char *s0 = s = *suf;
1071 strcpy (ifname, iname);
1072 #ifdef NO_MULTIPLE_DOTS
1074 if (*dot == '\0') strcpy (dot, ".");
1076 #ifdef MAX_EXT_CHARS
1077 if (MAX_EXT_CHARS < strlen (s) + strlen (dot + 1))
1078 dot[MAX_EXT_CHARS + 1 - strlen (s)] = '\0';
1080 if (sizeof ifname <= ilen + strlen (s))
1083 fd = open_and_stat (ifname, open_flags, RW_USER, sbuf);
1086 if (errno != ENOENT)
1091 if (strequ (s0, z_suffix))
1092 z_suffix_errno = errno;
1093 } while (*++suf != NULL);
1095 /* No suffix found, complain using z_suffix: */
1096 strcpy(ifname, iname);
1097 #ifdef NO_MULTIPLE_DOTS
1098 if (*dot == '\0') strcpy(dot, ".");
1100 #ifdef MAX_EXT_CHARS
1101 if (MAX_EXT_CHARS < z_len + strlen (dot + 1))
1102 dot[MAX_EXT_CHARS + 1 - z_len] = '\0';
1104 strcat(ifname, z_suffix);
1105 errno = z_suffix_errno;
1110 fprintf (stderr, "%s: %s: file name too long\n", program_name, iname);
1115 /* ========================================================================
1116 * Generate ofname given ifname. Return OK, or WARNING if file must be skipped.
1117 * Sets save_orig_name to true if the file name has been truncated.
1119 local int make_ofname()
1121 char *suff; /* ofname z suffix */
1123 strcpy(ofname, ifname);
1124 /* strip a version number if any and get the gzip suffix if present: */
1125 suff = get_suffix(ofname);
1129 /* With -t or -l, try all files (even without .gz suffix)
1130 * except with -r (behave as with just -dr).
1132 if (!recursive && (list || test)) return OK;
1134 /* Avoid annoying messages with -r */
1135 if (verbose || (!recursive && !quiet)) {
1136 WARN((stderr,"%s: %s: unknown suffix -- ignored\n",
1137 program_name, ifname));
1141 /* Make a special case for .tgz and .taz: */
1143 if (strequ(suff, ".tgz") || strequ(suff, ".taz")) {
1144 strcpy(suff, ".tar");
1146 *suff = '\0'; /* strip the z suffix */
1148 /* ofname might be changed later if infile contains an original name */
1150 } else if (suff != NULL) {
1151 /* Avoid annoying messages with -r (see treat_dir()) */
1152 if (verbose || (!recursive && !quiet)) {
1153 /* Don't use WARN, as it affects exit status. */
1154 fprintf (stderr, "%s: %s already has %s suffix -- unchanged\n",
1155 program_name, ifname, suff);
1161 #ifdef NO_MULTIPLE_DOTS
1162 suff = strrchr(ofname, '.');
1164 if (sizeof ofname <= strlen (ofname) + 1)
1166 strcat(ofname, ".");
1167 # ifdef MAX_EXT_CHARS
1168 if (strequ(z_suffix, "z")) {
1169 if (sizeof ofname <= strlen (ofname) + 2)
1171 strcat(ofname, "gz"); /* enough room */
1174 /* On the Atari and some versions of MSDOS, name_too_long()
1175 * does not work correctly because of a bug in stat(). So we
1176 * must truncate here.
1178 } else if (strlen(suff)-1 + z_len > MAX_SUFFIX) {
1179 suff[MAX_SUFFIX+1-z_len] = '\0';
1183 #endif /* NO_MULTIPLE_DOTS */
1184 if (sizeof ofname <= strlen (ofname) + z_len)
1186 strcat(ofname, z_suffix);
1188 } /* decompress ? */
1192 WARN ((stderr, "%s: %s: file name too long\n", program_name, ifname));
1197 /* ========================================================================
1198 * Check the magic number of the input file and update ofname if an
1199 * original name was given and to_stdout is not set.
1200 * Return the compression method, -1 for error, -2 for warning.
1201 * Set inptr to the offset of the next byte to be processed.
1202 * Updates time_stamp if there is one and --no-time is not used.
1203 * This function may be called repeatedly for an input file consisting
1204 * of several contiguous gzip'ed members.
1205 * IN assertions: there is at least one remaining compressed member.
1206 * If the member is a zip file, it must be the only one.
1208 local int get_method(in)
1209 int in; /* input file descriptor */
1211 uch flags; /* compression flags */
1212 char magic[2]; /* magic header */
1213 int imagic1; /* like magic[1], but can represent EOF */
1214 ulg stamp; /* time stamp */
1216 /* If --force and --stdout, zcat == cat, so do not complain about
1217 * premature end of file: use try_byte instead of get_byte.
1219 if (force && to_stdout) {
1220 magic[0] = (char)try_byte();
1221 imagic1 = try_byte ();
1222 magic[1] = (char) imagic1;
1223 /* If try_byte returned EOF, magic[1] == (char) EOF. */
1225 magic[0] = (char)get_byte();
1226 magic[1] = (char)get_byte();
1227 imagic1 = 0; /* avoid lint warning */
1229 method = -1; /* unknown yet */
1230 part_nb++; /* number of parts in gzip file */
1232 last_member = RECORD_IO;
1233 /* assume multiple members in gzip file except for record oriented I/O */
1235 if (memcmp(magic, GZIP_MAGIC, 2) == 0
1236 || memcmp(magic, OLD_GZIP_MAGIC, 2) == 0) {
1238 method = (int)get_byte();
1239 if (method != DEFLATED) {
1241 "%s: %s: unknown method %d -- not supported\n",
1242 program_name, ifname, method);
1247 flags = (uch)get_byte();
1249 if ((flags & ENCRYPTED) != 0) {
1251 "%s: %s is encrypted -- not supported\n",
1252 program_name, ifname);
1256 if ((flags & CONTINUATION) != 0) {
1258 "%s: %s is a a multi-part gzip file -- not supported\n",
1259 program_name, ifname);
1261 if (force <= 1) return -1;
1263 if ((flags & RESERVED) != 0) {
1265 "%s: %s has flags 0x%x -- not supported\n",
1266 program_name, ifname, flags);
1268 if (force <= 1) return -1;
1270 stamp = (ulg)get_byte();
1271 stamp |= ((ulg)get_byte()) << 8;
1272 stamp |= ((ulg)get_byte()) << 16;
1273 stamp |= ((ulg)get_byte()) << 24;
1274 if (stamp != 0 && !no_time)
1276 time_stamp.tv_sec = stamp;
1277 time_stamp.tv_nsec = 0;
1280 (void)get_byte(); /* Ignore extra flags for the moment */
1281 (void)get_byte(); /* Ignore OS type for the moment */
1283 if ((flags & CONTINUATION) != 0) {
1284 unsigned part = (unsigned)get_byte();
1285 part |= ((unsigned)get_byte())<<8;
1287 fprintf(stderr,"%s: %s: part number %u\n",
1288 program_name, ifname, part);
1291 if ((flags & EXTRA_FIELD) != 0) {
1292 unsigned len = (unsigned)get_byte();
1293 len |= ((unsigned)get_byte())<<8;
1295 fprintf(stderr,"%s: %s: extra field of %u bytes ignored\n",
1296 program_name, ifname, len);
1298 while (len--) (void)get_byte();
1301 /* Get original file name if it was truncated */
1302 if ((flags & ORIG_NAME) != 0) {
1303 if (no_name || (to_stdout && !list) || part_nb > 1) {
1304 /* Discard the old name */
1305 char c; /* dummy used for NeXTstep 3.0 cc optimizer bug */
1306 do {c=get_byte();} while (c != 0);
1308 /* Copy the base name. Keep a directory prefix intact. */
1309 char *p = gzip_base_name (ofname);
1312 *p = (char)get_char();
1313 if (*p++ == '\0') break;
1314 if (p >= ofname+sizeof(ofname)) {
1315 gzip_error ("corrupted input -- file name too large");
1318 p = gzip_base_name (base);
1319 memmove (base, p, strlen (p) + 1);
1320 /* If necessary, adapt the name to local OS conventions: */
1322 MAKE_LEGAL_NAME(base);
1323 if (base) list=0; /* avoid warning about unused variable */
1325 } /* no_name || to_stdout */
1328 /* Discard file comment if any */
1329 if ((flags & COMMENT) != 0) {
1330 while (get_char() != 0) /* null */ ;
1333 header_bytes = inptr + 2*sizeof(long); /* include crc and size */
1336 } else if (memcmp(magic, PKZIP_MAGIC, 2) == 0 && inptr == 2
1337 && memcmp((char*)inbuf, PKZIP_MAGIC, 4) == 0) {
1338 /* To simplify the code, we support a zip file when alone only.
1339 * We are thus guaranteed that the entire local header fits in inbuf.
1343 if (check_zipfile(in) != OK) return -1;
1344 /* check_zipfile may get ofname from the local header */
1347 } else if (memcmp(magic, PACK_MAGIC, 2) == 0) {
1351 } else if (memcmp(magic, LZW_MAGIC, 2) == 0) {
1353 method = COMPRESSED;
1356 } else if (memcmp(magic, LZH_MAGIC, 2) == 0) {
1361 } else if (force && to_stdout && !list) { /* pass input unchanged */
1367 if (method >= 0) return method;
1370 fprintf (stderr, "\n%s: %s: not in gzip format\n",
1371 program_name, ifname);
1378 for (inbyte = imagic1; inbyte == 0; inbyte = try_byte ())
1383 WARN ((stderr, "\n%s: %s: decompression OK, trailing zero bytes ignored\n",
1384 program_name, ifname));
1389 WARN((stderr, "\n%s: %s: decompression OK, trailing garbage ignored\n",
1390 program_name, ifname));
1395 /* ========================================================================
1396 * Display the characteristics of the compressed file.
1397 * If the given method is < 0, display the accumulated totals.
1398 * IN assertions: time_stamp, header_bytes and ifile_size are initialized.
1400 local void do_list(ifd, method)
1401 int ifd; /* input file descriptor */
1402 int method; /* compression method */
1404 ulg crc; /* original crc */
1405 static int first_time = 1;
1406 static char* methods[MAX_METHODS] = {
1411 "", "", "", "", /* 4 to 7 reserved */
1413 int positive_off_t_width = 1;
1416 for (o = OFF_T_MAX; 9 < o; o /= 10) {
1417 positive_off_t_width++;
1420 if (first_time && method >= 0) {
1423 printf("method crc date time ");
1426 printf("%*.*s %*.*s ratio uncompressed_name\n",
1427 positive_off_t_width, positive_off_t_width, "compressed",
1428 positive_off_t_width, positive_off_t_width, "uncompressed");
1430 } else if (method < 0) {
1431 if (total_in <= 0 || total_out <= 0) return;
1435 if (verbose || !quiet) {
1436 fprint_off(stdout, total_in, positive_off_t_width);
1438 fprint_off(stdout, total_out, positive_off_t_width);
1441 display_ratio(total_out-(total_in-header_bytes), total_out, stdout);
1442 /* header_bytes is not meaningful but used to ensure the same
1443 * ratio if there is a single file.
1445 printf(" (totals)\n");
1448 crc = (ulg)~0; /* unknown */
1450 bytes_in = ifile_size;
1453 if (method == DEFLATED && !last_member) {
1454 /* Get the crc and uncompressed size for gzip'ed (not zip'ed) files.
1455 * If the lseek fails, we could use read() to get to the end, but
1456 * --list is used to get quick results.
1457 * Use "gunzip < foo.gz | wc -c" to get the uncompressed size if
1458 * you are not concerned about speed.
1460 bytes_in = lseek(ifd, (off_t)(-8), SEEK_END);
1461 if (bytes_in != -1L) {
1464 if (read(ifd, (char*)buf, sizeof(buf)) != sizeof(buf)) {
1468 bytes_out = LG(buf+4);
1471 #endif /* RECORD_IO */
1474 struct tm *tm = localtime (&time_stamp.tv_sec);
1475 printf ("%5s %08lx ", methods[method], crc);
1477 printf ("%s%3d %02d:%02d ",
1478 ("Jan\0Feb\0Mar\0Apr\0May\0Jun\0Jul\0Aug\0Sep\0Oct\0Nov\0Dec"
1480 tm->tm_mday, tm->tm_hour, tm->tm_min);
1482 printf ("??? ?? ??:?? ");
1484 fprint_off(stdout, bytes_in, positive_off_t_width);
1486 fprint_off(stdout, bytes_out, positive_off_t_width);
1488 if (bytes_in == -1L) {
1490 bytes_in = bytes_out = header_bytes = 0;
1491 } else if (total_in >= 0) {
1492 total_in += bytes_in;
1494 if (bytes_out == -1L) {
1496 bytes_in = bytes_out = header_bytes = 0;
1497 } else if (total_out >= 0) {
1498 total_out += bytes_out;
1500 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out, stdout);
1501 printf(" %s\n", ofname);
1504 /* ========================================================================
1505 * Return true if the two stat structures correspond to the same file.
1507 local int same_file(stat1, stat2)
1511 return stat1->st_ino == stat2->st_ino
1512 && stat1->st_dev == stat2->st_dev
1514 /* Can't rely on st_ino and st_dev, use other fields: */
1515 && stat1->st_mode == stat2->st_mode
1516 && stat1->st_uid == stat2->st_uid
1517 && stat1->st_gid == stat2->st_gid
1518 && stat1->st_size == stat2->st_size
1519 && stat1->st_atime == stat2->st_atime
1520 && stat1->st_mtime == stat2->st_mtime
1521 && stat1->st_ctime == stat2->st_ctime
1526 /* ========================================================================
1527 * Return true if a file name is ambiguous because the operating system
1528 * truncates file names.
1530 local int name_too_long(name, statb)
1531 char *name; /* file name to check */
1532 struct stat *statb; /* stat buf for this file name */
1534 int s = strlen(name);
1536 struct stat tstat; /* stat for truncated name */
1539 tstat = *statb; /* Just in case OS does not fill all fields */
1541 res = lstat(name, &tstat) == 0 && same_file(statb, &tstat);
1543 Trace((stderr, " too_long(%s) => %d\n", name, res));
1547 /* ========================================================================
1548 * Shorten the given name by one character, or replace a .tar extension
1549 * with .tgz. Truncate the last part of the name which is longer than
1550 * MIN_PART characters: 1234.678.012.gz -> 123.678.012.gz. If the name
1551 * has only parts shorter than MIN_PART truncate the longest part.
1552 * For decompression, just remove the last character of the name.
1554 * IN assertion: for compression, the suffix of the given name is z_suffix.
1556 local void shorten_name(name)
1559 int len; /* length of name without z_suffix */
1560 char *trunc = NULL; /* character to be truncated */
1561 int plen; /* current part length */
1562 int min_part = MIN_PART; /* current minimum part length */
1568 gzip_error ("name too short");
1572 p = get_suffix(name);
1574 gzip_error ("can't recover suffix\n");
1578 /* compress 1234567890.tar to 1234567890.tgz */
1579 if (len > 4 && strequ(p-4, ".tar")) {
1580 strcpy(p-4, ".tgz");
1583 /* Try keeping short extensions intact:
1584 * 1234.678.012.gz -> 123.678.012.gz
1587 p = strrchr(name, PATH_SEP);
1590 plen = strcspn(p, PART_SEP);
1592 if (plen > min_part) trunc = p-1;
1595 } while (trunc == NULL && --min_part != 0);
1597 if (trunc != NULL) {
1599 trunc[0] = trunc[1];
1603 trunc = strrchr(name, PART_SEP[0]);
1605 gzip_error ("internal error in shorten_name");
1606 if (trunc[1] == '\0') trunc--; /* force truncation */
1608 strcpy(trunc, z_suffix);
1611 /* ========================================================================
1612 * If compressing to a file, check if ofname is not ambiguous
1613 * because the operating system truncates names. Otherwise, generate
1614 * a new ofname and save the original name in the compressed file.
1615 * If the compressed file already exists, ask for confirmation.
1616 * The check for name truncation is made dynamically, because different
1617 * file systems on the same OS might use different truncation rules (on SVR4
1618 * s5 truncates to 14 chars and ufs does not truncate).
1619 * This function returns -1 if the file must be skipped, and
1620 * updates save_orig_name if necessary.
1621 * IN assertions: save_orig_name is already set if ofname has been
1622 * already truncated because of NO_MULTIPLE_DOTS. The input file has
1623 * already been open and istat is set.
1625 local int check_ofname()
1627 struct stat ostat; /* stat for ofname */
1630 /* Check for strictly conforming Posix systems (which return ENAMETOOLONG
1631 * instead of silently truncating filenames).
1634 while (lstat(ofname, &ostat) != 0) {
1635 if (errno != ENAMETOOLONG) return 0; /* ofname does not exist */
1636 shorten_name(ofname);
1639 if (lstat(ofname, &ostat) != 0) return 0;
1641 /* Check for name truncation on existing file. Do this even on systems
1642 * defining ENAMETOOLONG, because on most systems the strict Posix
1643 * behavior is disabled by default (silent name truncation allowed).
1645 if (!decompress && name_too_long(ofname, &ostat)) {
1646 shorten_name(ofname);
1647 if (lstat(ofname, &ostat) != 0) return 0;
1650 /* Check that the input and output files are different (could be
1651 * the same by name truncation or links).
1653 if (same_file(&istat, &ostat)) {
1654 if (strequ(ifname, ofname)) {
1655 fprintf(stderr, "%s: %s: cannot %scompress onto itself\n",
1656 program_name, ifname, decompress ? "de" : "");
1658 fprintf(stderr, "%s: %s and %s are the same file\n",
1659 program_name, ifname, ofname);
1664 /* Ask permission to overwrite the existing file */
1667 fprintf (stderr, "%s: %s already exists;", program_name, ofname);
1668 if (foreground && isatty(fileno(stdin))) {
1669 fprintf(stderr, " do you wish to overwrite (y or n)? ");
1674 fprintf(stderr, "\tnot overwritten\n");
1675 if (exit_code == OK) exit_code = WARNING;
1679 if (xunlink (ofname)) {
1687 /* ========================================================================
1688 * Copy modes, times, ownership from input file to output file.
1689 * IN assertion: to_stdout is false.
1691 local void copy_stat(ifstat)
1692 struct stat *ifstat;
1694 mode_t mode = ifstat->st_mode & S_IRWXUGO;
1698 struct timespec timespec[2];
1699 timespec[0] = get_stat_atime (ifstat);
1700 timespec[1] = get_stat_mtime (ifstat);
1702 if (decompress && 0 <= time_stamp.tv_nsec
1703 && ! (timespec[1].tv_sec == time_stamp.tv_sec
1704 && timespec[1].tv_nsec == time_stamp.tv_nsec))
1706 timespec[1] = time_stamp;
1708 fprintf(stderr, "%s: time stamp restored\n", ofname);
1712 if (futimens (ofd, ofname, timespec) != 0)
1715 WARN ((stderr, "%s: ", program_name));
1726 fchown (ofd, ifstat->st_uid, ifstat->st_gid); /* Copy ownership */
1728 chown(ofname, ifstat->st_uid, ifstat->st_gid); /* Copy ownership */
1732 /* Copy the protection modes */
1734 r = fchmod (ofd, mode);
1736 r = chmod (ofname, mode);
1740 WARN ((stderr, "%s: ", program_name));
1750 /* ========================================================================
1751 * Recurse through the given directory. This code is taken from ncompress.
1753 local void treat_dir (fd, dir)
1759 char nbuf[MAX_PATH_LEN];
1762 dirp = fdopendir (fd);
1770 ** WARNING: the following algorithm could occasionally cause
1771 ** compress to produce error warnings of the form "<filename>.gz
1772 ** already has .gz suffix - ignored". This occurs when the
1773 ** .gz output file is inserted into the directory below
1774 ** readdir's current pointer.
1775 ** These warnings are harmless but annoying, so they are suppressed
1776 ** with option -r (except when -v is on). An alternative
1777 ** to allowing this would be to store the entire directory
1778 ** list in memory, then compress the entries in the stored
1779 ** list. Given the depth-first recursive algorithm used here,
1780 ** this could use up a tremendous amount of memory. I don't
1781 ** think it's worth it. -- Dave Mack
1782 ** (An other alternative might be two passes to avoid depth-first.)
1785 while ((errno = 0, dp = readdir(dirp)) != NULL) {
1787 if (strequ(dp->d_name,".") || strequ(dp->d_name,"..")) {
1791 if (len + _D_EXACT_NAMLEN (dp) + 1 < MAX_PATH_LEN - 1) {
1793 if (len != 0 /* dir = "" means current dir on Amiga */
1795 && dir[len-1] != PATH_SEP2
1798 && dir[len-1] != PATH_SEP3
1801 nbuf[len++] = PATH_SEP;
1803 strcpy(nbuf+len, dp->d_name);
1806 fprintf(stderr,"%s: %s/%s: pathname too long\n",
1807 program_name, dir, dp->d_name);
1813 if (CLOSEDIR(dirp) != 0)
1816 #endif /* ! NO_DIR */
1818 /* ========================================================================
1819 * Free all dynamically allocated variables and exit with the given code.
1821 local void do_exit(exitcode)
1824 static int in_exit = 0;
1826 if (in_exit) exit(exitcode);
1828 if (env != NULL) free(env), env = NULL;
1829 if (args != NULL) free((char*)args), args = NULL;
1843 /* ========================================================================
1844 * Close and unlink the output file.
1847 remove_output_file ()
1849 if (remove_ofname) {
1855 /* ========================================================================
1861 remove_output_file ();
1865 /* ========================================================================
1869 abort_gzip_signal (sig)
1872 remove_output_file ();
1873 signal (sig, SIG_DFL);