source: trunk/essentials/app-arch/gzip/gzip.c@ 3402

Last change on this file since 3402 was 3362, checked in by bird, 18 years ago

drop the isatty check, it break gzip - >/dev/null stuff used in the tar testsuite.
File size: 52.0 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#ifndef __KLIBC__ /* isatty is a bit busted on OS/2 and will currently
592 * mistake /dev/null for TTYs. */
593 if (!force && !list &&
594 isatty(fileno((FILE *)(decompress ? stdin : stdout)))) {
595 /* Do not send compressed data to the terminal or read it from
596 * the terminal. We get here when user invoked the program
597 * without parameters, so be helpful. According to the GNU standards:
598 *
599 * If there is one behavior you think is most useful when the output
600 * is to a terminal, and another that you think is most useful when
601 * the output is a file or a pipe, then it is usually best to make
602 * the default behavior the one that is useful with output to a
603 * terminal, and have an option for the other behavior.
604 *
605 * Here we use the --force option to get the other behavior.
606 */
607 fprintf(stderr,
608 "%s: compressed data not %s a terminal. Use -f to force %scompression.\n",
609 program_name, decompress ? "read from" : "written to",
610 decompress ? "de" : "");
611 fprintf (stderr, "For help, type: %s -h\n", program_name);
612 do_exit(ERROR);
613 }
614#endif /* !__KLIBC__ */
615
616 if (decompress || !ascii) {
617 SET_BINARY_MODE(fileno(stdin));
618 }
619 if (!test && !list && (!decompress || !ascii)) {
620 SET_BINARY_MODE(fileno(stdout));
621 }
622 strcpy(ifname, "stdin");
623 strcpy(ofname, "stdout");
624
625 /* Get the file's time stamp and size. */
626 if (fstat (fileno (stdin), &istat) != 0)
627 {
628 progerror ("standard input");
629 do_exit (ERROR);
630 }
631 ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1;
632 time_stamp.tv_nsec = -1;
633 if (!no_time || list)
634 time_stamp = get_stat_mtime (&istat);
635
636 clear_bufs(); /* clear input and output buffers */
637 to_stdout = 1;
638 part_nb = 0;
639
640 if (decompress) {
641 method = get_method(ifd);
642 if (method < 0) {
643 do_exit(exit_code); /* error message already emitted */
644 }
645 }
646 if (list) {
647 do_list(ifd, method);
648 return;
649 }
650
651 /* Actually do the compression/decompression. Loop over zipped members.
652 */
653 for (;;) {
654 if ((*work)(fileno(stdin), fileno(stdout)) != OK) return;
655
656 if (input_eof ())
657 break;
658
659 method = get_method(ifd);
660 if (method < 0) return; /* error message already emitted */
661 bytes_out = 0; /* required for length check */
662 }
663
664 if (verbose) {
665 if (test) {
666 fprintf(stderr, " OK\n");
667
668 } else if (!decompress) {
669 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
670 fprintf(stderr, "\n");
671#ifdef DISPLAY_STDIN_RATIO
672 } else {
673 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
674 fprintf(stderr, "\n");
675#endif
676 }
677 }
678}
679
680/* ========================================================================
681 * Compress or decompress the given file
682 */
683local void treat_file(iname)
684 char *iname;
685{
686 /* Accept "-" as synonym for stdin */
687 if (strequ(iname, "-")) {
688 int cflag = to_stdout;
689 treat_stdin();
690 to_stdout = cflag;
691 return;
692 }
693
694 /* Check if the input file is present, set ifname and istat: */
695 ifd = open_input_file (iname, &istat);
696 if (ifd < 0)
697 return;
698
699 /* If the input name is that of a directory, recurse or ignore: */
700 if (S_ISDIR(istat.st_mode)) {
701#if ! NO_DIR
702 if (recursive) {
703 treat_dir (ifd, iname);
704 /* Warning: ifname is now garbage */
705 return;
706 }
707#endif
708 close (ifd);
709 WARN ((stderr, "%s: %s is a directory -- ignored\n",
710 program_name, ifname));
711 return;
712 }
713
714 if (! to_stdout)
715 {
716 if (! S_ISREG (istat.st_mode))
717 {
718 WARN ((stderr,
719 "%s: %s is not a directory or a regular file - ignored\n",
720 program_name, ifname));
721 close (ifd);
722 return;
723 }
724 if (istat.st_mode & S_ISUID)
725 {
726 WARN ((stderr, "%s: %s is set-user-ID on execution - ignored\n",
727 program_name, ifname));
728 close (ifd);
729 return;
730 }
731 if (istat.st_mode & S_ISGID)
732 {
733 WARN ((stderr, "%s: %s is set-group-ID on execution - ignored\n",
734 program_name, ifname));
735 close (ifd);
736 return;
737 }
738
739 if (! force)
740 {
741 if (istat.st_mode & S_ISVTX)
742 {
743 WARN ((stderr,
744 "%s: %s has the sticky bit set - file ignored\n",
745 program_name, ifname));
746 close (ifd);
747 return;
748 }
749 if (2 <= istat.st_nlink)
750 {
751 WARN ((stderr, "%s: %s has %lu other link%c -- unchanged\n",
752 program_name, ifname,
753 (unsigned long int) istat.st_nlink - 1,
754 istat.st_nlink == 2 ? ' ' : 's'));
755 close (ifd);
756 return;
757 }
758 }
759 }
760
761 ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1;
762 time_stamp.tv_nsec = -1;
763 if (!no_time || list)
764 time_stamp = get_stat_mtime (&istat);
765
766 /* Generate output file name. For -r and (-t or -l), skip files
767 * without a valid gzip suffix (check done in make_ofname).
768 */
769 if (to_stdout && !list && !test) {
770 strcpy(ofname, "stdout");
771
772 } else if (make_ofname() != OK) {
773 close (ifd);
774 return;
775 }
776
777 clear_bufs(); /* clear input and output buffers */
778 part_nb = 0;
779
780 if (decompress) {
781 method = get_method(ifd); /* updates ofname if original given */
782 if (method < 0) {
783 close(ifd);
784 return; /* error message already emitted */
785 }
786 }
787 if (list) {
788 do_list(ifd, method);
789 if (close (ifd) != 0)
790 read_error ();
791 return;
792 }
793
794 /* If compressing to a file, check if ofname is not ambiguous
795 * because the operating system truncates names. Otherwise, generate
796 * a new ofname and save the original name in the compressed file.
797 */
798 if (to_stdout) {
799 ofd = fileno(stdout);
800 /* Keep remove_ofname_fd negative. */
801 } else {
802 if (create_outfile() != OK) return;
803
804 if (!decompress && save_orig_name && !verbose && !quiet) {
805 fprintf(stderr, "%s: %s compressed to %s\n",
806 program_name, ifname, ofname);
807 }
808 }
809 /* Keep the name even if not truncated except with --no-name: */
810 if (!save_orig_name) save_orig_name = !no_name;
811
812 if (verbose) {
813 fprintf(stderr, "%s:\t", ifname);
814 }
815
816 /* Actually do the compression/decompression. Loop over zipped members.
817 */
818 for (;;) {
819 if ((*work)(ifd, ofd) != OK) {
820 method = -1; /* force cleanup */
821 break;
822 }
823
824 if (input_eof ())
825 break;
826
827 method = get_method(ifd);
828 if (method < 0) break; /* error message already emitted */
829 bytes_out = 0; /* required for length check */
830 }
831
832 if (close (ifd) != 0)
833 read_error ();
834
835 if (!to_stdout)
836 {
837 sigset_t oldset;
838 int unlink_errno;
839
840 copy_stat (&istat);
841 if (close (ofd) != 0)
842 write_error ();
843
844 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
845 remove_ofname_fd = -1;
846 unlink_errno = xunlink (ifname) == 0 ? 0 : errno;
847 sigprocmask (SIG_SETMASK, &oldset, NULL);
848
849 if (unlink_errno)
850 {
851 WARN ((stderr, "%s: ", program_name));
852 if (!quiet)
853 {
854 errno = unlink_errno;
855 perror (ifname);
856 }
857 }
858 }
859
860 if (method == -1) {
861 if (!to_stdout)
862 remove_output_file ();
863 return;
864 }
865
866 /* Display statistics */
867 if(verbose) {
868 if (test) {
869 fprintf(stderr, " OK");
870 } else if (decompress) {
871 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr);
872 } else {
873 display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr);
874 }
875 if (!test && !to_stdout) {
876 fprintf(stderr, " -- replaced with %s", ofname);
877 }
878 fprintf(stderr, "\n");
879 }
880}
881
882/* ========================================================================
883 * Create the output file. Return OK or ERROR.
884 * Try several times if necessary to avoid truncating the z_suffix. For
885 * example, do not create a compressed file of name "1234567890123."
886 * Sets save_orig_name to true if the file name has been truncated.
887 * IN assertions: the input file has already been open (ifd is set) and
888 * ofname has already been updated if there was an original name.
889 * OUT assertions: ifd and ofd are closed in case of error.
890 */
891local int create_outfile()
892{
893 int name_shortened = 0;
894 int flags = (O_WRONLY | O_CREAT | O_EXCL
895 | (ascii && decompress ? 0 : O_BINARY));
896
897 for (;;)
898 {
899 int open_errno;
900 sigset_t oldset;
901
902 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
903 remove_ofname_fd = ofd = OPEN (ofname, flags, RW_USER);
904 open_errno = errno;
905 sigprocmask (SIG_SETMASK, &oldset, NULL);
906
907 if (0 <= ofd)
908 break;
909
910 switch (open_errno)
911 {
912#ifdef ENAMETOOLONG
913 case ENAMETOOLONG:
914 shorten_name (ofname);
915 name_shortened = 1;
916 break;
917#endif
918
919 case EEXIST:
920 if (check_ofname () != OK)
921 {
922 close (ifd);
923 return ERROR;
924 }
925 break;
926
927 default:
928 progerror (ofname);
929 close (ifd);
930 return ERROR;
931 }
932 }
933
934 if (name_shortened && decompress)
935 {
936 /* name might be too long if an original name was saved */
937 WARN ((stderr, "%s: %s: warning, name truncated\n",
938 program_name, ofname));
939 }
940
941 return OK;
942}
943
944/* ========================================================================
945 * Return a pointer to the 'z' suffix of a file name, or NULL. For all
946 * systems, ".gz", ".z", ".Z", ".taz", ".tgz", "-gz", "-z" and "_z" are
947 * accepted suffixes, in addition to the value of the --suffix option.
948 * ".tgz" is a useful convention for tar.z files on systems limited
949 * to 3 characters extensions. On such systems, ".?z" and ".??z" are
950 * also accepted suffixes. For Unix, we do not want to accept any
951 * .??z suffix as indicating a compressed file; some people use .xyz
952 * to denote volume data.
953 * On systems allowing multiple versions of the same file (such as VMS),
954 * this function removes any version suffix in the given name.
955 */
956local char *get_suffix(name)
957 char *name;
958{
959 int nlen, slen;
960 char suffix[MAX_SUFFIX+3]; /* last chars of name, forced to lower case */
961 static char *known_suffixes[] =
962 {NULL, ".gz", ".z", ".taz", ".tgz", "-gz", "-z", "_z",
963#ifdef MAX_EXT_CHARS
964 "z",
965#endif
966 NULL};
967 char **suf = known_suffixes;
968
969 *suf = z_suffix;
970 if (strequ(z_suffix, "z")) suf++; /* check long suffixes first */
971
972#ifdef SUFFIX_SEP
973 /* strip a version number from the file name */
974 {
975 char *v = strrchr(name, SUFFIX_SEP);
976 if (v != NULL) *v = '\0';
977 }
978#endif
979 nlen = strlen(name);
980 if (nlen <= MAX_SUFFIX+2) {
981 strcpy(suffix, name);
982 } else {
983 strcpy(suffix, name+nlen-MAX_SUFFIX-2);
984 }
985 strlwr(suffix);
986 slen = strlen(suffix);
987 do {
988 int s = strlen(*suf);
989 if (slen > s && suffix[slen-s-1] != PATH_SEP
990 && strequ(suffix + slen - s, *suf)) {
991 return name+nlen-s;
992 }
993 } while (*++suf != NULL);
994
995 return NULL;
996}
997
998
999/* Open file NAME with the given flags and mode and store its status
1000 into *ST. Return a file descriptor to the newly opened file, or -1
1001 (setting errno) on failure. */
1002static int
1003open_and_stat (char *name, int flags, mode_t mode, struct stat *st)
1004{
1005 int fd;
1006
1007 /* Refuse to follow symbolic links unless -c or -f. */
1008 if (!to_stdout && !force)
1009 {
1010 if (HAVE_WORKING_O_NOFOLLOW)
1011 flags |= O_NOFOLLOW;
1012 else
1013 {
1014#if HAVE_LSTAT || defined lstat
1015 if (lstat (name, st) != 0)
1016 return -1;
1017 else if (S_ISLNK (st->st_mode))
1018 {
1019 errno = ELOOP;
1020 return -1;
1021 }
1022#endif
1023 }
1024 }
1025
1026 fd = OPEN (name, flags, mode);
1027 if (0 <= fd && fstat (fd, st) != 0)
1028 {
1029 int e = errno;
1030 close (fd);
1031 errno = e;
1032 return -1;
1033 }
1034 return fd;
1035}
1036
1037
1038/* ========================================================================
1039 * Set ifname to the input file name (with a suffix appended if necessary)
1040 * and istat to its stats. For decompression, if no file exists with the
1041 * original name, try adding successively z_suffix, .gz, .z, -z and .Z.
1042 * For MSDOS, we try only z_suffix and z.
1043 * Return an open file descriptor or -1.
1044 */
1045static int
1046open_input_file (iname, sbuf)
1047 char *iname;
1048 struct stat *sbuf;
1049{
1050 int ilen; /* strlen(ifname) */
1051 int z_suffix_errno = 0;
1052 static char *suffixes[] = {NULL, ".gz", ".z", "-z", ".Z", NULL};
1053 char **suf = suffixes;
1054 char *s;
1055#ifdef NO_MULTIPLE_DOTS
1056 char *dot; /* pointer to ifname extension, or NULL */
1057#endif
1058 int fd;
1059 int open_flags = (O_RDONLY | O_NONBLOCK | O_NOCTTY
1060 | (ascii && !decompress ? 0 : O_BINARY));
1061
1062 *suf = z_suffix;
1063
1064 if (sizeof ifname - 1 <= strlen (iname))
1065 goto name_too_long;
1066
1067 strcpy(ifname, iname);
1068
1069 /* If input file exists, return OK. */
1070 fd = open_and_stat (ifname, open_flags, RW_USER, sbuf);
1071 if (0 <= fd)
1072 return fd;
1073
1074 if (!decompress || errno != ENOENT) {
1075 progerror(ifname);
1076 return -1;
1077 }
1078 /* file.ext doesn't exist, try adding a suffix (after removing any
1079 * version number for VMS).
1080 */
1081 s = get_suffix(ifname);
1082 if (s != NULL) {
1083 progerror(ifname); /* ifname already has z suffix and does not exist */
1084 return -1;
1085 }
1086#ifdef NO_MULTIPLE_DOTS
1087 dot = strrchr(ifname, '.');
1088 if (dot == NULL) {
1089 strcat(ifname, ".");
1090 dot = strrchr(ifname, '.');
1091 }
1092#endif
1093 ilen = strlen(ifname);
1094 if (strequ(z_suffix, ".gz")) suf++;
1095
1096 /* Search for all suffixes */
1097 do {
1098 char *s0 = s = *suf;
1099 strcpy (ifname, iname);
1100#ifdef NO_MULTIPLE_DOTS
1101 if (*s == '.') s++;
1102 if (*dot == '\0') strcpy (dot, ".");
1103#endif
1104#ifdef MAX_EXT_CHARS
1105 if (MAX_EXT_CHARS < strlen (s) + strlen (dot + 1))
1106 dot[MAX_EXT_CHARS + 1 - strlen (s)] = '\0';
1107#endif
1108 if (sizeof ifname <= ilen + strlen (s))
1109 goto name_too_long;
1110 strcat(ifname, s);
1111 fd = open_and_stat (ifname, open_flags, RW_USER, sbuf);
1112 if (0 <= fd)
1113 return fd;
1114 if (errno != ENOENT)
1115 {
1116 progerror (ifname);
1117 return -1;
1118 }
1119 if (strequ (s0, z_suffix))
1120 z_suffix_errno = errno;
1121 } while (*++suf != NULL);
1122
1123 /* No suffix found, complain using z_suffix: */
1124 strcpy(ifname, iname);
1125#ifdef NO_MULTIPLE_DOTS
1126 if (*dot == '\0') strcpy(dot, ".");
1127#endif
1128#ifdef MAX_EXT_CHARS
1129 if (MAX_EXT_CHARS < z_len + strlen (dot + 1))
1130 dot[MAX_EXT_CHARS + 1 - z_len] = '\0';
1131#endif
1132 strcat(ifname, z_suffix);
1133 errno = z_suffix_errno;
1134 progerror(ifname);
1135 return -1;
1136
1137 name_too_long:
1138 fprintf (stderr, "%s: %s: file name too long\n", program_name, iname);
1139 exit_code = ERROR;
1140 return -1;
1141}
1142
1143/* ========================================================================
1144 * Generate ofname given ifname. Return OK, or WARNING if file must be skipped.
1145 * Sets save_orig_name to true if the file name has been truncated.
1146 */
1147local int make_ofname()
1148{
1149 char *suff; /* ofname z suffix */
1150
1151 strcpy(ofname, ifname);
1152 /* strip a version number if any and get the gzip suffix if present: */
1153 suff = get_suffix(ofname);
1154
1155 if (decompress) {
1156 if (suff == NULL) {
1157 /* With -t or -l, try all files (even without .gz suffix)
1158 * except with -r (behave as with just -dr).
1159 */
1160 if (!recursive && (list || test)) return OK;
1161
1162 /* Avoid annoying messages with -r */
1163 if (verbose || (!recursive && !quiet)) {
1164 WARN((stderr,"%s: %s: unknown suffix -- ignored\n",
1165 program_name, ifname));
1166 }
1167 return WARNING;
1168 }
1169 /* Make a special case for .tgz and .taz: */
1170 strlwr(suff);
1171 if (strequ(suff, ".tgz") || strequ(suff, ".taz")) {
1172 strcpy(suff, ".tar");
1173 } else {
1174 *suff = '\0'; /* strip the z suffix */
1175 }
1176 /* ofname might be changed later if infile contains an original name */
1177
1178 } else if (suff != NULL) {
1179 /* Avoid annoying messages with -r (see treat_dir()) */
1180 if (verbose || (!recursive && !quiet)) {
1181 /* Don't use WARN, as it affects exit status. */
1182 fprintf (stderr, "%s: %s already has %s suffix -- unchanged\n",
1183 program_name, ifname, suff);
1184 }
1185 return WARNING;
1186 } else {
1187 save_orig_name = 0;
1188
1189#ifdef NO_MULTIPLE_DOTS
1190 suff = strrchr(ofname, '.');
1191 if (suff == NULL) {
1192 if (sizeof ofname <= strlen (ofname) + 1)
1193 goto name_too_long;
1194 strcat(ofname, ".");
1195# ifdef MAX_EXT_CHARS
1196 if (strequ(z_suffix, "z")) {
1197 if (sizeof ofname <= strlen (ofname) + 2)
1198 goto name_too_long;
1199 strcat(ofname, "gz"); /* enough room */
1200 return OK;
1201 }
1202 /* On the Atari and some versions of MSDOS,
1203 * ENAMETOOLONG does not work correctly. So we
1204 * must truncate here.
1205 */
1206 } else if (strlen(suff)-1 + z_len > MAX_SUFFIX) {
1207 suff[MAX_SUFFIX+1-z_len] = '\0';
1208 save_orig_name = 1;
1209# endif
1210 }
1211#endif /* NO_MULTIPLE_DOTS */
1212 if (sizeof ofname <= strlen (ofname) + z_len)
1213 goto name_too_long;
1214 strcat(ofname, z_suffix);
1215
1216 } /* decompress ? */
1217 return OK;
1218
1219 name_too_long:
1220 WARN ((stderr, "%s: %s: file name too long\n", program_name, ifname));
1221 return WARNING;
1222}
1223
1224
1225/* ========================================================================
1226 * Check the magic number of the input file and update ofname if an
1227 * original name was given and to_stdout is not set.
1228 * Return the compression method, -1 for error, -2 for warning.
1229 * Set inptr to the offset of the next byte to be processed.
1230 * Updates time_stamp if there is one and --no-time is not used.
1231 * This function may be called repeatedly for an input file consisting
1232 * of several contiguous gzip'ed members.
1233 * IN assertions: there is at least one remaining compressed member.
1234 * If the member is a zip file, it must be the only one.
1235 */
1236local int get_method(in)
1237 int in; /* input file descriptor */
1238{
1239 uch flags; /* compression flags */
1240 char magic[2]; /* magic header */
1241 int imagic1; /* like magic[1], but can represent EOF */
1242 ulg stamp; /* time stamp */
1243
1244 /* If --force and --stdout, zcat == cat, so do not complain about
1245 * premature end of file: use try_byte instead of get_byte.
1246 */
1247 if (force && to_stdout) {
1248 magic[0] = (char)try_byte();
1249 imagic1 = try_byte ();
1250 magic[1] = (char) imagic1;
1251 /* If try_byte returned EOF, magic[1] == (char) EOF. */
1252 } else {
1253 magic[0] = (char)get_byte();
1254 magic[1] = (char)get_byte();
1255 imagic1 = 0; /* avoid lint warning */
1256 }
1257 method = -1; /* unknown yet */
1258 part_nb++; /* number of parts in gzip file */
1259 header_bytes = 0;
1260 last_member = RECORD_IO;
1261 /* assume multiple members in gzip file except for record oriented I/O */
1262
1263 if (memcmp(magic, GZIP_MAGIC, 2) == 0
1264 || memcmp(magic, OLD_GZIP_MAGIC, 2) == 0) {
1265
1266 method = (int)get_byte();
1267 if (method != DEFLATED) {
1268 fprintf(stderr,
1269 "%s: %s: unknown method %d -- not supported\n",
1270 program_name, ifname, method);
1271 exit_code = ERROR;
1272 return -1;
1273 }
1274 work = unzip;
1275 flags = (uch)get_byte();
1276
1277 if ((flags & ENCRYPTED) != 0) {
1278 fprintf(stderr,
1279 "%s: %s is encrypted -- not supported\n",
1280 program_name, ifname);
1281 exit_code = ERROR;
1282 return -1;
1283 }
1284 if ((flags & CONTINUATION) != 0) {
1285 fprintf(stderr,
1286 "%s: %s is a a multi-part gzip file -- not supported\n",
1287 program_name, ifname);
1288 exit_code = ERROR;
1289 if (force <= 1) return -1;
1290 }
1291 if ((flags & RESERVED) != 0) {
1292 fprintf(stderr,
1293 "%s: %s has flags 0x%x -- not supported\n",
1294 program_name, ifname, flags);
1295 exit_code = ERROR;
1296 if (force <= 1) return -1;
1297 }
1298 stamp = (ulg)get_byte();
1299 stamp |= ((ulg)get_byte()) << 8;
1300 stamp |= ((ulg)get_byte()) << 16;
1301 stamp |= ((ulg)get_byte()) << 24;
1302 if (stamp != 0 && !no_time)
1303 {
1304 time_stamp.tv_sec = stamp;
1305 time_stamp.tv_nsec = 0;
1306 }
1307
1308 (void)get_byte(); /* Ignore extra flags for the moment */
1309 (void)get_byte(); /* Ignore OS type for the moment */
1310
1311 if ((flags & CONTINUATION) != 0) {
1312 unsigned part = (unsigned)get_byte();
1313 part |= ((unsigned)get_byte())<<8;
1314 if (verbose) {
1315 fprintf(stderr,"%s: %s: part number %u\n",
1316 program_name, ifname, part);
1317 }
1318 }
1319 if ((flags & EXTRA_FIELD) != 0) {
1320 unsigned len = (unsigned)get_byte();
1321 len |= ((unsigned)get_byte())<<8;
1322 if (verbose) {
1323 fprintf(stderr,"%s: %s: extra field of %u bytes ignored\n",
1324 program_name, ifname, len);
1325 }
1326 while (len--) (void)get_byte();
1327 }
1328
1329 /* Get original file name if it was truncated */
1330 if ((flags & ORIG_NAME) != 0) {
1331 if (no_name || (to_stdout && !list) || part_nb > 1) {
1332 /* Discard the old name */
1333 char c; /* dummy used for NeXTstep 3.0 cc optimizer bug */
1334 do {c=get_byte();} while (c != 0);
1335 } else {
1336 /* Copy the base name. Keep a directory prefix intact. */
1337 char *p = gzip_base_name (ofname);
1338 char *base = p;
1339 for (;;) {
1340 *p = (char)get_char();
1341 if (*p++ == '\0') break;
1342 if (p >= ofname+sizeof(ofname)) {
1343 gzip_error ("corrupted input -- file name too large");
1344 }
1345 }
1346 p = gzip_base_name (base);
1347 memmove (base, p, strlen (p) + 1);
1348 /* If necessary, adapt the name to local OS conventions: */
1349 if (!list) {
1350 MAKE_LEGAL_NAME(base);
1351 if (base) list=0; /* avoid warning about unused variable */
1352 }
1353 } /* no_name || to_stdout */
1354 } /* ORIG_NAME */
1355
1356 /* Discard file comment if any */
1357 if ((flags & COMMENT) != 0) {
1358 while (get_char() != 0) /* null */ ;
1359 }
1360 if (part_nb == 1) {
1361 header_bytes = inptr + 2*sizeof(long); /* include crc and size */
1362 }
1363
1364 } else if (memcmp(magic, PKZIP_MAGIC, 2) == 0 && inptr == 2
1365 && memcmp((char*)inbuf, PKZIP_MAGIC, 4) == 0) {
1366 /* To simplify the code, we support a zip file when alone only.
1367 * We are thus guaranteed that the entire local header fits in inbuf.
1368 */
1369 inptr = 0;
1370 work = unzip;
1371 if (check_zipfile(in) != OK) return -1;
1372 /* check_zipfile may get ofname from the local header */
1373 last_member = 1;
1374
1375 } else if (memcmp(magic, PACK_MAGIC, 2) == 0) {
1376 work = unpack;
1377 method = PACKED;
1378
1379 } else if (memcmp(magic, LZW_MAGIC, 2) == 0) {
1380 work = unlzw;
1381 method = COMPRESSED;
1382 last_member = 1;
1383
1384 } else if (memcmp(magic, LZH_MAGIC, 2) == 0) {
1385 work = unlzh;
1386 method = LZHED;
1387 last_member = 1;
1388
1389 } else if (force && to_stdout && !list) { /* pass input unchanged */
1390 method = STORED;
1391 work = copy;
1392 inptr = 0;
1393 last_member = 1;
1394 }
1395 if (method >= 0) return method;
1396
1397 if (part_nb == 1) {
1398 fprintf (stderr, "\n%s: %s: not in gzip format\n",
1399 program_name, ifname);
1400 exit_code = ERROR;
1401 return -1;
1402 } else {
1403 if (magic[0] == 0)
1404 {
1405 int inbyte;
1406 for (inbyte = imagic1; inbyte == 0; inbyte = try_byte ())
1407 continue;
1408 if (inbyte == EOF)
1409 {
1410 if (verbose)
1411 WARN ((stderr, "\n%s: %s: decompression OK, trailing zero bytes ignored\n",
1412 program_name, ifname));
1413 return -3;
1414 }
1415 }
1416
1417 WARN((stderr, "\n%s: %s: decompression OK, trailing garbage ignored\n",
1418 program_name, ifname));
1419 return -2;
1420 }
1421}
1422
1423/* ========================================================================
1424 * Display the characteristics of the compressed file.
1425 * If the given method is < 0, display the accumulated totals.
1426 * IN assertions: time_stamp, header_bytes and ifile_size are initialized.
1427 */
1428local void do_list(ifd, method)
1429 int ifd; /* input file descriptor */
1430 int method; /* compression method */
1431{
1432 ulg crc; /* original crc */
1433 static int first_time = 1;
1434 static char* methods[MAX_METHODS] = {
1435 "store", /* 0 */
1436 "compr", /* 1 */
1437 "pack ", /* 2 */
1438 "lzh ", /* 3 */
1439 "", "", "", "", /* 4 to 7 reserved */
1440 "defla"}; /* 8 */
1441 int positive_off_t_width = 1;
1442 off_t o;
1443
1444 for (o = OFF_T_MAX; 9 < o; o /= 10) {
1445 positive_off_t_width++;
1446 }
1447
1448 if (first_time && method >= 0) {
1449 first_time = 0;
1450 if (verbose) {
1451 printf("method crc date time ");
1452 }
1453 if (!quiet) {
1454 printf("%*.*s %*.*s ratio uncompressed_name\n",
1455 positive_off_t_width, positive_off_t_width, "compressed",
1456 positive_off_t_width, positive_off_t_width, "uncompressed");
1457 }
1458 } else if (method < 0) {
1459 if (total_in <= 0 || total_out <= 0) return;
1460 if (verbose) {
1461 printf(" ");
1462 }
1463 if (verbose || !quiet) {
1464 fprint_off(stdout, total_in, positive_off_t_width);
1465 printf(" ");
1466 fprint_off(stdout, total_out, positive_off_t_width);
1467 printf(" ");
1468 }
1469 display_ratio(total_out-(total_in-header_bytes), total_out, stdout);
1470 /* header_bytes is not meaningful but used to ensure the same
1471 * ratio if there is a single file.
1472 */
1473 printf(" (totals)\n");
1474 return;
1475 }
1476 crc = (ulg)~0; /* unknown */
1477 bytes_out = -1L;
1478 bytes_in = ifile_size;
1479
1480#if RECORD_IO == 0
1481 if (method == DEFLATED && !last_member) {
1482 /* Get the crc and uncompressed size for gzip'ed (not zip'ed) files.
1483 * If the lseek fails, we could use read() to get to the end, but
1484 * --list is used to get quick results.
1485 * Use "gunzip < foo.gz | wc -c" to get the uncompressed size if
1486 * you are not concerned about speed.
1487 */
1488 bytes_in = lseek(ifd, (off_t)(-8), SEEK_END);
1489 if (bytes_in != -1L) {
1490 uch buf[8];
1491 bytes_in += 8L;
1492 if (read(ifd, (char*)buf, sizeof(buf)) != sizeof(buf)) {
1493 read_error();
1494 }
1495 crc = LG(buf);
1496 bytes_out = LG(buf+4);
1497 }
1498 }
1499#endif /* RECORD_IO */
1500 if (verbose)
1501 {
1502 struct tm *tm = localtime (&time_stamp.tv_sec);
1503 printf ("%5s %08lx ", methods[method], crc);
1504 if (tm)
1505 printf ("%s%3d %02d:%02d ",
1506 ("Jan\0Feb\0Mar\0Apr\0May\0Jun\0Jul\0Aug\0Sep\0Oct\0Nov\0Dec"
1507 + 4 * tm->tm_mon),
1508 tm->tm_mday, tm->tm_hour, tm->tm_min);
1509 else
1510 printf ("??? ?? ??:?? ");
1511 }
1512 fprint_off(stdout, bytes_in, positive_off_t_width);
1513 printf(" ");
1514 fprint_off(stdout, bytes_out, positive_off_t_width);
1515 printf(" ");
1516 if (bytes_in == -1L) {
1517 total_in = -1L;
1518 bytes_in = bytes_out = header_bytes = 0;
1519 } else if (total_in >= 0) {
1520 total_in += bytes_in;
1521 }
1522 if (bytes_out == -1L) {
1523 total_out = -1L;
1524 bytes_in = bytes_out = header_bytes = 0;
1525 } else if (total_out >= 0) {
1526 total_out += bytes_out;
1527 }
1528 display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out, stdout);
1529 printf(" %s\n", ofname);
1530}
1531
1532/* ========================================================================
1533 * Shorten the given name by one character, or replace a .tar extension
1534 * with .tgz. Truncate the last part of the name which is longer than
1535 * MIN_PART characters: 1234.678.012.gz -> 123.678.012.gz. If the name
1536 * has only parts shorter than MIN_PART truncate the longest part.
1537 * For decompression, just remove the last character of the name.
1538 *
1539 * IN assertion: for compression, the suffix of the given name is z_suffix.
1540 */
1541local void shorten_name(name)
1542 char *name;
1543{
1544 int len; /* length of name without z_suffix */
1545 char *trunc = NULL; /* character to be truncated */
1546 int plen; /* current part length */
1547 int min_part = MIN_PART; /* current minimum part length */
1548 char *p;
1549
1550 len = strlen(name);
1551 if (decompress) {
1552 if (len <= 1)
1553 gzip_error ("name too short");
1554 name[len-1] = '\0';
1555 return;
1556 }
1557 p = get_suffix(name);
1558 if (! p)
1559 gzip_error ("can't recover suffix\n");
1560 *p = '\0';
1561 save_orig_name = 1;
1562
1563 /* compress 1234567890.tar to 1234567890.tgz */
1564 if (len > 4 && strequ(p-4, ".tar")) {
1565 strcpy(p-4, ".tgz");
1566 return;
1567 }
1568 /* Try keeping short extensions intact:
1569 * 1234.678.012.gz -> 123.678.012.gz
1570 */
1571 do {
1572 p = strrchr(name, PATH_SEP);
1573 p = p ? p+1 : name;
1574 while (*p) {
1575 plen = strcspn(p, PART_SEP);
1576 p += plen;
1577 if (plen > min_part) trunc = p-1;
1578 if (*p) p++;
1579 }
1580 } while (trunc == NULL && --min_part != 0);
1581
1582 if (trunc != NULL) {
1583 do {
1584 trunc[0] = trunc[1];
1585 } while (*trunc++);
1586 trunc--;
1587 } else {
1588 trunc = strrchr(name, PART_SEP[0]);
1589 if (!trunc)
1590 gzip_error ("internal error in shorten_name");
1591 if (trunc[1] == '\0') trunc--; /* force truncation */
1592 }
1593 strcpy(trunc, z_suffix);
1594}
1595
1596/* ========================================================================
1597 * The compressed file already exists, so ask for confirmation.
1598 * Return ERROR if the file must be skipped.
1599 */
1600local int check_ofname()
1601{
1602 /* Ask permission to overwrite the existing file */
1603 if (!force) {
1604 int ok = 0;
1605 fprintf (stderr, "%s: %s already exists;", program_name, ofname);
1606 if (foreground && isatty(fileno(stdin))) {
1607 fprintf(stderr, " do you wish to overwrite (y or n)? ");
1608 fflush(stderr);
1609 ok = yesno();
1610 }
1611 if (!ok) {
1612 fprintf(stderr, "\tnot overwritten\n");
1613 if (exit_code == OK) exit_code = WARNING;
1614 return ERROR;
1615 }
1616 }
1617 if (xunlink (ofname)) {
1618 progerror(ofname);
1619 return ERROR;
1620 }
1621 return OK;
1622}
1623
1624
1625/* ========================================================================
1626 * Copy modes, times, ownership from input file to output file.
1627 * IN assertion: to_stdout is false.
1628 */
1629local void copy_stat(ifstat)
1630 struct stat *ifstat;
1631{
1632 mode_t mode = ifstat->st_mode & S_IRWXUGO;
1633 int r;
1634
1635#ifndef NO_UTIME
1636 struct timespec timespec[2];
1637 timespec[0] = get_stat_atime (ifstat);
1638 timespec[1] = get_stat_mtime (ifstat);
1639
1640 if (decompress && 0 <= time_stamp.tv_nsec
1641 && ! (timespec[1].tv_sec == time_stamp.tv_sec
1642 && timespec[1].tv_nsec == time_stamp.tv_nsec))
1643 {
1644 timespec[1] = time_stamp;
1645 if (verbose > 1) {
1646 fprintf(stderr, "%s: time stamp restored\n", ofname);
1647 }
1648 }
1649
1650 if (futimens (ofd, ofname, timespec) != 0)
1651 {
1652 int e = errno;
1653 WARN ((stderr, "%s: ", program_name));
1654 if (!quiet)
1655 {
1656 errno = e;
1657 perror (ofname);
1658 }
1659 }
1660#endif
1661
1662#ifndef NO_CHOWN
1663# if HAVE_FCHOWN
1664 fchown (ofd, ifstat->st_uid, ifstat->st_gid); /* Copy ownership */
1665# elif HAVE_CHOWN
1666 chown(ofname, ifstat->st_uid, ifstat->st_gid); /* Copy ownership */
1667# endif
1668#endif
1669
1670 /* Copy the protection modes */
1671#if HAVE_FCHMOD
1672 r = fchmod (ofd, mode);
1673#else
1674 r = chmod (ofname, mode);
1675#endif
1676 if (r != 0) {
1677 int e = errno;
1678 WARN ((stderr, "%s: ", program_name));
1679 if (!quiet) {
1680 errno = e;
1681 perror(ofname);
1682 }
1683 }
1684}
1685
1686#if ! NO_DIR
1687
1688/* ========================================================================
1689 * Recurse through the given directory. This code is taken from ncompress.
1690 */
1691local void treat_dir (fd, dir)
1692 int fd;
1693 char *dir;
1694{
1695 struct dirent *dp;
1696 DIR *dirp;
1697 char nbuf[MAX_PATH_LEN];
1698 int len;
1699
1700#if HAVE_FDOPENDIR
1701 dirp = fdopendir (fd);
1702#else
1703 close (fd);
1704 dirp = opendir(dir);
1705#endif
1706
1707 if (dirp == NULL) {
1708 progerror(dir);
1709#if HAVE_FDOPENDIR
1710 close (fd);
1711#endif
1712 return ;
1713 }
1714 /*
1715 ** WARNING: the following algorithm could occasionally cause
1716 ** compress to produce error warnings of the form "<filename>.gz
1717 ** already has .gz suffix - ignored". This occurs when the
1718 ** .gz output file is inserted into the directory below
1719 ** readdir's current pointer.
1720 ** These warnings are harmless but annoying, so they are suppressed
1721 ** with option -r (except when -v is on). An alternative
1722 ** to allowing this would be to store the entire directory
1723 ** list in memory, then compress the entries in the stored
1724 ** list. Given the depth-first recursive algorithm used here,
1725 ** this could use up a tremendous amount of memory. I don't
1726 ** think it's worth it. -- Dave Mack
1727 ** (An other alternative might be two passes to avoid depth-first.)
1728 */
1729
1730 while ((errno = 0, dp = readdir(dirp)) != NULL) {
1731
1732 if (strequ(dp->d_name,".") || strequ(dp->d_name,"..")) {
1733 continue;
1734 }
1735 len = strlen(dir);
1736 if (len + _D_EXACT_NAMLEN (dp) + 1 < MAX_PATH_LEN - 1) {
1737 strcpy(nbuf,dir);
1738 if (len != 0 /* dir = "" means current dir on Amiga */
1739#ifdef PATH_SEP2
1740 && dir[len-1] != PATH_SEP2
1741#endif
1742#ifdef PATH_SEP3
1743 && dir[len-1] != PATH_SEP3
1744#endif
1745 ) {
1746 nbuf[len++] = PATH_SEP;
1747 }
1748 strcpy(nbuf+len, dp->d_name);
1749 treat_file(nbuf);
1750 } else {
1751 fprintf(stderr,"%s: %s/%s: pathname too long\n",
1752 program_name, dir, dp->d_name);
1753 exit_code = ERROR;
1754 }
1755 }
1756 if (errno != 0)
1757 progerror(dir);
1758 if (CLOSEDIR(dirp) != 0)
1759 progerror(dir);
1760}
1761#endif /* ! NO_DIR */
1762
1763/* Make sure signals get handled properly. */
1764
1765static void
1766install_signal_handlers ()
1767{
1768 static int sig[] =
1769 {
1770 /* SIGINT must be first, as 'foreground' depends on it. */
1771 SIGINT
1772
1773#ifdef SIGHUP
1774 , SIGHUP
1775#endif
1776#ifdef SIGPIPE
1777 , SIGPIPE
1778#else
1779# define SIGPIPE 0
1780#endif
1781#ifdef SIGTERM
1782 , SIGTERM
1783#endif
1784#ifdef SIGXCPU
1785 , SIGXCPU
1786#endif
1787#ifdef SIGXFSZ
1788 , SIGXFSZ
1789#endif
1790 };
1791 int nsigs = sizeof sig / sizeof sig[0];
1792 int i;
1793
1794#if SA_NOCLDSTOP
1795 struct sigaction act;
1796
1797 sigemptyset (&caught_signals);
1798 for (i = 0; i < nsigs; i++)
1799 {
1800 sigaction (sig[i], NULL, &act);
1801 if (act.sa_handler != SIG_IGN)
1802 sigaddset (&caught_signals, sig[i]);
1803 }
1804
1805 act.sa_handler = abort_gzip_signal;
1806 act.sa_mask = caught_signals;
1807 act.sa_flags = 0;
1808
1809 for (i = 0; i < nsigs; i++)
1810 if (sigismember (&caught_signals, sig[i]))
1811 {
1812 if (i == 0)
1813 foreground = 1;
1814 sigaction (sig[i], &act, NULL);
1815 }
1816#else
1817 for (i = 0; i < nsigs; i++)
1818 if (signal (sig[i], SIG_IGN) != SIG_IGN)
1819 {
1820 if (i == 0)
1821 foreground = 1;
1822 signal (sig[i], abort_gzip_signal);
1823 siginterrupt (sig[i], 1);
1824 }
1825#endif
1826}
1827
1828/* ========================================================================
1829 * Free all dynamically allocated variables and exit with the given code.
1830 */
1831local void do_exit(exitcode)
1832 int exitcode;
1833{
1834 static int in_exit = 0;
1835
1836 if (in_exit) exit(exitcode);
1837 in_exit = 1;
1838 if (env != NULL) free(env), env = NULL;
1839 if (args != NULL) free((char*)args), args = NULL;
1840 FREE(inbuf);
1841 FREE(outbuf);
1842 FREE(d_buf);
1843 FREE(window);
1844#ifndef MAXSEG_64K
1845 FREE(tab_prefix);
1846#else
1847 FREE(tab_prefix0);
1848 FREE(tab_prefix1);
1849#endif
1850 exit(exitcode);
1851}
1852
1853/* ========================================================================
1854 * Close and unlink the output file.
1855 */
1856static void
1857remove_output_file ()
1858{
1859 int fd;
1860 sigset_t oldset;
1861
1862 sigprocmask (SIG_BLOCK, &caught_signals, &oldset);
1863 fd = remove_ofname_fd;
1864 if (0 <= fd)
1865 {
1866 remove_ofname_fd = -1;
1867 close (fd);
1868 xunlink (ofname);
1869 }
1870 sigprocmask (SIG_SETMASK, &oldset, NULL);
1871}
1872
1873/* ========================================================================
1874 * Error handler.
1875 */
1876void
1877abort_gzip ()
1878{
1879 remove_output_file ();
1880 do_exit(ERROR);
1881}
1882
1883/* ========================================================================
1884 * Signal handler.
1885 */
1886static RETSIGTYPE
1887abort_gzip_signal (sig)
1888 int sig;
1889{
1890 if (! SA_NOCLDSTOP)
1891 signal (sig, SIG_IGN);
1892 remove_output_file ();
1893 if (sig == exiting_signal)
1894 _exit (WARNING);
1895 signal (sig, SIG_DFL);
1896 raise (sig);
1897}
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