1 /* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
2 * Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc.
3 * Copyright (C) 1992-1993 Jean-loup Gailly
4 * The unzip code was written and put in the public domain by Mark Adler.
5 * Portions of the lzw code are derived from the public domain 'compress'
6 * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
7 * Ken Turkowski, Dave Mack and Peter Jannesen.
9 * See the license_msg below and the file COPYING for the software license.
10 * See the file algorithm.doc for the compression algorithms and file formats.
13 static char *license_msg[] = {
14 "Copyright 2002 Free Software Foundation",
15 "Copyright 1992-1993 Jean-loup Gailly",
16 "This program comes with ABSOLUTELY NO WARRANTY.",
17 "You may redistribute copies of this program",
18 "under the terms of the GNU General Public License.",
19 "For more information about these matters, see the file named COPYING.",
22 /* Compress files with zip algorithm and 'compress' interface.
23 * See usage() and help() functions below for all options.
25 * file.gz: compressed file with same mode, owner, and utimes
26 * or stdout with -c option or if stdin used as input.
27 * If the output file name had to be truncated, the original name is kept
28 * in the compressed file.
29 * On MSDOS, file.tmp -> file.tmz. On VMS, file.tmp -> file.tmp-gz.
31 * Using gz on MSDOS would create too many file name conflicts. For
32 * example, foo.txt -> foo.tgz (.tgz must be reserved as shorthand for
33 * tar.gz). Similarly, foo.dir and foo.doc would both be mapped to foo.dgz.
34 * I also considered 12345678.txt -> 12345txt.gz but this truncates the name
35 * too heavily. There is no ideal solution given the MSDOS 8+3 limitation.
37 * For the meaning of all compilation flags, see comments in Makefile.in.
41 static char rcsid[] = "$Id: gzip.c,v 0.24 1993/06/24 10:52:07 jloup Exp $";
46 #include <sys/types.h>
62 # include <sys/time.h>
77 #if defined STDC_HEADERS || defined HAVE_STDLIB_H
85 # define NAMLEN(direct) strlen((direct)->d_name)
86 # define DIR_OPT "DIRENT"
88 # define dirent direct
89 # define NAMLEN(direct) ((direct)->d_namlen)
90 # ifdef HAVE_SYS_NDIR_H
91 # include <sys/ndir.h>
92 # define DIR_OPT "SYS_NDIR"
94 # ifdef HAVE_SYS_DIR_H
96 # define DIR_OPT "SYS_DIR"
100 # define DIR_OPT "NDIR"
103 # define DIR_OPT "NO_DIR"
111 # define CLOSEDIR(d) (closedir(d), 0)
113 # define CLOSEDIR(d) closedir(d)
116 #if !defined(HAVE_LSTAT) && !defined(lstat)
117 # define lstat(name, buf) stat(name, buf)
123 # define TIME_OPT "UTIME"
125 # ifdef HAVE_SYS_UTIME_H
126 # include <sys/utime.h>
127 # define TIME_OPT "SYS_UTIME"
133 # define TIME_OPT "STRUCT_UTIMBUF"
137 # define TIME_OPT "NO_UTIME"
140 #if !defined(S_ISDIR) && defined(S_IFDIR)
141 # define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
143 #if !defined(S_ISREG) && defined(S_IFREG)
144 # define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
147 typedef RETSIGTYPE (*sig_type) OF((int));
150 # define O_BINARY 0 /* creation mode for open() */
154 /* Pure BSD system? */
155 # include <sys/file.h>
157 # define O_CREAT FCREAT
160 # define O_EXCL FEXCL
165 # define S_IRUSR 0400
168 # define S_IWUSR 0200
170 #define RW_USER (S_IRUSR | S_IWUSR) /* creation mode for open() */
173 # define MAX_PATH_LEN 1024 /* max pathname length */
185 off_t lseek OF((int fd, off_t offset, int whence));
189 #define OFF_T_MIN (~ (off_t) 0 << (sizeof (off_t) * CHAR_BIT - 1))
193 #define OFF_T_MAX (~ (off_t) 0 - OFF_T_MIN)
196 /* Separator for file name parts (see shorten_name()) */
197 #ifdef NO_MULTIPLE_DOTS
198 # define PART_SEP "-"
200 # define PART_SEP "."
205 DECLARE(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
206 DECLARE(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
207 DECLARE(ush, d_buf, DIST_BUFSIZE);
208 DECLARE(uch, window, 2L*WSIZE);
210 DECLARE(ush, tab_prefix, 1L<<BITS);
212 DECLARE(ush, tab_prefix0, 1L<<(BITS-1));
213 DECLARE(ush, tab_prefix1, 1L<<(BITS-1));
216 /* local variables */
218 int ascii = 0; /* convert end-of-lines to local OS conventions */
219 int to_stdout = 0; /* output to stdout (-c) */
220 int decompress = 0; /* decompress (-d) */
221 int force = 0; /* don't ask questions, compress links (-f) */
222 int no_name = -1; /* don't save or restore the original file name */
223 int no_time = -1; /* don't save or restore the original file time */
224 int recursive = 0; /* recurse through directories (-r) */
225 int list = 0; /* list the file contents (-l) */
226 int verbose = 0; /* be verbose (-v) */
227 int quiet = 0; /* be very quiet (-q) */
228 int do_lzw = 0; /* generate output compatible with old compress (-Z) */
229 int test = 0; /* test .gz file integrity */
230 int foreground; /* set if program run in foreground */
231 char *progname; /* program name */
232 int maxbits = BITS; /* max bits per code for LZW */
233 int method = DEFLATED;/* compression method */
234 int level = 6; /* compression level */
235 int exit_code = OK; /* program exit code */
236 int save_orig_name; /* set if original name must be saved */
237 int last_member; /* set for .zip and .Z files */
238 int part_nb; /* number of parts in .gz file */
239 time_t time_stamp; /* original time stamp (modification time) */
240 off_t ifile_size; /* input file size, -1 for devices (debug only) */
241 char *env; /* contents of GZIP env variable */
242 char **args = NULL; /* argv pointer if GZIP env variable defined */
243 char *z_suffix; /* default suffix (can be set with --suffix) */
244 size_t z_len; /* strlen(z_suffix) */
246 off_t bytes_in; /* number of input bytes */
247 off_t bytes_out; /* number of output bytes */
248 off_t total_in; /* input bytes for all files */
249 off_t total_out; /* output bytes for all files */
250 char ifname[MAX_PATH_LEN]; /* input file name */
251 char ofname[MAX_PATH_LEN]; /* output file name */
252 int remove_ofname = 0; /* remove output file on error */
253 struct stat istat; /* status for input file */
254 int ifd; /* input file descriptor */
255 int ofd; /* output file descriptor */
256 unsigned insize; /* valid bytes in inbuf */
257 unsigned inptr; /* index of next byte to be processed in inbuf */
258 unsigned outcnt; /* bytes in output buffer */
259 int rsync = 0; /* make ryncable chunks */
261 struct option longopts[] =
263 /* { name has_arg *flag val } */
264 {"ascii", 0, 0, 'a'}, /* ascii text mode */
265 {"to-stdout", 0, 0, 'c'}, /* write output on standard output */
266 {"stdout", 0, 0, 'c'}, /* write output on standard output */
267 {"decompress", 0, 0, 'd'}, /* decompress */
268 {"uncompress", 0, 0, 'd'}, /* decompress */
269 /* {"encrypt", 0, 0, 'e'}, encrypt */
270 {"force", 0, 0, 'f'}, /* force overwrite of output file */
271 {"help", 0, 0, 'h'}, /* give help */
272 /* {"pkzip", 0, 0, 'k'}, force output in pkzip format */
273 {"list", 0, 0, 'l'}, /* list .gz file contents */
274 {"license", 0, 0, 'L'}, /* display software license */
275 {"no-name", 0, 0, 'n'}, /* don't save or restore original name & time */
276 {"name", 0, 0, 'N'}, /* save or restore original name & time */
277 {"quiet", 0, 0, 'q'}, /* quiet mode */
278 {"silent", 0, 0, 'q'}, /* quiet mode */
279 {"recursive", 0, 0, 'r'}, /* recurse through directories */
280 {"suffix", 1, 0, 'S'}, /* use given suffix instead of .gz */
281 {"test", 0, 0, 't'}, /* test compressed file integrity */
282 {"no-time", 0, 0, 'T'}, /* don't save or restore the time stamp */
283 {"verbose", 0, 0, 'v'}, /* verbose mode */
284 {"version", 0, 0, 'V'}, /* display version number */
285 {"fast", 0, 0, '1'}, /* compress faster */
286 {"best", 0, 0, '9'}, /* compress better */
287 {"lzw", 0, 0, 'Z'}, /* make output compatible with old compress */
288 {"bits", 1, 0, 'b'}, /* max number of bits per code (implies -Z) */
289 {"rsyncable", 0, 0, 'R'}, /* make rsync-friendly archive */
293 /* local functions */
295 local void usage OF((void));
296 local void help OF((void));
297 local void license OF((void));
298 local void version OF((void));
299 local int input_eof OF((void));
300 local void treat_stdin OF((void));
301 local void treat_file OF((char *iname));
302 local int create_outfile OF((void));
303 local int do_stat OF((char *name, struct stat *sbuf));
304 local char *get_suffix OF((char *name));
305 local int get_istat OF((char *iname, struct stat *sbuf));
306 local int make_ofname OF((void));
307 local int same_file OF((struct stat *stat1, struct stat *stat2));
308 local int name_too_long OF((char *name, struct stat *statb));
309 local void shorten_name OF((char *name));
310 local int get_method OF((int in));
311 local void do_list OF((int ifd, int method));
312 local int check_ofname OF((void));
313 local void copy_stat OF((struct stat *ifstat));
314 local void do_exit OF((int exitcode));
315 int main OF((int argc, char **argv));
316 int (*work) OF((int infile, int outfile)) = zip; /* function to call */
319 local void treat_dir OF((char *dir));
322 local void reset_times OF((char *name, struct stat *statb));
325 #define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
327 /* ======================================================================== */
330 printf ("usage: %s [-%scdfhlLnN%stvV19] [-S suffix] [file ...]\n",
332 O_BINARY ? "a" : "", NO_DIR ? "" : "r");
335 /* ======================================================================== */
338 static char *help_msg[] = {
340 " -a --ascii ascii text; convert end-of-lines using local conventions",
342 " -c --stdout write on standard output, keep original files unchanged",
343 " -d --decompress decompress",
344 /* -e --encrypt encrypt */
345 " -f --force force overwrite of output file and compress links",
346 " -h --help give this help",
347 /* -k --pkzip force output in pkzip format */
348 " -l --list list compressed file contents",
349 " -L --license display software license",
351 " -m --no-time do not save or restore the original modification time",
352 " -M --time save or restore the original modification time",
354 " -n --no-name do not save or restore the original name and time stamp",
355 " -N --name save or restore the original name and time stamp",
356 " -q --quiet suppress all warnings",
358 " -r --recursive operate recursively on directories",
360 " -S .suf --suffix .suf use suffix .suf on compressed files",
361 " -t --test test compressed file integrity",
362 " -v --verbose verbose mode",
363 " -V --version display version number",
364 " -1 --fast compress faster",
365 " -9 --best compress better",
367 " -Z --lzw produce output compatible with old compress",
368 " -b --bits maxbits max number of bits per code (implies -Z)",
370 " --rsyncable Make rsync-friendly archive",
371 " file... files to (de)compress. If none given, use standard input.",
372 "Report bugs to <bug-gzip@gnu.org>.",
376 printf ("%s %s\n(%s)\n", progname, VERSION, REVDATE);
378 while (*p) printf ("%s\n", *p++);
381 /* ======================================================================== */
384 char **p = license_msg;
386 printf ("%s %s\n(%s)\n", progname, VERSION, REVDATE);
387 while (*p) printf ("%s\n", *p++);
390 /* ======================================================================== */
394 printf ("Compilation options:\n%s %s ", DIR_OPT, TIME_OPT);
396 printf ("STDC_HEADERS ");
399 printf ("HAVE_UNISTD_H ");
402 printf ("HAVE_MEMORY_H ");
405 printf ("HAVE_STRING_H ");
408 printf ("HAVE_LSTAT ");
410 #ifdef NO_MULTIPLE_DOTS
411 printf ("NO_MULTIPLE_DOTS ");
414 printf ("HAVE_CHOWN ");
426 printf ("DYN_ALLOC ");
429 printf ("MAXSEG_64K");
432 printf ("Written by Jean-loup Gailly.\n");
435 local void progerror (string)
439 fprintf(stderr, "%s: ", progname);
445 /* ======================================================================== */
446 int main (argc, argv)
450 int file_count; /* number of files to precess */
451 int proglen; /* length of progname */
452 int optc; /* current option */
454 EXPAND(argc, argv); /* wild card expansion if necessary */
456 progname = base_name (argv[0]);
457 proglen = strlen(progname);
459 /* Suppress .exe for MSDOS, OS/2 and VMS: */
460 if (proglen > 4 && strequ(progname+proglen-4, ".exe")) {
461 progname[proglen-4] = '\0';
464 /* Add options in GZIP environment variable if there is one */
465 env = add_envopt(&argc, &argv, OPTIONS_VAR);
466 if (env != NULL) args = argv;
468 foreground = signal(SIGINT, SIG_IGN) != SIG_IGN;
470 (void) signal (SIGINT, (sig_type)abort_gzip_signal);
473 if (signal(SIGTERM, SIG_IGN) != SIG_IGN) {
474 (void) signal(SIGTERM, (sig_type)abort_gzip_signal);
478 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) {
479 (void) signal(SIGHUP, (sig_type)abort_gzip_signal);
484 /* For compatibility with old compress, use program name as an option.
485 * If you compile with -DGNU_STANDARD, this program will behave as
486 * gzip even if it is invoked under the name gunzip or zcat.
488 * Systems which do not support links can still use -d or -dc.
489 * Ignore an .exe extension for MSDOS, OS/2 and VMS.
491 if ( strncmp(progname, "un", 2) == 0 /* ungzip, uncompress */
492 || strncmp(progname, "gun", 3) == 0) { /* gunzip */
494 } else if (strequ(progname+1, "cat") /* zcat, pcat, gcat */
495 || strequ(progname, "gzcat")) { /* gzcat */
496 decompress = to_stdout = 1;
501 z_len = strlen(z_suffix);
503 while ((optc = getopt_long (argc, argv, "ab:cdfhH?lLmMnNqrS:tvVZ123456789",
504 longopts, (int *)0)) != -1) {
509 maxbits = atoi(optarg);
510 for (; *optarg; optarg++)
511 if (! ('0' <= *optarg && *optarg <= '9'))
513 fprintf (stderr, "%s: -b operand is not an integer\n",
520 to_stdout = 1; break;
522 decompress = 1; break;
525 case 'h': case 'H': case '?':
526 help(); do_exit(OK); break;
528 list = decompress = to_stdout = 1; break;
530 license(); do_exit(OK); break;
531 case 'm': /* undocumented, may change later */
533 case 'M': /* undocumented, may change later */
536 no_name = no_time = 1; break;
538 no_name = no_time = 0; break;
540 quiet = 1; verbose = 0; break;
543 fprintf(stderr, "%s: -r not supported on this system\n", progname);
545 do_exit(ERROR); break;
547 recursive = 1; break;
553 #ifdef NO_MULTIPLE_DOTS
554 if (*optarg == '.') optarg++;
556 z_len = strlen(optarg);
560 test = decompress = to_stdout = 1;
563 verbose++; quiet = 0; break;
565 version(); do_exit(OK); break;
570 fprintf(stderr, "%s: -Z not supported in this version\n",
573 do_exit(ERROR); break;
575 case '1': case '2': case '3': case '4':
576 case '5': case '6': case '7': case '8': case '9':
580 /* Error message already emitted by getopt_long. */
584 } /* loop on all arguments */
587 /* Ignore "Broken Pipe" message with --quiet */
588 if (quiet && signal (SIGPIPE, SIG_IGN) != SIG_IGN)
589 signal (SIGPIPE, (sig_type) abort_gzip_signal);
592 /* By default, save name and timestamp on compression but do not
593 * restore them on decompression.
595 if (no_time < 0) no_time = decompress;
596 if (no_name < 0) no_name = decompress;
598 file_count = argc - optind;
602 if (ascii && !quiet) {
603 fprintf(stderr, "%s: option --ascii ignored on this system\n",
607 if ((z_len == 0 && !decompress) || z_len > MAX_SUFFIX) {
608 fprintf(stderr, "%s: incorrect suffix '%s'\n",
612 if (do_lzw && !decompress) work = lzw;
614 /* Allocate all global buffers (for DYN_ALLOC option) */
615 ALLOC(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
616 ALLOC(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
617 ALLOC(ush, d_buf, DIST_BUFSIZE);
618 ALLOC(uch, window, 2L*WSIZE);
620 ALLOC(ush, tab_prefix, 1L<<BITS);
622 ALLOC(ush, tab_prefix0, 1L<<(BITS-1));
623 ALLOC(ush, tab_prefix1, 1L<<(BITS-1));
626 /* And get to work */
627 if (file_count != 0) {
628 if (to_stdout && !test && !list && (!decompress || !ascii)) {
629 SET_BINARY_MODE(fileno(stdout));
631 while (optind < argc) {
632 treat_file(argv[optind++]);
634 } else { /* Standard input */
637 if (list && !quiet && file_count > 1) {
638 do_list(-1, -1); /* print totals */
641 return exit_code; /* just to avoid lint warning */
644 /* Return nonzero when at end of file on input. */
648 if (!decompress || last_member)
653 if (insize != INBUFSIZ || fill_inbuf (1) == EOF)
656 /* Unget the char that fill_inbuf got. */
663 /* ========================================================================
664 * Compress or decompress stdin
666 local void treat_stdin()
668 if (!force && !list &&
669 isatty(fileno((FILE *)(decompress ? stdin : stdout)))) {
670 /* Do not send compressed data to the terminal or read it from
671 * the terminal. We get here when user invoked the program
672 * without parameters, so be helpful. According to the GNU standards:
674 * If there is one behavior you think is most useful when the output
675 * is to a terminal, and another that you think is most useful when
676 * the output is a file or a pipe, then it is usually best to make
677 * the default behavior the one that is useful with output to a
678 * terminal, and have an option for the other behavior.
680 * Here we use the --force option to get the other behavior.
683 "%s: compressed data not %s a terminal. Use -f to force %scompression.\n",
684 progname, decompress ? "read from" : "written to",
685 decompress ? "de" : "");
686 fprintf(stderr,"For help, type: %s -h\n", progname);
690 if (decompress || !ascii) {
691 SET_BINARY_MODE(fileno(stdin));
693 if (!test && !list && (!decompress || !ascii)) {
694 SET_BINARY_MODE(fileno(stdout));
696 strcpy(ifname, "stdin");
697 strcpy(ofname, "stdout");
699 /* Get the time stamp on the input file. */
700 time_stamp = 0; /* time unknown by default */
702 #ifndef NO_STDIN_FSTAT
703 if (list || !no_time) {
704 if (fstat(fileno(stdin), &istat) != 0) {
705 progerror("standard input");
708 # ifdef NO_PIPE_TIMESTAMP
709 if (S_ISREG(istat.st_mode))
711 time_stamp = istat.st_mtime;
712 #endif /* NO_STDIN_FSTAT */
714 ifile_size = -1L; /* convention for unknown size */
716 clear_bufs(); /* clear input and output buffers */
721 method = get_method(ifd);
723 do_exit(exit_code); /* error message already emitted */
727 do_list(ifd, method);
731 /* Actually do the compression/decompression. Loop over zipped members.
734 if ((*work)(fileno(stdin), fileno(stdout)) != OK) return;
739 method = get_method(ifd);
740 if (method < 0) return; /* error message already emitted */
741 bytes_out = 0; /* required for length check */
746 fprintf(stderr, " OK\n");
748 } else if (!decompress) {
749 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
750 fprintf(stderr, "\n");
751 #ifdef DISPLAY_STDIN_RATIO
753 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
754 fprintf(stderr, "\n");
760 /* ========================================================================
761 * Compress or decompress the given file
763 local void treat_file(iname)
766 /* Accept "-" as synonym for stdin */
767 if (strequ(iname, "-")) {
768 int cflag = to_stdout;
774 /* Check if the input file is present, set ifname and istat: */
775 if (get_istat(iname, &istat) != OK) return;
777 /* If the input name is that of a directory, recurse or ignore: */
778 if (S_ISDIR(istat.st_mode)) {
784 /* Warning: ifname is now garbage */
786 reset_times (iname, &st);
790 WARN((stderr,"%s: %s is a directory -- ignored\n", progname, ifname));
793 if (!S_ISREG(istat.st_mode)) {
795 "%s: %s is not a directory or a regular file - ignored\n",
799 if (istat.st_nlink > 1 && !to_stdout && !force) {
800 WARN((stderr, "%s: %s has %lu other link%c -- unchanged\n",
801 progname, ifname, (unsigned long) istat.st_nlink - 1,
802 istat.st_nlink > 2 ? 's' : ' '));
806 ifile_size = istat.st_size;
807 time_stamp = no_time && !list ? 0 : istat.st_mtime;
809 /* Generate output file name. For -r and (-t or -l), skip files
810 * without a valid gzip suffix (check done in make_ofname).
812 if (to_stdout && !list && !test) {
813 strcpy(ofname, "stdout");
815 } else if (make_ofname() != OK) {
819 /* Open the input file and determine compression method. The mode
820 * parameter is ignored but required by some systems (VMS) and forbidden
821 * on other systems (MacOS).
823 ifd = OPEN(ifname, ascii && !decompress ? O_RDONLY : O_RDONLY | O_BINARY,
829 clear_bufs(); /* clear input and output buffers */
833 method = get_method(ifd); /* updates ofname if original given */
836 return; /* error message already emitted */
840 do_list(ifd, method);
845 /* If compressing to a file, check if ofname is not ambiguous
846 * because the operating system truncates names. Otherwise, generate
847 * a new ofname and save the original name in the compressed file.
850 ofd = fileno(stdout);
851 /* keep remove_ofname as zero */
853 if (create_outfile() != OK) return;
855 if (!decompress && save_orig_name && !verbose && !quiet) {
856 fprintf(stderr, "%s: %s compressed to %s\n",
857 progname, ifname, ofname);
860 /* Keep the name even if not truncated except with --no-name: */
861 if (!save_orig_name) save_orig_name = !no_name;
864 fprintf(stderr, "%s:\t", ifname);
867 /* Actually do the compression/decompression. Loop over zipped members.
870 if ((*work)(ifd, ofd) != OK) {
871 method = -1; /* force cleanup */
878 method = get_method(ifd);
879 if (method < 0) break; /* error message already emitted */
880 bytes_out = 0; /* required for length check */
885 /* Copy modes, times, ownership, and remove the input file */
891 if (!to_stdout) xunlink (ofname);
894 /* Display statistics */
897 fprintf(stderr, " OK");
898 } else if (decompress) {
899 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
901 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
903 if (!test && !to_stdout) {
904 fprintf(stderr, " -- replaced with %s", ofname);
906 fprintf(stderr, "\n");
910 /* ========================================================================
911 * Create the output file. Return OK or ERROR.
912 * Try several times if necessary to avoid truncating the z_suffix. For
913 * example, do not create a compressed file of name "1234567890123."
914 * Sets save_orig_name to true if the file name has been truncated.
915 * IN assertions: the input file has already been open (ifd is set) and
916 * ofname has already been updated if there was an original name.
917 * OUT assertions: ifd and ofd are closed in case of error.
919 local int create_outfile()
921 struct stat ostat; /* stat for ofname */
922 int flags = O_WRONLY | O_CREAT | O_EXCL | O_BINARY;
924 if (ascii && decompress) {
925 flags &= ~O_BINARY; /* force ascii text mode */
928 /* Make sure that ofname is not an existing file */
929 if (check_ofname() != OK) {
933 /* Create the output file */
935 ofd = OPEN(ofname, flags, RW_USER);
942 /* Check for name truncation on new file (1234567890123.gz) */
944 if (stat(ofname, &ostat) != 0) {
946 if (fstat(ofd, &ostat) != 0) {
949 close(ifd); close(ofd);
953 if (!name_too_long(ofname, &ostat)) return OK;
956 /* name might be too long if an original name was saved */
957 WARN((stderr, "%s: %s: warning, name truncated\n",
963 #ifdef NO_MULTIPLE_DOTS
964 /* Should never happen, see check_ofname() */
965 fprintf(stderr, "%s: %s: name too long\n", progname, ofname);
968 shorten_name(ofname);
972 /* ========================================================================
973 * Use lstat if available, except for -c or -f. Use stat otherwise.
974 * This allows links when not removing the original file.
976 local int do_stat(name, sbuf)
981 if (!to_stdout && !force) {
982 return lstat(name, sbuf);
984 return stat(name, sbuf);
987 /* ========================================================================
988 * Return a pointer to the 'z' suffix of a file name, or NULL. For all
989 * systems, ".gz", ".z", ".Z", ".taz", ".tgz", "-gz", "-z" and "_z" are
990 * accepted suffixes, in addition to the value of the --suffix option.
991 * ".tgz" is a useful convention for tar.z files on systems limited
992 * to 3 characters extensions. On such systems, ".?z" and ".??z" are
993 * also accepted suffixes. For Unix, we do not want to accept any
994 * .??z suffix as indicating a compressed file; some people use .xyz
995 * to denote volume data.
996 * On systems allowing multiple versions of the same file (such as VMS),
997 * this function removes any version suffix in the given name.
999 local char *get_suffix(name)
1003 char suffix[MAX_SUFFIX+3]; /* last chars of name, forced to lower case */
1004 static char *known_suffixes[] =
1005 {NULL, ".gz", ".z", ".taz", ".tgz", "-gz", "-z", "_z",
1006 #ifdef MAX_EXT_CHARS
1010 char **suf = known_suffixes;
1013 if (strequ(z_suffix, "z")) suf++; /* check long suffixes first */
1016 /* strip a version number from the file name */
1018 char *v = strrchr(name, SUFFIX_SEP);
1019 if (v != NULL) *v = '\0';
1022 nlen = strlen(name);
1023 if (nlen <= MAX_SUFFIX+2) {
1024 strcpy(suffix, name);
1026 strcpy(suffix, name+nlen-MAX_SUFFIX-2);
1029 slen = strlen(suffix);
1031 int s = strlen(*suf);
1032 if (slen > s && suffix[slen-s-1] != PATH_SEP
1033 && strequ(suffix + slen - s, *suf)) {
1036 } while (*++suf != NULL);
1042 /* ========================================================================
1043 * Set ifname to the input file name (with a suffix appended if necessary)
1044 * and istat to its stats. For decompression, if no file exists with the
1045 * original name, try adding successively z_suffix, .gz, .z, -z and .Z.
1046 * For MSDOS, we try only z_suffix and z.
1047 * Return OK or ERROR.
1049 local int get_istat(iname, sbuf)
1053 int ilen; /* strlen(ifname) */
1054 int z_suffix_errno = 0;
1055 static char *suffixes[] = {NULL, ".gz", ".z", "-z", ".Z", NULL};
1056 char **suf = suffixes;
1058 #ifdef NO_MULTIPLE_DOTS
1059 char *dot; /* pointer to ifname extension, or NULL */
1064 if (sizeof ifname - 1 <= strlen (iname))
1067 strcpy(ifname, iname);
1069 /* If input file exists, return OK. */
1070 if (do_stat(ifname, sbuf) == 0) return OK;
1072 if (!decompress || errno != ENOENT) {
1076 /* file.ext doesn't exist, try adding a suffix (after removing any
1077 * version number for VMS).
1079 s = get_suffix(ifname);
1081 progerror(ifname); /* ifname already has z suffix and does not exist */
1084 #ifdef NO_MULTIPLE_DOTS
1085 dot = strrchr(ifname, '.');
1087 strcat(ifname, ".");
1088 dot = strrchr(ifname, '.');
1091 ilen = strlen(ifname);
1092 if (strequ(z_suffix, ".gz")) suf++;
1094 /* Search for all suffixes */
1096 char *s0 = s = *suf;
1097 strcpy (ifname, iname);
1098 #ifdef NO_MULTIPLE_DOTS
1100 if (*dot == '\0') strcpy (dot, ".");
1102 #ifdef MAX_EXT_CHARS
1103 if (MAX_EXT_CHARS < strlen (s) + strlen (dot + 1))
1104 dot[MAX_EXT_CHARS + 1 - strlen (s)] = '\0';
1106 if (sizeof ifname <= ilen + strlen (s))
1109 if (do_stat(ifname, sbuf) == 0) return OK;
1110 if (strequ (s0, z_suffix))
1111 z_suffix_errno = errno;
1112 } while (*++suf != NULL);
1114 /* No suffix found, complain using z_suffix: */
1115 strcpy(ifname, iname);
1116 #ifdef NO_MULTIPLE_DOTS
1117 if (*dot == '\0') strcpy(dot, ".");
1119 #ifdef MAX_EXT_CHARS
1120 if (MAX_EXT_CHARS < z_len + strlen (dot + 1))
1121 dot[MAX_EXT_CHARS + 1 - z_len] = '\0';
1123 strcat(ifname, z_suffix);
1124 errno = z_suffix_errno;
1129 fprintf (stderr, "%s: %s: file name too long\n", progname, iname);
1134 /* ========================================================================
1135 * Generate ofname given ifname. Return OK, or WARNING if file must be skipped.
1136 * Sets save_orig_name to true if the file name has been truncated.
1138 local int make_ofname()
1140 char *suff; /* ofname z suffix */
1142 strcpy(ofname, ifname);
1143 /* strip a version number if any and get the gzip suffix if present: */
1144 suff = get_suffix(ofname);
1148 /* With -t or -l, try all files (even without .gz suffix)
1149 * except with -r (behave as with just -dr).
1151 if (!recursive && (list || test)) return OK;
1153 /* Avoid annoying messages with -r */
1154 if (verbose || (!recursive && !quiet)) {
1155 WARN((stderr,"%s: %s: unknown suffix -- ignored\n",
1160 /* Make a special case for .tgz and .taz: */
1162 if (strequ(suff, ".tgz") || strequ(suff, ".taz")) {
1163 strcpy(suff, ".tar");
1165 *suff = '\0'; /* strip the z suffix */
1167 /* ofname might be changed later if infile contains an original name */
1169 } else if (suff != NULL) {
1170 /* Avoid annoying messages with -r (see treat_dir()) */
1171 if (verbose || (!recursive && !quiet)) {
1172 WARN((stderr, "%s: %s already has %s suffix -- unchanged\n",
1173 progname, ifname, suff));
1179 #ifdef NO_MULTIPLE_DOTS
1180 suff = strrchr(ofname, '.');
1182 if (sizeof ofname <= strlen (ofname) + 1)
1184 strcat(ofname, ".");
1185 # ifdef MAX_EXT_CHARS
1186 if (strequ(z_suffix, "z")) {
1187 if (sizeof ofname <= strlen (ofname) + 2)
1189 strcat(ofname, "gz"); /* enough room */
1192 /* On the Atari and some versions of MSDOS, name_too_long()
1193 * does not work correctly because of a bug in stat(). So we
1194 * must truncate here.
1196 } else if (strlen(suff)-1 + z_len > MAX_SUFFIX) {
1197 suff[MAX_SUFFIX+1-z_len] = '\0';
1201 #endif /* NO_MULTIPLE_DOTS */
1202 if (sizeof ofname <= strlen (ofname) + z_len)
1204 strcat(ofname, z_suffix);
1206 } /* decompress ? */
1210 WARN ((stderr, "%s: %s: file name too long\n", progname, ifname));
1215 /* ========================================================================
1216 * Check the magic number of the input file and update ofname if an
1217 * original name was given and to_stdout is not set.
1218 * Return the compression method, -1 for error, -2 for warning.
1219 * Set inptr to the offset of the next byte to be processed.
1220 * Updates time_stamp if there is one and --no-time is not used.
1221 * This function may be called repeatedly for an input file consisting
1222 * of several contiguous gzip'ed members.
1223 * IN assertions: there is at least one remaining compressed member.
1224 * If the member is a zip file, it must be the only one.
1226 local int get_method(in)
1227 int in; /* input file descriptor */
1229 uch flags; /* compression flags */
1230 char magic[2]; /* magic header */
1231 int imagic1; /* like magic[1], but can represent EOF */
1232 ulg stamp; /* time stamp */
1234 /* If --force and --stdout, zcat == cat, so do not complain about
1235 * premature end of file: use try_byte instead of get_byte.
1237 if (force && to_stdout) {
1238 magic[0] = (char)try_byte();
1239 imagic1 = try_byte ();
1240 magic[1] = (char) imagic1;
1241 /* If try_byte returned EOF, magic[1] == (char) EOF. */
1243 magic[0] = (char)get_byte();
1244 magic[1] = (char)get_byte();
1245 imagic1 = 0; /* avoid lint warning */
1247 method = -1; /* unknown yet */
1248 part_nb++; /* number of parts in gzip file */
1250 last_member = RECORD_IO;
1251 /* assume multiple members in gzip file except for record oriented I/O */
1253 if (memcmp(magic, GZIP_MAGIC, 2) == 0
1254 || memcmp(magic, OLD_GZIP_MAGIC, 2) == 0) {
1256 method = (int)get_byte();
1257 if (method != DEFLATED) {
1259 "%s: %s: unknown method %d -- not supported\n",
1260 progname, ifname, method);
1265 flags = (uch)get_byte();
1267 if ((flags & ENCRYPTED) != 0) {
1269 "%s: %s is encrypted -- not supported\n",
1274 if ((flags & CONTINUATION) != 0) {
1276 "%s: %s is a a multi-part gzip file -- not supported\n",
1279 if (force <= 1) return -1;
1281 if ((flags & RESERVED) != 0) {
1283 "%s: %s has flags 0x%x -- not supported\n",
1284 progname, ifname, flags);
1286 if (force <= 1) return -1;
1288 stamp = (ulg)get_byte();
1289 stamp |= ((ulg)get_byte()) << 8;
1290 stamp |= ((ulg)get_byte()) << 16;
1291 stamp |= ((ulg)get_byte()) << 24;
1292 if (stamp != 0 && !no_time) time_stamp = stamp;
1294 (void)get_byte(); /* Ignore extra flags for the moment */
1295 (void)get_byte(); /* Ignore OS type for the moment */
1297 if ((flags & CONTINUATION) != 0) {
1298 unsigned part = (unsigned)get_byte();
1299 part |= ((unsigned)get_byte())<<8;
1301 fprintf(stderr,"%s: %s: part number %u\n",
1302 progname, ifname, part);
1305 if ((flags & EXTRA_FIELD) != 0) {
1306 unsigned len = (unsigned)get_byte();
1307 len |= ((unsigned)get_byte())<<8;
1309 fprintf(stderr,"%s: %s: extra field of %u bytes ignored\n",
1310 progname, ifname, len);
1312 while (len--) (void)get_byte();
1315 /* Get original file name if it was truncated */
1316 if ((flags & ORIG_NAME) != 0) {
1317 if (no_name || (to_stdout && !list) || part_nb > 1) {
1318 /* Discard the old name */
1319 char c; /* dummy used for NeXTstep 3.0 cc optimizer bug */
1320 do {c=get_byte();} while (c != 0);
1322 /* Copy the base name. Keep a directory prefix intact. */
1323 char *p = base_name (ofname);
1327 *p = (char)get_char();
1328 if (*p++ == '\0') break;
1329 if (p >= ofname+sizeof(ofname)) {
1330 error("corrupted input -- file name too large");
1333 base2 = base_name (base);
1334 strcpy(base, base2);
1335 /* If necessary, adapt the name to local OS conventions: */
1337 MAKE_LEGAL_NAME(base);
1338 if (base) list=0; /* avoid warning about unused variable */
1340 } /* no_name || to_stdout */
1343 /* Discard file comment if any */
1344 if ((flags & COMMENT) != 0) {
1345 while (get_char() != 0) /* null */ ;
1348 header_bytes = inptr + 2*sizeof(long); /* include crc and size */
1351 } else if (memcmp(magic, PKZIP_MAGIC, 2) == 0 && inptr == 2
1352 && memcmp((char*)inbuf, PKZIP_MAGIC, 4) == 0) {
1353 /* To simplify the code, we support a zip file when alone only.
1354 * We are thus guaranteed that the entire local header fits in inbuf.
1358 if (check_zipfile(in) != OK) return -1;
1359 /* check_zipfile may get ofname from the local header */
1362 } else if (memcmp(magic, PACK_MAGIC, 2) == 0) {
1366 } else if (memcmp(magic, LZW_MAGIC, 2) == 0) {
1368 method = COMPRESSED;
1371 } else if (memcmp(magic, LZH_MAGIC, 2) == 0) {
1376 } else if (force && to_stdout && !list) { /* pass input unchanged */
1382 if (method >= 0) return method;
1385 fprintf(stderr, "\n%s: %s: not in gzip format\n", progname, ifname);
1392 for (inbyte = imagic1; inbyte == 0; inbyte = try_byte ())
1397 WARN ((stderr, "\n%s: %s: decompression OK, trailing zero bytes ignored\n",
1403 WARN((stderr, "\n%s: %s: decompression OK, trailing garbage ignored\n",
1409 /* ========================================================================
1410 * Display the characteristics of the compressed file.
1411 * If the given method is < 0, display the accumulated totals.
1412 * IN assertions: time_stamp, header_bytes and ifile_size are initialized.
1414 local void do_list(ifd, method)
1415 int ifd; /* input file descriptor */
1416 int method; /* compression method */
1418 ulg crc; /* original crc */
1419 static int first_time = 1;
1420 static char* methods[MAX_METHODS] = {
1425 "", "", "", "", /* 4 to 7 reserved */
1428 int positive_off_t_width = 1;
1431 for (o = OFF_T_MAX; 9 < o; o /= 10) {
1432 positive_off_t_width++;
1435 if (first_time && method >= 0) {
1438 printf("method crc date time ");
1441 printf("%*.*s %*.*s ratio uncompressed_name\n",
1442 positive_off_t_width, positive_off_t_width, "compressed",
1443 positive_off_t_width, positive_off_t_width, "uncompressed");
1445 } else if (method < 0) {
1446 if (total_in <= 0 || total_out <= 0) return;
1450 if (verbose || !quiet) {
1451 fprint_off(stdout, total_in, positive_off_t_width);
1453 fprint_off(stdout, total_out, positive_off_t_width);
1456 display_ratio(total_out-(total_in-header_bytes), total_out, stdout);
1457 /* header_bytes is not meaningful but used to ensure the same
1458 * ratio if there is a single file.
1460 printf(" (totals)\n");
1463 crc = (ulg)~0; /* unknown */
1465 bytes_in = ifile_size;
1468 if (method == DEFLATED && !last_member) {
1469 /* Get the crc and uncompressed size for gzip'ed (not zip'ed) files.
1470 * If the lseek fails, we could use read() to get to the end, but
1471 * --list is used to get quick results.
1472 * Use "gunzip < foo.gz | wc -c" to get the uncompressed size if
1473 * you are not concerned about speed.
1475 bytes_in = lseek(ifd, (off_t)(-8), SEEK_END);
1476 if (bytes_in != -1L) {
1479 if (read(ifd, (char*)buf, sizeof(buf)) != sizeof(buf)) {
1483 bytes_out = LG(buf+4);
1486 #endif /* RECORD_IO */
1487 date = ctime((time_t*)&time_stamp) + 4; /* skip the day of the week */
1488 date[12] = '\0'; /* suppress the 1/100sec and the year */
1490 printf("%5s %08lx %11s ", methods[method], crc, date);
1492 fprint_off(stdout, bytes_in, positive_off_t_width);
1494 fprint_off(stdout, bytes_out, positive_off_t_width);
1496 if (bytes_in == -1L) {
1498 bytes_in = bytes_out = header_bytes = 0;
1499 } else if (total_in >= 0) {
1500 total_in += bytes_in;
1502 if (bytes_out == -1L) {
1504 bytes_in = bytes_out = header_bytes = 0;
1505 } else if (total_out >= 0) {
1506 total_out += bytes_out;
1508 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out, stdout);
1509 printf(" %s\n", ofname);
1512 /* ========================================================================
1513 * Return true if the two stat structures correspond to the same file.
1515 local int same_file(stat1, stat2)
1519 return stat1->st_ino == stat2->st_ino
1520 && stat1->st_dev == stat2->st_dev
1522 /* Can't rely on st_ino and st_dev, use other fields: */
1523 && stat1->st_mode == stat2->st_mode
1524 && stat1->st_uid == stat2->st_uid
1525 && stat1->st_gid == stat2->st_gid
1526 && stat1->st_size == stat2->st_size
1527 && stat1->st_atime == stat2->st_atime
1528 && stat1->st_mtime == stat2->st_mtime
1529 && stat1->st_ctime == stat2->st_ctime
1534 /* ========================================================================
1535 * Return true if a file name is ambiguous because the operating system
1536 * truncates file names.
1538 local int name_too_long(name, statb)
1539 char *name; /* file name to check */
1540 struct stat *statb; /* stat buf for this file name */
1542 int s = strlen(name);
1544 struct stat tstat; /* stat for truncated name */
1547 tstat = *statb; /* Just in case OS does not fill all fields */
1549 res = lstat(name, &tstat) == 0 && same_file(statb, &tstat);
1551 Trace((stderr, " too_long(%s) => %d\n", name, res));
1555 /* ========================================================================
1556 * Shorten the given name by one character, or replace a .tar extension
1557 * with .tgz. Truncate the last part of the name which is longer than
1558 * MIN_PART characters: 1234.678.012.gz -> 123.678.012.gz. If the name
1559 * has only parts shorter than MIN_PART truncate the longest part.
1560 * For decompression, just remove the last character of the name.
1562 * IN assertion: for compression, the suffix of the given name is z_suffix.
1564 local void shorten_name(name)
1567 int len; /* length of name without z_suffix */
1568 char *trunc = NULL; /* character to be truncated */
1569 int plen; /* current part length */
1570 int min_part = MIN_PART; /* current minimum part length */
1575 if (len <= 1) error("name too short");
1579 p = get_suffix(name);
1580 if (p == NULL) error("can't recover suffix\n");
1584 /* compress 1234567890.tar to 1234567890.tgz */
1585 if (len > 4 && strequ(p-4, ".tar")) {
1586 strcpy(p-4, ".tgz");
1589 /* Try keeping short extensions intact:
1590 * 1234.678.012.gz -> 123.678.012.gz
1593 p = strrchr(name, PATH_SEP);
1596 plen = strcspn(p, PART_SEP);
1598 if (plen > min_part) trunc = p-1;
1601 } while (trunc == NULL && --min_part != 0);
1603 if (trunc != NULL) {
1605 trunc[0] = trunc[1];
1609 trunc = strrchr(name, PART_SEP[0]);
1610 if (trunc == NULL) error("internal error in shorten_name");
1611 if (trunc[1] == '\0') trunc--; /* force truncation */
1613 strcpy(trunc, z_suffix);
1616 /* ========================================================================
1617 * If compressing to a file, check if ofname is not ambiguous
1618 * because the operating system truncates names. Otherwise, generate
1619 * a new ofname and save the original name in the compressed file.
1620 * If the compressed file already exists, ask for confirmation.
1621 * The check for name truncation is made dynamically, because different
1622 * file systems on the same OS might use different truncation rules (on SVR4
1623 * s5 truncates to 14 chars and ufs does not truncate).
1624 * This function returns -1 if the file must be skipped, and
1625 * updates save_orig_name if necessary.
1626 * IN assertions: save_orig_name is already set if ofname has been
1627 * already truncated because of NO_MULTIPLE_DOTS. The input file has
1628 * already been open and istat is set.
1630 local int check_ofname()
1632 struct stat ostat; /* stat for ofname */
1635 /* Check for strictly conforming Posix systems (which return ENAMETOOLONG
1636 * instead of silently truncating filenames).
1639 while (lstat(ofname, &ostat) != 0) {
1640 if (errno != ENAMETOOLONG) return 0; /* ofname does not exist */
1641 shorten_name(ofname);
1644 if (lstat(ofname, &ostat) != 0) return 0;
1646 /* Check for name truncation on existing file. Do this even on systems
1647 * defining ENAMETOOLONG, because on most systems the strict Posix
1648 * behavior is disabled by default (silent name truncation allowed).
1650 if (!decompress && name_too_long(ofname, &ostat)) {
1651 shorten_name(ofname);
1652 if (lstat(ofname, &ostat) != 0) return 0;
1655 /* Check that the input and output files are different (could be
1656 * the same by name truncation or links).
1658 if (same_file(&istat, &ostat)) {
1659 if (strequ(ifname, ofname)) {
1660 fprintf(stderr, "%s: %s: cannot %scompress onto itself\n",
1661 progname, ifname, decompress ? "de" : "");
1663 fprintf(stderr, "%s: %s and %s are the same file\n",
1664 progname, ifname, ofname);
1669 /* Ask permission to overwrite the existing file */
1672 fprintf(stderr, "%s: %s already exists;", progname, ofname);
1673 if (foreground && 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)) {
1693 /* ========================================================================
1694 * Set the access and modification times from the given stat buffer.
1696 local void reset_times (name, statb)
1700 struct utimbuf timep;
1702 /* Copy the time stamp */
1703 timep.actime = statb->st_atime;
1704 timep.modtime = statb->st_mtime;
1706 /* Some systems (at least OS/2) do not support utime on directories */
1707 if (utime(name, &timep) && !S_ISDIR(statb->st_mode)) {
1709 WARN((stderr, "%s: ", progname));
1719 /* ========================================================================
1720 * Copy modes, times, ownership from input file to output file.
1721 * IN assertion: to_stdout is false.
1723 local void copy_stat(ifstat)
1724 struct stat *ifstat;
1727 if (decompress && time_stamp != 0 && ifstat->st_mtime != time_stamp) {
1728 ifstat->st_mtime = time_stamp;
1730 fprintf(stderr, "%s: time stamp restored\n", ofname);
1733 reset_times(ofname, ifstat);
1735 /* Copy the protection modes */
1736 if (fchmod(ofd, ifstat->st_mode & 07777)) {
1738 WARN((stderr, "%s: ", progname));
1745 fchown(ofd, ifstat->st_uid, ifstat->st_gid); /* Copy ownership */
1748 /* It's now safe to remove the input file: */
1749 if (xunlink (ifname)) {
1751 WARN((stderr, "%s: ", progname));
1761 /* ========================================================================
1762 * Recurse through the given directory. This code is taken from ncompress.
1764 local void treat_dir(dir)
1769 char nbuf[MAX_PATH_LEN];
1772 dirp = opendir(dir);
1779 ** WARNING: the following algorithm could occasionally cause
1780 ** compress to produce error warnings of the form "<filename>.gz
1781 ** already has .gz suffix - ignored". This occurs when the
1782 ** .gz output file is inserted into the directory below
1783 ** readdir's current pointer.
1784 ** These warnings are harmless but annoying, so they are suppressed
1785 ** with option -r (except when -v is on). An alternative
1786 ** to allowing this would be to store the entire directory
1787 ** list in memory, then compress the entries in the stored
1788 ** list. Given the depth-first recursive algorithm used here,
1789 ** this could use up a tremendous amount of memory. I don't
1790 ** think it's worth it. -- Dave Mack
1791 ** (An other alternative might be two passes to avoid depth-first.)
1794 while ((errno = 0, dp = readdir(dirp)) != NULL) {
1796 if (strequ(dp->d_name,".") || strequ(dp->d_name,"..")) {
1800 if (len + NAMLEN(dp) + 1 < MAX_PATH_LEN - 1) {
1802 if (len != 0 /* dir = "" means current dir on Amiga */
1804 && dir[len-1] != PATH_SEP2
1807 && dir[len-1] != PATH_SEP3
1810 nbuf[len++] = PATH_SEP;
1812 strcpy(nbuf+len, dp->d_name);
1815 fprintf(stderr,"%s: %s/%s: pathname too long\n",
1816 progname, dir, dp->d_name);
1822 if (CLOSEDIR(dirp) != 0)
1825 #endif /* ! NO_DIR */
1827 /* ========================================================================
1828 * Free all dynamically allocated variables and exit with the given code.
1830 local void do_exit(exitcode)
1833 static int in_exit = 0;
1835 if (in_exit) exit(exitcode);
1837 if (env != NULL) free(env), env = NULL;
1838 if (args != NULL) free((char*)args), args = NULL;
1852 /* ========================================================================
1853 * Close and unlink the output file if appropriate. This routine must be
1854 * async-signal-safe.
1856 local void do_remove() {
1857 if (remove_ofname) {
1863 /* ========================================================================
1866 RETSIGTYPE abort_gzip()
1872 /* ========================================================================
1875 RETSIGTYPE abort_gzip_signal()