1 /* $NetBSD: gzip.c,v 1.116 2018/10/27 11:39:12 skrll Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-2-Clause
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 #endif /* not lint */
38
39 /*
40 * gzip.c -- GPL free gzip using zlib.
41 *
42 * RFC 1950 covers the zlib format
43 * RFC 1951 covers the deflate format
44 * RFC 1952 covers the gzip format
45 *
46 * TODO:
47 * - use mmap where possible
48 * - make bzip2/compress -v/-t/-l support work as well as possible
49 */
50
51 #include <sys/endian.h>
52 #include <sys/param.h>
53 #include <sys/stat.h>
54 #include <sys/time.h>
55
56 #include <inttypes.h>
57 #include <unistd.h>
58 #include <stdio.h>
59 #include <string.h>
60 #include <stdlib.h>
61 #include <err.h>
62 #include <errno.h>
63 #include <fcntl.h>
64 #include <zlib.h>
65 #include <fts.h>
66 #include <libgen.h>
67 #include <stdarg.h>
68 #include <getopt.h>
69 #include <time.h>
70
71 /* what type of file are we dealing with */
72 enum filetype {
73 FT_GZIP,
74 #ifndef NO_BZIP2_SUPPORT
75 FT_BZIP2,
76 #endif
77 #ifndef NO_COMPRESS_SUPPORT
78 FT_Z,
79 #endif
80 #ifndef NO_PACK_SUPPORT
81 FT_PACK,
82 #endif
83 #ifndef NO_XZ_SUPPORT
84 FT_XZ,
85 #endif
86 #ifndef NO_LZ_SUPPORT
87 FT_LZ,
88 #endif
89 #ifndef NO_ZSTD_SUPPORT
90 FT_ZSTD,
91 #endif
92 FT_LAST,
93 FT_UNKNOWN
94 };
95
96 #ifndef NO_BZIP2_SUPPORT
97 #include <bzlib.h>
98
99 #define BZ2_SUFFIX ".bz2"
100 #define BZIP2_MAGIC "BZh"
101 #endif
102
103 #ifndef NO_COMPRESS_SUPPORT
104 #define Z_SUFFIX ".Z"
105 #define Z_MAGIC "\037\235"
106 #endif
107
108 #ifndef NO_PACK_SUPPORT
109 #define PACK_MAGIC "\037\036"
110 #endif
111
112 #ifndef NO_XZ_SUPPORT
113 #include <lzma.h>
114 #define XZ_SUFFIX ".xz"
115 #define XZ_MAGIC "\3757zXZ"
116 #endif
117
118 #ifndef NO_LZ_SUPPORT
119 #define LZ_SUFFIX ".lz"
120 #define LZ_MAGIC "LZIP"
121 #endif
122
123 #ifndef NO_ZSTD_SUPPORT
124 #include <zstd.h>
125 #define ZSTD_SUFFIX ".zst"
126 #define ZSTD_MAGIC "\050\265\057\375"
127 #endif
128
129 #define GZ_SUFFIX ".gz"
130
131 #define BUFLEN (64 * 1024)
132
133 #define GZIP_MAGIC0 0x1F
134 #define GZIP_MAGIC1 0x8B
135 #define GZIP_OMAGIC1 0x9E
136
137 #define GZIP_TIMESTAMP (off_t)4
138 #define GZIP_ORIGNAME (off_t)10
139
140 #define HEAD_CRC 0x02
141 #define EXTRA_FIELD 0x04
142 #define ORIG_NAME 0x08
143 #define COMMENT 0x10
144
145 #define OS_CODE 3 /* Unix */
146
147 typedef struct {
148 const char *zipped;
149 int ziplen;
150 const char *normal; /* for unzip - must not be longer than zipped */
151 } suffixes_t;
152 static suffixes_t suffixes[] = {
153 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N}
154 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S .xxx */
155 SUFFIX(GZ_SUFFIX, ""),
156 SUFFIX(".z", ""),
157 SUFFIX("-gz", ""),
158 SUFFIX("-z", ""),
159 SUFFIX("_z", ""),
160 SUFFIX(".taz", ".tar"),
161 SUFFIX(".tgz", ".tar"),
162 #ifndef NO_BZIP2_SUPPORT
163 SUFFIX(BZ2_SUFFIX, ""),
164 SUFFIX(".tbz", ".tar"),
165 SUFFIX(".tbz2", ".tar"),
166 #endif
167 #ifndef NO_COMPRESS_SUPPORT
168 SUFFIX(Z_SUFFIX, ""),
169 #endif
170 #ifndef NO_XZ_SUPPORT
171 SUFFIX(XZ_SUFFIX, ""),
172 #endif
173 #ifndef NO_LZ_SUPPORT
174 SUFFIX(LZ_SUFFIX, ""),
175 #endif
176 #ifndef NO_ZSTD_SUPPORT
177 SUFFIX(ZSTD_SUFFIX, ""),
178 #endif
179 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S "" */
180 #undef SUFFIX
181 };
182 #define NUM_SUFFIXES (nitems(suffixes))
183 #define SUFFIX_MAXLEN 30
184
185 static const char gzip_version[] = "FreeBSD gzip 20190107";
186
187 static const char gzip_copyright[] = \
188 " Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n"
189 " All rights reserved.\n"
190 "\n"
191 " Redistribution and use in source and binary forms, with or without\n"
192 " modification, are permitted provided that the following conditions\n"
193 " are met:\n"
194 " 1. Redistributions of source code must retain the above copyright\n"
195 " notice, this list of conditions and the following disclaimer.\n"
196 " 2. Redistributions in binary form must reproduce the above copyright\n"
197 " notice, this list of conditions and the following disclaimer in the\n"
198 " documentation and/or other materials provided with the distribution.\n"
199 "\n"
200 " THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n"
201 " IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n"
202 " OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n"
203 " IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n"
204 " INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n"
205 " BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n"
206 " LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n"
207 " AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n"
208 " OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n"
209 " OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n"
210 " SUCH DAMAGE.";
211
212 static int cflag; /* stdout mode */
213 static int dflag; /* decompress mode */
214 static int lflag; /* list mode */
215 static int numflag = 6; /* gzip -1..-9 value */
216
217 static const char *remove_file = NULL; /* file to be removed upon SIGINT */
218
219 static int fflag; /* force mode */
220 static int kflag; /* don't delete input files */
221 static int nflag; /* don't save name/timestamp */
222 static int Nflag; /* don't restore name/timestamp */
223 static int qflag; /* quiet mode */
224 static int rflag; /* recursive mode */
225 static int tflag; /* test */
226 static int vflag; /* verbose mode */
227 static sig_atomic_t print_info = 0;
228
229 static int exit_value = 0; /* exit value */
230
231 static const char *infile; /* name of file coming in */
232
233 static void maybe_err(const char *fmt, ...) __printflike(1, 2) __dead2;
234 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) || \
235 !defined(NO_XZ_SUPPORT) || !defined(NO_ZSTD_SUPPORT)
236 static void maybe_errx(const char *fmt, ...) __printflike(1, 2) __dead2;
237 #endif
238 static void maybe_warn(const char *fmt, ...) __printflike(1, 2);
239 static void maybe_warnx(const char *fmt, ...) __printflike(1, 2);
240 static enum filetype file_gettype(u_char *);
241 static off_t gz_compress(int, int, off_t *, const char *, uint32_t);
242 static off_t gz_uncompress(int, int, char *, size_t, off_t *, const char *);
243 static off_t file_compress(char *, char *, size_t);
244 static off_t file_uncompress(char *, char *, size_t);
245 static void handle_pathname(char *);
246 static void handle_file(char *, struct stat *);
247 static void handle_stdin(void);
248 static void handle_stdout(void);
249 static void print_ratio(off_t, off_t, FILE *);
250 static void print_list(int fd, off_t, const char *, time_t);
251 static void usage(void) __dead2;
252 static void display_version(void) __dead2;
253 static void display_license(void);
254 static const suffixes_t *check_suffix(char *, int);
255 static ssize_t read_retry(int, void *, size_t);
256 static ssize_t write_retry(int, const void *, size_t);
257 static void print_list_out(off_t, off_t, const char*);
258
259 static void infile_set(const char *newinfile, off_t total);
260
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
276 #ifndef NO_BZIP2_SUPPORT
277 static off_t unbzip2(int, int, char *, size_t, off_t *);
278 #endif
279
280 #ifndef NO_COMPRESS_SUPPORT
281 static FILE *zdopen(int);
282 static off_t zuncompress(FILE *, FILE *, char *, size_t, off_t *);
283 #endif
284
285 #ifndef NO_PACK_SUPPORT
286 static off_t unpack(int, int, char *, size_t, off_t *);
287 #endif
288
289 #ifndef NO_XZ_SUPPORT
290 static off_t unxz(int, int, char *, size_t, off_t *);
291 static off_t unxz_len(int);
292 #endif
293
294 #ifndef NO_LZ_SUPPORT
295 static off_t unlz(int, int, char *, size_t, off_t *);
296 #endif
297
298 #ifndef NO_ZSTD_SUPPORT
299 static off_t unzstd(int, int, char *, size_t, off_t *);
300 #endif
301
302 static const struct option longopts[] = {
303 { "stdout", no_argument, 0, 'c' },
304 { "to-stdout", no_argument, 0, 'c' },
305 { "decompress", no_argument, 0, 'd' },
306 { "uncompress", no_argument, 0, 'd' },
307 { "force", no_argument, 0, 'f' },
308 { "help", no_argument, 0, 'h' },
309 { "keep", no_argument, 0, 'k' },
310 { "list", no_argument, 0, 'l' },
311 { "no-name", no_argument, 0, 'n' },
312 { "name", no_argument, 0, 'N' },
313 { "quiet", no_argument, 0, 'q' },
314 { "recursive", no_argument, 0, 'r' },
315 { "suffix", required_argument, 0, 'S' },
316 { "test", no_argument, 0, 't' },
317 { "verbose", no_argument, 0, 'v' },
318 { "version", no_argument, 0, 'V' },
319 { "fast", no_argument, 0, '1' },
320 { "best", no_argument, 0, '9' },
321 { "ascii", no_argument, 0, 'a' },
322 { "license", no_argument, 0, 'L' },
323 { NULL, no_argument, 0, 0 },
324 };
325
326 int
main(int argc,char ** argv)327 main(int argc, char **argv)
328 {
329 const char *progname = getprogname();
330 char *gzip;
331 int len;
332 int ch;
333
334 setup_signals();
335
336 if ((gzip = getenv("GZIP")) != NULL)
337 prepend_gzip(gzip, &argc, &argv);
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 #define OPT_LIST "123456789acdfhklLNnqrS:tVv"
350
351 while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
352 switch (ch) {
353 case '1': case '2': case '3':
354 case '4': case '5': case '6':
355 case '7': case '8': case '9':
356 numflag = ch - '0';
357 break;
358 case 'c':
359 cflag = 1;
360 break;
361 case 'd':
362 dflag = 1;
363 break;
364 case 'l':
365 lflag = 1;
366 dflag = 1;
367 break;
368 case 'V':
369 display_version();
370 /* NOTREACHED */
371 case 'a':
372 fprintf(stderr, "%s: option --ascii ignored on this system\n", progname);
373 break;
374 case 'f':
375 fflag = 1;
376 break;
377 case 'k':
378 kflag = 1;
379 break;
380 case 'L':
381 display_license();
382 /* NOT REACHED */
383 case 'N':
384 nflag = 0;
385 Nflag = 1;
386 break;
387 case 'n':
388 nflag = 1;
389 Nflag = 0;
390 break;
391 case 'q':
392 qflag = 1;
393 break;
394 case 'r':
395 rflag = 1;
396 break;
397 case 'S':
398 len = strlen(optarg);
399 if (len != 0) {
400 if (len > SUFFIX_MAXLEN)
401 errx(1, "incorrect suffix: '%s': too long", optarg);
402 suffixes[0].zipped = optarg;
403 suffixes[0].ziplen = len;
404 } else {
405 suffixes[NUM_SUFFIXES - 1].zipped = "";
406 suffixes[NUM_SUFFIXES - 1].ziplen = 0;
407 }
408 break;
409 case 't':
410 cflag = 1;
411 tflag = 1;
412 dflag = 1;
413 break;
414 case 'v':
415 vflag = 1;
416 break;
417 default:
418 usage();
419 /* NOTREACHED */
420 }
421 }
422 argv += optind;
423 argc -= optind;
424
425 if (argc == 0) {
426 if (dflag) /* stdin mode */
427 handle_stdin();
428 else /* stdout mode */
429 handle_stdout();
430 } else {
431 do {
432 handle_pathname(argv[0]);
433 } while (*++argv);
434 }
435 if (qflag == 0 && lflag && argc > 1)
436 print_list(-1, 0, "(totals)", 0);
437 exit(exit_value);
438 }
439
440 /* maybe print a warning */
441 void
maybe_warn(const char * fmt,...)442 maybe_warn(const char *fmt, ...)
443 {
444 va_list ap;
445
446 if (qflag == 0) {
447 va_start(ap, fmt);
448 vwarn(fmt, ap);
449 va_end(ap);
450 }
451 if (exit_value == 0)
452 exit_value = 1;
453 }
454
455 /* ... without an errno. */
456 void
maybe_warnx(const char * fmt,...)457 maybe_warnx(const char *fmt, ...)
458 {
459 va_list ap;
460
461 if (qflag == 0) {
462 va_start(ap, fmt);
463 vwarnx(fmt, ap);
464 va_end(ap);
465 }
466 if (exit_value == 0)
467 exit_value = 1;
468 }
469
470 /* maybe print an error */
471 void
maybe_err(const char * fmt,...)472 maybe_err(const char *fmt, ...)
473 {
474 va_list ap;
475
476 if (qflag == 0) {
477 va_start(ap, fmt);
478 vwarn(fmt, ap);
479 va_end(ap);
480 }
481 exit(2);
482 }
483
484 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) || \
485 !defined(NO_XZ_SUPPORT) || !defined(NO_ZSTD_SUPPORT)
486 /* ... without an errno. */
487 void
maybe_errx(const char * fmt,...)488 maybe_errx(const char *fmt, ...)
489 {
490 va_list ap;
491
492 if (qflag == 0) {
493 va_start(ap, fmt);
494 vwarnx(fmt, ap);
495 va_end(ap);
496 }
497 exit(2);
498 }
499 #endif
500
501 /* split up $GZIP and prepend it to the argument list */
502 static void
prepend_gzip(char * gzip,int * argc,char *** argv)503 prepend_gzip(char *gzip, int *argc, char ***argv)
504 {
505 char *s, **nargv, **ac;
506 int nenvarg = 0, i;
507
508 /* scan how many arguments there are */
509 for (s = gzip;;) {
510 while (*s == ' ' || *s == '\t')
511 s++;
512 if (*s == 0)
513 goto count_done;
514 nenvarg++;
515 while (*s != ' ' && *s != '\t')
516 if (*s++ == 0)
517 goto count_done;
518 }
519 count_done:
520 /* punt early */
521 if (nenvarg == 0)
522 return;
523
524 *argc += nenvarg;
525 ac = *argv;
526
527 nargv = (char **)malloc((*argc + 1) * sizeof(char *));
528 if (nargv == NULL)
529 maybe_err("malloc");
530
531 /* stash this away */
532 *argv = nargv;
533
534 /* copy the program name first */
535 i = 0;
536 nargv[i++] = *(ac++);
537
538 /* take a copy of $GZIP and add it to the array */
539 s = strdup(gzip);
540 if (s == NULL)
541 maybe_err("strdup");
542 for (;;) {
543 /* Skip whitespaces. */
544 while (*s == ' ' || *s == '\t')
545 s++;
546 if (*s == 0)
547 goto copy_done;
548 nargv[i++] = s;
549 /* Find the end of this argument. */
550 while (*s != ' ' && *s != '\t')
551 if (*s++ == 0)
552 /* Argument followed by NUL. */
553 goto copy_done;
554 /* Terminate by overwriting ' ' or '\t' with NUL. */
555 *s++ = 0;
556 }
557 copy_done:
558
559 /* copy the original arguments and a NULL */
560 while (*ac)
561 nargv[i++] = *(ac++);
562 nargv[i] = NULL;
563 }
564
565 /* compress input to output. Return bytes read, -1 on error */
566 static off_t
gz_compress(int in,int out,off_t * gsizep,const char * origname,uint32_t mtime)567 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
568 {
569 z_stream z;
570 char *outbufp, *inbufp;
571 off_t in_tot = 0, out_tot = 0;
572 ssize_t in_size;
573 int i, error;
574 uLong crc;
575
576 outbufp = malloc(BUFLEN);
577 inbufp = malloc(BUFLEN);
578 if (outbufp == NULL || inbufp == NULL) {
579 maybe_err("malloc failed");
580 goto out;
581 }
582
583 memset(&z, 0, sizeof z);
584 z.zalloc = Z_NULL;
585 z.zfree = Z_NULL;
586 z.opaque = 0;
587
588 if (nflag != 0) {
589 mtime = 0;
590 origname = "";
591 }
592
593 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
594 GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
595 *origname ? ORIG_NAME : 0,
596 mtime & 0xff,
597 (mtime >> 8) & 0xff,
598 (mtime >> 16) & 0xff,
599 (mtime >> 24) & 0xff,
600 numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
601 OS_CODE, origname);
602 if (i >= BUFLEN)
603 /* this need PATH_MAX > BUFLEN ... */
604 maybe_err("snprintf");
605 if (*origname)
606 i++;
607
608 z.next_out = (unsigned char *)outbufp + i;
609 z.avail_out = BUFLEN - i;
610
611 error = deflateInit2(&z, numflag, Z_DEFLATED,
612 (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY);
613 if (error != Z_OK) {
614 maybe_warnx("deflateInit2 failed");
615 in_tot = -1;
616 goto out;
617 }
618
619 crc = crc32(0L, Z_NULL, 0);
620 for (;;) {
621 if (z.avail_out == 0) {
622 if (write_retry(out, outbufp, BUFLEN) != BUFLEN) {
623 maybe_warn("write");
624 out_tot = -1;
625 goto out;
626 }
627
628 out_tot += BUFLEN;
629 z.next_out = (unsigned char *)outbufp;
630 z.avail_out = BUFLEN;
631 }
632
633 if (z.avail_in == 0) {
634 in_size = read(in, inbufp, BUFLEN);
635 if (in_size < 0) {
636 maybe_warn("read");
637 in_tot = -1;
638 goto out;
639 }
640 if (in_size == 0)
641 break;
642 infile_newdata(in_size);
643
644 crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
645 in_tot += in_size;
646 z.next_in = (unsigned char *)inbufp;
647 z.avail_in = in_size;
648 }
649
650 error = deflate(&z, Z_NO_FLUSH);
651 if (error != Z_OK && error != Z_STREAM_END) {
652 maybe_warnx("deflate failed");
653 in_tot = -1;
654 goto out;
655 }
656 }
657
658 /* clean up */
659 for (;;) {
660 size_t len;
661 ssize_t w;
662
663 error = deflate(&z, Z_FINISH);
664 if (error != Z_OK && error != Z_STREAM_END) {
665 maybe_warnx("deflate failed");
666 in_tot = -1;
667 goto out;
668 }
669
670 len = (char *)z.next_out - outbufp;
671
672 w = write_retry(out, outbufp, len);
673 if (w == -1 || (size_t)w != len) {
674 maybe_warn("write");
675 out_tot = -1;
676 goto out;
677 }
678 out_tot += len;
679 z.next_out = (unsigned char *)outbufp;
680 z.avail_out = BUFLEN;
681
682 if (error == Z_STREAM_END)
683 break;
684 }
685
686 if (deflateEnd(&z) != Z_OK) {
687 maybe_warnx("deflateEnd failed");
688 in_tot = -1;
689 goto out;
690 }
691
692 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
693 (int)crc & 0xff,
694 (int)(crc >> 8) & 0xff,
695 (int)(crc >> 16) & 0xff,
696 (int)(crc >> 24) & 0xff,
697 (int)in_tot & 0xff,
698 (int)(in_tot >> 8) & 0xff,
699 (int)(in_tot >> 16) & 0xff,
700 (int)(in_tot >> 24) & 0xff);
701 if (i != 8)
702 maybe_err("snprintf");
703 if (write_retry(out, outbufp, i) != i) {
704 maybe_warn("write");
705 in_tot = -1;
706 } else
707 out_tot += i;
708
709 out:
710 if (inbufp != NULL)
711 free(inbufp);
712 if (outbufp != NULL)
713 free(outbufp);
714 if (gsizep)
715 *gsizep = out_tot;
716 return in_tot;
717 }
718
719 /*
720 * uncompress input to output then close the input. return the
721 * uncompressed size written, and put the compressed sized read
722 * into `*gsizep'.
723 */
724 static off_t
gz_uncompress(int in,int out,char * pre,size_t prelen,off_t * gsizep,const char * filename)725 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
726 const char *filename)
727 {
728 z_stream z;
729 char *outbufp, *inbufp;
730 off_t out_tot = -1, in_tot = 0;
731 uint32_t out_sub_tot = 0;
732 enum {
733 GZSTATE_MAGIC0,
734 GZSTATE_MAGIC1,
735 GZSTATE_METHOD,
736 GZSTATE_FLAGS,
737 GZSTATE_SKIPPING,
738 GZSTATE_EXTRA,
739 GZSTATE_EXTRA2,
740 GZSTATE_EXTRA3,
741 GZSTATE_ORIGNAME,
742 GZSTATE_COMMENT,
743 GZSTATE_HEAD_CRC1,
744 GZSTATE_HEAD_CRC2,
745 GZSTATE_INIT,
746 GZSTATE_READ,
747 GZSTATE_CRC,
748 GZSTATE_LEN,
749 } state = GZSTATE_MAGIC0;
750 int flags = 0, skip_count = 0;
751 int error = Z_STREAM_ERROR, done_reading = 0;
752 uLong crc = 0;
753 ssize_t wr;
754 int needmore = 0;
755
756 #define ADVANCE() { z.next_in++; z.avail_in--; }
757
758 if ((outbufp = malloc(BUFLEN)) == NULL) {
759 maybe_err("malloc failed");
760 goto out2;
761 }
762 if ((inbufp = malloc(BUFLEN)) == NULL) {
763 maybe_err("malloc failed");
764 goto out1;
765 }
766
767 memset(&z, 0, sizeof z);
768 z.avail_in = prelen;
769 z.next_in = (unsigned char *)pre;
770 z.avail_out = BUFLEN;
771 z.next_out = (unsigned char *)outbufp;
772 z.zalloc = NULL;
773 z.zfree = NULL;
774 z.opaque = 0;
775
776 in_tot = prelen;
777 out_tot = 0;
778
779 for (;;) {
780 check_siginfo();
781 if ((z.avail_in == 0 || needmore) && done_reading == 0) {
782 ssize_t in_size;
783
784 if (z.avail_in > 0) {
785 memmove(inbufp, z.next_in, z.avail_in);
786 }
787 z.next_in = (unsigned char *)inbufp;
788 in_size = read(in, z.next_in + z.avail_in,
789 BUFLEN - z.avail_in);
790
791 if (in_size == -1) {
792 maybe_warn("failed to read stdin");
793 goto stop_and_fail;
794 } else if (in_size == 0) {
795 done_reading = 1;
796 }
797 infile_newdata(in_size);
798
799 z.avail_in += in_size;
800 needmore = 0;
801
802 in_tot += in_size;
803 }
804 if (z.avail_in == 0) {
805 if (done_reading && state != GZSTATE_MAGIC0) {
806 maybe_warnx("%s: unexpected end of file",
807 filename);
808 goto stop_and_fail;
809 }
810 goto stop;
811 }
812 switch (state) {
813 case GZSTATE_MAGIC0:
814 if (*z.next_in != GZIP_MAGIC0) {
815 if (in_tot > 0) {
816 maybe_warnx("%s: trailing garbage "
817 "ignored", filename);
818 exit_value = 2;
819 goto stop;
820 }
821 maybe_warnx("input not gziped (MAGIC0)");
822 goto stop_and_fail;
823 }
824 ADVANCE();
825 state++;
826 out_sub_tot = 0;
827 crc = crc32(0L, Z_NULL, 0);
828 break;
829
830 case GZSTATE_MAGIC1:
831 if (*z.next_in != GZIP_MAGIC1 &&
832 *z.next_in != GZIP_OMAGIC1) {
833 maybe_warnx("input not gziped (MAGIC1)");
834 goto stop_and_fail;
835 }
836 ADVANCE();
837 state++;
838 break;
839
840 case GZSTATE_METHOD:
841 if (*z.next_in != Z_DEFLATED) {
842 maybe_warnx("unknown compression method");
843 goto stop_and_fail;
844 }
845 ADVANCE();
846 state++;
847 break;
848
849 case GZSTATE_FLAGS:
850 flags = *z.next_in;
851 ADVANCE();
852 skip_count = 6;
853 state++;
854 break;
855
856 case GZSTATE_SKIPPING:
857 if (skip_count > 0) {
858 skip_count--;
859 ADVANCE();
860 } else
861 state++;
862 break;
863
864 case GZSTATE_EXTRA:
865 if ((flags & EXTRA_FIELD) == 0) {
866 state = GZSTATE_ORIGNAME;
867 break;
868 }
869 skip_count = *z.next_in;
870 ADVANCE();
871 state++;
872 break;
873
874 case GZSTATE_EXTRA2:
875 skip_count |= ((*z.next_in) << 8);
876 ADVANCE();
877 state++;
878 break;
879
880 case GZSTATE_EXTRA3:
881 if (skip_count > 0) {
882 skip_count--;
883 ADVANCE();
884 } else
885 state++;
886 break;
887
888 case GZSTATE_ORIGNAME:
889 if ((flags & ORIG_NAME) == 0) {
890 state++;
891 break;
892 }
893 if (*z.next_in == 0)
894 state++;
895 ADVANCE();
896 break;
897
898 case GZSTATE_COMMENT:
899 if ((flags & COMMENT) == 0) {
900 state++;
901 break;
902 }
903 if (*z.next_in == 0)
904 state++;
905 ADVANCE();
906 break;
907
908 case GZSTATE_HEAD_CRC1:
909 if (flags & HEAD_CRC)
910 skip_count = 2;
911 else
912 skip_count = 0;
913 state++;
914 break;
915
916 case GZSTATE_HEAD_CRC2:
917 if (skip_count > 0) {
918 skip_count--;
919 ADVANCE();
920 } else
921 state++;
922 break;
923
924 case GZSTATE_INIT:
925 if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
926 maybe_warnx("failed to inflateInit");
927 goto stop_and_fail;
928 }
929 state++;
930 break;
931
932 case GZSTATE_READ:
933 error = inflate(&z, Z_FINISH);
934 switch (error) {
935 /* Z_BUF_ERROR goes with Z_FINISH... */
936 case Z_BUF_ERROR:
937 if (z.avail_out > 0 && !done_reading)
938 continue;
939
940 case Z_STREAM_END:
941 case Z_OK:
942 break;
943
944 case Z_NEED_DICT:
945 maybe_warnx("Z_NEED_DICT error");
946 goto stop_and_fail;
947 case Z_DATA_ERROR:
948 maybe_warnx("data stream error");
949 goto stop_and_fail;
950 case Z_STREAM_ERROR:
951 maybe_warnx("internal stream error");
952 goto stop_and_fail;
953 case Z_MEM_ERROR:
954 maybe_warnx("memory allocation error");
955 goto stop_and_fail;
956
957 default:
958 maybe_warn("unknown error from inflate(): %d",
959 error);
960 }
961 wr = BUFLEN - z.avail_out;
962
963 if (wr != 0) {
964 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
965 if (
966 /* don't write anything with -t */
967 tflag == 0 &&
968 write_retry(out, outbufp, wr) != wr) {
969 maybe_warn("error writing to output");
970 goto stop_and_fail;
971 }
972
973 out_tot += wr;
974 out_sub_tot += wr;
975 }
976
977 if (error == Z_STREAM_END) {
978 inflateEnd(&z);
979 state++;
980 }
981
982 z.next_out = (unsigned char *)outbufp;
983 z.avail_out = BUFLEN;
984
985 break;
986 case GZSTATE_CRC:
987 {
988 uLong origcrc;
989
990 if (z.avail_in < 4) {
991 if (!done_reading) {
992 needmore = 1;
993 continue;
994 }
995 maybe_warnx("truncated input");
996 goto stop_and_fail;
997 }
998 origcrc = le32dec(&z.next_in[0]);
999 if (origcrc != crc) {
1000 maybe_warnx("invalid compressed"
1001 " data--crc error");
1002 goto stop_and_fail;
1003 }
1004 }
1005
1006 z.avail_in -= 4;
1007 z.next_in += 4;
1008
1009 if (!z.avail_in && done_reading) {
1010 goto stop;
1011 }
1012 state++;
1013 break;
1014 case GZSTATE_LEN:
1015 {
1016 uLong origlen;
1017
1018 if (z.avail_in < 4) {
1019 if (!done_reading) {
1020 needmore = 1;
1021 continue;
1022 }
1023 maybe_warnx("truncated input");
1024 goto stop_and_fail;
1025 }
1026 origlen = le32dec(&z.next_in[0]);
1027
1028 if (origlen != out_sub_tot) {
1029 maybe_warnx("invalid compressed"
1030 " data--length error");
1031 goto stop_and_fail;
1032 }
1033 }
1034
1035 z.avail_in -= 4;
1036 z.next_in += 4;
1037
1038 if (error < 0) {
1039 maybe_warnx("decompression error");
1040 goto stop_and_fail;
1041 }
1042 state = GZSTATE_MAGIC0;
1043 break;
1044 }
1045 continue;
1046 stop_and_fail:
1047 out_tot = -1;
1048 stop:
1049 break;
1050 }
1051 if (state > GZSTATE_INIT)
1052 inflateEnd(&z);
1053
1054 free(inbufp);
1055 out1:
1056 free(outbufp);
1057 out2:
1058 if (gsizep)
1059 *gsizep = in_tot;
1060 return (out_tot);
1061 }
1062
1063 /*
1064 * set the owner, mode, flags & utimes using the given file descriptor.
1065 * file is only used in possible warning messages.
1066 */
1067 static void
copymodes(int fd,const struct stat * sbp,const char * file)1068 copymodes(int fd, const struct stat *sbp, const char *file)
1069 {
1070 struct timespec times[2];
1071 struct stat sb;
1072
1073 /*
1074 * If we have no info on the input, give this file some
1075 * default values and return..
1076 */
1077 if (sbp == NULL) {
1078 mode_t mask = umask(022);
1079
1080 (void)fchmod(fd, DEFFILEMODE & ~mask);
1081 (void)umask(mask);
1082 return;
1083 }
1084 sb = *sbp;
1085
1086 /* if the chown fails, remove set-id bits as-per compress(1) */
1087 if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
1088 if (errno != EPERM)
1089 maybe_warn("couldn't fchown: %s", file);
1090 sb.st_mode &= ~(S_ISUID|S_ISGID);
1091 }
1092
1093 /* we only allow set-id and the 9 normal permission bits */
1094 sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1095 if (fchmod(fd, sb.st_mode) < 0)
1096 maybe_warn("couldn't fchmod: %s", file);
1097
1098 times[0] = sb.st_atim;
1099 times[1] = sb.st_mtim;
1100 if (futimens(fd, times) < 0)
1101 maybe_warn("couldn't futimens: %s", file);
1102
1103 /* only try flags if they exist already */
1104 if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1105 maybe_warn("couldn't fchflags: %s", file);
1106 }
1107
1108 /* what sort of file is this? */
1109 static enum filetype
file_gettype(u_char * buf)1110 file_gettype(u_char *buf)
1111 {
1112
1113 if (buf[0] == GZIP_MAGIC0 &&
1114 (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1115 return FT_GZIP;
1116 #ifndef NO_BZIP2_SUPPORT
1117 else if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1118 buf[3] >= '0' && buf[3] <= '9')
1119 return FT_BZIP2;
1120 #endif
1121 #ifndef NO_COMPRESS_SUPPORT
1122 else if (memcmp(buf, Z_MAGIC, 2) == 0)
1123 return FT_Z;
1124 #endif
1125 #ifndef NO_PACK_SUPPORT
1126 else if (memcmp(buf, PACK_MAGIC, 2) == 0)
1127 return FT_PACK;
1128 #endif
1129 #ifndef NO_XZ_SUPPORT
1130 else if (memcmp(buf, XZ_MAGIC, 4) == 0) /* XXX: We only have 4 bytes */
1131 return FT_XZ;
1132 #endif
1133 #ifndef NO_LZ_SUPPORT
1134 else if (memcmp(buf, LZ_MAGIC, 4) == 0)
1135 return FT_LZ;
1136 #endif
1137 #ifndef NO_ZSTD_SUPPORT
1138 else if (memcmp(buf, ZSTD_MAGIC, 4) == 0)
1139 return FT_ZSTD;
1140 #endif
1141 else
1142 return FT_UNKNOWN;
1143 }
1144
1145 /* check the outfile is OK. */
1146 static int
check_outfile(const char * outfile)1147 check_outfile(const char *outfile)
1148 {
1149 struct stat sb;
1150 int ok = 1;
1151
1152 if (lflag == 0 && stat(outfile, &sb) == 0) {
1153 if (fflag)
1154 unlink(outfile);
1155 else if (isatty(STDIN_FILENO)) {
1156 char ans[10] = { 'n', '\0' }; /* default */
1157
1158 fprintf(stderr, "%s already exists -- do you wish to "
1159 "overwrite (y or n)? " , outfile);
1160 (void)fgets(ans, sizeof(ans) - 1, stdin);
1161 if (ans[0] != 'y' && ans[0] != 'Y') {
1162 fprintf(stderr, "\tnot overwriting\n");
1163 ok = 0;
1164 } else
1165 unlink(outfile);
1166 } else {
1167 maybe_warnx("%s already exists -- skipping", outfile);
1168 ok = 0;
1169 }
1170 }
1171 return ok;
1172 }
1173
1174 static void
unlink_input(const char * file,const struct stat * sb)1175 unlink_input(const char *file, const struct stat *sb)
1176 {
1177 struct stat nsb;
1178
1179 if (kflag)
1180 return;
1181 if (stat(file, &nsb) != 0)
1182 /* Must be gone already */
1183 return;
1184 if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1185 /* Definitely a different file */
1186 return;
1187 unlink(file);
1188 }
1189
1190 static void
got_sigint(int signo __unused)1191 got_sigint(int signo __unused)
1192 {
1193
1194 if (remove_file != NULL)
1195 unlink(remove_file);
1196 _exit(2);
1197 }
1198
1199 static void
got_siginfo(int signo __unused)1200 got_siginfo(int signo __unused)
1201 {
1202
1203 print_info = 1;
1204 }
1205
1206 static void
setup_signals(void)1207 setup_signals(void)
1208 {
1209
1210 signal(SIGINFO, got_siginfo);
1211 signal(SIGINT, got_sigint);
1212 }
1213
1214 static void
infile_newdata(size_t newdata)1215 infile_newdata(size_t newdata)
1216 {
1217
1218 infile_current += newdata;
1219 }
1220
1221 static void
infile_set(const char * newinfile,off_t total)1222 infile_set(const char *newinfile, off_t total)
1223 {
1224
1225 if (newinfile)
1226 infile = newinfile;
1227 infile_total = total;
1228 }
1229
1230 static void
infile_clear(void)1231 infile_clear(void)
1232 {
1233
1234 infile = NULL;
1235 infile_total = infile_current = 0;
1236 }
1237
1238 static const suffixes_t *
check_suffix(char * file,int xlate)1239 check_suffix(char *file, int xlate)
1240 {
1241 const suffixes_t *s;
1242 int len = strlen(file);
1243 char *sp;
1244
1245 for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1246 /* if it doesn't fit in "a.suf", don't bother */
1247 if (s->ziplen >= len)
1248 continue;
1249 sp = file + len - s->ziplen;
1250 if (strcmp(s->zipped, sp) != 0)
1251 continue;
1252 if (xlate)
1253 strcpy(sp, s->normal);
1254 return s;
1255 }
1256 return NULL;
1257 }
1258
1259 /*
1260 * compress the given file: create a corresponding .gz file and remove the
1261 * original.
1262 */
1263 static off_t
file_compress(char * file,char * outfile,size_t outsize)1264 file_compress(char *file, char *outfile, size_t outsize)
1265 {
1266 int in;
1267 int out;
1268 off_t size, in_size;
1269 struct stat isb, osb;
1270 const suffixes_t *suff;
1271
1272 in = open(file, O_RDONLY);
1273 if (in == -1) {
1274 maybe_warn("can't open %s", file);
1275 return (-1);
1276 }
1277
1278 if (fstat(in, &isb) != 0) {
1279 maybe_warn("couldn't stat: %s", file);
1280 close(in);
1281 return (-1);
1282 }
1283
1284 if (fstat(in, &isb) != 0) {
1285 close(in);
1286 maybe_warn("can't stat %s", file);
1287 return -1;
1288 }
1289 infile_set(file, isb.st_size);
1290
1291 if (cflag == 0) {
1292 if (isb.st_nlink > 1 && fflag == 0) {
1293 maybe_warnx("%s has %ju other link%s -- "
1294 "skipping", file,
1295 (uintmax_t)isb.st_nlink - 1,
1296 isb.st_nlink == 1 ? "" : "s");
1297 close(in);
1298 return -1;
1299 }
1300
1301 if (fflag == 0 && (suff = check_suffix(file, 0)) &&
1302 suff->zipped[0] != 0) {
1303 maybe_warnx("%s already has %s suffix -- unchanged",
1304 file, suff->zipped);
1305 close(in);
1306 return (-1);
1307 }
1308
1309 /* Add (usually) .gz to filename */
1310 if ((size_t)snprintf(outfile, outsize, "%s%s",
1311 file, suffixes[0].zipped) >= outsize)
1312 memcpy(outfile + outsize - suffixes[0].ziplen - 1,
1313 suffixes[0].zipped, suffixes[0].ziplen + 1);
1314
1315 if (check_outfile(outfile) == 0) {
1316 close(in);
1317 return (-1);
1318 }
1319 }
1320
1321 if (cflag == 0) {
1322 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1323 if (out == -1) {
1324 maybe_warn("could not create output: %s", outfile);
1325 fclose(stdin);
1326 return (-1);
1327 }
1328 remove_file = outfile;
1329 } else
1330 out = STDOUT_FILENO;
1331
1332 in_size = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1333
1334 (void)close(in);
1335
1336 /*
1337 * If there was an error, in_size will be -1.
1338 * If we compressed to stdout, just return the size.
1339 * Otherwise stat the file and check it is the correct size.
1340 * We only blow away the file if we can stat the output and it
1341 * has the expected size.
1342 */
1343 if (cflag != 0)
1344 return in_size == -1 ? -1 : size;
1345
1346 if (fstat(out, &osb) != 0) {
1347 maybe_warn("couldn't stat: %s", outfile);
1348 goto bad_outfile;
1349 }
1350
1351 if (osb.st_size != size) {
1352 maybe_warnx("output file: %s wrong size (%ju != %ju), deleting",
1353 outfile, (uintmax_t)osb.st_size, (uintmax_t)size);
1354 goto bad_outfile;
1355 }
1356
1357 copymodes(out, &isb, outfile);
1358 remove_file = NULL;
1359 if (close(out) == -1)
1360 maybe_warn("couldn't close output");
1361
1362 /* output is good, ok to delete input */
1363 unlink_input(file, &isb);
1364 return (size);
1365
1366 bad_outfile:
1367 if (close(out) == -1)
1368 maybe_warn("couldn't close output");
1369
1370 maybe_warnx("leaving original %s", file);
1371 unlink(outfile);
1372 return (size);
1373 }
1374
1375 /* uncompress the given file and remove the original */
1376 static off_t
file_uncompress(char * file,char * outfile,size_t outsize)1377 file_uncompress(char *file, char *outfile, size_t outsize)
1378 {
1379 struct stat isb, osb;
1380 off_t size;
1381 ssize_t rbytes;
1382 unsigned char fourbytes[4];
1383 enum filetype method;
1384 int fd, ofd, zfd = -1;
1385 int error;
1386 size_t in_size;
1387 ssize_t rv;
1388 time_t timestamp = 0;
1389 char name[PATH_MAX + 1];
1390
1391 /* gather the old name info */
1392
1393 fd = open(file, O_RDONLY);
1394 if (fd < 0) {
1395 maybe_warn("can't open %s", file);
1396 goto lose;
1397 }
1398 if (fstat(fd, &isb) != 0) {
1399 maybe_warn("can't stat %s", file);
1400 goto lose;
1401 }
1402 if (S_ISREG(isb.st_mode))
1403 in_size = isb.st_size;
1404 else
1405 in_size = 0;
1406 infile_set(file, in_size);
1407
1408 strlcpy(outfile, file, outsize);
1409 if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1410 maybe_warnx("%s: unknown suffix -- ignored", file);
1411 goto lose;
1412 }
1413
1414 rbytes = read(fd, fourbytes, sizeof fourbytes);
1415 if (rbytes != sizeof fourbytes) {
1416 /* we don't want to fail here. */
1417 if (fflag)
1418 goto lose;
1419 if (rbytes == -1)
1420 maybe_warn("can't read %s", file);
1421 else
1422 goto unexpected_EOF;
1423 goto lose;
1424 }
1425 infile_newdata(rbytes);
1426
1427 method = file_gettype(fourbytes);
1428 if (fflag == 0 && method == FT_UNKNOWN) {
1429 maybe_warnx("%s: not in gzip format", file);
1430 goto lose;
1431 }
1432
1433
1434 if (method == FT_GZIP && Nflag) {
1435 unsigned char ts[4]; /* timestamp */
1436
1437 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1438 if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1439 goto unexpected_EOF;
1440 if (rv == -1) {
1441 if (!fflag)
1442 maybe_warn("can't read %s", file);
1443 goto lose;
1444 }
1445 infile_newdata(rv);
1446 timestamp = le32dec(&ts[0]);
1447
1448 if (fourbytes[3] & ORIG_NAME) {
1449 rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME);
1450 if (rbytes < 0) {
1451 maybe_warn("can't read %s", file);
1452 goto lose;
1453 }
1454 if (name[0] != '\0') {
1455 char *dp, *nf;
1456
1457 /* Make sure that name is NUL-terminated */
1458 name[rbytes] = '\0';
1459
1460 /* strip saved directory name */
1461 nf = strrchr(name, '/');
1462 if (nf == NULL)
1463 nf = name;
1464 else
1465 nf++;
1466
1467 /* preserve original directory name */
1468 dp = strrchr(file, '/');
1469 if (dp == NULL)
1470 dp = file;
1471 else
1472 dp++;
1473 snprintf(outfile, outsize, "%.*s%.*s",
1474 (int) (dp - file),
1475 file, (int) rbytes, nf);
1476 }
1477 }
1478 }
1479 lseek(fd, 0, SEEK_SET);
1480
1481 if (cflag == 0 || lflag) {
1482 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1483 maybe_warnx("%s has %ju other links -- skipping",
1484 file, (uintmax_t)isb.st_nlink - 1);
1485 goto lose;
1486 }
1487 if (nflag == 0 && timestamp)
1488 isb.st_mtime = timestamp;
1489 if (check_outfile(outfile) == 0)
1490 goto lose;
1491 }
1492
1493 if (cflag)
1494 zfd = STDOUT_FILENO;
1495 else if (lflag)
1496 zfd = -1;
1497 else {
1498 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1499 if (zfd == STDOUT_FILENO) {
1500 /* We won't close STDOUT_FILENO later... */
1501 zfd = dup(zfd);
1502 close(STDOUT_FILENO);
1503 }
1504 if (zfd == -1) {
1505 maybe_warn("can't open %s", outfile);
1506 goto lose;
1507 }
1508 remove_file = outfile;
1509 }
1510
1511 switch (method) {
1512 #ifndef NO_BZIP2_SUPPORT
1513 case FT_BZIP2:
1514 /* XXX */
1515 if (lflag) {
1516 maybe_warnx("no -l with bzip2 files");
1517 goto lose;
1518 }
1519
1520 size = unbzip2(fd, zfd, NULL, 0, NULL);
1521 break;
1522 #endif
1523
1524 #ifndef NO_COMPRESS_SUPPORT
1525 case FT_Z: {
1526 FILE *in, *out;
1527
1528 /* XXX */
1529 if (lflag) {
1530 maybe_warnx("no -l with Lempel-Ziv files");
1531 goto lose;
1532 }
1533
1534 if ((in = zdopen(fd)) == NULL) {
1535 maybe_warn("zdopen for read: %s", file);
1536 goto lose;
1537 }
1538
1539 out = fdopen(dup(zfd), "w");
1540 if (out == NULL) {
1541 maybe_warn("fdopen for write: %s", outfile);
1542 fclose(in);
1543 goto lose;
1544 }
1545
1546 size = zuncompress(in, out, NULL, 0, NULL);
1547 /* need to fclose() if ferror() is true... */
1548 error = ferror(in);
1549 if (error | fclose(in)) {
1550 if (error)
1551 maybe_warn("failed infile");
1552 else
1553 maybe_warn("failed infile fclose");
1554 if (cflag == 0)
1555 unlink(outfile);
1556 (void)fclose(out);
1557 goto lose;
1558 }
1559 if (fclose(out) != 0) {
1560 maybe_warn("failed outfile fclose");
1561 if (cflag == 0)
1562 unlink(outfile);
1563 goto lose;
1564 }
1565 break;
1566 }
1567 #endif
1568
1569 #ifndef NO_PACK_SUPPORT
1570 case FT_PACK:
1571 if (lflag) {
1572 maybe_warnx("no -l with packed files");
1573 goto lose;
1574 }
1575
1576 size = unpack(fd, zfd, NULL, 0, NULL);
1577 break;
1578 #endif
1579
1580 #ifndef NO_XZ_SUPPORT
1581 case FT_XZ:
1582 if (lflag) {
1583 size = unxz_len(fd);
1584 if (!tflag) {
1585 print_list_out(in_size, size, file);
1586 close(fd);
1587 return -1;
1588 }
1589 } else
1590 size = unxz(fd, zfd, NULL, 0, NULL);
1591 break;
1592 #endif
1593
1594 #ifndef NO_LZ_SUPPORT
1595 case FT_LZ:
1596 if (lflag) {
1597 maybe_warnx("no -l with lzip files");
1598 goto lose;
1599 }
1600 size = unlz(fd, zfd, NULL, 0, NULL);
1601 break;
1602 #endif
1603
1604 #ifndef NO_ZSTD_SUPPORT
1605 case FT_ZSTD:
1606 if (lflag) {
1607 maybe_warnx("no -l with zstd files");
1608 goto lose;
1609 }
1610 size = unzstd(fd, zfd, NULL, 0, NULL);
1611 break;
1612 #endif
1613 case FT_UNKNOWN:
1614 if (lflag) {
1615 maybe_warnx("no -l for unknown filetypes");
1616 goto lose;
1617 }
1618 size = cat_fd(NULL, 0, NULL, fd);
1619 break;
1620 default:
1621 if (lflag) {
1622 print_list(fd, in_size, outfile, isb.st_mtime);
1623 if (!tflag) {
1624 close(fd);
1625 return -1; /* XXX */
1626 }
1627 }
1628
1629 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1630 break;
1631 }
1632
1633 if (close(fd) != 0)
1634 maybe_warn("couldn't close input");
1635 if (zfd != STDOUT_FILENO && close(zfd) != 0)
1636 maybe_warn("couldn't close output");
1637
1638 if (size == -1) {
1639 if (cflag == 0)
1640 unlink(outfile);
1641 maybe_warnx("%s: uncompress failed", file);
1642 return -1;
1643 }
1644
1645 /* if testing, or we uncompressed to stdout, this is all we need */
1646 if (tflag)
1647 return size;
1648 /* if we are uncompressing to stdin, don't remove the file. */
1649 if (cflag)
1650 return size;
1651
1652 /*
1653 * if we create a file...
1654 */
1655 /*
1656 * if we can't stat the file don't remove the file.
1657 */
1658
1659 ofd = open(outfile, O_RDWR, 0);
1660 if (ofd == -1) {
1661 maybe_warn("couldn't open (leaving original): %s",
1662 outfile);
1663 return -1;
1664 }
1665 if (fstat(ofd, &osb) != 0) {
1666 maybe_warn("couldn't stat (leaving original): %s",
1667 outfile);
1668 close(ofd);
1669 return -1;
1670 }
1671 if (osb.st_size != size) {
1672 maybe_warnx("stat gave different size: %ju != %ju (leaving original)",
1673 (uintmax_t)size, (uintmax_t)osb.st_size);
1674 close(ofd);
1675 unlink(outfile);
1676 return -1;
1677 }
1678 copymodes(ofd, &isb, outfile);
1679 remove_file = NULL;
1680 close(ofd);
1681 unlink_input(file, &isb);
1682 return size;
1683
1684 unexpected_EOF:
1685 maybe_warnx("%s: unexpected end of file", file);
1686 lose:
1687 if (fd != -1)
1688 close(fd);
1689 if (zfd != -1 && zfd != STDOUT_FILENO)
1690 close(zfd);
1691 return -1;
1692 }
1693
1694 static void
check_siginfo(void)1695 check_siginfo(void)
1696 {
1697 if (print_info == 0)
1698 return;
1699 if (infile) {
1700 if (infile_total) {
1701 int pcent = (int)((100.0 * infile_current) / infile_total);
1702
1703 fprintf(stderr, "%s: done %llu/%llu bytes %d%%\n",
1704 infile, (unsigned long long)infile_current,
1705 (unsigned long long)infile_total, pcent);
1706 } else
1707 fprintf(stderr, "%s: done %llu bytes\n",
1708 infile, (unsigned long long)infile_current);
1709 }
1710 print_info = 0;
1711 }
1712
1713 static off_t
cat_fd(unsigned char * prepend,size_t count,off_t * gsizep,int fd)1714 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1715 {
1716 char buf[BUFLEN];
1717 off_t in_tot;
1718 ssize_t w;
1719
1720 in_tot = count;
1721 w = write_retry(STDOUT_FILENO, prepend, count);
1722 if (w == -1 || (size_t)w != count) {
1723 maybe_warn("write to stdout");
1724 return -1;
1725 }
1726 for (;;) {
1727 ssize_t rv;
1728
1729 rv = read(fd, buf, sizeof buf);
1730 if (rv == 0)
1731 break;
1732 if (rv < 0) {
1733 maybe_warn("read from fd %d", fd);
1734 break;
1735 }
1736 infile_newdata(rv);
1737
1738 if (write_retry(STDOUT_FILENO, buf, rv) != rv) {
1739 maybe_warn("write to stdout");
1740 break;
1741 }
1742 in_tot += rv;
1743 }
1744
1745 if (gsizep)
1746 *gsizep = in_tot;
1747 return (in_tot);
1748 }
1749
1750 static void
handle_stdin(void)1751 handle_stdin(void)
1752 {
1753 struct stat isb;
1754 unsigned char fourbytes[4];
1755 size_t in_size;
1756 off_t usize, gsize;
1757 enum filetype method;
1758 ssize_t bytes_read;
1759 #ifndef NO_COMPRESS_SUPPORT
1760 FILE *in;
1761 #endif
1762
1763 if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1764 maybe_warnx("standard input is a terminal -- ignoring");
1765 goto out;
1766 }
1767
1768 if (fstat(STDIN_FILENO, &isb) < 0) {
1769 maybe_warn("fstat");
1770 goto out;
1771 }
1772 if (S_ISREG(isb.st_mode))
1773 in_size = isb.st_size;
1774 else
1775 in_size = 0;
1776 infile_set("(stdin)", in_size);
1777
1778 if (lflag) {
1779 print_list(STDIN_FILENO, in_size, infile, isb.st_mtime);
1780 goto out;
1781 }
1782
1783 bytes_read = read_retry(STDIN_FILENO, fourbytes, sizeof fourbytes);
1784 if (bytes_read == -1) {
1785 maybe_warn("can't read stdin");
1786 goto out;
1787 } else if (bytes_read != sizeof(fourbytes)) {
1788 maybe_warnx("(stdin): unexpected end of file");
1789 goto out;
1790 }
1791
1792 method = file_gettype(fourbytes);
1793 switch (method) {
1794 default:
1795 if (fflag == 0) {
1796 maybe_warnx("unknown compression format");
1797 goto out;
1798 }
1799 usize = cat_fd(fourbytes, sizeof fourbytes, &gsize, STDIN_FILENO);
1800 break;
1801 case FT_GZIP:
1802 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1803 (char *)fourbytes, sizeof fourbytes, &gsize, "(stdin)");
1804 break;
1805 #ifndef NO_BZIP2_SUPPORT
1806 case FT_BZIP2:
1807 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1808 (char *)fourbytes, sizeof fourbytes, &gsize);
1809 break;
1810 #endif
1811 #ifndef NO_COMPRESS_SUPPORT
1812 case FT_Z:
1813 if ((in = zdopen(STDIN_FILENO)) == NULL) {
1814 maybe_warnx("zopen of stdin");
1815 goto out;
1816 }
1817
1818 usize = zuncompress(in, stdout, (char *)fourbytes,
1819 sizeof fourbytes, &gsize);
1820 fclose(in);
1821 break;
1822 #endif
1823 #ifndef NO_PACK_SUPPORT
1824 case FT_PACK:
1825 usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1826 (char *)fourbytes, sizeof fourbytes, &gsize);
1827 break;
1828 #endif
1829 #ifndef NO_XZ_SUPPORT
1830 case FT_XZ:
1831 usize = unxz(STDIN_FILENO, STDOUT_FILENO,
1832 (char *)fourbytes, sizeof fourbytes, &gsize);
1833 break;
1834 #endif
1835 #ifndef NO_LZ_SUPPORT
1836 case FT_LZ:
1837 usize = unlz(STDIN_FILENO, STDOUT_FILENO,
1838 (char *)fourbytes, sizeof fourbytes, &gsize);
1839 break;
1840 #endif
1841 #ifndef NO_ZSTD_SUPPORT
1842 case FT_ZSTD:
1843 usize = unzstd(STDIN_FILENO, STDOUT_FILENO,
1844 (char *)fourbytes, sizeof fourbytes, &gsize);
1845 break;
1846 #endif
1847 }
1848
1849 if (vflag && !tflag && usize != -1 && gsize != -1)
1850 print_verbage(NULL, NULL, usize, gsize);
1851 if (vflag && tflag)
1852 print_test("(stdin)", usize != -1);
1853
1854 out:
1855 infile_clear();
1856 }
1857
1858 static void
handle_stdout(void)1859 handle_stdout(void)
1860 {
1861 off_t gsize;
1862 off_t usize;
1863 struct stat sb;
1864 time_t systime;
1865 uint32_t mtime;
1866 int ret;
1867
1868 infile_set("(stdout)", 0);
1869
1870 if (fflag == 0 && isatty(STDOUT_FILENO)) {
1871 maybe_warnx("standard output is a terminal -- ignoring");
1872 return;
1873 }
1874
1875 /* If stdin is a file use its mtime, otherwise use current time */
1876 ret = fstat(STDIN_FILENO, &sb);
1877 if (ret < 0) {
1878 maybe_warn("Can't stat stdin");
1879 return;
1880 }
1881
1882 if (S_ISREG(sb.st_mode)) {
1883 infile_set("(stdout)", sb.st_size);
1884 mtime = (uint32_t)sb.st_mtime;
1885 } else {
1886 systime = time(NULL);
1887 if (systime == -1) {
1888 maybe_warn("time");
1889 return;
1890 }
1891 mtime = (uint32_t)systime;
1892 }
1893
1894 usize =
1895 gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1896 if (vflag && !tflag && usize != -1 && gsize != -1)
1897 print_verbage(NULL, NULL, usize, gsize);
1898 }
1899
1900 /* do what is asked for, for the path name */
1901 static void
handle_pathname(char * path)1902 handle_pathname(char *path)
1903 {
1904 char *opath = path, *s = NULL;
1905 ssize_t len;
1906 int slen;
1907 struct stat sb;
1908
1909 /* check for stdout/stdin */
1910 if (path[0] == '-' && path[1] == '\0') {
1911 if (dflag)
1912 handle_stdin();
1913 else
1914 handle_stdout();
1915 return;
1916 }
1917
1918 retry:
1919 if (stat(path, &sb) != 0 || (fflag == 0 && cflag == 0 &&
1920 lstat(path, &sb) != 0)) {
1921 /* lets try <path>.gz if we're decompressing */
1922 if (dflag && s == NULL && errno == ENOENT) {
1923 len = strlen(path);
1924 slen = suffixes[0].ziplen;
1925 s = malloc(len + slen + 1);
1926 if (s == NULL)
1927 maybe_err("malloc");
1928 memcpy(s, path, len);
1929 memcpy(s + len, suffixes[0].zipped, slen + 1);
1930 path = s;
1931 goto retry;
1932 }
1933 maybe_warn("can't stat: %s", opath);
1934 goto out;
1935 }
1936
1937 if (S_ISDIR(sb.st_mode)) {
1938 if (rflag)
1939 handle_dir(path);
1940 else
1941 maybe_warnx("%s is a directory", path);
1942 goto out;
1943 }
1944
1945 if (S_ISREG(sb.st_mode))
1946 handle_file(path, &sb);
1947 else
1948 maybe_warnx("%s is not a regular file", path);
1949
1950 out:
1951 if (s)
1952 free(s);
1953 }
1954
1955 /* compress/decompress a file */
1956 static void
handle_file(char * file,struct stat * sbp)1957 handle_file(char *file, struct stat *sbp)
1958 {
1959 off_t usize, gsize;
1960 char outfile[PATH_MAX];
1961
1962 infile_set(file, sbp->st_size);
1963 if (dflag) {
1964 usize = file_uncompress(file, outfile, sizeof(outfile));
1965 if (vflag && tflag)
1966 print_test(file, usize != -1);
1967 if (usize == -1)
1968 return;
1969 gsize = sbp->st_size;
1970 } else {
1971 gsize = file_compress(file, outfile, sizeof(outfile));
1972 if (gsize == -1)
1973 return;
1974 usize = sbp->st_size;
1975 }
1976 infile_clear();
1977
1978 if (vflag && !tflag)
1979 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
1980 }
1981
1982 /* this is used with -r to recursively descend directories */
1983 static void
handle_dir(char * dir)1984 handle_dir(char *dir)
1985 {
1986 char *path_argv[2];
1987 FTS *fts;
1988 FTSENT *entry;
1989
1990 path_argv[0] = dir;
1991 path_argv[1] = 0;
1992 fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
1993 if (fts == NULL) {
1994 warn("couldn't fts_open %s", dir);
1995 return;
1996 }
1997
1998 while (errno = 0, (entry = fts_read(fts))) {
1999 switch(entry->fts_info) {
2000 case FTS_D:
2001 case FTS_DP:
2002 continue;
2003
2004 case FTS_DNR:
2005 case FTS_ERR:
2006 case FTS_NS:
2007 maybe_warn("%s", entry->fts_path);
2008 continue;
2009 case FTS_F:
2010 handle_file(entry->fts_path, entry->fts_statp);
2011 }
2012 }
2013 if (errno != 0)
2014 warn("error with fts_read %s", dir);
2015 (void)fts_close(fts);
2016 }
2017
2018 /* print a ratio - size reduction as a fraction of uncompressed size */
2019 static void
print_ratio(off_t in,off_t out,FILE * where)2020 print_ratio(off_t in, off_t out, FILE *where)
2021 {
2022 int percent10; /* 10 * percent */
2023 off_t diff;
2024 char buff[8];
2025 int len;
2026
2027 diff = in - out/2;
2028 if (in == 0 && out == 0)
2029 percent10 = 0;
2030 else if (diff < 0)
2031 /*
2032 * Output is more than double size of input! print -99.9%
2033 * Quite possibly we've failed to get the original size.
2034 */
2035 percent10 = -999;
2036 else {
2037 /*
2038 * We only need 12 bits of result from the final division,
2039 * so reduce the values until a 32bit division will suffice.
2040 */
2041 while (in > 0x100000) {
2042 diff >>= 1;
2043 in >>= 1;
2044 }
2045 if (in != 0)
2046 percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
2047 else
2048 percent10 = 0;
2049 }
2050
2051 len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
2052 /* Move the '.' to before the last digit */
2053 buff[len - 1] = buff[len - 2];
2054 buff[len - 2] = '.';
2055 fprintf(where, "%5s%%", buff);
2056 }
2057
2058 /* print compression statistics, and the new name (if there is one!) */
2059 static void
print_verbage(const char * file,const char * nfile,off_t usize,off_t gsize)2060 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
2061 {
2062 if (file)
2063 fprintf(stderr, "%s:%s ", file,
2064 strlen(file) < 7 ? "\t\t" : "\t");
2065 print_ratio(usize, gsize, stderr);
2066 if (nfile)
2067 fprintf(stderr, " -- replaced with %s", nfile);
2068 fprintf(stderr, "\n");
2069 fflush(stderr);
2070 }
2071
2072 /* print test results */
2073 static void
print_test(const char * file,int ok)2074 print_test(const char *file, int ok)
2075 {
2076
2077 if (exit_value == 0 && ok == 0)
2078 exit_value = 1;
2079 fprintf(stderr, "%s:%s %s\n", file,
2080 strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
2081 fflush(stderr);
2082 }
2083
2084 /* print a file's info ala --list */
2085 /* eg:
2086 compressed uncompressed ratio uncompressed_name
2087 354841 1679360 78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
2088 */
2089 static void
print_list(int fd,off_t out,const char * outfile,time_t ts)2090 print_list(int fd, off_t out, const char *outfile, time_t ts)
2091 {
2092 static int first = 1;
2093 static off_t in_tot, out_tot;
2094 uint32_t crc = 0;
2095 off_t in = 0, rv;
2096
2097 if (first) {
2098 if (vflag)
2099 printf("method crc date time ");
2100 if (qflag == 0)
2101 printf(" compressed uncompressed "
2102 "ratio uncompressed_name\n");
2103 }
2104 first = 0;
2105
2106 /* print totals? */
2107 if (fd == -1) {
2108 in = in_tot;
2109 out = out_tot;
2110 } else
2111 {
2112 /* read the last 4 bytes - this is the uncompressed size */
2113 rv = lseek(fd, (off_t)(-8), SEEK_END);
2114 if (rv != -1) {
2115 unsigned char buf[8];
2116 uint32_t usize;
2117
2118 rv = read(fd, (char *)buf, sizeof(buf));
2119 if (rv == -1)
2120 maybe_warn("read of uncompressed size");
2121 else if (rv != sizeof(buf))
2122 maybe_warnx("read of uncompressed size");
2123
2124 else {
2125 usize = le32dec(&buf[4]);
2126 in = (off_t)usize;
2127 crc = le32dec(&buf[0]);
2128 }
2129 }
2130 }
2131
2132 if (vflag && fd == -1)
2133 printf(" ");
2134 else if (vflag) {
2135 char *date = ctime(&ts);
2136
2137 /* skip the day, 1/100th second, and year */
2138 date += 4;
2139 date[12] = 0;
2140 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
2141 }
2142 in_tot += in;
2143 out_tot += out;
2144 print_list_out(out, in, outfile);
2145 }
2146
2147 static void
print_list_out(off_t out,off_t in,const char * outfile)2148 print_list_out(off_t out, off_t in, const char *outfile)
2149 {
2150 printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
2151 print_ratio(in, out, stdout);
2152 printf(" %s\n", outfile);
2153 }
2154
2155 /* display the usage of NetBSD gzip */
2156 static void
usage(void)2157 usage(void)
2158 {
2159
2160 fprintf(stderr, "%s\n", gzip_version);
2161 fprintf(stderr,
2162 "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
2163 " -1 --fast fastest (worst) compression\n"
2164 " -2 .. -8 set compression level\n"
2165 " -9 --best best (slowest) compression\n"
2166 " -c --stdout write to stdout, keep original files\n"
2167 " --to-stdout\n"
2168 " -d --decompress uncompress files\n"
2169 " --uncompress\n"
2170 " -f --force force overwriting & compress links\n"
2171 " -h --help display this help\n"
2172 " -k --keep don't delete input files during operation\n"
2173 " -l --list list compressed file contents\n"
2174 " -N --name save or restore original file name and time stamp\n"
2175 " -n --no-name don't save original file name or time stamp\n"
2176 " -q --quiet output no warnings\n"
2177 " -r --recursive recursively compress files in directories\n"
2178 " -S .suf use suffix .suf instead of .gz\n"
2179 " --suffix .suf\n"
2180 " -t --test test compressed file\n"
2181 " -V --version display program version\n"
2182 " -v --verbose print extra statistics\n",
2183 getprogname());
2184 exit(0);
2185 }
2186
2187 /* display the license information of FreeBSD gzip */
2188 static void
display_license(void)2189 display_license(void)
2190 {
2191
2192 fprintf(stderr, "%s (based on NetBSD gzip 20150113)\n", gzip_version);
2193 fprintf(stderr, "%s\n", gzip_copyright);
2194 exit(0);
2195 }
2196
2197 /* display the version of NetBSD gzip */
2198 static void
display_version(void)2199 display_version(void)
2200 {
2201
2202 fprintf(stderr, "%s\n", gzip_version);
2203 exit(0);
2204 }
2205
2206 #ifndef NO_BZIP2_SUPPORT
2207 #include "unbzip2.c"
2208 #endif
2209 #ifndef NO_COMPRESS_SUPPORT
2210 #include "zuncompress.c"
2211 #endif
2212 #ifndef NO_PACK_SUPPORT
2213 #include "unpack.c"
2214 #endif
2215 #ifndef NO_XZ_SUPPORT
2216 #include "unxz.c"
2217 #endif
2218 #ifndef NO_LZ_SUPPORT
2219 #include "unlz.c"
2220 #endif
2221 #ifndef NO_ZSTD_SUPPORT
2222 #include "unzstd.c"
2223 #endif
2224
2225 static ssize_t
read_retry(int fd,void * buf,size_t sz)2226 read_retry(int fd, void *buf, size_t sz)
2227 {
2228 char *cp = buf;
2229 size_t left = MIN(sz, (size_t) SSIZE_MAX);
2230
2231 while (left > 0) {
2232 ssize_t ret;
2233
2234 ret = read(fd, cp, left);
2235 if (ret == -1) {
2236 return ret;
2237 } else if (ret == 0) {
2238 break; /* EOF */
2239 }
2240 cp += ret;
2241 left -= ret;
2242 }
2243
2244 return sz - left;
2245 }
2246
2247 static ssize_t
write_retry(int fd,const void * buf,size_t sz)2248 write_retry(int fd, const void *buf, size_t sz)
2249 {
2250 const char *cp = buf;
2251 size_t left = MIN(sz, (size_t) SSIZE_MAX);
2252
2253 while (left > 0) {
2254 ssize_t ret;
2255
2256 ret = write(fd, cp, left);
2257 if (ret == -1) {
2258 return ret;
2259 } else if (ret == 0) {
2260 abort(); /* Can't happen */
2261 }
2262 cp += ret;
2263 left -= ret;
2264 }
2265
2266 return sz - left;
2267 }
2268