source: vendor/gzip/1.3.11/gzip.c@ 3408

Last change on this file since 3408 was 3325, checked in by bird, 18 years ago

gzip 1.3.11
File size: 51.8 KB
Line 
1/* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
2
3 Copyright (C) 1999, 2001, 2002, 2006, 2007 Free Software Foundation, Inc.
4 Copyright (C) 1992-1993 Jean-loup Gailly
5
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)
9 any later version.
10
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.
15
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. */
19
20/*
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.
25 *
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.
28 */
29
30static char *license_msg[] = {
31"Copyright (C) 2007 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.",
360};
37
38/* Compress files with zip algorithm and 'compress' interface.
39 * See help() function below for all options.
40 * Outputs:
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.
46 *
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.
52 *
53 * For the meaning of all compilation flags, see comments in Makefile.in.
54 */
55
56#ifdef RCSID
57static char rcsid[] = "$Id: gzip.c,v 1.14 2007/02/05 20:54:26 eggert Exp $";
58#endif
59
60#include <config.h>
61#include <ctype.h>
62#include <sys/types.h>
63#include <signal.h>
64#include <sys/stat.h>
65#include <errno.h>
66
67#include "tailor.h"
68#include "gzip.h"
69#include "lzw.h"
70#include "revision.h"
71
72#include "fcntl-safer.h"
73#include "getopt.h"
74#include "stat-time.h"
75#include "timespec.h"
76
77 /* configuration */
78
79#ifdef HAVE_TIME_H
80# include <time.h>
81#else
82# include <sys/time.h>
83#endif
84
85#ifdef HAVE_FCNTL_H
86# include <fcntl.h>
87#endif
88
89#ifdef HAVE_LIMITS_H
90# include <limits.h>
91#endif
92
93#ifdef HAVE_UNISTD_H
94# include <unistd.h>
95#endif
96
97#if defined STDC_HEADERS || defined HAVE_STDLIB_H
98# include <stdlib.h>
99#else
100 extern int errno;
101#endif
102
103#ifndef NO_DIR
104# define NO_DIR 0
105#endif
106#if !NO_DIR
107# include <dirent.h>
108# ifndef _D_EXACT_NAMLEN
109# define _D_EXACT_NAMLEN(dp) strlen ((dp)->d_name)
110# endif
111#endif
112
113#ifdef CLOSEDIR_VOID
114# define CLOSEDIR(d) (closedir(d), 0)
115#else
116# define CLOSEDIR(d) closedir(d)
117#endif
118
119#ifndef NO_UTIME
120# include <utimens.h>
121#endif
122
123#define RW_USER (S_IRUSR | S_IWUSR) /* creation mode for open() */
124
125#ifndef MAX_PATH_LEN
126# define MAX_PATH_LEN 1024 /* max pathname length */
127#endif
128
129#ifndef SEEK_END
130# define SEEK_END 2
131#endif
132
133#ifndef CHAR_BIT
134# define CHAR_BIT 8
135#endif
136
137#ifdef off_t
138 off_t lseek OF((int fd, off_t offset, int whence));
139#endif
140
141#ifndef OFF_T_MIN
142#define OFF_T_MIN (~ (off_t) 0 << (sizeof (off_t) * CHAR_BIT - 1))
143#endif
144
145#ifndef OFF_T_MAX
146#define OFF_T_MAX (~ (off_t) 0 - OFF_T_MIN)
147#endif
148
149/* Use SA_NOCLDSTOP as a proxy for whether the sigaction machinery is
150 present. */
151#ifndef SA_NOCLDSTOP
152# define SA_NOCLDSTOP 0
153# define sigprocmask(how, set, oset) /* empty */
154# define sigset_t int
155# if ! HAVE_SIGINTERRUPT
156# define siginterrupt(sig, flag) /* empty */
157# endif
158#endif
159
160#ifndef HAVE_WORKING_O_NOFOLLOW
161# define HAVE_WORKING_O_NOFOLLOW 0
162#endif
163
164#ifndef ELOOP
165# define ELOOP EINVAL
166#endif
167
168/* Separator for file name parts (see shorten_name()) */
169#ifdef NO_MULTIPLE_DOTS
170# define PART_SEP "-"
171#else
172# define PART_SEP "."
173#endif
174
175 /* global buffers */
176
177DECLARE(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
178DECLARE(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
179DECLARE(ush, d_buf, DIST_BUFSIZE);
180DECLARE(uch, window, 2L*WSIZE);
181#ifndef MAXSEG_64K
182 DECLARE(ush, tab_prefix, 1L<<BITS);
183#else
184 DECLARE(ush, tab_prefix0, 1L<<(BITS-1));
185 DECLARE(ush, tab_prefix1, 1L<<(BITS-1));
186#endif
187
188 /* local variables */
189
190int ascii = 0; /* convert end-of-lines to local OS conventions */
191int to_stdout = 0; /* output to stdout (-c) */
192int decompress = 0; /* decompress (-d) */
193int force = 0; /* don't ask questions, compress links (-f) */
194int no_name = -1; /* don't save or restore the original file name */
195int no_time = -1; /* don't save or restore the original file time */
196int recursive = 0; /* recurse through directories (-r) */
197int list = 0; /* list the file contents (-l) */
198int verbose = 0; /* be verbose (-v) */
199int quiet = 0; /* be very quiet (-q) */
200int do_lzw = 0; /* generate output compatible with old compress (-Z) */
201int test = 0; /* test .gz file integrity */
202int foreground; /* set if program run in foreground */
203char *program_name; /* program name */
204int maxbits = BITS; /* max bits per code for LZW */
205int method = DEFLATED;/* compression method */
206int level = 6; /* compression level */
207int exit_code = OK; /* program exit code */
208int save_orig_name; /* set if original name must be saved */
209int last_member; /* set for .zip and .Z files */
210int part_nb; /* number of parts in .gz file */
211struct timespec time_stamp; /* original time stamp (modification time) */
212off_t ifile_size; /* input file size, -1 for devices (debug only) */
213char *env; /* contents of GZIP env variable */
214char **args = NULL; /* argv pointer if GZIP env variable defined */
215char *z_suffix; /* default suffix (can be set with --suffix) */
216size_t z_len; /* strlen(z_suffix) */
217
218/* The set of signals that are caught. */
219static sigset_t caught_signals;
220
221/* If nonzero then exit with status WARNING, rather than with the usual
222 signal status, on receipt of a signal with this value. This
223 suppresses a "Broken Pipe" message with some shells. */
224static int volatile exiting_signal;
225
226/* If nonnegative, close this file descriptor and unlink ofname on error. */
227static int volatile remove_ofname_fd = -1;
228
229off_t bytes_in; /* number of input bytes */
230off_t bytes_out; /* number of output bytes */
231off_t total_in; /* input bytes for all files */
232off_t total_out; /* output bytes for all files */
233char ifname[MAX_PATH_LEN]; /* input file name */
234char ofname[MAX_PATH_LEN]; /* output file name */
235struct stat istat; /* status for input file */
236int ifd; /* input file descriptor */
237int ofd; /* output file descriptor */
238unsigned insize; /* valid bytes in inbuf */
239unsigned inptr; /* index of next byte to be processed in inbuf */
240unsigned outcnt; /* bytes in output buffer */
241
242struct option longopts[] =
243{
244 /* { name has_arg *flag val } */
245 {"ascii", 0, 0, 'a'}, /* ascii text mode */
246 {"to-stdout", 0, 0, 'c'}, /* write output on standard output */
247 {"stdout", 0, 0, 'c'}, /* write output on standard output */
248 {"decompress", 0, 0, 'd'}, /* decompress */
249 {"uncompress", 0, 0, 'd'}, /* decompress */
250 /* {"encrypt", 0, 0, 'e'}, encrypt */
251 {"force", 0, 0, 'f'}, /* force overwrite of output file */
252 {"help", 0, 0, 'h'}, /* give help */
253 /* {"pkzip", 0, 0, 'k'}, force output in pkzip format */
254 {"list", 0, 0, 'l'}, /* list .gz file contents */
255 {"license", 0, 0, 'L'}, /* display software license */
256 {"no-name", 0, 0, 'n'}, /* don't save or restore original name & time */
257 {"name", 0, 0, 'N'}, /* save or restore original name & time */
258 {"quiet", 0, 0, 'q'}, /* quiet mode */
259 {"silent", 0, 0, 'q'}, /* quiet mode */
260 {"recursive", 0, 0, 'r'}, /* recurse through directories */
261 {"suffix", 1, 0, 'S'}, /* use given suffix instead of .gz */
262 {"test", 0, 0, 't'}, /* test compressed file integrity */
263 {"no-time", 0, 0, 'T'}, /* don't save or restore the time stamp */
264 {"verbose", 0, 0, 'v'}, /* verbose mode */
265 {"version", 0, 0, 'V'}, /* display version number */
266 {"fast", 0, 0, '1'}, /* compress faster */
267 {"best", 0, 0, '9'}, /* compress better */
268 {"lzw", 0, 0, 'Z'}, /* make output compatible with old compress */
269 {"bits", 1, 0, 'b'}, /* max number of bits per code (implies -Z) */
270 { 0, 0, 0, 0 }
271};
272
273/* local functions */
274
275local void try_help OF((void)) ATTRIBUTE_NORETURN;
276local void help OF((void));
277local void license OF((void));
278local void version OF((void));
279local int input_eof OF((void));
280local void treat_stdin OF((void));
281local void treat_file OF((char *iname));
282local int create_outfile OF((void));
283local char *get_suffix OF((char *name));
284local int open_input_file OF((char *iname, struct stat *sbuf));
285local int make_ofname OF((void));
286local void shorten_name OF((char *name));
287local int get_method OF((int in));
288local void do_list OF((int ifd, int method));
289local int check_ofname OF((void));
290local void copy_stat OF((struct stat *ifstat));
291local void install_signal_handlers OF((void));
292local void remove_output_file OF((void));
293local RETSIGTYPE abort_gzip_signal OF((int));
294local void do_exit OF((int exitcode)) ATTRIBUTE_NORETURN;
295 int main OF((int argc, char **argv));
296int (*work) OF((int infile, int outfile)) = zip; /* function to call */
297
298#if ! NO_DIR
299local void treat_dir OF((int fd, char *dir));
300#endif
301
302#define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
303
304static void
305try_help ()
306{
307 fprintf (stderr, "Try `%s --help' for more information.\n",
308 program_name);
309 do_exit (ERROR);
310}
311
312/* ======================================================================== */
313local void help()
314{
315 static char *help_msg[] = {
316 "Compress or uncompress FILEs (by default, compress FILES in-place).",
317 "",
318 "Mandatory arguments to long options are mandatory for short options too.",
319 "",
320#if O_BINARY
321 " -a, --ascii ascii text; convert end-of-line using local conventions",
322#endif
323 " -c, --stdout write on standard output, keep original files unchanged",
324 " -d, --decompress decompress",
325/* -e, --encrypt encrypt */
326 " -f, --force force overwrite of output file and compress links",
327 " -h, --help give this help",
328/* -k, --pkzip force output in pkzip format */
329 " -l, --list list compressed file contents",
330 " -L, --license display software license",
331#ifdef UNDOCUMENTED
332 " -m, --no-time do not save or restore the original modification time",
333 " -M, --time save or restore the original modification time",
334#endif
335 " -n, --no-name do not save or restore the original name and time stamp",
336 " -N, --name save or restore the original name and time stamp",
337 " -q, --quiet suppress all warnings",
338#if ! NO_DIR
339 " -r, --recursive operate recursively on directories",
340#endif
341 " -S, --suffix=SUF use suffix SUF on compressed files",
342 " -t, --test test compressed file integrity",
343 " -v, --verbose verbose mode",
344 " -V, --version display version number",
345 " -1, --fast compress faster",
346 " -9, --best compress better",
347#ifdef LZW
348 " -Z, --lzw produce output compatible with old compress",
349 " -b, --bits=BITS max number of bits per code (implies -Z)",
350#endif
351 "",
352 "With no FILE, or when FILE is -, read standard input.",
353 "",
354 "Report bugs to <bug-gzip@gnu.org>.",
355 0};
356 char **p = help_msg;
357
358 printf ("Usage: %s [OPTION]... [FILE]...\n", program_name);
359 while (*p) printf ("%s\n", *p++);
360}
361
362/* ======================================================================== */
363local void license()
364{
365 char **p = license_msg;
366
367 printf ("%s %s\n", program_name, VERSION);
368 while (*p) printf ("%s\n", *p++);
369}
370
371/* ======================================================================== */
372local void version()
373{
374 license ();
375 printf ("\n");
376 printf ("Written by Jean-loup Gailly.\n");
377}
378
379local void progerror (string)
380 char *string;
381{
382 int e = errno;
383 fprintf (stderr, "%s: ", program_name);
384 errno = e;
385 perror(string);
386 exit_code = ERROR;
387}
388
389/* ======================================================================== */
390int main (argc, argv)
391 int argc;
392 char **argv;
393{
394 int file_count; /* number of files to process */
395 size_t proglen; /* length of program_name */
396 int optc; /* current option */
397
398 EXPAND(argc, argv); /* wild card expansion if necessary */
399
400 program_name = gzip_base_name (argv[0]);
401 proglen = strlen (program_name);
402
403 /* Suppress .exe for MSDOS, OS/2 and VMS: */
404 if (4 < proglen && strequ (program_name + proglen - 4, ".exe"))
405 program_name[proglen - 4] = '\0';
406
407 /* Add options in GZIP environment variable if there is one */
408 env = add_envopt(&argc, &argv, OPTIONS_VAR);
409 if (env != NULL) args = argv;
410
411#ifndef GNU_STANDARD
412# define GNU_STANDARD 1
413#endif
414#if !GNU_STANDARD
415 /* For compatibility with old compress, use program name as an option.
416 * Unless you compile with -DGNU_STANDARD=0, this program will behave as
417 * gzip even if it is invoked under the name gunzip or zcat.
418 *
419 * Systems which do not support links can still use -d or -dc.
420 * Ignore an .exe extension for MSDOS, OS/2 and VMS.
421 */
422 if (strncmp (program_name, "un", 2) == 0 /* ungzip, uncompress */
423 || strncmp (program_name, "gun", 3) == 0) /* gunzip */
424 decompress = 1;
425 else if (strequ (program_name + 1, "cat") /* zcat, pcat, gcat */
426 || strequ (program_name, "gzcat")) /* gzcat */
427 decompress = to_stdout = 1;
428#endif
429
430 z_suffix = Z_SUFFIX;
431 z_len = strlen(z_suffix);
432
433 while ((optc = getopt_long (argc, argv, "ab:cdfhH?lLmMnNqrS:tvVZ123456789",
434 longopts, (int *)0)) != -1) {
435 switch (optc) {
436 case 'a':
437 ascii = 1; break;
438 case 'b':
439 maxbits = atoi(optarg);
440 for (; *optarg; optarg++)
441 if (! ('0' <= *optarg && *optarg <= '9'))
442 {
443 fprintf (stderr, "%s: -b operand is not an integer\n",
444 program_name);
445 try_help ();
446 }
447 break;
448 case 'c':
449 to_stdout = 1; break;
450 case 'd':
451 decompress = 1; break;
452 case 'f':
453 force++; break;
454 case 'h': case 'H':
455 help(); do_exit(OK); break;
456 case 'l':
457 list = decompress = to_stdout = 1; break;
458 case 'L':
459 license(); do_exit(OK); break;
460 case 'm': /* undocumented, may change later */
461 no_time = 1; break;
462 case 'M': /* undocumented, may change later */
463 no_time = 0; break;
464 case 'n':
465 no_name = no_time = 1; break;
466 case 'N':
467 no_name = no_time = 0; break;
468 case 'q':
469 quiet = 1; verbose = 0; break;
470 case 'r':
471#if NO_DIR
472 fprintf (stderr, "%s: -r not supported on this system\n",
473 program_name);
474 try_help ();
475#else
476 recursive = 1;
477#endif
478 break;
479 case 'S':
480#ifdef NO_MULTIPLE_DOTS
481 if (*optarg == '.') optarg++;
482#endif
483 z_len = strlen(optarg);
484 z_suffix = optarg;
485 break;
486 case 't':
487 test = decompress = to_stdout = 1;
488 break;
489 case 'v':
490 verbose++; quiet = 0; break;
491 case 'V':
492 version(); do_exit(OK); break;
493 case 'Z':
494#ifdef LZW
495 do_lzw = 1; break;
496#else
497 fprintf(stderr, "%s: -Z not supported in this version\n",
498 program_name);
499 try_help ();
500 break;
501#endif
502 case '1': case '2': case '3': case '4':
503 case '5': case '6': case '7': case '8': case '9':
504 level = optc - '0';
505 break;
506 default:
507 /* Error message already emitted by getopt_long. */
508 try_help ();
509 }
510 } /* loop on all arguments */
511
512 /* By default, save name and timestamp on compression but do not
513 * restore them on decompression.
514 */
515 if (no_time < 0) no_time = decompress;
516 if (no_name < 0) no_name = decompress;
517
518 file_count = argc - optind;
519
520#if O_BINARY
521#else
522 if (ascii && !quiet) {
523 fprintf(stderr, "%s: option --ascii ignored on this system\n",
524 program_name);
525 }
526#endif
527 if ((z_len == 0 && !decompress) || z_len > MAX_SUFFIX) {
528 fprintf(stderr, "%s: incorrect suffix '%s'\n",
529 program_name, z_suffix);
530 do_exit(ERROR);
531 }
532 if (do_lzw && !decompress) work = lzw;
533
534 /* Allocate all global buffers (for DYN_ALLOC option) */
535 ALLOC(uch, inbuf, INBUFSIZ +INBUF_EXTRA);
536 ALLOC(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
537 ALLOC(ush, d_buf, DIST_BUFSIZE);
538 ALLOC(uch, window, 2L*WSIZE);
539#ifndef MAXSEG_64K
540 ALLOC(ush, tab_prefix, 1L<<BITS);
541#else
542 ALLOC(ush, tab_prefix0, 1L<<(BITS-1));
543 ALLOC(ush, tab_prefix1, 1L<<(BITS-1));
544#endif
545
546 exiting_signal = quiet ? SIGPIPE : 0;
547 install_signal_handlers ();
548
549 /* And get to work */
550 if (file_count != 0) {
551 if (to_stdout && !test && !list && (!decompress || !ascii)) {
552 SET_BINARY_MODE(fileno(stdout));
553 }
554 while (optind < argc) {
555 treat_file(argv[optind++]);
556 }
557 } else { /* Standard input */
558 treat_stdin();
559 }
560 if (list && !quiet && file_count > 1) {
561 do_list(-1, -1); /* print totals */
562 }
563 do_exit(exit_code);
564 return exit_code; /* just to avoid lint warning */
565}
566
567/* Return nonzero when at end of file on input. */
568local int
569input_eof ()
570{
571 if (!decompress || last_member)
572 return 1;
573
574 if (inptr == insize)
575 {
576 if (insize != INBUFSIZ || fill_inbuf (1) == EOF)
577 return 1;
578
579 /* Unget the char that fill_inbuf got. */
580 inptr = 0;
581 }
582
583 return 0;
584}
585
586/* ========================================================================
587 * Compress or decompress stdin
588 */
589local void treat_stdin()
590{
591 if (!force && !list &&
592 isatty(fileno((FILE *)(decompress ? stdin : stdout)))) {
593 /* Do not send compressed data to the terminal or read it from
594 * the terminal. We get here when user invoked the program
595 * without parameters, so be helpful. According to the GNU standards:
596 *
597 * If there is one behavior you think is most useful when the output
598 * is to a terminal, and another that you think is most useful when
599 * the output is a file or a pipe, then it is usually best to make
600 * the default behavior the one that is useful with output to a
601 * terminal, and have an option for the other behavior.
602 *
603 * Here we use the --force option to get the other behavior.
604 */
605 fprintf(stderr,
606 "%s: compressed data not %s a terminal. Use -f to force %scompression.\n",
607 program_name, decompress ? "read from" : "written to",
608 decompress ? "de" : "");
609 fprintf (stderr, "For help, type: %s -h\n", program_name);
610 do_exit(ERROR);
611 }
612
613 if (decompress || !ascii) {
614 SET_BINARY_MODE(fileno(stdin));
615 }
616 if (!test && !list && (!decompress || !ascii)) {
617 SET_BINARY_MODE(fileno(stdout));
618 }
619 strcpy(ifname, "stdin");
620 strcpy(ofname, "stdout");
621
622 /* Get the file's time stamp and size. */
623 if (fstat (fileno (stdin), &istat) != 0)
624 {
625 progerror ("standard input");
626 do_exit (ERROR);
627 }
628 ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1;
629 time_stamp.tv_nsec = -1;
630 if (!no_time || list)
631 time_stamp = get_stat_mtime (&istat);
632
633 clear_bufs(); /* clear input and output buffers */
634 to_stdout = 1;
635 part_nb = 0;
636
637 if (decompress) {
638 method = get_method(ifd);
639 if (method < 0) {
640 do_exit(exit_code); /* error message already emitted */
641 }
642 }
643 if (list) {
644 do_list(ifd, method);
645 return;
646 }
647
648 /* Actually do the compression/decompression. Loop over zipped members.
649 */
650 for (;;) {
651 if ((*work)(fileno(stdin), fileno(stdout)) != OK) return;
652
653 if (input_eof ())
654 break;
655
656 method = get_method(ifd);
657 if (method < 0) return; /* error message already emitted */
658 bytes_out = 0; /* required for length check */
659 }
660
661 if (verbose) {
662 if (test) {
663 fprintf(stderr, " OK\n");
664
665 } else if (!decompress) {
666 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
667 fprintf(stderr, "\n");
668#ifdef DISPLAY_STDIN_RATIO
669 } else {
670 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
671 fprintf(stderr, "\n");
672#endif
673 }
674 }
675}
676
677/* ========================================================================
678 * Compress or decompress the given file
679 */
680local void treat_file(iname)
681 char *iname;
682{
683 /* Accept "-" as synonym for stdin */
684 if (strequ(iname, "-")) {
685 int cflag = to_stdout;
686 treat_stdin();
687 to_stdout = cflag;
688 return;
689 }
690
691 /* Check if the input file is present, set ifname and istat: */
692 ifd = open_input_file (iname, &istat);
693 if (ifd < 0)
694 return;
695
696 /* If the input name is that of a directory, recurse or ignore: */
697 if (S_ISDIR(istat.st_mode)) {
698#if ! NO_DIR
699 if (recursive) {
700 treat_dir (ifd, iname);
701 /* Warning: ifname is now garbage */
702 return;
703 }
704#endif
705 close (ifd);
706 WARN ((stderr, "%s: %s is a directory -- ignored\n",
707 program_name, ifname));
708 return;
709 }
710
711 if (! to_stdout)
712 {
713 if (! S_ISREG (istat.st_mode))
714 {
715 WARN ((stderr,
716 "%s: %s is not a directory or a regular file - ignored\n",
717 program_name, ifname));
718 close (ifd);
719 return;
720 }
721 if (istat.st_mode & S_ISUID)
722 {
723 WARN ((stderr, "%s: %s is set-user-ID on execution - ignored\n",
724 program_name, ifname));
725 close (ifd);
726 return;
727 }
728 if (istat.st_mode & S_ISGID)
729 {
730 WARN ((stderr, "%s: %s is set-group-ID on execution - ignored\n",
731 program_name, ifname));
732 close (ifd);
733 return;
734 }
735
736 if (! force)
737 {
738 if (istat.st_mode & S_ISVTX)
739 {
740 WARN ((stderr,
741 "%s: %s has the sticky bit set - file ignored\n",
742 program_name, ifname));
743 close (ifd);
744 return;
745 }
746 if (2 <= istat.st_nlink)
747 {
748 WARN ((stderr, "%s: %s has %lu other link%c -- unchanged\n",
749 program_name, ifname,
750 (unsigned long int) istat.st_nlink - 1,
751 istat.st_nlink == 2 ? ' ' : 's'));
752 close (ifd);
753 return;
754 }
755 }
756 }
757
758 ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1;
759 time_stamp.tv_nsec = -1;
760 if (!no_time || list)
761 time_stamp = get_stat_mtime (&istat);
762
763 /* Generate output file name. For -r and (-t or -l), skip files
764 * without a valid gzip suffix (check done in make_ofname).
765 */
766 if (to_stdout && !list && !test) {
767 strcpy(ofname, "stdout");
768
769 } else if (make_ofname() != OK) {
770 close (ifd);
771 return;
772 }
773
774 clear_bufs(); /* clear input and output buffers */
775 part_nb = 0;
776
777 if (decompress) {
778 method = get_method(ifd); /* updates ofname if original given */
779 if (method < 0) {
780 close(ifd);
781 return; /* error message already emitted */
782 }
783 }
784 if (list) {
785 do_list(ifd, method);
786 if (close (ifd) != 0)
787 read_error ();
788 return;
789 }
790
791 /* If compressing to a file, check if ofname is not ambiguous
792 * because the operating system truncates names. Otherwise, generate
793 * a new ofname and save the original name in the compressed file.
794 */
795 if (to_stdout) {
796 ofd = fileno(stdout);
797 /* Keep remove_ofname_fd negative. */
798 } else {
799 if (create_outfile() != OK) return;
800
801 if (!decompress && save_orig_name && !verbose && !quiet) {
802 fprintf(stderr, "%s: %s compressed to %s\n",
803 program_name, ifname, ofname);
804 }
805 }
806 /* Keep the name even if not truncated except with --no-name: */
807 if (!save_orig_name) save_orig_name = !no_name;
808
809 if (verbose) {
810 fprintf(stderr, "%s:\t", ifname);
811 }
812
813 /* Actually do the compression/decompression. Loop over zipped members.
814 */
815 for (;;) {
816 if ((*work)(ifd, ofd) != OK) {
817 method = -1; /* force cleanup */
818 break;
819 }
820
821 if (input_eof ())
822 break;
823
824 method = get_method(ifd);
825 if (method < 0) break; /* error message already emitted */
826 bytes_out = 0; /* required for length check */
827 }
828
829 if (close (ifd) != 0)
830 read_error ();
831
832 if (!to_stdout)
833 {
834 sigset_t oldset;
835 int unlink_errno;
836
837 copy_stat (&istat);
838 if (close (ofd) != 0)
839 write_error ();
840
841 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
842 remove_ofname_fd = -1;
843 unlink_errno = xunlink (ifname) == 0 ? 0 : errno;
844 sigprocmask (SIG_SETMASK, &oldset, NULL);
845
846 if (unlink_errno)
847 {
848 WARN ((stderr, "%s: ", program_name));
849 if (!quiet)
850 {
851 errno = unlink_errno;
852 perror (ifname);
853 }
854 }
855 }
856
857 if (method == -1) {
858 if (!to_stdout)
859 remove_output_file ();
860 return;
861 }
862
863 /* Display statistics */
864 if(verbose) {
865 if (test) {
866 fprintf(stderr, " OK");
867 } else if (decompress) {
868 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
869 } else {
870 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
871 }
872 if (!test && !to_stdout) {
873 fprintf(stderr, " -- replaced with %s", ofname);
874 }
875 fprintf(stderr, "\n");
876 }
877}
878
879/* ========================================================================
880 * Create the output file. Return OK or ERROR.
881 * Try several times if necessary to avoid truncating the z_suffix. For
882 * example, do not create a compressed file of name "1234567890123."
883 * Sets save_orig_name to true if the file name has been truncated.
884 * IN assertions: the input file has already been open (ifd is set) and
885 * ofname has already been updated if there was an original name.
886 * OUT assertions: ifd and ofd are closed in case of error.
887 */
888local int create_outfile()
889{
890 int name_shortened = 0;
891 int flags = (O_WRONLY | O_CREAT | O_EXCL
892 | (ascii && decompress ? 0 : O_BINARY));
893
894 for (;;)
895 {
896 int open_errno;
897 sigset_t oldset;
898
899 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
900 remove_ofname_fd = ofd = OPEN (ofname, flags, RW_USER);
901 open_errno = errno;
902 sigprocmask (SIG_SETMASK, &oldset, NULL);
903
904 if (0 <= ofd)
905 break;
906
907 switch (open_errno)
908 {
909#ifdef ENAMETOOLONG
910 case ENAMETOOLONG:
911 shorten_name (ofname);
912 name_shortened = 1;
913 break;
914#endif
915
916 case EEXIST:
917 if (check_ofname () != OK)
918 {
919 close (ifd);
920 return ERROR;
921 }
922 break;
923
924 default:
925 progerror (ofname);
926 close (ifd);
927 return ERROR;
928 }
929 }
930
931 if (name_shortened && decompress)
932 {
933 /* name might be too long if an original name was saved */
934 WARN ((stderr, "%s: %s: warning, name truncated\n",
935 program_name, ofname));
936 }
937
938 return OK;
939}
940
941/* ========================================================================
942 * Return a pointer to the 'z' suffix of a file name, or NULL. For all
943 * systems, ".gz", ".z", ".Z", ".taz", ".tgz", "-gz", "-z" and "_z" are
944 * accepted suffixes, in addition to the value of the --suffix option.
945 * ".tgz" is a useful convention for tar.z files on systems limited
946 * to 3 characters extensions. On such systems, ".?z" and ".??z" are
947 * also accepted suffixes. For Unix, we do not want to accept any
948 * .??z suffix as indicating a compressed file; some people use .xyz
949 * to denote volume data.
950 * On systems allowing multiple versions of the same file (such as VMS),
951 * this function removes any version suffix in the given name.
952 */
953local char *get_suffix(name)
954 char *name;
955{
956 int nlen, slen;
957 char suffix[MAX_SUFFIX+3]; /* last chars of name, forced to lower case */
958 static char *known_suffixes[] =
959 {NULL, ".gz", ".z", ".taz", ".tgz", "-gz", "-z", "_z",
960#ifdef MAX_EXT_CHARS
961 "z",
962#endif
963 NULL};
964 char **suf = known_suffixes;
965
966 *suf = z_suffix;
967 if (strequ(z_suffix, "z")) suf++; /* check long suffixes first */
968
969#ifdef SUFFIX_SEP
970 /* strip a version number from the file name */
971 {
972 char *v = strrchr(name, SUFFIX_SEP);
973 if (v != NULL) *v = '\0';
974 }
975#endif
976 nlen = strlen(name);
977 if (nlen <= MAX_SUFFIX+2) {
978 strcpy(suffix, name);
979 } else {
980 strcpy(suffix, name+nlen-MAX_SUFFIX-2);
981 }
982 strlwr(suffix);
983 slen = strlen(suffix);
984 do {
985 int s = strlen(*suf);
986 if (slen > s && suffix[slen-s-1] != PATH_SEP
987 && strequ(suffix + slen - s, *suf)) {
988 return name+nlen-s;
989 }
990 } while (*++suf != NULL);
991
992 return NULL;
993}
994
995
996/* Open file NAME with the given flags and mode and store its status
997 into *ST. Return a file descriptor to the newly opened file, or -1
998 (setting errno) on failure. */
999static int
1000open_and_stat (char *name, int flags, mode_t mode, struct stat *st)
1001{
1002 int fd;
1003
1004 /* Refuse to follow symbolic links unless -c or -f. */
1005 if (!to_stdout && !force)
1006 {
1007 if (HAVE_WORKING_O_NOFOLLOW)
1008 flags |= O_NOFOLLOW;
1009 else
1010 {
1011#if HAVE_LSTAT || defined lstat
1012 if (lstat (name, st) != 0)
1013 return -1;
1014 else if (S_ISLNK (st->st_mode))
1015 {
1016 errno = ELOOP;
1017 return -1;
1018 }
1019#endif
1020 }
1021 }
1022
1023 fd = OPEN (name, flags, mode);
1024 if (0 <= fd && fstat (fd, st) != 0)
1025 {
1026 int e = errno;
1027 close (fd);
1028 errno = e;
1029 return -1;
1030 }
1031 return fd;
1032}
1033
1034
1035/* ========================================================================
1036 * Set ifname to the input file name (with a suffix appended if necessary)
1037 * and istat to its stats. For decompression, if no file exists with the
1038 * original name, try adding successively z_suffix, .gz, .z, -z and .Z.
1039 * For MSDOS, we try only z_suffix and z.
1040 * Return an open file descriptor or -1.
1041 */
1042static int
1043open_input_file (iname, sbuf)
1044 char *iname;
1045 struct stat *sbuf;
1046{
1047 int ilen; /* strlen(ifname) */
1048 int z_suffix_errno = 0;
1049 static char *suffixes[] = {NULL, ".gz", ".z", "-z", ".Z", NULL};
1050 char **suf = suffixes;
1051 char *s;
1052#ifdef NO_MULTIPLE_DOTS
1053 char *dot; /* pointer to ifname extension, or NULL */
1054#endif
1055 int fd;
1056 int open_flags = (O_RDONLY | O_NONBLOCK | O_NOCTTY
1057 | (ascii && !decompress ? 0 : O_BINARY));
1058
1059 *suf = z_suffix;
1060
1061 if (sizeof ifname - 1 <= strlen (iname))
1062 goto name_too_long;
1063
1064 strcpy(ifname, iname);
1065
1066 /* If input file exists, return OK. */
1067 fd = open_and_stat (ifname, open_flags, RW_USER, sbuf);
1068 if (0 <= fd)
1069 return fd;
1070
1071 if (!decompress || errno != ENOENT) {
1072 progerror(ifname);
1073 return -1;
1074 }
1075 /* file.ext doesn't exist, try adding a suffix (after removing any
1076 * version number for VMS).
1077 */
1078 s = get_suffix(ifname);
1079 if (s != NULL) {
1080 progerror(ifname); /* ifname already has z suffix and does not exist */
1081 return -1;
1082 }
1083#ifdef NO_MULTIPLE_DOTS
1084 dot = strrchr(ifname, '.');
1085 if (dot == NULL) {
1086 strcat(ifname, ".");
1087 dot = strrchr(ifname, '.');
1088 }
1089#endif
1090 ilen = strlen(ifname);
1091 if (strequ(z_suffix, ".gz")) suf++;
1092
1093 /* Search for all suffixes */
1094 do {
1095 char *s0 = s = *suf;
1096 strcpy (ifname, iname);
1097#ifdef NO_MULTIPLE_DOTS
1098 if (*s == '.') s++;
1099 if (*dot == '\0') strcpy (dot, ".");
1100#endif
1101#ifdef MAX_EXT_CHARS
1102 if (MAX_EXT_CHARS < strlen (s) + strlen (dot + 1))
1103 dot[MAX_EXT_CHARS + 1 - strlen (s)] = '\0';
1104#endif
1105 if (sizeof ifname <= ilen + strlen (s))
1106 goto name_too_long;
1107 strcat(ifname, s);
1108 fd = open_and_stat (ifname, open_flags, RW_USER, sbuf);
1109 if (0 <= fd)
1110 return fd;
1111 if (errno != ENOENT)
1112 {
1113 progerror (ifname);
1114 return -1;
1115 }
1116 if (strequ (s0, z_suffix))
1117 z_suffix_errno = errno;
1118 } while (*++suf != NULL);
1119
1120 /* No suffix found, complain using z_suffix: */
1121 strcpy(ifname, iname);
1122#ifdef NO_MULTIPLE_DOTS
1123 if (*dot == '\0') strcpy(dot, ".");
1124#endif
1125#ifdef MAX_EXT_CHARS
1126 if (MAX_EXT_CHARS < z_len + strlen (dot + 1))
1127 dot[MAX_EXT_CHARS + 1 - z_len] = '\0';
1128#endif
1129 strcat(ifname, z_suffix);
1130 errno = z_suffix_errno;
1131 progerror(ifname);
1132 return -1;
1133
1134 name_too_long:
1135 fprintf (stderr, "%s: %s: file name too long\n", program_name, iname);
1136 exit_code = ERROR;
1137 return -1;
1138}
1139
1140/* ========================================================================
1141 * Generate ofname given ifname. Return OK, or WARNING if file must be skipped.
1142 * Sets save_orig_name to true if the file name has been truncated.
1143 */
1144local int make_ofname()
1145{
1146 char *suff; /* ofname z suffix */
1147
1148 strcpy(ofname, ifname);
1149 /* strip a version number if any and get the gzip suffix if present: */
1150 suff = get_suffix(ofname);
1151
1152 if (decompress) {
1153 if (suff == NULL) {
1154 /* With -t or -l, try all files (even without .gz suffix)
1155 * except with -r (behave as with just -dr).
1156 */
1157 if (!recursive && (list || test)) return OK;
1158
1159 /* Avoid annoying messages with -r */
1160 if (verbose || (!recursive && !quiet)) {
1161 WARN((stderr,"%s: %s: unknown suffix -- ignored\n",
1162 program_name, ifname));
1163 }
1164 return WARNING;
1165 }
1166 /* Make a special case for .tgz and .taz: */
1167 strlwr(suff);
1168 if (strequ(suff, ".tgz") || strequ(suff, ".taz")) {
1169 strcpy(suff, ".tar");
1170 } else {
1171 *suff = '\0'; /* strip the z suffix */
1172 }
1173 /* ofname might be changed later if infile contains an original name */
1174
1175 } else if (suff != NULL) {
1176 /* Avoid annoying messages with -r (see treat_dir()) */
1177 if (verbose || (!recursive && !quiet)) {
1178 /* Don't use WARN, as it affects exit status. */
1179 fprintf (stderr, "%s: %s already has %s suffix -- unchanged\n",
1180 program_name, ifname, suff);
1181 }
1182 return WARNING;
1183 } else {
1184 save_orig_name = 0;
1185
1186#ifdef NO_MULTIPLE_DOTS
1187 suff = strrchr(ofname, '.');
1188 if (suff == NULL) {
1189 if (sizeof ofname <= strlen (ofname) + 1)
1190 goto name_too_long;
1191 strcat(ofname, ".");
1192# ifdef MAX_EXT_CHARS
1193 if (strequ(z_suffix, "z")) {
1194 if (sizeof ofname <= strlen (ofname) + 2)
1195 goto name_too_long;
1196 strcat(ofname, "gz"); /* enough room */
1197 return OK;
1198 }
1199 /* On the Atari and some versions of MSDOS,
1200 * ENAMETOOLONG does not work correctly. So we
1201 * must truncate here.
1202 */
1203 } else if (strlen(suff)-1 + z_len > MAX_SUFFIX) {
1204 suff[MAX_SUFFIX+1-z_len] = '\0';
1205 save_orig_name = 1;
1206# endif
1207 }
1208#endif /* NO_MULTIPLE_DOTS */
1209 if (sizeof ofname <= strlen (ofname) + z_len)
1210 goto name_too_long;
1211 strcat(ofname, z_suffix);
1212
1213 } /* decompress ? */
1214 return OK;
1215
1216 name_too_long:
1217 WARN ((stderr, "%s: %s: file name too long\n", program_name, ifname));
1218 return WARNING;
1219}
1220
1221
1222/* ========================================================================
1223 * Check the magic number of the input file and update ofname if an
1224 * original name was given and to_stdout is not set.
1225 * Return the compression method, -1 for error, -2 for warning.
1226 * Set inptr to the offset of the next byte to be processed.
1227 * Updates time_stamp if there is one and --no-time is not used.
1228 * This function may be called repeatedly for an input file consisting
1229 * of several contiguous gzip'ed members.
1230 * IN assertions: there is at least one remaining compressed member.
1231 * If the member is a zip file, it must be the only one.
1232 */
1233local int get_method(in)
1234 int in; /* input file descriptor */
1235{
1236 uch flags; /* compression flags */
1237 char magic[2]; /* magic header */
1238 int imagic1; /* like magic[1], but can represent EOF */
1239 ulg stamp; /* time stamp */
1240
1241 /* If --force and --stdout, zcat == cat, so do not complain about
1242 * premature end of file: use try_byte instead of get_byte.
1243 */
1244 if (force && to_stdout) {
1245 magic[0] = (char)try_byte();
1246 imagic1 = try_byte ();
1247 magic[1] = (char) imagic1;
1248 /* If try_byte returned EOF, magic[1] == (char) EOF. */
1249 } else {
1250 magic[0] = (char)get_byte();
1251 magic[1] = (char)get_byte();
1252 imagic1 = 0; /* avoid lint warning */
1253 }
1254 method = -1; /* unknown yet */
1255 part_nb++; /* number of parts in gzip file */
1256 header_bytes = 0;
1257 last_member = RECORD_IO;
1258 /* assume multiple members in gzip file except for record oriented I/O */
1259
1260 if (memcmp(magic, GZIP_MAGIC, 2) == 0
1261 || memcmp(magic, OLD_GZIP_MAGIC, 2) == 0) {
1262
1263 method = (int)get_byte();
1264 if (method != DEFLATED) {
1265 fprintf(stderr,
1266 "%s: %s: unknown method %d -- not supported\n",
1267 program_name, ifname, method);
1268 exit_code = ERROR;
1269 return -1;
1270 }
1271 work = unzip;
1272 flags = (uch)get_byte();
1273
1274 if ((flags & ENCRYPTED) != 0) {
1275 fprintf(stderr,
1276 "%s: %s is encrypted -- not supported\n",
1277 program_name, ifname);
1278 exit_code = ERROR;
1279 return -1;
1280 }
1281 if ((flags & CONTINUATION) != 0) {
1282 fprintf(stderr,
1283 "%s: %s is a a multi-part gzip file -- not supported\n",
1284 program_name, ifname);
1285 exit_code = ERROR;
1286 if (force <= 1) return -1;
1287 }
1288 if ((flags & RESERVED) != 0) {
1289 fprintf(stderr,
1290 "%s: %s has flags 0x%x -- not supported\n",
1291 program_name, ifname, flags);
1292 exit_code = ERROR;
1293 if (force <= 1) return -1;
1294 }
1295 stamp = (ulg)get_byte();
1296 stamp |= ((ulg)get_byte()) << 8;
1297 stamp |= ((ulg)get_byte()) << 16;
1298 stamp |= ((ulg)get_byte()) << 24;
1299 if (stamp != 0 && !no_time)
1300 {
1301 time_stamp.tv_sec = stamp;
1302 time_stamp.tv_nsec = 0;
1303 }
1304
1305 (void)get_byte(); /* Ignore extra flags for the moment */
1306 (void)get_byte(); /* Ignore OS type for the moment */
1307
1308 if ((flags & CONTINUATION) != 0) {
1309 unsigned part = (unsigned)get_byte();
1310 part |= ((unsigned)get_byte())<<8;
1311 if (verbose) {
1312 fprintf(stderr,"%s: %s: part number %u\n",
1313 program_name, ifname, part);
1314 }
1315 }
1316 if ((flags & EXTRA_FIELD) != 0) {
1317 unsigned len = (unsigned)get_byte();
1318 len |= ((unsigned)get_byte())<<8;
1319 if (verbose) {
1320 fprintf(stderr,"%s: %s: extra field of %u bytes ignored\n",
1321 program_name, ifname, len);
1322 }
1323 while (len--) (void)get_byte();
1324 }
1325
1326 /* Get original file name if it was truncated */
1327 if ((flags & ORIG_NAME) != 0) {
1328 if (no_name || (to_stdout && !list) || part_nb > 1) {
1329 /* Discard the old name */
1330 char c; /* dummy used for NeXTstep 3.0 cc optimizer bug */
1331 do {c=get_byte();} while (c != 0);
1332 } else {
1333 /* Copy the base name. Keep a directory prefix intact. */
1334 char *p = gzip_base_name (ofname);
1335 char *base = p;
1336 for (;;) {
1337 *p = (char)get_char();
1338 if (*p++ == '\0') break;
1339 if (p >= ofname+sizeof(ofname)) {
1340 gzip_error ("corrupted input -- file name too large");
1341 }
1342 }
1343 p = gzip_base_name (base);
1344 memmove (base, p, strlen (p) + 1);
1345 /* If necessary, adapt the name to local OS conventions: */
1346 if (!list) {
1347 MAKE_LEGAL_NAME(base);
1348 if (base) list=0; /* avoid warning about unused variable */
1349 }
1350 } /* no_name || to_stdout */
1351 } /* ORIG_NAME */
1352
1353 /* Discard file comment if any */
1354 if ((flags & COMMENT) != 0) {
1355 while (get_char() != 0) /* null */ ;
1356 }
1357 if (part_nb == 1) {
1358 header_bytes = inptr + 2*sizeof(long); /* include crc and size */
1359 }
1360
1361 } else if (memcmp(magic, PKZIP_MAGIC, 2) == 0 && inptr == 2
1362 && memcmp((char*)inbuf, PKZIP_MAGIC, 4) == 0) {
1363 /* To simplify the code, we support a zip file when alone only.
1364 * We are thus guaranteed that the entire local header fits in inbuf.
1365 */
1366 inptr = 0;
1367 work = unzip;
1368 if (check_zipfile(in) != OK) return -1;
1369 /* check_zipfile may get ofname from the local header */
1370 last_member = 1;
1371
1372 } else if (memcmp(magic, PACK_MAGIC, 2) == 0) {
1373 work = unpack;
1374 method = PACKED;
1375
1376 } else if (memcmp(magic, LZW_MAGIC, 2) == 0) {
1377 work = unlzw;
1378 method = COMPRESSED;
1379 last_member = 1;
1380
1381 } else if (memcmp(magic, LZH_MAGIC, 2) == 0) {
1382 work = unlzh;
1383 method = LZHED;
1384 last_member = 1;
1385
1386 } else if (force && to_stdout && !list) { /* pass input unchanged */
1387 method = STORED;
1388 work = copy;
1389 inptr = 0;
1390 last_member = 1;
1391 }
1392 if (method >= 0) return method;
1393
1394 if (part_nb == 1) {
1395 fprintf (stderr, "\n%s: %s: not in gzip format\n",
1396 program_name, ifname);
1397 exit_code = ERROR;
1398 return -1;
1399 } else {
1400 if (magic[0] == 0)
1401 {
1402 int inbyte;
1403 for (inbyte = imagic1; inbyte == 0; inbyte = try_byte ())
1404 continue;
1405 if (inbyte == EOF)
1406 {
1407 if (verbose)
1408 WARN ((stderr, "\n%s: %s: decompression OK, trailing zero bytes ignored\n",
1409 program_name, ifname));
1410 return -3;
1411 }
1412 }
1413
1414 WARN((stderr, "\n%s: %s: decompression OK, trailing garbage ignored\n",
1415 program_name, ifname));
1416 return -2;
1417 }
1418}
1419
1420/* ========================================================================
1421 * Display the characteristics of the compressed file.
1422 * If the given method is < 0, display the accumulated totals.
1423 * IN assertions: time_stamp, header_bytes and ifile_size are initialized.
1424 */
1425local void do_list(ifd, method)
1426 int ifd; /* input file descriptor */
1427 int method; /* compression method */
1428{
1429 ulg crc; /* original crc */
1430 static int first_time = 1;
1431 static char* methods[MAX_METHODS] = {
1432 "store", /* 0 */
1433 "compr", /* 1 */
1434 "pack ", /* 2 */
1435 "lzh ", /* 3 */
1436 "", "", "", "", /* 4 to 7 reserved */
1437 "defla"}; /* 8 */
1438 int positive_off_t_width = 1;
1439 off_t o;
1440
1441 for (o = OFF_T_MAX; 9 < o; o /= 10) {
1442 positive_off_t_width++;
1443 }
1444
1445 if (first_time && method >= 0) {
1446 first_time = 0;
1447 if (verbose) {
1448 printf("method crc date time ");
1449 }
1450 if (!quiet) {
1451 printf("%*.*s %*.*s ratio uncompressed_name\n",
1452 positive_off_t_width, positive_off_t_width, "compressed",
1453 positive_off_t_width, positive_off_t_width, "uncompressed");
1454 }
1455 } else if (method < 0) {
1456 if (total_in <= 0 || total_out <= 0) return;
1457 if (verbose) {
1458 printf(" ");
1459 }
1460 if (verbose || !quiet) {
1461 fprint_off(stdout, total_in, positive_off_t_width);
1462 printf(" ");
1463 fprint_off(stdout, total_out, positive_off_t_width);
1464 printf(" ");
1465 }
1466 display_ratio(total_out-(total_in-header_bytes), total_out, stdout);
1467 /* header_bytes is not meaningful but used to ensure the same
1468 * ratio if there is a single file.
1469 */
1470 printf(" (totals)\n");
1471 return;
1472 }
1473 crc = (ulg)~0; /* unknown */
1474 bytes_out = -1L;
1475 bytes_in = ifile_size;
1476
1477#if RECORD_IO == 0
1478 if (method == DEFLATED && !last_member) {
1479 /* Get the crc and uncompressed size for gzip'ed (not zip'ed) files.
1480 * If the lseek fails, we could use read() to get to the end, but
1481 * --list is used to get quick results.
1482 * Use "gunzip < foo.gz | wc -c" to get the uncompressed size if
1483 * you are not concerned about speed.
1484 */
1485 bytes_in = lseek(ifd, (off_t)(-8), SEEK_END);
1486 if (bytes_in != -1L) {
1487 uch buf[8];
1488 bytes_in += 8L;
1489 if (read(ifd, (char*)buf, sizeof(buf)) != sizeof(buf)) {
1490 read_error();
1491 }
1492 crc = LG(buf);
1493 bytes_out = LG(buf+4);
1494 }
1495 }
1496#endif /* RECORD_IO */
1497 if (verbose)
1498 {
1499 struct tm *tm = localtime (&time_stamp.tv_sec);
1500 printf ("%5s %08lx ", methods[method], crc);
1501 if (tm)
1502 printf ("%s%3d %02d:%02d ",
1503 ("Jan\0Feb\0Mar\0Apr\0May\0Jun\0Jul\0Aug\0Sep\0Oct\0Nov\0Dec"
1504 + 4 * tm->tm_mon),
1505 tm->tm_mday, tm->tm_hour, tm->tm_min);
1506 else
1507 printf ("??? ?? ??:?? ");
1508 }
1509 fprint_off(stdout, bytes_in, positive_off_t_width);
1510 printf(" ");
1511 fprint_off(stdout, bytes_out, positive_off_t_width);
1512 printf(" ");
1513 if (bytes_in == -1L) {
1514 total_in = -1L;
1515 bytes_in = bytes_out = header_bytes = 0;
1516 } else if (total_in >= 0) {
1517 total_in += bytes_in;
1518 }
1519 if (bytes_out == -1L) {
1520 total_out = -1L;
1521 bytes_in = bytes_out = header_bytes = 0;
1522 } else if (total_out >= 0) {
1523 total_out += bytes_out;
1524 }
1525 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out, stdout);
1526 printf(" %s\n", ofname);
1527}
1528
1529/* ========================================================================
1530 * Shorten the given name by one character, or replace a .tar extension
1531 * with .tgz. Truncate the last part of the name which is longer than
1532 * MIN_PART characters: 1234.678.012.gz -> 123.678.012.gz. If the name
1533 * has only parts shorter than MIN_PART truncate the longest part.
1534 * For decompression, just remove the last character of the name.
1535 *
1536 * IN assertion: for compression, the suffix of the given name is z_suffix.
1537 */
1538local void shorten_name(name)
1539 char *name;
1540{
1541 int len; /* length of name without z_suffix */
1542 char *trunc = NULL; /* character to be truncated */
1543 int plen; /* current part length */
1544 int min_part = MIN_PART; /* current minimum part length */
1545 char *p;
1546
1547 len = strlen(name);
1548 if (decompress) {
1549 if (len <= 1)
1550 gzip_error ("name too short");
1551 name[len-1] = '\0';
1552 return;
1553 }
1554 p = get_suffix(name);
1555 if (! p)
1556 gzip_error ("can't recover suffix\n");
1557 *p = '\0';
1558 save_orig_name = 1;
1559
1560 /* compress 1234567890.tar to 1234567890.tgz */
1561 if (len > 4 && strequ(p-4, ".tar")) {
1562 strcpy(p-4, ".tgz");
1563 return;
1564 }
1565 /* Try keeping short extensions intact:
1566 * 1234.678.012.gz -> 123.678.012.gz
1567 */
1568 do {
1569 p = strrchr(name, PATH_SEP);
1570 p = p ? p+1 : name;
1571 while (*p) {
1572 plen = strcspn(p, PART_SEP);
1573 p += plen;
1574 if (plen > min_part) trunc = p-1;
1575 if (*p) p++;
1576 }
1577 } while (trunc == NULL && --min_part != 0);
1578
1579 if (trunc != NULL) {
1580 do {
1581 trunc[0] = trunc[1];
1582 } while (*trunc++);
1583 trunc--;
1584 } else {
1585 trunc = strrchr(name, PART_SEP[0]);
1586 if (!trunc)
1587 gzip_error ("internal error in shorten_name");
1588 if (trunc[1] == '\0') trunc--; /* force truncation */
1589 }
1590 strcpy(trunc, z_suffix);
1591}
1592
1593/* ========================================================================
1594 * The compressed file already exists, so ask for confirmation.
1595 * Return ERROR if the file must be skipped.
1596 */
1597local int check_ofname()
1598{
1599 /* Ask permission to overwrite the existing file */
1600 if (!force) {
1601 int ok = 0;
1602 fprintf (stderr, "%s: %s already exists;", program_name, ofname);
1603 if (foreground && isatty(fileno(stdin))) {
1604 fprintf(stderr, " do you wish to overwrite (y or n)? ");
1605 fflush(stderr);
1606 ok = yesno();
1607 }
1608 if (!ok) {
1609 fprintf(stderr, "\tnot overwritten\n");
1610 if (exit_code == OK) exit_code = WARNING;
1611 return ERROR;
1612 }
1613 }
1614 if (xunlink (ofname)) {
1615 progerror(ofname);
1616 return ERROR;
1617 }
1618 return OK;
1619}
1620
1621
1622/* ========================================================================
1623 * Copy modes, times, ownership from input file to output file.
1624 * IN assertion: to_stdout is false.
1625 */
1626local void copy_stat(ifstat)
1627 struct stat *ifstat;
1628{
1629 mode_t mode = ifstat->st_mode & S_IRWXUGO;
1630 int r;
1631
1632#ifndef NO_UTIME
1633 struct timespec timespec[2];
1634 timespec[0] = get_stat_atime (ifstat);
1635 timespec[1] = get_stat_mtime (ifstat);
1636
1637 if (decompress && 0 <= time_stamp.tv_nsec
1638 && ! (timespec[1].tv_sec == time_stamp.tv_sec
1639 && timespec[1].tv_nsec == time_stamp.tv_nsec))
1640 {
1641 timespec[1] = time_stamp;
1642 if (verbose > 1) {
1643 fprintf(stderr, "%s: time stamp restored\n", ofname);
1644 }
1645 }
1646
1647 if (futimens (ofd, ofname, timespec) != 0)
1648 {
1649 int e = errno;
1650 WARN ((stderr, "%s: ", program_name));
1651 if (!quiet)
1652 {
1653 errno = e;
1654 perror (ofname);
1655 }
1656 }
1657#endif
1658
1659#ifndef NO_CHOWN
1660# if HAVE_FCHOWN
1661 fchown (ofd, ifstat->st_uid, ifstat->st_gid); /* Copy ownership */
1662# elif HAVE_CHOWN
1663 chown(ofname, ifstat->st_uid, ifstat->st_gid); /* Copy ownership */
1664# endif
1665#endif
1666
1667 /* Copy the protection modes */
1668#if HAVE_FCHMOD
1669 r = fchmod (ofd, mode);
1670#else
1671 r = chmod (ofname, mode);
1672#endif
1673 if (r != 0) {
1674 int e = errno;
1675 WARN ((stderr, "%s: ", program_name));
1676 if (!quiet) {
1677 errno = e;
1678 perror(ofname);
1679 }
1680 }
1681}
1682
1683#if ! NO_DIR
1684
1685/* ========================================================================
1686 * Recurse through the given directory. This code is taken from ncompress.
1687 */
1688local void treat_dir (fd, dir)
1689 int fd;
1690 char *dir;
1691{
1692 struct dirent *dp;
1693 DIR *dirp;
1694 char nbuf[MAX_PATH_LEN];
1695 int len;
1696
1697#if HAVE_FDOPENDIR
1698 dirp = fdopendir (fd);
1699#else
1700 close (fd);
1701 dirp = opendir(dir);
1702#endif
1703
1704 if (dirp == NULL) {
1705 progerror(dir);
1706#if HAVE_FDOPENDIR
1707 close (fd);
1708#endif
1709 return ;
1710 }
1711 /*
1712 ** WARNING: the following algorithm could occasionally cause
1713 ** compress to produce error warnings of the form "<filename>.gz
1714 ** already has .gz suffix - ignored". This occurs when the
1715 ** .gz output file is inserted into the directory below
1716 ** readdir's current pointer.
1717 ** These warnings are harmless but annoying, so they are suppressed
1718 ** with option -r (except when -v is on). An alternative
1719 ** to allowing this would be to store the entire directory
1720 ** list in memory, then compress the entries in the stored
1721 ** list. Given the depth-first recursive algorithm used here,
1722 ** this could use up a tremendous amount of memory. I don't
1723 ** think it's worth it. -- Dave Mack
1724 ** (An other alternative might be two passes to avoid depth-first.)
1725 */
1726
1727 while ((errno = 0, dp = readdir(dirp)) != NULL) {
1728
1729 if (strequ(dp->d_name,".") || strequ(dp->d_name,"..")) {
1730 continue;
1731 }
1732 len = strlen(dir);
1733 if (len + _D_EXACT_NAMLEN (dp) + 1 < MAX_PATH_LEN - 1) {
1734 strcpy(nbuf,dir);
1735 if (len != 0 /* dir = "" means current dir on Amiga */
1736#ifdef PATH_SEP2
1737 && dir[len-1] != PATH_SEP2
1738#endif
1739#ifdef PATH_SEP3
1740 && dir[len-1] != PATH_SEP3
1741#endif
1742 ) {
1743 nbuf[len++] = PATH_SEP;
1744 }
1745 strcpy(nbuf+len, dp->d_name);
1746 treat_file(nbuf);
1747 } else {
1748 fprintf(stderr,"%s: %s/%s: pathname too long\n",
1749 program_name, dir, dp->d_name);
1750 exit_code = ERROR;
1751 }
1752 }
1753 if (errno != 0)
1754 progerror(dir);
1755 if (CLOSEDIR(dirp) != 0)
1756 progerror(dir);
1757}
1758#endif /* ! NO_DIR */
1759
1760/* Make sure signals get handled properly. */
1761
1762static void
1763install_signal_handlers ()
1764{
1765 static int sig[] =
1766 {
1767 /* SIGINT must be first, as 'foreground' depends on it. */
1768 SIGINT
1769
1770#ifdef SIGHUP
1771 , SIGHUP
1772#endif
1773#ifdef SIGPIPE
1774 , SIGPIPE
1775#else
1776# define SIGPIPE 0
1777#endif
1778#ifdef SIGTERM
1779 , SIGTERM
1780#endif
1781#ifdef SIGXCPU
1782 , SIGXCPU
1783#endif
1784#ifdef SIGXFSZ
1785 , SIGXFSZ
1786#endif
1787 };
1788 int nsigs = sizeof sig / sizeof sig[0];
1789 int i;
1790
1791#if SA_NOCLDSTOP
1792 struct sigaction act;
1793
1794 sigemptyset (&caught_signals);
1795 for (i = 0; i < nsigs; i++)
1796 {
1797 sigaction (sig[i], NULL, &act);
1798 if (act.sa_handler != SIG_IGN)
1799 sigaddset (&caught_signals, sig[i]);
1800 }
1801
1802 act.sa_handler = abort_gzip_signal;
1803 act.sa_mask = caught_signals;
1804 act.sa_flags = 0;
1805
1806 for (i = 0; i < nsigs; i++)
1807 if (sigismember (&caught_signals, sig[i]))
1808 {
1809 if (i == 0)
1810 foreground = 1;
1811 sigaction (sig[i], &act, NULL);
1812 }
1813#else
1814 for (i = 0; i < nsigs; i++)
1815 if (signal (sig[i], SIG_IGN) != SIG_IGN)
1816 {
1817 if (i == 0)
1818 foreground = 1;
1819 signal (sig[i], abort_gzip_signal);
1820 siginterrupt (sig[i], 1);
1821 }
1822#endif
1823}
1824
1825/* ========================================================================
1826 * Free all dynamically allocated variables and exit with the given code.
1827 */
1828local void do_exit(exitcode)
1829 int exitcode;
1830{
1831 static int in_exit = 0;
1832
1833 if (in_exit) exit(exitcode);
1834 in_exit = 1;
1835 if (env != NULL) free(env), env = NULL;
1836 if (args != NULL) free((char*)args), args = NULL;
1837 FREE(inbuf);
1838 FREE(outbuf);
1839 FREE(d_buf);
1840 FREE(window);
1841#ifndef MAXSEG_64K
1842 FREE(tab_prefix);
1843#else
1844 FREE(tab_prefix0);
1845 FREE(tab_prefix1);
1846#endif
1847 exit(exitcode);
1848}
1849
1850/* ========================================================================
1851 * Close and unlink the output file.
1852 */
1853static void
1854remove_output_file ()
1855{
1856 int fd;
1857 sigset_t oldset;
1858
1859 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
1860 fd = remove_ofname_fd;
1861 if (0 <= fd)
1862 {
1863 remove_ofname_fd = -1;
1864 close (fd);
1865 xunlink (ofname);
1866 }
1867 sigprocmask (SIG_SETMASK, &oldset, NULL);
1868}
1869
1870/* ========================================================================
1871 * Error handler.
1872 */
1873void
1874abort_gzip ()
1875{
1876 remove_output_file ();
1877 do_exit(ERROR);
1878}
1879
1880/* ========================================================================
1881 * Signal handler.
1882 */
1883static RETSIGTYPE
1884abort_gzip_signal (sig)
1885 int sig;
1886{
1887 if (! SA_NOCLDSTOP)
1888 signal (sig, SIG_IGN);
1889 remove_output_file ();
1890 if (sig == exiting_signal)
1891 _exit (WARNING);
1892 signal (sig, SIG_DFL);
1893 raise (sig);
1894}
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