1 /* $NetBSD: gzip.c,v 1.127 2024/06/01 10:17:12 martin Exp $ */
2
3 /*
4 * Copyright (c) 1997-2024 Matthew R. Green
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #if HAVE_NBTOOL_CONFIG_H
30 #include "nbtool_config.h"
31 #endif
32
33 #include <sys/cdefs.h>
34 #ifndef lint
35 __COPYRIGHT("@(#) Copyright (c) 1997-2024 Matthew R. Green. "
36 "All rights reserved.");
37 __RCSID("$NetBSD: gzip.c,v 1.127 2024/06/01 10:17:12 martin Exp $");
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 * - handle some signals better (remove outfile?)
50 * - make bzip2/compress -v/-t/-l support work as well as possible
51 */
52
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 #include <paths.h>
72
73 #ifndef PRIdOFF
74 #define PRIdOFF PRId64
75 #endif
76
77 /* what type of file are we dealing with */
78 enum filetype {
79 FT_GZIP,
80 #ifndef NO_BZIP2_SUPPORT
81 FT_BZIP2,
82 #endif
83 #ifndef NO_COMPRESS_SUPPORT
84 FT_Z,
85 #endif
86 #ifndef NO_PACK_SUPPORT
87 FT_PACK,
88 #endif
89 #ifndef NO_XZ_SUPPORT
90 FT_XZ,
91 #endif
92 #ifndef NO_LZ_SUPPORT
93 FT_LZ,
94 #endif
95 FT_LAST,
96 FT_UNKNOWN
97 };
98
99 #ifndef NO_BZIP2_SUPPORT
100 #include <bzlib.h>
101
102 #define BZ2_SUFFIX ".bz2"
103 #define BZIP2_MAGIC "\102\132\150"
104 #endif
105
106 #ifndef NO_COMPRESS_SUPPORT
107 #define Z_SUFFIX ".Z"
108 #define Z_MAGIC "\037\235"
109 #endif
110
111 #ifndef NO_PACK_SUPPORT
112 #define PACK_MAGIC "\037\036"
113 #endif
114
115 #ifndef NO_XZ_SUPPORT
116 #include <lzma.h>
117 #define XZ_SUFFIX ".xz"
118 #define XZ_MAGIC "\3757zXZ"
119 #endif
120
121 #ifndef NO_LZ_SUPPORT
122 #define LZ_SUFFIX ".lz"
123 #define LZ_MAGIC "LZIP"
124 #endif
125
126 #define GZ_SUFFIX ".gz"
127
128 #define BUFLEN (64 * 1024)
129
130 #define GZIP_MAGIC0 0x1F
131 #define GZIP_MAGIC1 0x8B
132 #define GZIP_OMAGIC1 0x9E
133
134 #define GZIP_TIMESTAMP (off_t)4
135 #define GZIP_ORIGNAME (off_t)10
136
137 #define HEAD_CRC 0x02
138 #define EXTRA_FIELD 0x04
139 #define ORIG_NAME 0x08
140 #define COMMENT 0x10
141
142 #define OS_CODE 3 /* Unix */
143
144 typedef struct {
145 const char *zipped;
146 int ziplen;
147 const char *normal; /* for unzip - must not be longer than zipped */
148 } suffixes_t;
149 static suffixes_t suffixes[] = {
150 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N}
151 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S .xxx */
152 #ifndef SMALL
153 SUFFIX(GZ_SUFFIX, ""),
154 SUFFIX(".z", ""),
155 SUFFIX("-gz", ""),
156 SUFFIX("-z", ""),
157 SUFFIX("_z", ""),
158 SUFFIX(".taz", ".tar"),
159 SUFFIX(".tgz", ".tar"),
160 #ifndef NO_BZIP2_SUPPORT
161 SUFFIX(BZ2_SUFFIX, ""),
162 #endif
163 #ifndef NO_COMPRESS_SUPPORT
164 SUFFIX(Z_SUFFIX, ""),
165 #endif
166 #ifndef NO_XZ_SUPPORT
167 SUFFIX(XZ_SUFFIX, ""),
168 #endif
169 #ifndef NO_LZ_SUPPORT
170 SUFFIX(LZ_SUFFIX, ""),
171 #endif
172 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S "" */
173 #endif /* SMALL */
174 #undef SUFFIX
175 };
176 #define NUM_SUFFIXES (sizeof suffixes / sizeof suffixes[0])
177 #define SUFFIX_MAXLEN 30
178
179 static const char gzip_version[] = "NetBSD gzip 20240203";
180
181 static int cflag; /* stdout mode */
182 static int dflag; /* decompress mode */
183 static int lflag; /* list mode */
184 static int numflag = 6; /* gzip -1..-9 value */
185
186 #ifndef SMALL
187 static int fflag; /* force mode */
188 static int kflag; /* don't delete input files */
189 static int nflag; /* don't save name/timestamp */
190 static int Nflag; /* don't restore name/timestamp */
191 static int qflag; /* quiet mode */
192 static int rflag; /* recursive mode */
193 static int tflag; /* test */
194 static int vflag; /* verbose mode */
195 #ifdef SIGINFO
196 static sig_atomic_t print_info = 0;
197 #endif
198 #else
199 #define qflag 0
200 #define tflag 0
201 #endif
202
203 static int exit_value = 0; /* exit value */
204
205 static const char *infile; /* name of file coming in */
206
207 static void maybe_err(const char *fmt, ...) __printflike(1, 2) __dead;
208 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) || \
209 !defined(NO_XZ_SUPPORT)
210 static void maybe_errx(const char *fmt, ...) __printflike(1, 2) __dead;
211 #endif
212 static void maybe_warn(const char *fmt, ...) __printflike(1, 2);
213 static void maybe_warnx(const char *fmt, ...) __printflike(1, 2);
214 static enum filetype file_gettype(u_char *);
215 #ifdef SMALL
216 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz)
217 #endif
218 static off_t gz_compress(int, int, off_t *, const char *, uint32_t);
219 static off_t gz_uncompress(int, int, char *, size_t, off_t *, const char *);
220 static off_t file_compress(char *, char *, size_t);
221 static off_t file_uncompress(char *, char *, size_t);
222 static void handle_pathname(char *);
223 static void handle_file(char *, struct stat *);
224 static void handle_stdin(void);
225 static void handle_stdout(void);
226 static void print_ratio(off_t, off_t, FILE *);
227 static void print_list(int fd, off_t, const char *, time_t);
228 __dead static void usage(void);
229 __dead static void display_version(void);
230 static const suffixes_t *check_suffix(char *, int);
231 static ssize_t read_retry(int, void *, size_t);
232 static ssize_t write_retry(int, const void *, size_t);
233 static void print_list_out(off_t, off_t, const char*);
234
235 #ifdef SMALL
236 #define infile_set(f,t) infile_set(f)
237 #endif
238 static void infile_set(const char *newinfile, off_t total);
239
240 #ifdef SMALL
241 #define unlink_input(f, sb) unlink(f)
242 #define check_siginfo() /* nothing */
243 #define setup_signals() /* nothing */
244 #define infile_newdata(t) /* nothing */
245 #else
246 static off_t infile_total; /* total expected to read/write */
247 static off_t infile_current; /* current read/write */
248
249 #ifdef SIGINFO
250 static void check_siginfo(void);
251 #else
252 #define check_siginfo() /* nothing */
253 #endif
254 static off_t cat_fd(unsigned char *, size_t, off_t *, int fd);
255 static void prepend_gzip(char *, int *, char ***);
256 static void handle_dir(char *);
257 static void print_verbage(const char *, const char *, off_t, off_t);
258 static void print_test(const char *, int);
259 static void copymodes(int fd, const struct stat *, const char *file);
260 static int check_outfile(const char *outfile);
261 static void setup_signals(void);
262 static void infile_newdata(size_t newdata);
263 static void infile_clear(void);
264 #endif
265
266 #ifndef NO_BZIP2_SUPPORT
267 static off_t unbzip2(int, int, char *, size_t, off_t *);
268 #endif
269
270 #ifndef NO_COMPRESS_SUPPORT
271 static FILE *zdopen(int);
272 static off_t zuncompress(FILE *, FILE *, char *, size_t, off_t *);
273 #endif
274
275 #ifndef NO_PACK_SUPPORT
276 static off_t unpack(int, int, char *, size_t, off_t *);
277 #endif
278
279 #ifndef NO_XZ_SUPPORT
280 static off_t unxz(int, int, char *, size_t, off_t *);
281 static off_t unxz_len(int);
282 #endif
283
284 #ifndef NO_LZ_SUPPORT
285 static off_t unlz(int, int, char *, size_t, off_t *);
286 #endif
287
288 #ifdef SMALL
289 #define getopt_long(a,b,c,d,e) getopt(a,b,c)
290 #else
291 static const struct option longopts[] = {
292 { "stdout", no_argument, 0, 'c' },
293 { "to-stdout", no_argument, 0, 'c' },
294 { "decompress", no_argument, 0, 'd' },
295 { "uncompress", no_argument, 0, 'd' },
296 { "force", no_argument, 0, 'f' },
297 { "help", no_argument, 0, 'h' },
298 { "keep", no_argument, 0, 'k' },
299 { "list", no_argument, 0, 'l' },
300 { "no-name", no_argument, 0, 'n' },
301 { "name", no_argument, 0, 'N' },
302 { "quiet", no_argument, 0, 'q' },
303 { "recursive", no_argument, 0, 'r' },
304 { "suffix", required_argument, 0, 'S' },
305 { "test", no_argument, 0, 't' },
306 { "verbose", no_argument, 0, 'v' },
307 { "version", no_argument, 0, 'V' },
308 { "fast", no_argument, 0, '1' },
309 { "best", no_argument, 0, '9' },
310 #if 0
311 /*
312 * This is what else GNU gzip implements. --ascii isn't useful
313 * on NetBSD, and I don't care to have a --license.
314 */
315 { "ascii", no_argument, 0, 'a' },
316 { "license", no_argument, 0, 'L' },
317 #endif
318 { NULL, no_argument, 0, 0 },
319 };
320 #endif
321
322 int
main(int argc,char ** argv)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 "123456789cdhlVn"
351 #else
352 #define OPT_LIST "123456789cdfhklNnqrS: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 'f':
377 fflag = 1;
378 break;
379 case 'k':
380 kflag = 1;
381 break;
382 case 'N':
383 nflag = 0;
384 Nflag = 1;
385 break;
386 case 'n':
387 nflag = 1;
388 Nflag = 0;
389 break;
390 case 'q':
391 qflag = 1;
392 break;
393 case 'r':
394 rflag = 1;
395 break;
396 case 'S':
397 len = strlen(optarg);
398 if (len != 0) {
399 if (len > SUFFIX_MAXLEN)
400 errx(1, "incorrect suffix: '%s'", optarg);
401 suffixes[0].zipped = optarg;
402 suffixes[0].ziplen = len;
403 } else {
404 suffixes[NUM_SUFFIXES - 1].zipped = "";
405 suffixes[NUM_SUFFIXES - 1].ziplen = 0;
406 }
407 break;
408 case 't':
409 cflag = 1;
410 tflag = 1;
411 dflag = 1;
412 break;
413 case 'v':
414 vflag = 1;
415 break;
416 #else
417 case 'n':
418 break;
419 #endif
420 default:
421 usage();
422 /* NOTREACHED */
423 }
424 }
425 argv += optind;
426 argc -= optind;
427
428 if (argc == 0) {
429 if (dflag) /* stdin mode */
430 handle_stdin();
431 else /* stdout mode */
432 handle_stdout();
433 } else {
434 do {
435 handle_pathname(argv[0]);
436 } while (*++argv);
437 }
438 #ifndef SMALL
439 if (qflag == 0 && lflag && argc > 1)
440 print_list(-1, 0, "(totals)", 0);
441 #endif
442 exit(exit_value);
443 }
444
445 /* maybe print a warning */
446 void
maybe_warn(const char * fmt,...)447 maybe_warn(const char *fmt, ...)
448 {
449 va_list ap;
450
451 if (qflag == 0) {
452 va_start(ap, fmt);
453 vwarn(fmt, ap);
454 va_end(ap);
455 }
456 if (exit_value == 0)
457 exit_value = 1;
458 }
459
460 /* ... without an errno. */
461 void
maybe_warnx(const char * fmt,...)462 maybe_warnx(const char *fmt, ...)
463 {
464 va_list ap;
465
466 if (qflag == 0) {
467 va_start(ap, fmt);
468 vwarnx(fmt, ap);
469 va_end(ap);
470 }
471 if (exit_value == 0)
472 exit_value = 1;
473 }
474
475 /* maybe print an error */
476 void
maybe_err(const char * fmt,...)477 maybe_err(const char *fmt, ...)
478 {
479 va_list ap;
480
481 if (qflag == 0) {
482 va_start(ap, fmt);
483 vwarn(fmt, ap);
484 va_end(ap);
485 }
486 exit(2);
487 }
488
489 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) || \
490 !defined(NO_XZ_SUPPORT)
491 /* ... without an errno. */
492 void
maybe_errx(const char * fmt,...)493 maybe_errx(const char *fmt, ...)
494 {
495 va_list ap;
496
497 if (qflag == 0) {
498 va_start(ap, fmt);
499 vwarnx(fmt, ap);
500 va_end(ap);
501 }
502 exit(2);
503 }
504 #endif
505
506 #ifndef SMALL
507 /* split up $GZIP and prepend it to the argument list */
508 static void
prepend_gzip(char * gzip,int * argc,char *** argv)509 prepend_gzip(char *gzip, int *argc, char ***argv)
510 {
511 char *s, **nargv, **ac;
512 int nenvarg = 0, i;
513
514 /* scan how many arguments there are */
515 for (s = gzip;;) {
516 while (*s == ' ' || *s == '\t')
517 s++;
518 if (*s == 0)
519 goto count_done;
520 nenvarg++;
521 while (*s != ' ' && *s != '\t')
522 if (*s++ == 0)
523 goto count_done;
524 }
525 count_done:
526 /* punt early */
527 if (nenvarg == 0)
528 return;
529
530 *argc += nenvarg;
531 ac = *argv;
532
533 nargv = (char **)malloc((*argc + 1) * sizeof(char *));
534 if (nargv == NULL)
535 maybe_err("malloc");
536
537 /* stash this away */
538 *argv = nargv;
539
540 /* copy the program name first */
541 i = 0;
542 nargv[i++] = *(ac++);
543
544 /* take a copy of $GZIP and add it to the array */
545 s = strdup(gzip);
546 if (s == NULL)
547 maybe_err("strdup");
548 for (;;) {
549 /* Skip whitespaces. */
550 while (*s == ' ' || *s == '\t')
551 s++;
552 if (*s == 0)
553 goto copy_done;
554 nargv[i++] = s;
555 /* Find the end of this argument. */
556 while (*s != ' ' && *s != '\t')
557 if (*s++ == 0)
558 /* Argument followed by NUL. */
559 goto copy_done;
560 /* Terminate by overwriting ' ' or '\t' with NUL. */
561 *s++ = 0;
562 }
563 copy_done:
564
565 /* copy the original arguments and a NULL */
566 while (*ac)
567 nargv[i++] = *(ac++);
568 nargv[i] = NULL;
569 }
570 #endif
571
572 /* compress input to output. Return bytes read, -1 on error */
573 static off_t
gz_compress(int in,int out,off_t * gsizep,const char * origname,uint32_t mtime)574 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
575 {
576 z_stream z;
577 char *outbufp, *inbufp;
578 off_t in_tot = 0, out_tot = 0;
579 ssize_t in_size;
580 int i, error;
581 uLong crc;
582 #ifdef SMALL
583 static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0,
584 0, 0, 0, 0,
585 0, OS_CODE };
586 #endif
587
588 outbufp = malloc(BUFLEN);
589 inbufp = malloc(BUFLEN);
590 if (outbufp == NULL || inbufp == NULL) {
591 maybe_err("malloc failed");
592 goto out;
593 }
594
595 memset(&z, 0, sizeof z);
596 z.zalloc = Z_NULL;
597 z.zfree = Z_NULL;
598 z.opaque = 0;
599
600 #ifdef SMALL
601 memcpy(outbufp, header, sizeof header);
602 i = sizeof header;
603 #else
604 if (nflag != 0) {
605 mtime = 0;
606 origname = "";
607 }
608
609 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
610 GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
611 *origname ? ORIG_NAME : 0,
612 mtime & 0xff,
613 (mtime >> 8) & 0xff,
614 (mtime >> 16) & 0xff,
615 (mtime >> 24) & 0xff,
616 numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
617 OS_CODE, origname);
618 if (i >= BUFLEN)
619 /* this need PATH_MAX > BUFLEN ... */
620 maybe_err("snprintf");
621 if (*origname)
622 i++;
623 #endif
624
625 z.next_out = (unsigned char *)outbufp + i;
626 z.avail_out = BUFLEN - i;
627
628 error = deflateInit2(&z, numflag, Z_DEFLATED,
629 (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY);
630 if (error != Z_OK) {
631 maybe_warnx("deflateInit2 failed");
632 in_tot = -1;
633 goto out;
634 }
635
636 crc = crc32(0L, Z_NULL, 0);
637 for (;;) {
638 check_siginfo();
639 if (z.avail_out == 0) {
640 if (write_retry(out, outbufp, BUFLEN) != BUFLEN) {
641 maybe_warn("write");
642 out_tot = -1;
643 goto out;
644 }
645
646 out_tot += BUFLEN;
647 z.next_out = (unsigned char *)outbufp;
648 z.avail_out = BUFLEN;
649 }
650
651 if (z.avail_in == 0) {
652 in_size = read(in, inbufp, BUFLEN);
653 if (in_size < 0) {
654 maybe_warn("read");
655 in_tot = -1;
656 goto out;
657 }
658 if (in_size == 0)
659 break;
660 infile_newdata(in_size);
661
662 crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
663 in_tot += in_size;
664 z.next_in = (unsigned char *)inbufp;
665 z.avail_in = in_size;
666 }
667
668 error = deflate(&z, Z_NO_FLUSH);
669 if (error != Z_OK && error != Z_STREAM_END) {
670 maybe_warnx("deflate failed");
671 in_tot = -1;
672 goto out;
673 }
674 }
675
676 /* clean up */
677 for (;;) {
678 size_t len;
679 ssize_t w;
680
681 error = deflate(&z, Z_FINISH);
682 if (error != Z_OK && error != Z_STREAM_END) {
683 maybe_warnx("deflate failed");
684 in_tot = -1;
685 goto out;
686 }
687
688 len = (char *)z.next_out - outbufp;
689
690 w = write_retry(out, outbufp, len);
691 if (w == -1 || (size_t)w != len) {
692 maybe_warn("write");
693 out_tot = -1;
694 goto out;
695 }
696 out_tot += len;
697 z.next_out = (unsigned char *)outbufp;
698 z.avail_out = BUFLEN;
699
700 if (error == Z_STREAM_END)
701 break;
702 }
703
704 if (deflateEnd(&z) != Z_OK) {
705 maybe_warnx("deflateEnd failed");
706 in_tot = -1;
707 goto out;
708 }
709
710 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
711 (int)crc & 0xff,
712 (int)(crc >> 8) & 0xff,
713 (int)(crc >> 16) & 0xff,
714 (int)(crc >> 24) & 0xff,
715 (int)in_tot & 0xff,
716 (int)(in_tot >> 8) & 0xff,
717 (int)(in_tot >> 16) & 0xff,
718 (int)(in_tot >> 24) & 0xff);
719 if (i != 8)
720 maybe_err("snprintf");
721 #if 0
722 if (in_tot > 0xffffffff)
723 maybe_warn("input file size >= 4GB cannot be saved");
724 #endif
725 if (write_retry(out, outbufp, i) != i) {
726 maybe_warn("write");
727 in_tot = -1;
728 } else
729 out_tot += i;
730
731 out:
732 if (inbufp != NULL)
733 free(inbufp);
734 if (outbufp != NULL)
735 free(outbufp);
736 if (gsizep)
737 *gsizep = out_tot;
738 return in_tot;
739 }
740
741 /*
742 * uncompress input to output then close the input. return the
743 * uncompressed size written, and put the compressed sized read
744 * into `*gsizep'.
745 */
746 static off_t
gz_uncompress(int in,int out,char * pre,size_t prelen,off_t * gsizep,const char * filename)747 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
748 const char *filename)
749 {
750 z_stream z;
751 char *outbufp, *inbufp;
752 off_t out_tot = -1, in_tot = 0;
753 uint32_t out_sub_tot = 0;
754 enum {
755 GZSTATE_MAGIC0,
756 GZSTATE_MAGIC1,
757 GZSTATE_METHOD,
758 GZSTATE_FLAGS,
759 GZSTATE_SKIPPING,
760 GZSTATE_EXTRA,
761 GZSTATE_EXTRA2,
762 GZSTATE_EXTRA3,
763 GZSTATE_ORIGNAME,
764 GZSTATE_COMMENT,
765 GZSTATE_HEAD_CRC1,
766 GZSTATE_HEAD_CRC2,
767 GZSTATE_INIT,
768 GZSTATE_READ,
769 GZSTATE_CRC,
770 GZSTATE_LEN,
771 } state = GZSTATE_MAGIC0;
772 int flags = 0, skip_count = 0;
773 int error = Z_STREAM_ERROR, done_reading = 0;
774 uLong crc = 0;
775 ssize_t wr;
776 int needmore = 0;
777
778 #define ADVANCE() { z.next_in++; z.avail_in--; }
779
780 if ((outbufp = malloc(BUFLEN)) == NULL) {
781 maybe_err("malloc failed");
782 goto out2;
783 }
784 if ((inbufp = malloc(BUFLEN)) == NULL) {
785 maybe_err("malloc failed");
786 goto out1;
787 }
788
789 memset(&z, 0, sizeof z);
790 z.avail_in = prelen;
791 z.next_in = (unsigned char *)pre;
792 z.avail_out = BUFLEN;
793 z.next_out = (unsigned char *)outbufp;
794 z.zalloc = NULL;
795 z.zfree = NULL;
796 z.opaque = 0;
797
798 in_tot = prelen;
799 out_tot = 0;
800
801 for (;;) {
802 check_siginfo();
803 if ((z.avail_in == 0 || needmore) && done_reading == 0) {
804 ssize_t in_size;
805
806 if (z.avail_in > 0) {
807 memmove(inbufp, z.next_in, z.avail_in);
808 }
809 z.next_in = (unsigned char *)inbufp;
810 in_size = read(in, z.next_in + z.avail_in,
811 BUFLEN - z.avail_in);
812
813 if (in_size == -1) {
814 maybe_warn("failed to read stdin");
815 goto stop_and_fail;
816 } else if (in_size == 0) {
817 done_reading = 1;
818 }
819 infile_newdata(in_size);
820
821 z.avail_in += in_size;
822 needmore = 0;
823
824 in_tot += in_size;
825 }
826 if (z.avail_in == 0) {
827 if (done_reading && state != GZSTATE_MAGIC0) {
828 maybe_warnx("%s: unexpected end of file",
829 filename);
830 goto stop_and_fail;
831 }
832 goto stop;
833 }
834 switch (state) {
835 case GZSTATE_MAGIC0:
836 if (*z.next_in != GZIP_MAGIC0) {
837 if (in_tot > 0) {
838 maybe_warnx("%s: trailing garbage "
839 "ignored", filename);
840 goto stop;
841 }
842 maybe_warnx("input not gziped (MAGIC0)");
843 exit_value = 2;
844 goto stop_and_fail;
845 }
846 ADVANCE();
847 state++;
848 out_sub_tot = 0;
849 crc = crc32(0L, Z_NULL, 0);
850 break;
851
852 case GZSTATE_MAGIC1:
853 if (*z.next_in != GZIP_MAGIC1 &&
854 *z.next_in != GZIP_OMAGIC1) {
855 maybe_warnx("input not gziped (MAGIC1)");
856 goto stop_and_fail;
857 }
858 ADVANCE();
859 state++;
860 break;
861
862 case GZSTATE_METHOD:
863 if (*z.next_in != Z_DEFLATED) {
864 maybe_warnx("unknown compression method");
865 goto stop_and_fail;
866 }
867 ADVANCE();
868 state++;
869 break;
870
871 case GZSTATE_FLAGS:
872 flags = *z.next_in;
873 ADVANCE();
874 skip_count = 6;
875 state++;
876 break;
877
878 case GZSTATE_SKIPPING:
879 if (skip_count > 0) {
880 skip_count--;
881 ADVANCE();
882 } else
883 state++;
884 break;
885
886 case GZSTATE_EXTRA:
887 if ((flags & EXTRA_FIELD) == 0) {
888 state = GZSTATE_ORIGNAME;
889 break;
890 }
891 skip_count = *z.next_in;
892 ADVANCE();
893 state++;
894 break;
895
896 case GZSTATE_EXTRA2:
897 skip_count |= ((*z.next_in) << 8);
898 ADVANCE();
899 state++;
900 break;
901
902 case GZSTATE_EXTRA3:
903 if (skip_count > 0) {
904 skip_count--;
905 ADVANCE();
906 } else
907 state++;
908 break;
909
910 case GZSTATE_ORIGNAME:
911 if ((flags & ORIG_NAME) == 0) {
912 state++;
913 break;
914 }
915 if (*z.next_in == 0)
916 state++;
917 ADVANCE();
918 break;
919
920 case GZSTATE_COMMENT:
921 if ((flags & COMMENT) == 0) {
922 state++;
923 break;
924 }
925 if (*z.next_in == 0)
926 state++;
927 ADVANCE();
928 break;
929
930 case GZSTATE_HEAD_CRC1:
931 if (flags & HEAD_CRC)
932 skip_count = 2;
933 else
934 skip_count = 0;
935 state++;
936 break;
937
938 case GZSTATE_HEAD_CRC2:
939 if (skip_count > 0) {
940 skip_count--;
941 ADVANCE();
942 } else
943 state++;
944 break;
945
946 case GZSTATE_INIT:
947 if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
948 maybe_warnx("failed to inflateInit");
949 goto stop_and_fail;
950 }
951 state++;
952 break;
953
954 case GZSTATE_READ:
955 error = inflate(&z, Z_FINISH);
956 switch (error) {
957 /* Z_BUF_ERROR goes with Z_FINISH... */
958 case Z_BUF_ERROR:
959 if (z.avail_out > 0 && !done_reading)
960 continue;
961
962 case Z_STREAM_END:
963 case Z_OK:
964 break;
965
966 case Z_NEED_DICT:
967 maybe_warnx("Z_NEED_DICT error");
968 goto stop_and_fail;
969 case Z_DATA_ERROR:
970 maybe_warnx("data stream error");
971 goto stop_and_fail;
972 case Z_STREAM_ERROR:
973 maybe_warnx("internal stream error");
974 goto stop_and_fail;
975 case Z_MEM_ERROR:
976 maybe_warnx("memory allocation error");
977 goto stop_and_fail;
978
979 default:
980 maybe_warn("unknown error from inflate(): %d",
981 error);
982 }
983 wr = BUFLEN - z.avail_out;
984
985 if (wr != 0) {
986 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
987 if (
988 #ifndef SMALL
989 /* don't write anything with -t */
990 tflag == 0 &&
991 #endif
992 write_retry(out, outbufp, wr) != wr) {
993 maybe_warn("error writing to output");
994 goto stop_and_fail;
995 }
996
997 out_tot += wr;
998 out_sub_tot += wr;
999 }
1000
1001 if (error == Z_STREAM_END) {
1002 inflateEnd(&z);
1003 state++;
1004 }
1005
1006 z.next_out = (unsigned char *)outbufp;
1007 z.avail_out = BUFLEN;
1008
1009 break;
1010 case GZSTATE_CRC:
1011 {
1012 uLong origcrc;
1013
1014 if (z.avail_in < 4) {
1015 if (!done_reading) {
1016 needmore = 1;
1017 continue;
1018 }
1019 maybe_warnx("truncated input");
1020 goto stop_and_fail;
1021 }
1022 origcrc = ((unsigned)z.next_in[0] & 0xff) |
1023 ((unsigned)z.next_in[1] & 0xff) << 8 |
1024 ((unsigned)z.next_in[2] & 0xff) << 16 |
1025 ((unsigned)z.next_in[3] & 0xff) << 24;
1026 if (origcrc != crc) {
1027 maybe_warnx("invalid compressed"
1028 " data--crc error");
1029 goto stop_and_fail;
1030 }
1031 }
1032
1033 z.avail_in -= 4;
1034 z.next_in += 4;
1035
1036 if (!z.avail_in && done_reading) {
1037 goto stop;
1038 }
1039 state++;
1040 break;
1041 case GZSTATE_LEN:
1042 {
1043 uLong origlen;
1044
1045 if (z.avail_in < 4) {
1046 if (!done_reading) {
1047 needmore = 1;
1048 continue;
1049 }
1050 maybe_warnx("truncated input");
1051 goto stop_and_fail;
1052 }
1053 origlen = ((unsigned)z.next_in[0] & 0xff) |
1054 ((unsigned)z.next_in[1] & 0xff) << 8 |
1055 ((unsigned)z.next_in[2] & 0xff) << 16 |
1056 ((unsigned)z.next_in[3] & 0xff) << 24;
1057
1058 if (origlen != out_sub_tot) {
1059 maybe_warnx("invalid compressed"
1060 " data--length error");
1061 goto stop_and_fail;
1062 }
1063 }
1064
1065 z.avail_in -= 4;
1066 z.next_in += 4;
1067
1068 if (error < 0) {
1069 maybe_warnx("decompression error");
1070 goto stop_and_fail;
1071 }
1072 state = GZSTATE_MAGIC0;
1073 break;
1074 }
1075 continue;
1076 stop_and_fail:
1077 out_tot = -1;
1078 stop:
1079 break;
1080 }
1081 if (state > GZSTATE_INIT)
1082 inflateEnd(&z);
1083
1084 free(inbufp);
1085 out1:
1086 free(outbufp);
1087 out2:
1088 if (gsizep)
1089 *gsizep = in_tot;
1090 return (out_tot);
1091 }
1092
1093 #ifndef SMALL
1094 /*
1095 * set the owner, mode, flags & utimes using the given file descriptor.
1096 * file is only used in possible warning messages.
1097 */
1098 static void
copymodes(int fd,const struct stat * sbp,const char * file)1099 copymodes(int fd, const struct stat *sbp, const char *file)
1100 {
1101 struct timeval times[2];
1102 struct stat sb;
1103
1104 /*
1105 * If we have no info on the input, give this file some
1106 * default values and return..
1107 */
1108 if (sbp == NULL) {
1109 mode_t mask = umask(022);
1110
1111 (void)fchmod(fd, DEFFILEMODE & ~mask);
1112 (void)umask(mask);
1113 return;
1114 }
1115 sb = *sbp;
1116
1117 /* if the chown fails, remove set-id bits as-per compress(1) */
1118 if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
1119 if (errno != EPERM)
1120 maybe_warn("couldn't fchown: %s", file);
1121 sb.st_mode &= ~(S_ISUID|S_ISGID);
1122 }
1123
1124 /* we only allow set-id and the 9 normal permission bits */
1125 sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1126 if (fchmod(fd, sb.st_mode) < 0)
1127 maybe_warn("couldn't fchmod: %s", file);
1128
1129 #if !HAVE_NBTOOL_CONFIG_H
1130 TIMESPEC_TO_TIMEVAL(×[0], &sb.st_atimespec);
1131 TIMESPEC_TO_TIMEVAL(×[1], &sb.st_mtimespec);
1132 if (futimes(fd, times) < 0)
1133 maybe_warn("couldn't utimes: %s", file);
1134
1135 /* finally, only try flags if they exist already */
1136 if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1137 maybe_warn("couldn't fchflags: %s", file);
1138 #endif
1139 }
1140 #endif
1141
1142 /* what sort of file is this? */
1143 static enum filetype
file_gettype(u_char * buf)1144 file_gettype(u_char *buf)
1145 {
1146
1147 if (buf[0] == GZIP_MAGIC0 &&
1148 (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1149 return FT_GZIP;
1150 else
1151 #ifndef NO_BZIP2_SUPPORT
1152 if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1153 buf[3] >= '0' && buf[3] <= '9')
1154 return FT_BZIP2;
1155 else
1156 #endif
1157 #ifndef NO_COMPRESS_SUPPORT
1158 if (memcmp(buf, Z_MAGIC, 2) == 0)
1159 return FT_Z;
1160 else
1161 #endif
1162 #ifndef NO_PACK_SUPPORT
1163 if (memcmp(buf, PACK_MAGIC, 2) == 0)
1164 return FT_PACK;
1165 else
1166 #endif
1167 #ifndef NO_XZ_SUPPORT
1168 if (memcmp(buf, XZ_MAGIC, 4) == 0) /* XXX: We only have 4 bytes */
1169 return FT_XZ;
1170 else
1171 #endif
1172 #ifndef NO_LZ_SUPPORT
1173 if (memcmp(buf, LZ_MAGIC, 4) == 0)
1174 return FT_LZ;
1175 else
1176 #endif
1177 return FT_UNKNOWN;
1178 }
1179
1180 #ifndef SMALL
1181 /* check the outfile is OK. */
1182 static int
check_outfile(const char * outfile)1183 check_outfile(const char *outfile)
1184 {
1185 struct stat sb;
1186 int ok = 1;
1187
1188 if (lflag == 0 && stat(outfile, &sb) == 0) {
1189 if (fflag)
1190 unlink(outfile);
1191 else if (isatty(STDIN_FILENO)) {
1192 char ans[10] = { 'n', '\0' }; /* default */
1193
1194 fprintf(stderr, "%s already exists -- do you wish to "
1195 "overwrite (y or n)? " , outfile);
1196 (void)fgets(ans, sizeof(ans) - 1, stdin);
1197 if (ans[0] != 'y' && ans[0] != 'Y') {
1198 fprintf(stderr, "\tnot overwriting\n");
1199 ok = 0;
1200 } else
1201 unlink(outfile);
1202 } else {
1203 maybe_warnx("%s already exists -- skipping", outfile);
1204 ok = 0;
1205 }
1206 }
1207 return ok;
1208 }
1209
1210 static void
unlink_input(const char * file,const struct stat * sb)1211 unlink_input(const char *file, const struct stat *sb)
1212 {
1213 struct stat nsb;
1214
1215 if (kflag)
1216 return;
1217 if (stat(file, &nsb) != 0)
1218 /* Must be gone already */
1219 return;
1220 if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1221 /* Definitely a different file */
1222 return;
1223 unlink(file);
1224 }
1225
1226 #ifdef SIGINFO
1227 static void
got_siginfo(int signo)1228 got_siginfo(int signo)
1229 {
1230
1231 print_info = 1;
1232 }
1233 #endif
1234
1235 static void
setup_signals(void)1236 setup_signals(void)
1237 {
1238
1239 #ifdef SIGINFO
1240 signal(SIGINFO, got_siginfo);
1241 #endif
1242 }
1243
1244 static void
infile_newdata(size_t newdata)1245 infile_newdata(size_t newdata)
1246 {
1247
1248 infile_current += newdata;
1249 }
1250 #endif
1251
1252 static void
infile_set(const char * newinfile,off_t total)1253 infile_set(const char *newinfile, off_t total)
1254 {
1255
1256 if (newinfile)
1257 infile = newinfile;
1258 #ifndef SMALL
1259 infile_total = total;
1260 #endif
1261 }
1262
1263 static void
infile_clear(void)1264 infile_clear(void)
1265 {
1266
1267 infile = NULL;
1268 #ifndef SMALL
1269 infile_total = infile_current = 0;
1270 #endif
1271 }
1272
1273 static const suffixes_t *
check_suffix(char * file,int xlate)1274 check_suffix(char *file, int xlate)
1275 {
1276 const suffixes_t *s;
1277 int len = strlen(file);
1278 char *sp;
1279
1280 for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1281 /* if it doesn't fit in "a.suf", don't bother */
1282 if (s->ziplen >= len)
1283 continue;
1284 sp = file + len - s->ziplen;
1285 if (strcmp(s->zipped, sp) != 0)
1286 continue;
1287 if (xlate)
1288 strcpy(sp, s->normal);
1289 return s;
1290 }
1291 return NULL;
1292 }
1293
1294 /*
1295 * compress the given file: create a corresponding .gz file and remove the
1296 * original.
1297 */
1298 static off_t
file_compress(char * file,char * outfile,size_t outsize)1299 file_compress(char *file, char *outfile, size_t outsize)
1300 {
1301 int in;
1302 int out;
1303 off_t size, in_size;
1304 #ifndef SMALL
1305 struct stat isb, osb;
1306 const suffixes_t *suff;
1307 #endif
1308
1309 in = open(file, O_RDONLY);
1310 if (in == -1) {
1311 maybe_warn("can't open %s", file);
1312 return -1;
1313 }
1314
1315 #ifndef SMALL
1316 if (fstat(in, &isb) != 0) {
1317 close(in);
1318 maybe_warn("can't stat %s", file);
1319 return -1;
1320 }
1321 infile_set(file, isb.st_size);
1322 #endif
1323
1324 if (cflag == 0) {
1325 #ifndef SMALL
1326 if (isb.st_nlink > 1 && fflag == 0) {
1327 maybe_warnx("%s has %d other link%s -- "
1328 "skipping", file, 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 } else
1365 out = STDOUT_FILENO;
1366
1367 in_size = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1368
1369 (void)close(in);
1370
1371 /*
1372 * If there was an error, in_size will be -1.
1373 * If we compressed to stdout, just return the size.
1374 * Otherwise stat the file and check it is the correct size.
1375 * We only blow away the file if we can stat the output and it
1376 * has the expected size.
1377 */
1378 if (cflag != 0)
1379 return in_size == -1 ? -1 : size;
1380
1381 #ifndef SMALL
1382 if (fstat(out, &osb) != 0) {
1383 maybe_warn("couldn't stat: %s", outfile);
1384 goto bad_outfile;
1385 }
1386
1387 if (osb.st_size != size) {
1388 maybe_warnx("output file: %s wrong size (%" PRIdOFF
1389 " != %" PRIdOFF "), deleting",
1390 outfile, osb.st_size, size);
1391 goto bad_outfile;
1392 }
1393
1394 copymodes(out, &isb, outfile);
1395 #endif
1396 if (close(out) == -1)
1397 maybe_warn("couldn't close output");
1398
1399 /* output is good, ok to delete input */
1400 unlink_input(file, &isb);
1401 return size;
1402
1403 #ifndef SMALL
1404 bad_outfile:
1405 if (close(out) == -1)
1406 maybe_warn("couldn't close output");
1407
1408 maybe_warnx("leaving original %s", file);
1409 unlink(outfile);
1410 return size;
1411 #endif
1412 }
1413
1414 /* uncompress the given file and remove the original */
1415 static off_t
file_uncompress(char * file,char * outfile,size_t outsize)1416 file_uncompress(char *file, char *outfile, size_t outsize)
1417 {
1418 struct stat isb, osb;
1419 off_t size;
1420 ssize_t rbytes;
1421 unsigned char fourbytes[4];
1422 enum filetype method;
1423 int fd, ofd, zfd = -1;
1424 size_t in_size;
1425 #ifndef SMALL
1426 ssize_t rv;
1427 time_t timestamp = 0;
1428 char name[PATH_MAX + 1];
1429 #endif
1430
1431 /* gather the old name info */
1432
1433 fd = open(file, O_RDONLY);
1434 if (fd < 0) {
1435 maybe_warn("can't open %s", file);
1436 goto lose;
1437 }
1438 if (fstat(fd, &isb) != 0) {
1439 close(fd);
1440 maybe_warn("can't stat %s", file);
1441 goto lose;
1442 }
1443 if (S_ISREG(isb.st_mode))
1444 in_size = isb.st_size;
1445 else
1446 in_size = 0;
1447 infile_set(file, in_size);
1448
1449 strlcpy(outfile, file, outsize);
1450 if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1451 maybe_warnx("%s: unknown suffix -- ignored", file);
1452 goto lose;
1453 }
1454
1455 rbytes = read(fd, fourbytes, sizeof fourbytes);
1456 if (rbytes != sizeof fourbytes) {
1457 /* we don't want to fail here. */
1458 #ifndef SMALL
1459 if (fflag)
1460 goto lose;
1461 #endif
1462 if (rbytes == -1)
1463 maybe_warn("can't read %s", file);
1464 else
1465 goto unexpected_EOF;
1466 goto lose;
1467 }
1468 infile_newdata(rbytes);
1469
1470 method = file_gettype(fourbytes);
1471 #ifndef SMALL
1472 if (fflag == 0 && method == FT_UNKNOWN) {
1473 maybe_warnx("%s: not in gzip format", file);
1474 goto lose;
1475 }
1476
1477 #endif
1478
1479 #ifndef SMALL
1480 if (method == FT_GZIP && Nflag) {
1481 unsigned char ts[4]; /* timestamp */
1482
1483 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1484 if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1485 goto unexpected_EOF;
1486 if (rv == -1) {
1487 if (!fflag)
1488 maybe_warn("can't read %s", file);
1489 goto lose;
1490 }
1491 infile_newdata(rv);
1492 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
1493
1494 if (fourbytes[3] & ORIG_NAME) {
1495 rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME);
1496 if (rbytes < 0) {
1497 maybe_warn("can't read %s", file);
1498 goto lose;
1499 }
1500 if (name[0] != '\0') {
1501 char *dp, *nf;
1502
1503 /* Make sure that name is NUL-terminated */
1504 name[rbytes] = '\0';
1505
1506 /* strip saved directory name */
1507 nf = strrchr(name, '/');
1508 if (nf == NULL)
1509 nf = name;
1510 else
1511 nf++;
1512
1513 /* preserve original directory name */
1514 dp = strrchr(file, '/');
1515 if (dp == NULL)
1516 dp = file;
1517 else
1518 dp++;
1519 snprintf(outfile, outsize, "%.*s%.*s",
1520 (int) (dp - file),
1521 file, (int) rbytes, nf);
1522 }
1523 }
1524 }
1525 #endif
1526 lseek(fd, 0, SEEK_SET);
1527
1528 if (cflag == 0 || lflag) {
1529 #ifndef SMALL
1530 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1531 maybe_warnx("%s has %d other links -- skipping",
1532 file, isb.st_nlink - 1);
1533 goto lose;
1534 }
1535 if (nflag == 0 && timestamp)
1536 isb.st_mtime = timestamp;
1537 if (check_outfile(outfile) == 0)
1538 goto lose;
1539 #endif
1540 }
1541
1542 if (cflag)
1543 zfd = STDOUT_FILENO;
1544 else if (lflag)
1545 zfd = -1;
1546 else {
1547 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1548 if (zfd == STDOUT_FILENO) {
1549 /* We won't close STDOUT_FILENO later... */
1550 zfd = dup(zfd);
1551 close(STDOUT_FILENO);
1552 }
1553 if (zfd == -1) {
1554 maybe_warn("can't open %s", outfile);
1555 goto lose;
1556 }
1557 }
1558
1559 switch (method) {
1560 #ifndef NO_BZIP2_SUPPORT
1561 case FT_BZIP2:
1562 /* XXX */
1563 if (lflag) {
1564 maybe_warnx("no -l with bzip2 files");
1565 goto lose;
1566 }
1567
1568 size = unbzip2(fd, zfd, NULL, 0, NULL);
1569 break;
1570 #endif
1571
1572 #ifndef NO_COMPRESS_SUPPORT
1573 case FT_Z: {
1574 FILE *in, *out;
1575
1576 /* XXX */
1577 if (lflag) {
1578 maybe_warnx("no -l with Lempel-Ziv files");
1579 goto lose;
1580 }
1581
1582 if ((in = zdopen(fd)) == NULL) {
1583 maybe_warn("zdopen for read: %s", file);
1584 goto lose;
1585 }
1586
1587 out = fdopen(dup(zfd), "w");
1588 if (out == NULL) {
1589 maybe_warn("fdopen for write: %s", outfile);
1590 fclose(in);
1591 goto lose;
1592 }
1593
1594 size = zuncompress(in, out, NULL, 0, NULL);
1595 /* need to fclose() if ferror() is true... */
1596 if (ferror(in) | fclose(in)) {
1597 maybe_warn("failed infile fclose");
1598 unlink(outfile);
1599 (void)fclose(out);
1600 }
1601 if (fclose(out) != 0) {
1602 maybe_warn("failed outfile fclose");
1603 unlink(outfile);
1604 goto lose;
1605 }
1606 break;
1607 }
1608 #endif
1609
1610 #ifndef NO_PACK_SUPPORT
1611 case FT_PACK:
1612 if (lflag) {
1613 maybe_warnx("no -l with packed files");
1614 goto lose;
1615 }
1616
1617 size = unpack(fd, zfd, NULL, 0, NULL);
1618 break;
1619 #endif
1620
1621 #ifndef NO_XZ_SUPPORT
1622 case FT_XZ:
1623 if (lflag) {
1624 size = unxz_len(fd);
1625 print_list_out(in_size, size, file);
1626 return -1;
1627 }
1628 size = unxz(fd, zfd, NULL, 0, NULL);
1629 break;
1630 #endif
1631
1632 #ifndef NO_LZ_SUPPORT
1633 case FT_LZ:
1634 if (lflag) {
1635 maybe_warnx("no -l with lzip files");
1636 goto lose;
1637 }
1638 size = unlz(fd, zfd, NULL, 0, NULL);
1639 break;
1640 #endif
1641 #ifndef SMALL
1642 case FT_UNKNOWN:
1643 if (lflag) {
1644 maybe_warnx("no -l for unknown filetypes");
1645 goto lose;
1646 }
1647 size = cat_fd(NULL, 0, NULL, fd);
1648 break;
1649 #endif
1650 default:
1651 if (lflag) {
1652 print_list(fd, in_size, outfile, isb.st_mtime);
1653 close(fd);
1654 return -1; /* XXX */
1655 }
1656
1657 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1658 break;
1659 }
1660
1661 if (close(fd) != 0)
1662 maybe_warn("couldn't close input");
1663 if (zfd != STDOUT_FILENO && close(zfd) != 0)
1664 maybe_warn("couldn't close output");
1665
1666 if (size == -1) {
1667 if (cflag == 0)
1668 unlink(outfile);
1669 maybe_warnx("%s: uncompress failed", file);
1670 return -1;
1671 }
1672
1673 /* if testing, or we uncompressed to stdout, this is all we need */
1674 #ifndef SMALL
1675 if (tflag)
1676 return size;
1677 #endif
1678 /* if we are uncompressing to stdin, don't remove the file. */
1679 if (cflag)
1680 return size;
1681
1682 /*
1683 * if we create a file...
1684 */
1685 /*
1686 * if we can't stat the file don't remove the file.
1687 */
1688
1689 ofd = open(outfile, O_RDWR, 0);
1690 if (ofd == -1) {
1691 maybe_warn("couldn't open (leaving original): %s",
1692 outfile);
1693 return -1;
1694 }
1695 if (fstat(ofd, &osb) != 0) {
1696 maybe_warn("couldn't stat (leaving original): %s",
1697 outfile);
1698 close(ofd);
1699 return -1;
1700 }
1701 if (osb.st_size != size) {
1702 maybe_warnx("stat gave different size: %" PRIdOFF
1703 " != %" PRIdOFF " (leaving original)",
1704 size, osb.st_size);
1705 close(ofd);
1706 unlink(outfile);
1707 return -1;
1708 }
1709 unlink_input(file, &isb);
1710 #ifndef SMALL
1711 copymodes(ofd, &isb, outfile);
1712 #endif
1713 close(ofd);
1714 return size;
1715
1716 unexpected_EOF:
1717 maybe_warnx("%s: unexpected end of file", file);
1718 lose:
1719 if (fd != -1)
1720 close(fd);
1721 if (zfd != -1 && zfd != STDOUT_FILENO)
1722 close(fd);
1723 return -1;
1724 }
1725
1726 #ifndef check_siginfo
1727 static void
check_siginfo(void)1728 check_siginfo(void)
1729 {
1730 static int ttyfd = -2;
1731 char buf[2048];
1732 int n;
1733
1734 if (print_info == 0)
1735 return;
1736
1737 if (!infile)
1738 goto out;
1739
1740 if (ttyfd == -2)
1741 ttyfd = open(_PATH_TTY, O_RDWR | O_CLOEXEC);
1742
1743 if (ttyfd == -1)
1744 goto out;
1745
1746 if (infile_total) {
1747 const double pcent = (100.0 * infile_current) / infile_total;
1748
1749 n = snprintf(buf, sizeof(buf),
1750 "%s: %s: done %ju/%ju bytes (%3.2f%%)\n",
1751 getprogname(), infile, (uintmax_t)infile_current,
1752 (uintmax_t)infile_total, pcent);
1753 } else {
1754 n = snprintf(buf, sizeof(buf), "%s: %s: done %ju bytes\n",
1755 getprogname(), infile, (uintmax_t)infile_current);
1756 }
1757
1758 if (n <= 0)
1759 goto out;
1760
1761 write(ttyfd, buf, (size_t)n);
1762 out:
1763 print_info = 0;
1764 }
1765 #endif
1766
1767 static off_t
cat_fd(unsigned char * prepend,size_t count,off_t * gsizep,int fd)1768 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1769 {
1770 char buf[BUFLEN];
1771 off_t in_tot;
1772 ssize_t w;
1773
1774 in_tot = count;
1775 w = write_retry(STDOUT_FILENO, prepend, count);
1776 if (w == -1 || (size_t)w != count) {
1777 maybe_warn("write to stdout");
1778 return -1;
1779 }
1780 for (;;) {
1781 ssize_t rv;
1782
1783 rv = read(fd, buf, sizeof buf);
1784 if (rv == 0)
1785 break;
1786 if (rv < 0) {
1787 maybe_warn("read from fd %d", fd);
1788 break;
1789 }
1790 infile_newdata(rv);
1791
1792 if (write_retry(STDOUT_FILENO, buf, rv) != rv) {
1793 maybe_warn("write to stdout");
1794 break;
1795 }
1796 in_tot += rv;
1797 }
1798
1799 if (gsizep)
1800 *gsizep = in_tot;
1801 return (in_tot);
1802 }
1803
1804 static void
handle_stdin(void)1805 handle_stdin(void)
1806 {
1807 struct stat isb;
1808 unsigned char fourbytes[4];
1809 size_t in_size;
1810 off_t usize, gsize;
1811 enum filetype method;
1812 ssize_t bytes_read;
1813 #ifndef NO_COMPRESS_SUPPORT
1814 FILE *in;
1815 #endif
1816
1817 #ifndef SMALL
1818 if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1819 maybe_warnx("standard input is a terminal -- ignoring");
1820 goto out;
1821 }
1822 #endif
1823
1824 if (fstat(STDIN_FILENO, &isb) < 0) {
1825 maybe_warn("fstat");
1826 goto out;
1827 }
1828 if (S_ISREG(isb.st_mode))
1829 in_size = isb.st_size;
1830 else
1831 in_size = 0;
1832 infile_set("(stdin)", in_size);
1833
1834 if (lflag) {
1835 print_list(STDIN_FILENO, in_size, infile, isb.st_mtime);
1836 goto out;
1837 }
1838
1839 bytes_read = read_retry(STDIN_FILENO, fourbytes, sizeof fourbytes);
1840 if (bytes_read == -1) {
1841 maybe_warn("can't read stdin");
1842 goto out;
1843 } else if (bytes_read != sizeof(fourbytes)) {
1844 maybe_warnx("(stdin): unexpected end of file");
1845 goto out;
1846 }
1847
1848 method = file_gettype(fourbytes);
1849 switch (method) {
1850 default:
1851 #ifndef SMALL
1852 if (fflag == 0) {
1853 maybe_warnx("unknown compression format");
1854 goto out;
1855 }
1856 usize = cat_fd(fourbytes, sizeof fourbytes, &gsize, STDIN_FILENO);
1857 break;
1858 #endif
1859 case FT_GZIP:
1860 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1861 (char *)fourbytes, sizeof fourbytes, &gsize, "(stdin)");
1862 break;
1863 #ifndef NO_BZIP2_SUPPORT
1864 case FT_BZIP2:
1865 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1866 (char *)fourbytes, sizeof fourbytes, &gsize);
1867 break;
1868 #endif
1869 #ifndef NO_COMPRESS_SUPPORT
1870 case FT_Z:
1871 if ((in = zdopen(STDIN_FILENO)) == NULL) {
1872 maybe_warnx("zopen of stdin");
1873 goto out;
1874 }
1875
1876 usize = zuncompress(in, stdout, (char *)fourbytes,
1877 sizeof fourbytes, &gsize);
1878 fclose(in);
1879 break;
1880 #endif
1881 #ifndef NO_PACK_SUPPORT
1882 case FT_PACK:
1883 usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1884 (char *)fourbytes, sizeof fourbytes, &gsize);
1885 break;
1886 #endif
1887 #ifndef NO_XZ_SUPPORT
1888 case FT_XZ:
1889 usize = unxz(STDIN_FILENO, STDOUT_FILENO,
1890 (char *)fourbytes, sizeof fourbytes, &gsize);
1891 break;
1892 #endif
1893 #ifndef NO_LZ_SUPPORT
1894 case FT_LZ:
1895 usize = unlz(STDIN_FILENO, STDOUT_FILENO,
1896 (char *)fourbytes, sizeof fourbytes, &gsize);
1897 break;
1898 #endif
1899 }
1900
1901 #ifndef SMALL
1902 if (vflag && !tflag && usize != -1 && gsize != -1)
1903 print_verbage(NULL, NULL, usize, gsize);
1904 if (vflag && tflag)
1905 print_test("(stdin)", usize != -1);
1906 #else
1907 (void)&usize;
1908 #endif
1909
1910 out:
1911 infile_clear();
1912 }
1913
1914 static void
handle_stdout(void)1915 handle_stdout(void)
1916 {
1917 off_t gsize;
1918 #ifndef SMALL
1919 off_t usize;
1920 struct stat sb;
1921 time_t systime;
1922 uint32_t mtime;
1923 int ret;
1924
1925 infile_set("<stdout>", 0);
1926
1927 if (fflag == 0 && isatty(STDOUT_FILENO)) {
1928 maybe_warnx("standard output is a terminal -- ignoring");
1929 return;
1930 }
1931
1932 /* If stdin is a file use its mtime, otherwise use current time */
1933 ret = fstat(STDIN_FILENO, &sb);
1934 if (ret < 0) {
1935 maybe_warn("Can't stat stdin");
1936 return;
1937 }
1938
1939 if (S_ISREG(sb.st_mode)) {
1940 infile_set("<stdout>", sb.st_size);
1941 mtime = (uint32_t)sb.st_mtime;
1942 } else {
1943 systime = time(NULL);
1944 if (systime == -1) {
1945 maybe_warn("time");
1946 return;
1947 }
1948 mtime = (uint32_t)systime;
1949 }
1950
1951 usize =
1952 #endif
1953 gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1954 #ifndef SMALL
1955 if (vflag && !tflag && usize != -1 && gsize != -1)
1956 print_verbage(NULL, NULL, usize, gsize);
1957 #endif
1958 }
1959
1960 /* do what is asked for, for the path name */
1961 static void
handle_pathname(char * path)1962 handle_pathname(char *path)
1963 {
1964 char *opath = path, *s = NULL;
1965 ssize_t len;
1966 int slen;
1967 struct stat sb;
1968
1969 /* check for stdout/stdin */
1970 if (path[0] == '-' && path[1] == '\0') {
1971 if (dflag)
1972 handle_stdin();
1973 else
1974 handle_stdout();
1975 return;
1976 }
1977
1978 retry:
1979 if (stat(path, &sb) != 0) {
1980 /* lets try <path>.gz if we're decompressing */
1981 if (dflag && s == NULL && errno == ENOENT) {
1982 len = strlen(path);
1983 slen = suffixes[0].ziplen;
1984 s = malloc(len + slen + 1);
1985 if (s == NULL)
1986 maybe_err("malloc");
1987 memcpy(s, path, len);
1988 memcpy(s + len, suffixes[0].zipped, slen + 1);
1989 path = s;
1990 goto retry;
1991 }
1992 maybe_warn("can't stat: %s", opath);
1993 goto out;
1994 }
1995
1996 if (S_ISDIR(sb.st_mode)) {
1997 #ifndef SMALL
1998 if (rflag)
1999 handle_dir(path);
2000 else
2001 #endif
2002 maybe_warnx("%s is a directory", path);
2003 goto out;
2004 }
2005
2006 if (S_ISREG(sb.st_mode))
2007 handle_file(path, &sb);
2008 else
2009 maybe_warnx("%s is not a regular file", path);
2010
2011 out:
2012 if (s)
2013 free(s);
2014 }
2015
2016 /* compress/decompress a file */
2017 static void
handle_file(char * file,struct stat * sbp)2018 handle_file(char *file, struct stat *sbp)
2019 {
2020 off_t usize, gsize;
2021 char outfile[PATH_MAX];
2022
2023 infile_set(file, sbp->st_size);
2024 if (dflag) {
2025 usize = file_uncompress(file, outfile, sizeof(outfile));
2026 #ifndef SMALL
2027 if (vflag && tflag)
2028 print_test(file, usize != -1);
2029 #endif
2030 if (usize == -1)
2031 return;
2032 gsize = sbp->st_size;
2033 } else {
2034 gsize = file_compress(file, outfile, sizeof(outfile));
2035 if (gsize == -1)
2036 return;
2037 usize = sbp->st_size;
2038 }
2039 infile_clear();
2040
2041 #ifndef SMALL
2042 if (vflag && !tflag)
2043 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
2044 #endif
2045 }
2046
2047 #ifndef SMALL
2048 /* this is used with -r to recursively descend directories */
2049 static void
handle_dir(char * dir)2050 handle_dir(char *dir)
2051 {
2052 char *path_argv[2];
2053 FTS *fts;
2054 FTSENT *entry;
2055
2056 path_argv[0] = dir;
2057 path_argv[1] = 0;
2058 fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
2059 if (fts == NULL) {
2060 warn("couldn't fts_open %s", dir);
2061 return;
2062 }
2063
2064 while ((entry = fts_read(fts))) {
2065 switch(entry->fts_info) {
2066 case FTS_D:
2067 case FTS_DP:
2068 continue;
2069
2070 case FTS_DNR:
2071 case FTS_ERR:
2072 case FTS_NS:
2073 maybe_warn("%s", entry->fts_path);
2074 continue;
2075 case FTS_F:
2076 handle_file(entry->fts_path, entry->fts_statp);
2077 }
2078 }
2079 (void)fts_close(fts);
2080 }
2081 #endif
2082
2083 /* print a ratio - size reduction as a fraction of uncompressed size */
2084 static void
print_ratio(off_t in,off_t out,FILE * where)2085 print_ratio(off_t in, off_t out, FILE *where)
2086 {
2087 int percent10; /* 10 * percent */
2088 off_t diff;
2089 char buff[8];
2090 int len;
2091
2092 diff = in - out/2;
2093 if (in == 0 && out == 0)
2094 percent10 = 0;
2095 else if (diff < 0)
2096 /*
2097 * Output is more than double size of input! print -99.9%
2098 * Quite possibly we've failed to get the original size.
2099 */
2100 percent10 = -999;
2101 else {
2102 /*
2103 * We only need 12 bits of result from the final division,
2104 * so reduce the values until a 32bit division will suffice.
2105 */
2106 while (in > 0x100000) {
2107 diff >>= 1;
2108 in >>= 1;
2109 }
2110 if (in != 0)
2111 percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
2112 else
2113 percent10 = 0;
2114 }
2115
2116 len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
2117 /* Move the '.' to before the last digit */
2118 buff[len - 1] = buff[len - 2];
2119 buff[len - 2] = '.';
2120 fprintf(where, "%5s%%", buff);
2121 }
2122
2123 #ifndef SMALL
2124 /* print compression statistics, and the new name (if there is one!) */
2125 static void
print_verbage(const char * file,const char * nfile,off_t usize,off_t gsize)2126 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
2127 {
2128 if (file)
2129 fprintf(stderr, "%s:%s ", file,
2130 strlen(file) < 7 ? "\t\t" : "\t");
2131 print_ratio(usize, gsize, stderr);
2132 if (nfile)
2133 fprintf(stderr, " -- replaced with %s", nfile);
2134 fprintf(stderr, "\n");
2135 fflush(stderr);
2136 }
2137
2138 /* print test results */
2139 static void
print_test(const char * file,int ok)2140 print_test(const char *file, int ok)
2141 {
2142
2143 if (exit_value == 0 && ok == 0)
2144 exit_value = 1;
2145 fprintf(stderr, "%s:%s %s\n", file,
2146 strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
2147 fflush(stderr);
2148 }
2149 #endif
2150
2151 /* print a file's info ala --list */
2152 /* eg:
2153 compressed uncompressed ratio uncompressed_name
2154 354841 1679360 78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
2155 */
2156 static void
print_list(int fd,off_t out,const char * outfile,time_t ts)2157 print_list(int fd, off_t out, const char *outfile, time_t ts)
2158 {
2159 static int first = 1;
2160 #ifndef SMALL
2161 static off_t in_tot, out_tot;
2162 uint32_t crc = 0;
2163 #endif
2164 off_t in = 0, rv;
2165
2166 if (first) {
2167 #ifndef SMALL
2168 if (vflag)
2169 printf("method crc date time ");
2170 #endif
2171 if (qflag == 0)
2172 printf(" compressed uncompressed "
2173 "ratio uncompressed_name\n");
2174 }
2175 first = 0;
2176
2177 /* print totals? */
2178 #ifndef SMALL
2179 if (fd == -1) {
2180 in = in_tot;
2181 out = out_tot;
2182 } else
2183 #endif
2184 {
2185 /* read the last 4 bytes - this is the uncompressed size */
2186 rv = lseek(fd, (off_t)(-8), SEEK_END);
2187 if (rv != -1) {
2188 unsigned char buf[8];
2189 uint32_t usize;
2190
2191 rv = read(fd, (char *)buf, sizeof(buf));
2192 if (rv == -1)
2193 maybe_warn("read of uncompressed size");
2194 else if (rv != sizeof(buf))
2195 maybe_warnx("read of uncompressed size");
2196
2197 else {
2198 usize = buf[4];
2199 usize |= (unsigned int)buf[5] << 8;
2200 usize |= (unsigned int)buf[6] << 16;
2201 usize |= (unsigned int)buf[7] << 24;
2202 in = (off_t)usize;
2203 #ifndef SMALL
2204 crc = buf[0];
2205 crc |= (unsigned int)buf[1] << 8;
2206 crc |= (unsigned int)buf[2] << 16;
2207 crc |= (unsigned int)buf[3] << 24;
2208 #endif
2209 }
2210 }
2211 }
2212
2213 #ifndef SMALL
2214 if (vflag && fd == -1)
2215 printf(" ");
2216 else if (vflag) {
2217 char *date = ctime(&ts);
2218
2219 /* skip the day, 1/100th second, and year */
2220 date += 4;
2221 date[12] = 0;
2222 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
2223 }
2224 in_tot += in;
2225 out_tot += out;
2226 #endif
2227 print_list_out(out, in, outfile);
2228 }
2229
2230 static void
print_list_out(off_t out,off_t in,const char * outfile)2231 print_list_out(off_t out, off_t in, const char *outfile)
2232 {
2233 printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
2234 print_ratio(in, out, stdout);
2235 printf(" %s\n", outfile);
2236 }
2237
2238 /* display the usage of NetBSD gzip */
2239 static void
usage(void)2240 usage(void)
2241 {
2242
2243 fprintf(stderr, "%s\n", gzip_version);
2244 fprintf(stderr,
2245 "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n"
2246 #ifndef SMALL
2247 " -1 --fast fastest (worst) compression\n"
2248 " -2 .. -8 set compression level\n"
2249 " -9 --best best (slowest) compression\n"
2250 " -c --stdout write to stdout, keep original files\n"
2251 " --to-stdout\n"
2252 " -d --decompress uncompress files\n"
2253 " --uncompress\n"
2254 " -f --force force overwriting & compress links\n"
2255 " -h --help display this help\n"
2256 " -k --keep don't delete input files during operation\n"
2257 " -l --list list compressed file contents\n"
2258 " -N --name save or restore original file name and time stamp\n"
2259 " -n --no-name don't save original file name or time stamp\n"
2260 " -q --quiet output no warnings\n"
2261 " -r --recursive recursively compress files in directories\n"
2262 " -S .suf use suffix .suf instead of .gz\n"
2263 " --suffix .suf\n"
2264 " -t --test test compressed file\n"
2265 " -V --version display program version\n"
2266 " -v --verbose print extra statistics\n",
2267 #else
2268 ,
2269 #endif
2270 getprogname());
2271 exit(0);
2272 }
2273
2274 /* display the version of NetBSD gzip */
2275 static void
display_version(void)2276 display_version(void)
2277 {
2278
2279 fprintf(stderr, "%s\n", gzip_version);
2280 exit(0);
2281 }
2282
2283 #ifndef NO_BZIP2_SUPPORT
2284 #include "unbzip2.c"
2285 #endif
2286 #ifndef NO_COMPRESS_SUPPORT
2287 #include "zuncompress.c"
2288 #endif
2289 #ifndef NO_PACK_SUPPORT
2290 #include "unpack.c"
2291 #endif
2292 #ifndef NO_XZ_SUPPORT
2293 #include "unxz.c"
2294 #endif
2295 #ifndef NO_LZ_SUPPORT
2296 #include "unlz.c"
2297 #endif
2298
2299 static ssize_t
read_retry(int fd,void * buf,size_t sz)2300 read_retry(int fd, void *buf, size_t sz)
2301 {
2302 char *cp = buf;
2303 size_t left = MIN(sz, (size_t) SSIZE_MAX);
2304
2305 while (left > 0) {
2306 ssize_t ret;
2307
2308 ret = read(fd, cp, left);
2309 if (ret == -1) {
2310 return ret;
2311 } else if (ret == 0) {
2312 break; /* EOF */
2313 }
2314 cp += ret;
2315 left -= ret;
2316 }
2317
2318 return sz - left;
2319 }
2320
2321 static ssize_t
write_retry(int fd,const void * buf,size_t sz)2322 write_retry(int fd, const void *buf, size_t sz)
2323 {
2324 const char *cp = buf;
2325 size_t left = MIN(sz, (size_t) SSIZE_MAX);
2326
2327 while (left > 0) {
2328 ssize_t ret;
2329
2330 ret = write(fd, cp, left);
2331 if (ret == -1) {
2332 return ret;
2333 } else if (ret == 0) {
2334 abort(); /* Can't happen */
2335 }
2336 cp += ret;
2337 left -= ret;
2338 }
2339
2340 return sz - left;
2341 }
2342