xref: /freebsd/usr.bin/gzip/gzip.c (revision cc426dd31990b8b50b210efc450e404596548ca1)
1 /*	$NetBSD: gzip.c,v 1.113 2018/06/12 00:42:17 kamil Exp $	*/
2 
3 /*-
4  * SPDX-License-Identifier: BSD-2-Clause-NetBSD
5  *
6  * Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008, 2009, 2010, 2011, 2015, 2017
7  *    Matthew R. Green
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  */
32 
33 #include <sys/cdefs.h>
34 #ifndef lint
35 __COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008,\
36  2009, 2010, 2011, 2015, 2017 Matthew R. Green.  All rights reserved.");
37 __FBSDID("$FreeBSD$");
38 #endif /* not lint */
39 
40 /*
41  * gzip.c -- GPL free gzip using zlib.
42  *
43  * RFC 1950 covers the zlib format
44  * RFC 1951 covers the deflate format
45  * RFC 1952 covers the gzip format
46  *
47  * TODO:
48  *	- use mmap where possible
49  *	- make bzip2/compress -v/-t/-l support work as well as possible
50  */
51 
52 #include <sys/endian.h>
53 #include <sys/param.h>
54 #include <sys/stat.h>
55 #include <sys/time.h>
56 
57 #include <inttypes.h>
58 #include <unistd.h>
59 #include <stdio.h>
60 #include <string.h>
61 #include <stdlib.h>
62 #include <err.h>
63 #include <errno.h>
64 #include <fcntl.h>
65 #include <zlib.h>
66 #include <fts.h>
67 #include <libgen.h>
68 #include <stdarg.h>
69 #include <getopt.h>
70 #include <time.h>
71 
72 /* what type of file are we dealing with */
73 enum filetype {
74 	FT_GZIP,
75 #ifndef NO_BZIP2_SUPPORT
76 	FT_BZIP2,
77 #endif
78 #ifndef NO_COMPRESS_SUPPORT
79 	FT_Z,
80 #endif
81 #ifndef NO_PACK_SUPPORT
82 	FT_PACK,
83 #endif
84 #ifndef NO_XZ_SUPPORT
85 	FT_XZ,
86 #endif
87 	FT_LAST,
88 	FT_UNKNOWN
89 };
90 
91 #ifndef NO_BZIP2_SUPPORT
92 #include <bzlib.h>
93 
94 #define BZ2_SUFFIX	".bz2"
95 #define BZIP2_MAGIC	"BZh"
96 #endif
97 
98 #ifndef NO_COMPRESS_SUPPORT
99 #define Z_SUFFIX	".Z"
100 #define Z_MAGIC		"\037\235"
101 #endif
102 
103 #ifndef NO_PACK_SUPPORT
104 #define PACK_MAGIC	"\037\036"
105 #endif
106 
107 #ifndef NO_XZ_SUPPORT
108 #include <lzma.h>
109 #define XZ_SUFFIX	".xz"
110 #define XZ_MAGIC	"\3757zXZ"
111 #endif
112 
113 #define GZ_SUFFIX	".gz"
114 
115 #define BUFLEN		(64 * 1024)
116 
117 #define GZIP_MAGIC0	0x1F
118 #define GZIP_MAGIC1	0x8B
119 #define GZIP_OMAGIC1	0x9E
120 
121 #define GZIP_TIMESTAMP	(off_t)4
122 #define GZIP_ORIGNAME	(off_t)10
123 
124 #define HEAD_CRC	0x02
125 #define EXTRA_FIELD	0x04
126 #define ORIG_NAME	0x08
127 #define COMMENT		0x10
128 
129 #define OS_CODE		3	/* Unix */
130 
131 typedef struct {
132     const char	*zipped;
133     int		ziplen;
134     const char	*normal;	/* for unzip - must not be longer than zipped */
135 } suffixes_t;
136 static suffixes_t suffixes[] = {
137 #define	SUFFIX(Z, N) {Z, sizeof Z - 1, N}
138 	SUFFIX(GZ_SUFFIX,	""),	/* Overwritten by -S .xxx */
139 #ifndef SMALL
140 	SUFFIX(GZ_SUFFIX,	""),
141 	SUFFIX(".z",		""),
142 	SUFFIX("-gz",		""),
143 	SUFFIX("-z",		""),
144 	SUFFIX("_z",		""),
145 	SUFFIX(".taz",		".tar"),
146 	SUFFIX(".tgz",		".tar"),
147 #ifndef NO_BZIP2_SUPPORT
148 	SUFFIX(BZ2_SUFFIX,	""),
149 	SUFFIX(".tbz",		".tar"),
150 	SUFFIX(".tbz2",		".tar"),
151 #endif
152 #ifndef NO_COMPRESS_SUPPORT
153 	SUFFIX(Z_SUFFIX,	""),
154 #endif
155 #ifndef NO_XZ_SUPPORT
156 	SUFFIX(XZ_SUFFIX,	""),
157 #endif
158 	SUFFIX(GZ_SUFFIX,	""),	/* Overwritten by -S "" */
159 #endif /* SMALL */
160 #undef SUFFIX
161 };
162 #define NUM_SUFFIXES (nitems(suffixes))
163 #define SUFFIX_MAXLEN	30
164 
165 static	const char	gzip_version[] = "FreeBSD gzip 20171121";
166 
167 #ifndef SMALL
168 static	const char	gzip_copyright[] = \
169 "   Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n"
170 "   All rights reserved.\n"
171 "\n"
172 "   Redistribution and use in source and binary forms, with or without\n"
173 "   modification, are permitted provided that the following conditions\n"
174 "   are met:\n"
175 "   1. Redistributions of source code must retain the above copyright\n"
176 "      notice, this list of conditions and the following disclaimer.\n"
177 "   2. Redistributions in binary form must reproduce the above copyright\n"
178 "      notice, this list of conditions and the following disclaimer in the\n"
179 "      documentation and/or other materials provided with the distribution.\n"
180 "\n"
181 "   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n"
182 "   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n"
183 "   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n"
184 "   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n"
185 "   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n"
186 "   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n"
187 "   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n"
188 "   AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n"
189 "   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n"
190 "   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n"
191 "   SUCH DAMAGE.";
192 #endif
193 
194 static	int	cflag;			/* stdout mode */
195 static	int	dflag;			/* decompress mode */
196 static	int	lflag;			/* list mode */
197 static	int	numflag = 6;		/* gzip -1..-9 value */
198 
199 static	const char *remove_file = NULL;	/* file to be removed upon SIGINT */
200 
201 static	int	fflag;			/* force mode */
202 #ifndef SMALL
203 static	int	kflag;			/* don't delete input files */
204 static	int	nflag;			/* don't save name/timestamp */
205 static	int	Nflag;			/* don't restore name/timestamp */
206 static	int	qflag;			/* quiet mode */
207 static	int	rflag;			/* recursive mode */
208 static	int	tflag;			/* test */
209 static	int	vflag;			/* verbose mode */
210 static	sig_atomic_t print_info = 0;
211 #else
212 #define		qflag	0
213 #define		tflag	0
214 #endif
215 
216 static	int	exit_value = 0;		/* exit value */
217 
218 static	const char *infile;		/* name of file coming in */
219 
220 static	void	maybe_err(const char *fmt, ...) __printflike(1, 2) __dead2;
221 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||	\
222     !defined(NO_XZ_SUPPORT)
223 static	void	maybe_errx(const char *fmt, ...) __printflike(1, 2) __dead2;
224 #endif
225 static	void	maybe_warn(const char *fmt, ...) __printflike(1, 2);
226 static	void	maybe_warnx(const char *fmt, ...) __printflike(1, 2);
227 static	enum filetype file_gettype(u_char *);
228 #ifdef SMALL
229 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz)
230 #endif
231 static	off_t	gz_compress(int, int, off_t *, const char *, uint32_t);
232 static	off_t	gz_uncompress(int, int, char *, size_t, off_t *, const char *);
233 static	off_t	file_compress(char *, char *, size_t);
234 static	off_t	file_uncompress(char *, char *, size_t);
235 static	void	handle_pathname(char *);
236 static	void	handle_file(char *, struct stat *);
237 static	void	handle_stdin(void);
238 static	void	handle_stdout(void);
239 static	void	print_ratio(off_t, off_t, FILE *);
240 static	void	print_list(int fd, off_t, const char *, time_t);
241 static	void	usage(void) __dead2;
242 static	void	display_version(void) __dead2;
243 #ifndef SMALL
244 static	void	display_license(void);
245 #endif
246 static	const suffixes_t *check_suffix(char *, int);
247 static	ssize_t	read_retry(int, void *, size_t);
248 static	ssize_t	write_retry(int, const void *, size_t);
249 
250 #ifdef SMALL
251 #define infile_set(f,t) infile_set(f)
252 #endif
253 static	void	infile_set(const char *newinfile, off_t total);
254 
255 #ifdef SMALL
256 #define unlink_input(f, sb) unlink(f)
257 #define check_siginfo() /* nothing */
258 #define setup_signals() /* nothing */
259 #define infile_newdata(t) /* nothing */
260 #else
261 static	off_t	infile_total;		/* total expected to read/write */
262 static	off_t	infile_current;		/* current read/write */
263 
264 static	void	check_siginfo(void);
265 static	off_t	cat_fd(unsigned char *, size_t, off_t *, int fd);
266 static	void	prepend_gzip(char *, int *, char ***);
267 static	void	handle_dir(char *);
268 static	void	print_verbage(const char *, const char *, off_t, off_t);
269 static	void	print_test(const char *, int);
270 static	void	copymodes(int fd, const struct stat *, const char *file);
271 static	int	check_outfile(const char *outfile);
272 static	void	setup_signals(void);
273 static	void	infile_newdata(size_t newdata);
274 static	void	infile_clear(void);
275 #endif
276 
277 #ifndef NO_BZIP2_SUPPORT
278 static	off_t	unbzip2(int, int, char *, size_t, off_t *);
279 #endif
280 
281 #ifndef NO_COMPRESS_SUPPORT
282 static	FILE 	*zdopen(int);
283 static	off_t	zuncompress(FILE *, FILE *, char *, size_t, off_t *);
284 #endif
285 
286 #ifndef NO_PACK_SUPPORT
287 static	off_t	unpack(int, int, char *, size_t, off_t *);
288 #endif
289 
290 #ifndef NO_XZ_SUPPORT
291 static	off_t	unxz(int, int, char *, size_t, off_t *);
292 #endif
293 
294 #ifdef SMALL
295 #define getopt_long(a,b,c,d,e) getopt(a,b,c)
296 #else
297 static const struct option longopts[] = {
298 	{ "stdout",		no_argument,		0,	'c' },
299 	{ "to-stdout",		no_argument,		0,	'c' },
300 	{ "decompress",		no_argument,		0,	'd' },
301 	{ "uncompress",		no_argument,		0,	'd' },
302 	{ "force",		no_argument,		0,	'f' },
303 	{ "help",		no_argument,		0,	'h' },
304 	{ "keep",		no_argument,		0,	'k' },
305 	{ "list",		no_argument,		0,	'l' },
306 	{ "no-name",		no_argument,		0,	'n' },
307 	{ "name",		no_argument,		0,	'N' },
308 	{ "quiet",		no_argument,		0,	'q' },
309 	{ "recursive",		no_argument,		0,	'r' },
310 	{ "suffix",		required_argument,	0,	'S' },
311 	{ "test",		no_argument,		0,	't' },
312 	{ "verbose",		no_argument,		0,	'v' },
313 	{ "version",		no_argument,		0,	'V' },
314 	{ "fast",		no_argument,		0,	'1' },
315 	{ "best",		no_argument,		0,	'9' },
316 	{ "ascii",		no_argument,		0,	'a' },
317 	{ "license",		no_argument,		0,	'L' },
318 	{ NULL,			no_argument,		0,	0 },
319 };
320 #endif
321 
322 int
323 main(int argc, char **argv)
324 {
325 	const char *progname = getprogname();
326 #ifndef SMALL
327 	char *gzip;
328 	int len;
329 #endif
330 	int ch;
331 
332 	setup_signals();
333 
334 #ifndef SMALL
335 	if ((gzip = getenv("GZIP")) != NULL)
336 		prepend_gzip(gzip, &argc, &argv);
337 #endif
338 
339 	/*
340 	 * XXX
341 	 * handle being called `gunzip', `zcat' and `gzcat'
342 	 */
343 	if (strcmp(progname, "gunzip") == 0)
344 		dflag = 1;
345 	else if (strcmp(progname, "zcat") == 0 ||
346 		 strcmp(progname, "gzcat") == 0)
347 		dflag = cflag = 1;
348 
349 #ifdef SMALL
350 #define OPT_LIST "123456789cdhlV"
351 #else
352 #define OPT_LIST "123456789acdfhklLNnqrS:tVv"
353 #endif
354 
355 	while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
356 		switch (ch) {
357 		case '1': case '2': case '3':
358 		case '4': case '5': case '6':
359 		case '7': case '8': case '9':
360 			numflag = ch - '0';
361 			break;
362 		case 'c':
363 			cflag = 1;
364 			break;
365 		case 'd':
366 			dflag = 1;
367 			break;
368 		case 'l':
369 			lflag = 1;
370 			dflag = 1;
371 			break;
372 		case 'V':
373 			display_version();
374 			/* NOTREACHED */
375 #ifndef SMALL
376 		case 'a':
377 			fprintf(stderr, "%s: option --ascii ignored on this system\n", progname);
378 			break;
379 		case 'f':
380 			fflag = 1;
381 			break;
382 		case 'k':
383 			kflag = 1;
384 			break;
385 		case 'L':
386 			display_license();
387 			/* NOT REACHED */
388 		case 'N':
389 			nflag = 0;
390 			Nflag = 1;
391 			break;
392 		case 'n':
393 			nflag = 1;
394 			Nflag = 0;
395 			break;
396 		case 'q':
397 			qflag = 1;
398 			break;
399 		case 'r':
400 			rflag = 1;
401 			break;
402 		case 'S':
403 			len = strlen(optarg);
404 			if (len != 0) {
405 				if (len > SUFFIX_MAXLEN)
406 					errx(1, "incorrect suffix: '%s': too long", optarg);
407 				suffixes[0].zipped = optarg;
408 				suffixes[0].ziplen = len;
409 			} else {
410 				suffixes[NUM_SUFFIXES - 1].zipped = "";
411 				suffixes[NUM_SUFFIXES - 1].ziplen = 0;
412 			}
413 			break;
414 		case 't':
415 			cflag = 1;
416 			tflag = 1;
417 			dflag = 1;
418 			break;
419 		case 'v':
420 			vflag = 1;
421 			break;
422 #endif
423 		default:
424 			usage();
425 			/* NOTREACHED */
426 		}
427 	}
428 	argv += optind;
429 	argc -= optind;
430 
431 	if (argc == 0) {
432 		if (dflag)	/* stdin mode */
433 			handle_stdin();
434 		else		/* stdout mode */
435 			handle_stdout();
436 	} else {
437 		do {
438 			handle_pathname(argv[0]);
439 		} while (*++argv);
440 	}
441 #ifndef SMALL
442 	if (qflag == 0 && lflag && argc > 1)
443 		print_list(-1, 0, "(totals)", 0);
444 #endif
445 	exit(exit_value);
446 }
447 
448 /* maybe print a warning */
449 void
450 maybe_warn(const char *fmt, ...)
451 {
452 	va_list ap;
453 
454 	if (qflag == 0) {
455 		va_start(ap, fmt);
456 		vwarn(fmt, ap);
457 		va_end(ap);
458 	}
459 	if (exit_value == 0)
460 		exit_value = 1;
461 }
462 
463 /* ... without an errno. */
464 void
465 maybe_warnx(const char *fmt, ...)
466 {
467 	va_list ap;
468 
469 	if (qflag == 0) {
470 		va_start(ap, fmt);
471 		vwarnx(fmt, ap);
472 		va_end(ap);
473 	}
474 	if (exit_value == 0)
475 		exit_value = 1;
476 }
477 
478 /* maybe print an error */
479 void
480 maybe_err(const char *fmt, ...)
481 {
482 	va_list ap;
483 
484 	if (qflag == 0) {
485 		va_start(ap, fmt);
486 		vwarn(fmt, ap);
487 		va_end(ap);
488 	}
489 	exit(2);
490 }
491 
492 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||	\
493     !defined(NO_XZ_SUPPORT)
494 /* ... without an errno. */
495 void
496 maybe_errx(const char *fmt, ...)
497 {
498 	va_list ap;
499 
500 	if (qflag == 0) {
501 		va_start(ap, fmt);
502 		vwarnx(fmt, ap);
503 		va_end(ap);
504 	}
505 	exit(2);
506 }
507 #endif
508 
509 #ifndef SMALL
510 /* split up $GZIP and prepend it to the argument list */
511 static void
512 prepend_gzip(char *gzip, int *argc, char ***argv)
513 {
514 	char *s, **nargv, **ac;
515 	int nenvarg = 0, i;
516 
517 	/* scan how many arguments there are */
518 	for (s = gzip;;) {
519 		while (*s == ' ' || *s == '\t')
520 			s++;
521 		if (*s == 0)
522 			goto count_done;
523 		nenvarg++;
524 		while (*s != ' ' && *s != '\t')
525 			if (*s++ == 0)
526 				goto count_done;
527 	}
528 count_done:
529 	/* punt early */
530 	if (nenvarg == 0)
531 		return;
532 
533 	*argc += nenvarg;
534 	ac = *argv;
535 
536 	nargv = (char **)malloc((*argc + 1) * sizeof(char *));
537 	if (nargv == NULL)
538 		maybe_err("malloc");
539 
540 	/* stash this away */
541 	*argv = nargv;
542 
543 	/* copy the program name first */
544 	i = 0;
545 	nargv[i++] = *(ac++);
546 
547 	/* take a copy of $GZIP and add it to the array */
548 	s = strdup(gzip);
549 	if (s == NULL)
550 		maybe_err("strdup");
551 	for (;;) {
552 		/* Skip whitespaces. */
553 		while (*s == ' ' || *s == '\t')
554 			s++;
555 		if (*s == 0)
556 			goto copy_done;
557 		nargv[i++] = s;
558 		/* Find the end of this argument. */
559 		while (*s != ' ' && *s != '\t')
560 			if (*s++ == 0)
561 				/* Argument followed by NUL. */
562 				goto copy_done;
563 		/* Terminate by overwriting ' ' or '\t' with NUL. */
564 		*s++ = 0;
565 	}
566 copy_done:
567 
568 	/* copy the original arguments and a NULL */
569 	while (*ac)
570 		nargv[i++] = *(ac++);
571 	nargv[i] = NULL;
572 }
573 #endif
574 
575 /* compress input to output. Return bytes read, -1 on error */
576 static off_t
577 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
578 {
579 	z_stream z;
580 	char *outbufp, *inbufp;
581 	off_t in_tot = 0, out_tot = 0;
582 	ssize_t in_size;
583 	int i, error;
584 	uLong crc;
585 #ifdef SMALL
586 	static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0,
587 				 0, 0, 0, 0,
588 				 0, OS_CODE };
589 #endif
590 
591 	outbufp = malloc(BUFLEN);
592 	inbufp = malloc(BUFLEN);
593 	if (outbufp == NULL || inbufp == NULL) {
594 		maybe_err("malloc failed");
595 		goto out;
596 	}
597 
598 	memset(&z, 0, sizeof z);
599 	z.zalloc = Z_NULL;
600 	z.zfree = Z_NULL;
601 	z.opaque = 0;
602 
603 #ifdef SMALL
604 	memcpy(outbufp, header, sizeof header);
605 	i = sizeof header;
606 #else
607 	if (nflag != 0) {
608 		mtime = 0;
609 		origname = "";
610 	}
611 
612 	i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
613 		     GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
614 		     *origname ? ORIG_NAME : 0,
615 		     mtime & 0xff,
616 		     (mtime >> 8) & 0xff,
617 		     (mtime >> 16) & 0xff,
618 		     (mtime >> 24) & 0xff,
619 		     numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
620 		     OS_CODE, origname);
621 	if (i >= BUFLEN)
622 		/* this need PATH_MAX > BUFLEN ... */
623 		maybe_err("snprintf");
624 	if (*origname)
625 		i++;
626 #endif
627 
628 	z.next_out = (unsigned char *)outbufp + i;
629 	z.avail_out = BUFLEN - i;
630 
631 	error = deflateInit2(&z, numflag, Z_DEFLATED,
632 			     (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY);
633 	if (error != Z_OK) {
634 		maybe_warnx("deflateInit2 failed");
635 		in_tot = -1;
636 		goto out;
637 	}
638 
639 	crc = crc32(0L, Z_NULL, 0);
640 	for (;;) {
641 		if (z.avail_out == 0) {
642 			if (write_retry(out, outbufp, BUFLEN) != BUFLEN) {
643 				maybe_warn("write");
644 				out_tot = -1;
645 				goto out;
646 			}
647 
648 			out_tot += BUFLEN;
649 			z.next_out = (unsigned char *)outbufp;
650 			z.avail_out = BUFLEN;
651 		}
652 
653 		if (z.avail_in == 0) {
654 			in_size = read(in, inbufp, BUFLEN);
655 			if (in_size < 0) {
656 				maybe_warn("read");
657 				in_tot = -1;
658 				goto out;
659 			}
660 			if (in_size == 0)
661 				break;
662 			infile_newdata(in_size);
663 
664 			crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
665 			in_tot += in_size;
666 			z.next_in = (unsigned char *)inbufp;
667 			z.avail_in = in_size;
668 		}
669 
670 		error = deflate(&z, Z_NO_FLUSH);
671 		if (error != Z_OK && error != Z_STREAM_END) {
672 			maybe_warnx("deflate failed");
673 			in_tot = -1;
674 			goto out;
675 		}
676 	}
677 
678 	/* clean up */
679 	for (;;) {
680 		size_t len;
681 		ssize_t w;
682 
683 		error = deflate(&z, Z_FINISH);
684 		if (error != Z_OK && error != Z_STREAM_END) {
685 			maybe_warnx("deflate failed");
686 			in_tot = -1;
687 			goto out;
688 		}
689 
690 		len = (char *)z.next_out - outbufp;
691 
692 		w = write_retry(out, outbufp, len);
693 		if (w == -1 || (size_t)w != len) {
694 			maybe_warn("write");
695 			out_tot = -1;
696 			goto out;
697 		}
698 		out_tot += len;
699 		z.next_out = (unsigned char *)outbufp;
700 		z.avail_out = BUFLEN;
701 
702 		if (error == Z_STREAM_END)
703 			break;
704 	}
705 
706 	if (deflateEnd(&z) != Z_OK) {
707 		maybe_warnx("deflateEnd failed");
708 		in_tot = -1;
709 		goto out;
710 	}
711 
712 	i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
713 		 (int)crc & 0xff,
714 		 (int)(crc >> 8) & 0xff,
715 		 (int)(crc >> 16) & 0xff,
716 		 (int)(crc >> 24) & 0xff,
717 		 (int)in_tot & 0xff,
718 		 (int)(in_tot >> 8) & 0xff,
719 		 (int)(in_tot >> 16) & 0xff,
720 		 (int)(in_tot >> 24) & 0xff);
721 	if (i != 8)
722 		maybe_err("snprintf");
723 	if (write_retry(out, outbufp, i) != i) {
724 		maybe_warn("write");
725 		in_tot = -1;
726 	} else
727 		out_tot += i;
728 
729 out:
730 	if (inbufp != NULL)
731 		free(inbufp);
732 	if (outbufp != NULL)
733 		free(outbufp);
734 	if (gsizep)
735 		*gsizep = out_tot;
736 	return in_tot;
737 }
738 
739 /*
740  * uncompress input to output then close the input.  return the
741  * uncompressed size written, and put the compressed sized read
742  * into `*gsizep'.
743  */
744 static off_t
745 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
746 	      const char *filename)
747 {
748 	z_stream z;
749 	char *outbufp, *inbufp;
750 	off_t out_tot = -1, in_tot = 0;
751 	uint32_t out_sub_tot = 0;
752 	enum {
753 		GZSTATE_MAGIC0,
754 		GZSTATE_MAGIC1,
755 		GZSTATE_METHOD,
756 		GZSTATE_FLAGS,
757 		GZSTATE_SKIPPING,
758 		GZSTATE_EXTRA,
759 		GZSTATE_EXTRA2,
760 		GZSTATE_EXTRA3,
761 		GZSTATE_ORIGNAME,
762 		GZSTATE_COMMENT,
763 		GZSTATE_HEAD_CRC1,
764 		GZSTATE_HEAD_CRC2,
765 		GZSTATE_INIT,
766 		GZSTATE_READ,
767 		GZSTATE_CRC,
768 		GZSTATE_LEN,
769 	} state = GZSTATE_MAGIC0;
770 	int flags = 0, skip_count = 0;
771 	int error = Z_STREAM_ERROR, done_reading = 0;
772 	uLong crc = 0;
773 	ssize_t wr;
774 	int needmore = 0;
775 
776 #define ADVANCE()       { z.next_in++; z.avail_in--; }
777 
778 	if ((outbufp = malloc(BUFLEN)) == NULL) {
779 		maybe_err("malloc failed");
780 		goto out2;
781 	}
782 	if ((inbufp = malloc(BUFLEN)) == NULL) {
783 		maybe_err("malloc failed");
784 		goto out1;
785 	}
786 
787 	memset(&z, 0, sizeof z);
788 	z.avail_in = prelen;
789 	z.next_in = (unsigned char *)pre;
790 	z.avail_out = BUFLEN;
791 	z.next_out = (unsigned char *)outbufp;
792 	z.zalloc = NULL;
793 	z.zfree = NULL;
794 	z.opaque = 0;
795 
796 	in_tot = prelen;
797 	out_tot = 0;
798 
799 	for (;;) {
800 		check_siginfo();
801 		if ((z.avail_in == 0 || needmore) && done_reading == 0) {
802 			ssize_t in_size;
803 
804 			if (z.avail_in > 0) {
805 				memmove(inbufp, z.next_in, z.avail_in);
806 			}
807 			z.next_in = (unsigned char *)inbufp;
808 			in_size = read(in, z.next_in + z.avail_in,
809 			    BUFLEN - z.avail_in);
810 
811 			if (in_size == -1) {
812 				maybe_warn("failed to read stdin");
813 				goto stop_and_fail;
814 			} else if (in_size == 0) {
815 				done_reading = 1;
816 			}
817 			infile_newdata(in_size);
818 
819 			z.avail_in += in_size;
820 			needmore = 0;
821 
822 			in_tot += in_size;
823 		}
824 		if (z.avail_in == 0) {
825 			if (done_reading && state != GZSTATE_MAGIC0) {
826 				maybe_warnx("%s: unexpected end of file",
827 					    filename);
828 				goto stop_and_fail;
829 			}
830 			goto stop;
831 		}
832 		switch (state) {
833 		case GZSTATE_MAGIC0:
834 			if (*z.next_in != GZIP_MAGIC0) {
835 				if (in_tot > 0) {
836 					maybe_warnx("%s: trailing garbage "
837 						    "ignored", filename);
838 					exit_value = 2;
839 					goto stop;
840 				}
841 				maybe_warnx("input not gziped (MAGIC0)");
842 				goto stop_and_fail;
843 			}
844 			ADVANCE();
845 			state++;
846 			out_sub_tot = 0;
847 			crc = crc32(0L, Z_NULL, 0);
848 			break;
849 
850 		case GZSTATE_MAGIC1:
851 			if (*z.next_in != GZIP_MAGIC1 &&
852 			    *z.next_in != GZIP_OMAGIC1) {
853 				maybe_warnx("input not gziped (MAGIC1)");
854 				goto stop_and_fail;
855 			}
856 			ADVANCE();
857 			state++;
858 			break;
859 
860 		case GZSTATE_METHOD:
861 			if (*z.next_in != Z_DEFLATED) {
862 				maybe_warnx("unknown compression method");
863 				goto stop_and_fail;
864 			}
865 			ADVANCE();
866 			state++;
867 			break;
868 
869 		case GZSTATE_FLAGS:
870 			flags = *z.next_in;
871 			ADVANCE();
872 			skip_count = 6;
873 			state++;
874 			break;
875 
876 		case GZSTATE_SKIPPING:
877 			if (skip_count > 0) {
878 				skip_count--;
879 				ADVANCE();
880 			} else
881 				state++;
882 			break;
883 
884 		case GZSTATE_EXTRA:
885 			if ((flags & EXTRA_FIELD) == 0) {
886 				state = GZSTATE_ORIGNAME;
887 				break;
888 			}
889 			skip_count = *z.next_in;
890 			ADVANCE();
891 			state++;
892 			break;
893 
894 		case GZSTATE_EXTRA2:
895 			skip_count |= ((*z.next_in) << 8);
896 			ADVANCE();
897 			state++;
898 			break;
899 
900 		case GZSTATE_EXTRA3:
901 			if (skip_count > 0) {
902 				skip_count--;
903 				ADVANCE();
904 			} else
905 				state++;
906 			break;
907 
908 		case GZSTATE_ORIGNAME:
909 			if ((flags & ORIG_NAME) == 0) {
910 				state++;
911 				break;
912 			}
913 			if (*z.next_in == 0)
914 				state++;
915 			ADVANCE();
916 			break;
917 
918 		case GZSTATE_COMMENT:
919 			if ((flags & COMMENT) == 0) {
920 				state++;
921 				break;
922 			}
923 			if (*z.next_in == 0)
924 				state++;
925 			ADVANCE();
926 			break;
927 
928 		case GZSTATE_HEAD_CRC1:
929 			if (flags & HEAD_CRC)
930 				skip_count = 2;
931 			else
932 				skip_count = 0;
933 			state++;
934 			break;
935 
936 		case GZSTATE_HEAD_CRC2:
937 			if (skip_count > 0) {
938 				skip_count--;
939 				ADVANCE();
940 			} else
941 				state++;
942 			break;
943 
944 		case GZSTATE_INIT:
945 			if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
946 				maybe_warnx("failed to inflateInit");
947 				goto stop_and_fail;
948 			}
949 			state++;
950 			break;
951 
952 		case GZSTATE_READ:
953 			error = inflate(&z, Z_FINISH);
954 			switch (error) {
955 			/* Z_BUF_ERROR goes with Z_FINISH... */
956 			case Z_BUF_ERROR:
957 				if (z.avail_out > 0 && !done_reading)
958 					continue;
959 
960 			case Z_STREAM_END:
961 			case Z_OK:
962 				break;
963 
964 			case Z_NEED_DICT:
965 				maybe_warnx("Z_NEED_DICT error");
966 				goto stop_and_fail;
967 			case Z_DATA_ERROR:
968 				maybe_warnx("data stream error");
969 				goto stop_and_fail;
970 			case Z_STREAM_ERROR:
971 				maybe_warnx("internal stream error");
972 				goto stop_and_fail;
973 			case Z_MEM_ERROR:
974 				maybe_warnx("memory allocation error");
975 				goto stop_and_fail;
976 
977 			default:
978 				maybe_warn("unknown error from inflate(): %d",
979 				    error);
980 			}
981 			wr = BUFLEN - z.avail_out;
982 
983 			if (wr != 0) {
984 				crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
985 				if (
986 #ifndef SMALL
987 				    /* don't write anything with -t */
988 				    tflag == 0 &&
989 #endif
990 				    write_retry(out, outbufp, wr) != wr) {
991 					maybe_warn("error writing to output");
992 					goto stop_and_fail;
993 				}
994 
995 				out_tot += wr;
996 				out_sub_tot += wr;
997 			}
998 
999 			if (error == Z_STREAM_END) {
1000 				inflateEnd(&z);
1001 				state++;
1002 			}
1003 
1004 			z.next_out = (unsigned char *)outbufp;
1005 			z.avail_out = BUFLEN;
1006 
1007 			break;
1008 		case GZSTATE_CRC:
1009 			{
1010 				uLong origcrc;
1011 
1012 				if (z.avail_in < 4) {
1013 					if (!done_reading) {
1014 						needmore = 1;
1015 						continue;
1016 					}
1017 					maybe_warnx("truncated input");
1018 					goto stop_and_fail;
1019 				}
1020 				origcrc = le32dec(&z.next_in[0]);
1021 				if (origcrc != crc) {
1022 					maybe_warnx("invalid compressed"
1023 					     " data--crc error");
1024 					goto stop_and_fail;
1025 				}
1026 			}
1027 
1028 			z.avail_in -= 4;
1029 			z.next_in += 4;
1030 
1031 			if (!z.avail_in && done_reading) {
1032 				goto stop;
1033 			}
1034 			state++;
1035 			break;
1036 		case GZSTATE_LEN:
1037 			{
1038 				uLong origlen;
1039 
1040 				if (z.avail_in < 4) {
1041 					if (!done_reading) {
1042 						needmore = 1;
1043 						continue;
1044 					}
1045 					maybe_warnx("truncated input");
1046 					goto stop_and_fail;
1047 				}
1048 				origlen = le32dec(&z.next_in[0]);
1049 
1050 				if (origlen != out_sub_tot) {
1051 					maybe_warnx("invalid compressed"
1052 					     " data--length error");
1053 					goto stop_and_fail;
1054 				}
1055 			}
1056 
1057 			z.avail_in -= 4;
1058 			z.next_in += 4;
1059 
1060 			if (error < 0) {
1061 				maybe_warnx("decompression error");
1062 				goto stop_and_fail;
1063 			}
1064 			state = GZSTATE_MAGIC0;
1065 			break;
1066 		}
1067 		continue;
1068 stop_and_fail:
1069 		out_tot = -1;
1070 stop:
1071 		break;
1072 	}
1073 	if (state > GZSTATE_INIT)
1074 		inflateEnd(&z);
1075 
1076 	free(inbufp);
1077 out1:
1078 	free(outbufp);
1079 out2:
1080 	if (gsizep)
1081 		*gsizep = in_tot;
1082 	return (out_tot);
1083 }
1084 
1085 #ifndef SMALL
1086 /*
1087  * set the owner, mode, flags & utimes using the given file descriptor.
1088  * file is only used in possible warning messages.
1089  */
1090 static void
1091 copymodes(int fd, const struct stat *sbp, const char *file)
1092 {
1093 	struct timespec times[2];
1094 	struct stat sb;
1095 
1096 	/*
1097 	 * If we have no info on the input, give this file some
1098 	 * default values and return..
1099 	 */
1100 	if (sbp == NULL) {
1101 		mode_t mask = umask(022);
1102 
1103 		(void)fchmod(fd, DEFFILEMODE & ~mask);
1104 		(void)umask(mask);
1105 		return;
1106 	}
1107 	sb = *sbp;
1108 
1109 	/* if the chown fails, remove set-id bits as-per compress(1) */
1110 	if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
1111 		if (errno != EPERM)
1112 			maybe_warn("couldn't fchown: %s", file);
1113 		sb.st_mode &= ~(S_ISUID|S_ISGID);
1114 	}
1115 
1116 	/* we only allow set-id and the 9 normal permission bits */
1117 	sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1118 	if (fchmod(fd, sb.st_mode) < 0)
1119 		maybe_warn("couldn't fchmod: %s", file);
1120 
1121 	times[0] = sb.st_atim;
1122 	times[1] = sb.st_mtim;
1123 	if (futimens(fd, times) < 0)
1124 		maybe_warn("couldn't futimens: %s", file);
1125 
1126 	/* only try flags if they exist already */
1127         if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1128 		maybe_warn("couldn't fchflags: %s", file);
1129 }
1130 #endif
1131 
1132 /* what sort of file is this? */
1133 static enum filetype
1134 file_gettype(u_char *buf)
1135 {
1136 
1137 	if (buf[0] == GZIP_MAGIC0 &&
1138 	    (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1139 		return FT_GZIP;
1140 	else
1141 #ifndef NO_BZIP2_SUPPORT
1142 	if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1143 	    buf[3] >= '0' && buf[3] <= '9')
1144 		return FT_BZIP2;
1145 	else
1146 #endif
1147 #ifndef NO_COMPRESS_SUPPORT
1148 	if (memcmp(buf, Z_MAGIC, 2) == 0)
1149 		return FT_Z;
1150 	else
1151 #endif
1152 #ifndef NO_PACK_SUPPORT
1153 	if (memcmp(buf, PACK_MAGIC, 2) == 0)
1154 		return FT_PACK;
1155 	else
1156 #endif
1157 #ifndef NO_XZ_SUPPORT
1158 	if (memcmp(buf, XZ_MAGIC, 4) == 0)	/* XXX: We only have 4 bytes */
1159 		return FT_XZ;
1160 	else
1161 #endif
1162 		return FT_UNKNOWN;
1163 }
1164 
1165 #ifndef SMALL
1166 /* check the outfile is OK. */
1167 static int
1168 check_outfile(const char *outfile)
1169 {
1170 	struct stat sb;
1171 	int ok = 1;
1172 
1173 	if (lflag == 0 && stat(outfile, &sb) == 0) {
1174 		if (fflag)
1175 			unlink(outfile);
1176 		else if (isatty(STDIN_FILENO)) {
1177 			char ans[10] = { 'n', '\0' };	/* default */
1178 
1179 			fprintf(stderr, "%s already exists -- do you wish to "
1180 					"overwrite (y or n)? " , outfile);
1181 			(void)fgets(ans, sizeof(ans) - 1, stdin);
1182 			if (ans[0] != 'y' && ans[0] != 'Y') {
1183 				fprintf(stderr, "\tnot overwriting\n");
1184 				ok = 0;
1185 			} else
1186 				unlink(outfile);
1187 		} else {
1188 			maybe_warnx("%s already exists -- skipping", outfile);
1189 			ok = 0;
1190 		}
1191 	}
1192 	return ok;
1193 }
1194 
1195 static void
1196 unlink_input(const char *file, const struct stat *sb)
1197 {
1198 	struct stat nsb;
1199 
1200 	if (kflag)
1201 		return;
1202 	if (stat(file, &nsb) != 0)
1203 		/* Must be gone already */
1204 		return;
1205 	if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1206 		/* Definitely a different file */
1207 		return;
1208 	unlink(file);
1209 }
1210 
1211 static void
1212 got_sigint(int signo __unused)
1213 {
1214 
1215 	if (remove_file != NULL)
1216 		unlink(remove_file);
1217 	_exit(2);
1218 }
1219 
1220 static void
1221 got_siginfo(int signo __unused)
1222 {
1223 
1224 	print_info = 1;
1225 }
1226 
1227 static void
1228 setup_signals(void)
1229 {
1230 
1231 	signal(SIGINFO, got_siginfo);
1232 	signal(SIGINT, got_sigint);
1233 }
1234 
1235 static	void
1236 infile_newdata(size_t newdata)
1237 {
1238 
1239 	infile_current += newdata;
1240 }
1241 #endif
1242 
1243 static	void
1244 infile_set(const char *newinfile, off_t total)
1245 {
1246 
1247 	if (newinfile)
1248 		infile = newinfile;
1249 #ifndef SMALL
1250 	infile_total = total;
1251 #endif
1252 }
1253 
1254 static	void
1255 infile_clear(void)
1256 {
1257 
1258 	infile = NULL;
1259 #ifndef SMALL
1260 	infile_total = infile_current = 0;
1261 #endif
1262 }
1263 
1264 static const suffixes_t *
1265 check_suffix(char *file, int xlate)
1266 {
1267 	const suffixes_t *s;
1268 	int len = strlen(file);
1269 	char *sp;
1270 
1271 	for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1272 		/* if it doesn't fit in "a.suf", don't bother */
1273 		if (s->ziplen >= len)
1274 			continue;
1275 		sp = file + len - s->ziplen;
1276 		if (strcmp(s->zipped, sp) != 0)
1277 			continue;
1278 		if (xlate)
1279 			strcpy(sp, s->normal);
1280 		return s;
1281 	}
1282 	return NULL;
1283 }
1284 
1285 /*
1286  * compress the given file: create a corresponding .gz file and remove the
1287  * original.
1288  */
1289 static off_t
1290 file_compress(char *file, char *outfile, size_t outsize)
1291 {
1292 	int in;
1293 	int out;
1294 	off_t size, in_size;
1295 #ifndef SMALL
1296 	struct stat isb, osb;
1297 	const suffixes_t *suff;
1298 #endif
1299 
1300 	in = open(file, O_RDONLY);
1301 	if (in == -1) {
1302 		maybe_warn("can't open %s", file);
1303 		return (-1);
1304 	}
1305 
1306 #ifndef SMALL
1307 	if (fstat(in, &isb) != 0) {
1308 		maybe_warn("couldn't stat: %s", file);
1309 		close(in);
1310 		return (-1);
1311 	}
1312 #endif
1313 
1314 #ifndef SMALL
1315 	if (fstat(in, &isb) != 0) {
1316 		close(in);
1317 		maybe_warn("can't stat %s", file);
1318 		return -1;
1319 	}
1320 	infile_set(file, isb.st_size);
1321 #endif
1322 
1323 	if (cflag == 0) {
1324 #ifndef SMALL
1325 		if (isb.st_nlink > 1 && fflag == 0) {
1326 			maybe_warnx("%s has %ju other link%s -- "
1327 				    "skipping", file,
1328 				    (uintmax_t)isb.st_nlink - 1,
1329 				    isb.st_nlink == 1 ? "" : "s");
1330 			close(in);
1331 			return -1;
1332 		}
1333 
1334 		if (fflag == 0 && (suff = check_suffix(file, 0)) &&
1335 		    suff->zipped[0] != 0) {
1336 			maybe_warnx("%s already has %s suffix -- unchanged",
1337 			    file, suff->zipped);
1338 			close(in);
1339 			return (-1);
1340 		}
1341 #endif
1342 
1343 		/* Add (usually) .gz to filename */
1344 		if ((size_t)snprintf(outfile, outsize, "%s%s",
1345 		    file, suffixes[0].zipped) >= outsize)
1346 			memcpy(outfile + outsize - suffixes[0].ziplen - 1,
1347 			    suffixes[0].zipped, suffixes[0].ziplen + 1);
1348 
1349 #ifndef SMALL
1350 		if (check_outfile(outfile) == 0) {
1351 			close(in);
1352 			return (-1);
1353 		}
1354 #endif
1355 	}
1356 
1357 	if (cflag == 0) {
1358 		out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1359 		if (out == -1) {
1360 			maybe_warn("could not create output: %s", outfile);
1361 			fclose(stdin);
1362 			return (-1);
1363 		}
1364 #ifndef SMALL
1365 		remove_file = outfile;
1366 #endif
1367 	} else
1368 		out = STDOUT_FILENO;
1369 
1370 	in_size = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1371 
1372 	(void)close(in);
1373 
1374 	/*
1375 	 * If there was an error, in_size will be -1.
1376 	 * If we compressed to stdout, just return the size.
1377 	 * Otherwise stat the file and check it is the correct size.
1378 	 * We only blow away the file if we can stat the output and it
1379 	 * has the expected size.
1380 	 */
1381 	if (cflag != 0)
1382 		return in_size == -1 ? -1 : size;
1383 
1384 #ifndef SMALL
1385 	if (fstat(out, &osb) != 0) {
1386 		maybe_warn("couldn't stat: %s", outfile);
1387 		goto bad_outfile;
1388 	}
1389 
1390 	if (osb.st_size != size) {
1391 		maybe_warnx("output file: %s wrong size (%ju != %ju), deleting",
1392 		    outfile, (uintmax_t)osb.st_size, (uintmax_t)size);
1393 		goto bad_outfile;
1394 	}
1395 
1396 	copymodes(out, &isb, outfile);
1397 	remove_file = NULL;
1398 #endif
1399 	if (close(out) == -1)
1400 		maybe_warn("couldn't close output");
1401 
1402 	/* output is good, ok to delete input */
1403 	unlink_input(file, &isb);
1404 	return (size);
1405 
1406 #ifndef SMALL
1407     bad_outfile:
1408 	if (close(out) == -1)
1409 		maybe_warn("couldn't close output");
1410 
1411 	maybe_warnx("leaving original %s", file);
1412 	unlink(outfile);
1413 	return (size);
1414 #endif
1415 }
1416 
1417 /* uncompress the given file and remove the original */
1418 static off_t
1419 file_uncompress(char *file, char *outfile, size_t outsize)
1420 {
1421 	struct stat isb, osb;
1422 	off_t size;
1423 	ssize_t rbytes;
1424 	unsigned char header1[4];
1425 	enum filetype method;
1426 	int fd, ofd, zfd = -1;
1427 	int error;
1428 	size_t in_size;
1429 #ifndef SMALL
1430 	ssize_t rv;
1431 	time_t timestamp = 0;
1432 	char name[PATH_MAX + 1];
1433 #endif
1434 
1435 	/* gather the old name info */
1436 
1437 	fd = open(file, O_RDONLY);
1438 	if (fd < 0) {
1439 		maybe_warn("can't open %s", file);
1440 		goto lose;
1441 	}
1442 	if (fstat(fd, &isb) != 0) {
1443 		maybe_warn("can't stat %s", file);
1444 		goto lose;
1445 	}
1446 	if (S_ISREG(isb.st_mode))
1447 		in_size = isb.st_size;
1448 	else
1449 		in_size = 0;
1450 	infile_set(file, in_size);
1451 
1452 	strlcpy(outfile, file, outsize);
1453 	if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1454 		maybe_warnx("%s: unknown suffix -- ignored", file);
1455 		goto lose;
1456 	}
1457 
1458 	rbytes = read(fd, header1, sizeof header1);
1459 	if (rbytes != sizeof header1) {
1460 		/* we don't want to fail here. */
1461 #ifndef SMALL
1462 		if (fflag)
1463 			goto lose;
1464 #endif
1465 		if (rbytes == -1)
1466 			maybe_warn("can't read %s", file);
1467 		else
1468 			goto unexpected_EOF;
1469 		goto lose;
1470 	}
1471 	infile_newdata(rbytes);
1472 
1473 	method = file_gettype(header1);
1474 #ifndef SMALL
1475 	if (fflag == 0 && method == FT_UNKNOWN) {
1476 		maybe_warnx("%s: not in gzip format", file);
1477 		goto lose;
1478 	}
1479 
1480 #endif
1481 
1482 #ifndef SMALL
1483 	if (method == FT_GZIP && Nflag) {
1484 		unsigned char ts[4];	/* timestamp */
1485 
1486 		rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1487 		if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1488 			goto unexpected_EOF;
1489 		if (rv == -1) {
1490 			if (!fflag)
1491 				maybe_warn("can't read %s", file);
1492 			goto lose;
1493 		}
1494 		infile_newdata(rv);
1495 		timestamp = le32dec(&ts[0]);
1496 
1497 		if (header1[3] & ORIG_NAME) {
1498 			rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME);
1499 			if (rbytes < 0) {
1500 				maybe_warn("can't read %s", file);
1501 				goto lose;
1502 			}
1503 			if (name[0] != '\0') {
1504 				char *dp, *nf;
1505 
1506 				/* Make sure that name is NUL-terminated */
1507 				name[rbytes] = '\0';
1508 
1509 				/* strip saved directory name */
1510 				nf = strrchr(name, '/');
1511 				if (nf == NULL)
1512 					nf = name;
1513 				else
1514 					nf++;
1515 
1516 				/* preserve original directory name */
1517 				dp = strrchr(file, '/');
1518 				if (dp == NULL)
1519 					dp = file;
1520 				else
1521 					dp++;
1522 				snprintf(outfile, outsize, "%.*s%.*s",
1523 						(int) (dp - file),
1524 						file, (int) rbytes, nf);
1525 			}
1526 		}
1527 	}
1528 #endif
1529 	lseek(fd, 0, SEEK_SET);
1530 
1531 	if (cflag == 0 || lflag) {
1532 #ifndef SMALL
1533 		if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1534 			maybe_warnx("%s has %ju other links -- skipping",
1535 			    file, (uintmax_t)isb.st_nlink - 1);
1536 			goto lose;
1537 		}
1538 		if (nflag == 0 && timestamp)
1539 			isb.st_mtime = timestamp;
1540 		if (check_outfile(outfile) == 0)
1541 			goto lose;
1542 #endif
1543 	}
1544 
1545 	if (cflag)
1546 		zfd = STDOUT_FILENO;
1547 	else if (lflag)
1548 		zfd = -1;
1549 	else {
1550 		zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1551 		if (zfd == STDOUT_FILENO) {
1552 			/* We won't close STDOUT_FILENO later... */
1553 			zfd = dup(zfd);
1554 			close(STDOUT_FILENO);
1555 		}
1556 		if (zfd == -1) {
1557 			maybe_warn("can't open %s", outfile);
1558 			goto lose;
1559 		}
1560 		remove_file = outfile;
1561 	}
1562 
1563 	switch (method) {
1564 #ifndef NO_BZIP2_SUPPORT
1565 	case FT_BZIP2:
1566 		/* XXX */
1567 		if (lflag) {
1568 			maybe_warnx("no -l with bzip2 files");
1569 			goto lose;
1570 		}
1571 
1572 		size = unbzip2(fd, zfd, NULL, 0, NULL);
1573 		break;
1574 #endif
1575 
1576 #ifndef NO_COMPRESS_SUPPORT
1577 	case FT_Z: {
1578 		FILE *in, *out;
1579 
1580 		/* XXX */
1581 		if (lflag) {
1582 			maybe_warnx("no -l with Lempel-Ziv files");
1583 			goto lose;
1584 		}
1585 
1586 		if ((in = zdopen(fd)) == NULL) {
1587 			maybe_warn("zdopen for read: %s", file);
1588 			goto lose;
1589 		}
1590 
1591 		out = fdopen(dup(zfd), "w");
1592 		if (out == NULL) {
1593 			maybe_warn("fdopen for write: %s", outfile);
1594 			fclose(in);
1595 			goto lose;
1596 		}
1597 
1598 		size = zuncompress(in, out, NULL, 0, NULL);
1599 		/* need to fclose() if ferror() is true... */
1600 		error = ferror(in);
1601 		if (error | fclose(in)) {
1602 			if (error)
1603 				maybe_warn("failed infile");
1604 			else
1605 				maybe_warn("failed infile fclose");
1606 			if (cflag == 0)
1607 				unlink(outfile);
1608 			(void)fclose(out);
1609 			goto lose;
1610 		}
1611 		if (fclose(out) != 0) {
1612 			maybe_warn("failed outfile fclose");
1613 			if (cflag == 0)
1614 				unlink(outfile);
1615 			goto lose;
1616 		}
1617 		break;
1618 	}
1619 #endif
1620 
1621 #ifndef NO_PACK_SUPPORT
1622 	case FT_PACK:
1623 		if (lflag) {
1624 			maybe_warnx("no -l with packed files");
1625 			goto lose;
1626 		}
1627 
1628 		size = unpack(fd, zfd, NULL, 0, NULL);
1629 		break;
1630 #endif
1631 
1632 #ifndef NO_XZ_SUPPORT
1633 	case FT_XZ:
1634 		if (lflag) {
1635 			maybe_warnx("no -l with xz files");
1636 			goto lose;
1637 		}
1638 
1639 		size = unxz(fd, zfd, NULL, 0, NULL);
1640 		break;
1641 #endif
1642 
1643 #ifndef SMALL
1644 	case FT_UNKNOWN:
1645 		if (lflag) {
1646 			maybe_warnx("no -l for unknown filetypes");
1647 			goto lose;
1648 		}
1649 		size = cat_fd(NULL, 0, NULL, fd);
1650 		break;
1651 #endif
1652 	default:
1653 		if (lflag) {
1654 			print_list(fd, in_size, outfile, isb.st_mtime);
1655 			close(fd);
1656 			return -1;	/* XXX */
1657 		}
1658 
1659 		size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1660 		break;
1661 	}
1662 
1663 	if (close(fd) != 0)
1664 		maybe_warn("couldn't close input");
1665 	if (zfd != STDOUT_FILENO && close(zfd) != 0)
1666 		maybe_warn("couldn't close output");
1667 
1668 	if (size == -1) {
1669 		if (cflag == 0)
1670 			unlink(outfile);
1671 		maybe_warnx("%s: uncompress failed", file);
1672 		return -1;
1673 	}
1674 
1675 	/* if testing, or we uncompressed to stdout, this is all we need */
1676 #ifndef SMALL
1677 	if (tflag)
1678 		return size;
1679 #endif
1680 	/* if we are uncompressing to stdin, don't remove the file. */
1681 	if (cflag)
1682 		return size;
1683 
1684 	/*
1685 	 * if we create a file...
1686 	 */
1687 	/*
1688 	 * if we can't stat the file don't remove the file.
1689 	 */
1690 
1691 	ofd = open(outfile, O_RDWR, 0);
1692 	if (ofd == -1) {
1693 		maybe_warn("couldn't open (leaving original): %s",
1694 			   outfile);
1695 		return -1;
1696 	}
1697 	if (fstat(ofd, &osb) != 0) {
1698 		maybe_warn("couldn't stat (leaving original): %s",
1699 			   outfile);
1700 		close(ofd);
1701 		return -1;
1702 	}
1703 	if (osb.st_size != size) {
1704 		maybe_warnx("stat gave different size: %ju != %ju (leaving original)",
1705 		    (uintmax_t)size, (uintmax_t)osb.st_size);
1706 		close(ofd);
1707 		unlink(outfile);
1708 		return -1;
1709 	}
1710 #ifndef SMALL
1711 	copymodes(ofd, &isb, outfile);
1712 	remove_file = NULL;
1713 #endif
1714 	close(ofd);
1715 	unlink_input(file, &isb);
1716 	return size;
1717 
1718     unexpected_EOF:
1719 	maybe_warnx("%s: unexpected end of file", file);
1720     lose:
1721 	if (fd != -1)
1722 		close(fd);
1723 	if (zfd != -1 && zfd != STDOUT_FILENO)
1724 		close(zfd);
1725 	return -1;
1726 }
1727 
1728 #ifndef SMALL
1729 static void
1730 check_siginfo(void)
1731 {
1732 	if (print_info == 0)
1733 		return;
1734 	if (infile) {
1735 		if (infile_total) {
1736 			int pcent = (int)((100.0 * infile_current) / infile_total);
1737 
1738 			fprintf(stderr, "%s: done %llu/%llu bytes %d%%\n",
1739 				infile, (unsigned long long)infile_current,
1740 				(unsigned long long)infile_total, pcent);
1741 		} else
1742 			fprintf(stderr, "%s: done %llu bytes\n",
1743 				infile, (unsigned long long)infile_current);
1744 	}
1745 	print_info = 0;
1746 }
1747 
1748 static off_t
1749 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1750 {
1751 	char buf[BUFLEN];
1752 	off_t in_tot;
1753 	ssize_t w;
1754 
1755 	in_tot = count;
1756 	w = write_retry(STDOUT_FILENO, prepend, count);
1757 	if (w == -1 || (size_t)w != count) {
1758 		maybe_warn("write to stdout");
1759 		return -1;
1760 	}
1761 	for (;;) {
1762 		ssize_t rv;
1763 
1764 		rv = read(fd, buf, sizeof buf);
1765 		if (rv == 0)
1766 			break;
1767 		if (rv < 0) {
1768 			maybe_warn("read from fd %d", fd);
1769 			break;
1770 		}
1771 		infile_newdata(rv);
1772 
1773 		if (write_retry(STDOUT_FILENO, buf, rv) != rv) {
1774 			maybe_warn("write to stdout");
1775 			break;
1776 		}
1777 		in_tot += rv;
1778 	}
1779 
1780 	if (gsizep)
1781 		*gsizep = in_tot;
1782 	return (in_tot);
1783 }
1784 #endif
1785 
1786 static void
1787 handle_stdin(void)
1788 {
1789 	struct stat isb;
1790 	unsigned char header1[4];
1791 	size_t in_size;
1792 	off_t usize, gsize;
1793 	enum filetype method;
1794 	ssize_t bytes_read;
1795 #ifndef NO_COMPRESS_SUPPORT
1796 	FILE *in;
1797 #endif
1798 
1799 #ifndef SMALL
1800 	if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1801 		maybe_warnx("standard input is a terminal -- ignoring");
1802 		goto out;
1803 	}
1804 #endif
1805 
1806 	if (fstat(STDIN_FILENO, &isb) < 0) {
1807 		maybe_warn("fstat");
1808 		goto out;
1809 	}
1810 	if (S_ISREG(isb.st_mode))
1811 		in_size = isb.st_size;
1812 	else
1813 		in_size = 0;
1814 	infile_set("(stdin)", in_size);
1815 
1816 	if (lflag) {
1817 		print_list(STDIN_FILENO, in_size, infile, isb.st_mtime);
1818 		goto out;
1819 	}
1820 
1821 	bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
1822 	if (bytes_read == -1) {
1823 		maybe_warn("can't read stdin");
1824 		goto out;
1825 	} else if (bytes_read != sizeof(header1)) {
1826 		maybe_warnx("(stdin): unexpected end of file");
1827 		goto out;
1828 	}
1829 
1830 	method = file_gettype(header1);
1831 	switch (method) {
1832 	default:
1833 #ifndef SMALL
1834 		if (fflag == 0) {
1835 			maybe_warnx("unknown compression format");
1836 			goto out;
1837 		}
1838 		usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
1839 		break;
1840 #endif
1841 	case FT_GZIP:
1842 		usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1843 			      (char *)header1, sizeof header1, &gsize, "(stdin)");
1844 		break;
1845 #ifndef NO_BZIP2_SUPPORT
1846 	case FT_BZIP2:
1847 		usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1848 				(char *)header1, sizeof header1, &gsize);
1849 		break;
1850 #endif
1851 #ifndef NO_COMPRESS_SUPPORT
1852 	case FT_Z:
1853 		if ((in = zdopen(STDIN_FILENO)) == NULL) {
1854 			maybe_warnx("zopen of stdin");
1855 			goto out;
1856 		}
1857 
1858 		usize = zuncompress(in, stdout, (char *)header1,
1859 		    sizeof header1, &gsize);
1860 		fclose(in);
1861 		break;
1862 #endif
1863 #ifndef NO_PACK_SUPPORT
1864 	case FT_PACK:
1865 		usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1866 			       (char *)header1, sizeof header1, &gsize);
1867 		break;
1868 #endif
1869 #ifndef NO_XZ_SUPPORT
1870 	case FT_XZ:
1871 		usize = unxz(STDIN_FILENO, STDOUT_FILENO,
1872 			     (char *)header1, sizeof header1, &gsize);
1873 		break;
1874 #endif
1875 	}
1876 
1877 #ifndef SMALL
1878         if (vflag && !tflag && usize != -1 && gsize != -1)
1879 		print_verbage(NULL, NULL, usize, gsize);
1880 	if (vflag && tflag)
1881 		print_test("(stdin)", usize != -1);
1882 #else
1883 	(void)&usize;
1884 #endif
1885 
1886 out:
1887 	infile_clear();
1888 }
1889 
1890 static void
1891 handle_stdout(void)
1892 {
1893 	off_t gsize;
1894 #ifndef SMALL
1895 	off_t usize;
1896 	struct stat sb;
1897 	time_t systime;
1898 	uint32_t mtime;
1899 	int ret;
1900 
1901 	infile_set("(stdout)", 0);
1902 
1903 	if (fflag == 0 && isatty(STDOUT_FILENO)) {
1904 		maybe_warnx("standard output is a terminal -- ignoring");
1905 		return;
1906 	}
1907 
1908 	/* If stdin is a file use its mtime, otherwise use current time */
1909 	ret = fstat(STDIN_FILENO, &sb);
1910 	if (ret < 0) {
1911 		maybe_warn("Can't stat stdin");
1912 		return;
1913 	}
1914 
1915 	if (S_ISREG(sb.st_mode)) {
1916 		infile_set("(stdout)", sb.st_size);
1917 		mtime = (uint32_t)sb.st_mtime;
1918 	} else {
1919 		systime = time(NULL);
1920 		if (systime == -1) {
1921 			maybe_warn("time");
1922 			return;
1923 		}
1924 		mtime = (uint32_t)systime;
1925 	}
1926 
1927 	usize =
1928 #endif
1929 		gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1930 #ifndef SMALL
1931         if (vflag && !tflag && usize != -1 && gsize != -1)
1932 		print_verbage(NULL, NULL, usize, gsize);
1933 #endif
1934 }
1935 
1936 /* do what is asked for, for the path name */
1937 static void
1938 handle_pathname(char *path)
1939 {
1940 	char *opath = path, *s = NULL;
1941 	ssize_t len;
1942 	int slen;
1943 	struct stat sb;
1944 
1945 	/* check for stdout/stdin */
1946 	if (path[0] == '-' && path[1] == '\0') {
1947 		if (dflag)
1948 			handle_stdin();
1949 		else
1950 			handle_stdout();
1951 		return;
1952 	}
1953 
1954 retry:
1955 	if (stat(path, &sb) != 0 || (fflag == 0 && cflag == 0 &&
1956 	    lstat(path, &sb) != 0)) {
1957 		/* lets try <path>.gz if we're decompressing */
1958 		if (dflag && s == NULL && errno == ENOENT) {
1959 			len = strlen(path);
1960 			slen = suffixes[0].ziplen;
1961 			s = malloc(len + slen + 1);
1962 			if (s == NULL)
1963 				maybe_err("malloc");
1964 			memcpy(s, path, len);
1965 			memcpy(s + len, suffixes[0].zipped, slen + 1);
1966 			path = s;
1967 			goto retry;
1968 		}
1969 		maybe_warn("can't stat: %s", opath);
1970 		goto out;
1971 	}
1972 
1973 	if (S_ISDIR(sb.st_mode)) {
1974 #ifndef SMALL
1975 		if (rflag)
1976 			handle_dir(path);
1977 		else
1978 #endif
1979 			maybe_warnx("%s is a directory", path);
1980 		goto out;
1981 	}
1982 
1983 	if (S_ISREG(sb.st_mode))
1984 		handle_file(path, &sb);
1985 	else
1986 		maybe_warnx("%s is not a regular file", path);
1987 
1988 out:
1989 	if (s)
1990 		free(s);
1991 }
1992 
1993 /* compress/decompress a file */
1994 static void
1995 handle_file(char *file, struct stat *sbp)
1996 {
1997 	off_t usize, gsize;
1998 	char	outfile[PATH_MAX];
1999 
2000 	infile_set(file, sbp->st_size);
2001 	if (dflag) {
2002 		usize = file_uncompress(file, outfile, sizeof(outfile));
2003 #ifndef SMALL
2004 		if (vflag && tflag)
2005 			print_test(file, usize != -1);
2006 #endif
2007 		if (usize == -1)
2008 			return;
2009 		gsize = sbp->st_size;
2010 	} else {
2011 		gsize = file_compress(file, outfile, sizeof(outfile));
2012 		if (gsize == -1)
2013 			return;
2014 		usize = sbp->st_size;
2015 	}
2016 	infile_clear();
2017 
2018 #ifndef SMALL
2019 	if (vflag && !tflag)
2020 		print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
2021 #endif
2022 }
2023 
2024 #ifndef SMALL
2025 /* this is used with -r to recursively descend directories */
2026 static void
2027 handle_dir(char *dir)
2028 {
2029 	char *path_argv[2];
2030 	FTS *fts;
2031 	FTSENT *entry;
2032 
2033 	path_argv[0] = dir;
2034 	path_argv[1] = 0;
2035 	fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
2036 	if (fts == NULL) {
2037 		warn("couldn't fts_open %s", dir);
2038 		return;
2039 	}
2040 
2041 	while ((entry = fts_read(fts))) {
2042 		switch(entry->fts_info) {
2043 		case FTS_D:
2044 		case FTS_DP:
2045 			continue;
2046 
2047 		case FTS_DNR:
2048 		case FTS_ERR:
2049 		case FTS_NS:
2050 			maybe_warn("%s", entry->fts_path);
2051 			continue;
2052 		case FTS_F:
2053 			handle_file(entry->fts_path, entry->fts_statp);
2054 		}
2055 	}
2056 	(void)fts_close(fts);
2057 }
2058 #endif
2059 
2060 /* print a ratio - size reduction as a fraction of uncompressed size */
2061 static void
2062 print_ratio(off_t in, off_t out, FILE *where)
2063 {
2064 	int percent10;	/* 10 * percent */
2065 	off_t diff;
2066 	char buff[8];
2067 	int len;
2068 
2069 	diff = in - out/2;
2070 	if (in == 0 && out == 0)
2071 		percent10 = 0;
2072 	else if (diff < 0)
2073 		/*
2074 		 * Output is more than double size of input! print -99.9%
2075 		 * Quite possibly we've failed to get the original size.
2076 		 */
2077 		percent10 = -999;
2078 	else {
2079 		/*
2080 		 * We only need 12 bits of result from the final division,
2081 		 * so reduce the values until a 32bit division will suffice.
2082 		 */
2083 		while (in > 0x100000) {
2084 			diff >>= 1;
2085 			in >>= 1;
2086 		}
2087 		if (in != 0)
2088 			percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
2089 		else
2090 			percent10 = 0;
2091 	}
2092 
2093 	len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
2094 	/* Move the '.' to before the last digit */
2095 	buff[len - 1] = buff[len - 2];
2096 	buff[len - 2] = '.';
2097 	fprintf(where, "%5s%%", buff);
2098 }
2099 
2100 #ifndef SMALL
2101 /* print compression statistics, and the new name (if there is one!) */
2102 static void
2103 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
2104 {
2105 	if (file)
2106 		fprintf(stderr, "%s:%s  ", file,
2107 		    strlen(file) < 7 ? "\t\t" : "\t");
2108 	print_ratio(usize, gsize, stderr);
2109 	if (nfile)
2110 		fprintf(stderr, " -- replaced with %s", nfile);
2111 	fprintf(stderr, "\n");
2112 	fflush(stderr);
2113 }
2114 
2115 /* print test results */
2116 static void
2117 print_test(const char *file, int ok)
2118 {
2119 
2120 	if (exit_value == 0 && ok == 0)
2121 		exit_value = 1;
2122 	fprintf(stderr, "%s:%s  %s\n", file,
2123 	    strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
2124 	fflush(stderr);
2125 }
2126 #endif
2127 
2128 /* print a file's info ala --list */
2129 /* eg:
2130   compressed uncompressed  ratio uncompressed_name
2131       354841      1679360  78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
2132 */
2133 static void
2134 print_list(int fd, off_t out, const char *outfile, time_t ts)
2135 {
2136 	static int first = 1;
2137 #ifndef SMALL
2138 	static off_t in_tot, out_tot;
2139 	uint32_t crc = 0;
2140 #endif
2141 	off_t in = 0, rv;
2142 
2143 	if (first) {
2144 #ifndef SMALL
2145 		if (vflag)
2146 			printf("method  crc     date  time  ");
2147 #endif
2148 		if (qflag == 0)
2149 			printf("  compressed uncompressed  "
2150 			       "ratio uncompressed_name\n");
2151 	}
2152 	first = 0;
2153 
2154 	/* print totals? */
2155 #ifndef SMALL
2156 	if (fd == -1) {
2157 		in = in_tot;
2158 		out = out_tot;
2159 	} else
2160 #endif
2161 	{
2162 		/* read the last 4 bytes - this is the uncompressed size */
2163 		rv = lseek(fd, (off_t)(-8), SEEK_END);
2164 		if (rv != -1) {
2165 			unsigned char buf[8];
2166 			uint32_t usize;
2167 
2168 			rv = read(fd, (char *)buf, sizeof(buf));
2169 			if (rv == -1)
2170 				maybe_warn("read of uncompressed size");
2171 			else if (rv != sizeof(buf))
2172 				maybe_warnx("read of uncompressed size");
2173 
2174 			else {
2175 				usize = le32dec(&buf[4]);
2176 				in = (off_t)usize;
2177 #ifndef SMALL
2178 				crc = le32dec(&buf[0]);
2179 #endif
2180 			}
2181 		}
2182 	}
2183 
2184 #ifndef SMALL
2185 	if (vflag && fd == -1)
2186 		printf("                            ");
2187 	else if (vflag) {
2188 		char *date = ctime(&ts);
2189 
2190 		/* skip the day, 1/100th second, and year */
2191 		date += 4;
2192 		date[12] = 0;
2193 		printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
2194 	}
2195 	in_tot += in;
2196 	out_tot += out;
2197 #else
2198 	(void)&ts;	/* XXX */
2199 #endif
2200 	printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
2201 	print_ratio(in, out, stdout);
2202 	printf(" %s\n", outfile);
2203 }
2204 
2205 /* display the usage of NetBSD gzip */
2206 static void
2207 usage(void)
2208 {
2209 
2210 	fprintf(stderr, "%s\n", gzip_version);
2211 	fprintf(stderr,
2212 #ifdef SMALL
2213     "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n",
2214 #else
2215     "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
2216     " -1 --fast            fastest (worst) compression\n"
2217     " -2 .. -8             set compression level\n"
2218     " -9 --best            best (slowest) compression\n"
2219     " -c --stdout          write to stdout, keep original files\n"
2220     "    --to-stdout\n"
2221     " -d --decompress      uncompress files\n"
2222     "    --uncompress\n"
2223     " -f --force           force overwriting & compress links\n"
2224     " -h --help            display this help\n"
2225     " -k --keep            don't delete input files during operation\n"
2226     " -l --list            list compressed file contents\n"
2227     " -N --name            save or restore original file name and time stamp\n"
2228     " -n --no-name         don't save original file name or time stamp\n"
2229     " -q --quiet           output no warnings\n"
2230     " -r --recursive       recursively compress files in directories\n"
2231     " -S .suf              use suffix .suf instead of .gz\n"
2232     "    --suffix .suf\n"
2233     " -t --test            test compressed file\n"
2234     " -V --version         display program version\n"
2235     " -v --verbose         print extra statistics\n",
2236 #endif
2237 	    getprogname());
2238 	exit(0);
2239 }
2240 
2241 #ifndef SMALL
2242 /* display the license information of FreeBSD gzip */
2243 static void
2244 display_license(void)
2245 {
2246 
2247 	fprintf(stderr, "%s (based on NetBSD gzip 20150113)\n", gzip_version);
2248 	fprintf(stderr, "%s\n", gzip_copyright);
2249 	exit(0);
2250 }
2251 #endif
2252 
2253 /* display the version of NetBSD gzip */
2254 static void
2255 display_version(void)
2256 {
2257 
2258 	fprintf(stderr, "%s\n", gzip_version);
2259 	exit(0);
2260 }
2261 
2262 #ifndef NO_BZIP2_SUPPORT
2263 #include "unbzip2.c"
2264 #endif
2265 #ifndef NO_COMPRESS_SUPPORT
2266 #include "zuncompress.c"
2267 #endif
2268 #ifndef NO_PACK_SUPPORT
2269 #include "unpack.c"
2270 #endif
2271 #ifndef NO_XZ_SUPPORT
2272 #include "unxz.c"
2273 #endif
2274 
2275 static ssize_t
2276 read_retry(int fd, void *buf, size_t sz)
2277 {
2278 	char *cp = buf;
2279 	size_t left = MIN(sz, (size_t) SSIZE_MAX);
2280 
2281 	while (left > 0) {
2282 		ssize_t ret;
2283 
2284 		ret = read(fd, cp, left);
2285 		if (ret == -1) {
2286 			return ret;
2287 		} else if (ret == 0) {
2288 			break; /* EOF */
2289 		}
2290 		cp += ret;
2291 		left -= ret;
2292 	}
2293 
2294 	return sz - left;
2295 }
2296 
2297 static ssize_t
2298 write_retry(int fd, const void *buf, size_t sz)
2299 {
2300 	const char *cp = buf;
2301 	size_t left = MIN(sz, (size_t) SSIZE_MAX);
2302 
2303 	while (left > 0) {
2304 		ssize_t ret;
2305 
2306 		ret = write(fd, cp, left);
2307 		if (ret == -1) {
2308 			return ret;
2309 		} else if (ret == 0) {
2310 			abort();	/* Can't happen */
2311 		}
2312 		cp += ret;
2313 		left -= ret;
2314 	}
2315 
2316 	return sz - left;
2317 }
2318