aboutsummaryrefslogtreecommitdiff
path: root/archival/tar.c
blob: 3227ce5bdb71b50a98323bd2366b67d871c8954c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
/* vi: set sw=4 ts=4: */
/*
 * Mini tar implementation for busybox 
 *
 * Note, that as of BusyBox-0.43, tar has been completely rewritten from the
 * ground up.  It still has remnents of the old code lying about, but it is
 * very different now (i.e. cleaner, less global variables, etc)
 *
 * Copyright (C) 2000 by Lineo, inc.
 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
 *
 * Based in part in the tar implementation in sash
 *  Copyright (c) 1999 by David I. Bell
 *  Permission is granted to use, distribute, or modify this source,
 *  provided that this copyright notice remains intact.
 *  Permission to distribute sash derived code under the GPL has been granted.
 *
 * Based in part on the tar implementation from busybox-0.28
 *  Copyright (C) 1995 Bruce Perens
 *  This is free software under the GNU General Public License.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */


#include "internal.h"
#define BB_DECLARE_EXTERN
#define bb_need_io_error
#include "messages.c"
#include <stdio.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <time.h>
#include <utime.h>
#include <sys/types.h>
#include <sys/sysmacros.h>

/* Tar file constants  */
#ifndef MAJOR
#define MAJOR(dev) (((dev)>>8)&0xff)
#define MINOR(dev) ((dev)&0xff)
#endif


/* POSIX tar Header Block, from POSIX 1003.1-1990  */
struct TarHeader
{
                                /* byte offset */
	char name[100];               /*   0-99 */
	char mode[8];                 /* 100-107 */
	char uid[8];                  /* 108-115 */
	char gid[8];                  /* 116-123 */
	char size[12];                /* 124-135 */
	char mtime[12];               /* 136-147 */
	char chksum[8];               /* 148-155 */
	char typeflag;                /* 156-156 */
	char linkname[100];           /* 157-256 */
	char magic[6];                /* 257-262 */
	char version[2];              /* 263-264 */
	char uname[32];               /* 265-296 */
	char gname[32];               /* 297-328 */
	char devmajor[8];             /* 329-336 */
	char devminor[8];             /* 337-344 */
	char prefix[155];             /* 345-499 */
	char padding[12];             /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
};
typedef struct TarHeader TarHeader;


/* A few useful constants */
#define TAR_MAGIC          "ustar"        /* ustar and a null */
#define TAR_VERSION        "  "           /* Be compatable with GNU tar format */
#define TAR_MAGIC_LEN       6
#define TAR_VERSION_LEN     2
#define TAR_BLOCK_SIZE      512

/* A nice enum with all the possible tar file content types */
enum TarFileType 
{
	REGTYPE  = '0',            /* regular file */
	REGTYPE0 = '\0',           /* regular file (ancient bug compat)*/
	LNKTYPE  = '1',            /* hard link */
	SYMTYPE  = '2',            /* symbolic link */
	CHRTYPE  = '3',            /* character special */
	BLKTYPE  = '4',            /* block special */
	DIRTYPE  = '5',            /* directory */
	FIFOTYPE = '6',            /* FIFO special */
	CONTTYPE = '7',            /* reserved */
};
typedef enum TarFileType TarFileType;

/* This struct ignores magic, non-numeric user name, 
 * non-numeric group name, and the checksum, since
 * these are all ignored by BusyBox tar. */ 
struct TarInfo
{
	int              tarFd;          /* An open file descriptor for reading from the tarball */
	char *           name;           /* File name */
	mode_t           mode;           /* Unix mode, including device bits. */
	uid_t            uid;            /* Numeric UID */
	gid_t            gid;            /* Numeric GID */
	size_t           size;           /* Size of file */
	time_t           mtime;          /* Last-modified time */
	enum TarFileType type;           /* Regular, directory, link, etc */
	char *           linkname;       /* Name for symbolic and hard links */
	long             devmajor;       /* Major number for special device */
	long             devminor;       /* Minor number for special device */
};
typedef struct TarInfo TarInfo;

/* Local procedures to restore files from a tar file.  */
static int readTarFile(const char* tarName, int extractFlag, int listFlag, 
		int tostdoutFlag, int verboseFlag, char** excludeList);



#ifdef BB_FEATURE_TAR_CREATE
/* Local procedures to save files into a tar file.  */
static int writeTarFile(const char* tarName, int tostdoutFlag, 
		int verboseFlag, int argc, char **argv, char** excludeList);
#endif


extern int tar_main(int argc, char **argv)
{
	char** excludeList=NULL;
#if defined BB_FEATURE_TAR_EXCLUDE
	int excludeListSize=0;
#endif
	const char *tarName="-";
	int listFlag     = FALSE;
	int extractFlag  = FALSE;
	int createFlag   = FALSE;
	int verboseFlag  = FALSE;
	int tostdoutFlag = FALSE;
	int stopIt;

	if (argc <= 1)
		usage(tar_usage);

	/* Parse any options */
	while (--argc > 0 && strspn(*(++argv), "-cxt") >0 ) {
		stopIt=FALSE;
		while (stopIt==FALSE && *argv && **argv) {
			switch (**argv) {
				case 'f':
					if (--argc == 0) {
						fatalError( "Option requires an argument: No file specified\n");
					}
					if (*tarName != '-')
						fatalError( "Only one 'f' option allowed\n");
					tarName = *(++argv);
					if (tarName == NULL)
						fatalError( "Option requires an argument: No file specified\n");
					if (!strcmp(tarName, "-") && createFlag == TRUE)
						tostdoutFlag = TRUE;
					stopIt=TRUE;
					break;

				case 't':
					if (extractFlag == TRUE || createFlag == TRUE)
						goto flagError;
					listFlag = TRUE;
					break;

				case 'x':
					if (listFlag == TRUE || createFlag == TRUE)
						goto flagError;
					extractFlag = TRUE;
					break;
				case 'c':
					if (extractFlag == TRUE || listFlag == TRUE)
						goto flagError;
					createFlag = TRUE;
					break;

				case 'v':
					verboseFlag = TRUE;
					break;

				case 'O':
					tostdoutFlag = TRUE;
					tarName = "-";
					break;
				case '-':
#if defined BB_FEATURE_TAR_EXCLUDE
					if (strcmp(*argv, "-exclude")==0) {
						if (--argc == 0) {
							fatalError( "Option requires an argument: No file specified\n");
						}
						excludeList=realloc( excludeList, sizeof(char**) * (excludeListSize+2));
						excludeList[excludeListSize] = *(++argv);
						/* Remove leading "/"s */
						if (*excludeList[excludeListSize] =='/') {
							excludeList[excludeListSize] = (excludeList[excludeListSize])+1;
						}
						if (excludeList[excludeListSize++] == NULL)
							fatalError( "Option requires an argument: No file specified\n");
						/* Tack a NULL onto the end of the list */
						excludeList[excludeListSize] = NULL;
						stopIt=TRUE;
						break;
					}
#endif
					if (strcmp(*argv, "-help")==0) {
						usage(tar_usage);
					}
					break;

				default:
					fatalError( "Unknown tar flag '%c'\n" 
							"Try `tar --help' for more information\n", **argv);
			}
			++(*argv);
		}
	}

	/* 
	 * Do the correct type of action supplying the rest of the
	 * command line arguments as the list of files to process.
	 */
	if (createFlag == TRUE) {
#ifndef BB_FEATURE_TAR_CREATE
		fatalError( "This version of tar was not compiled with tar creation support.\n");
#else
		exit(writeTarFile(tarName, tostdoutFlag, verboseFlag, argc, argv, excludeList));
#endif
	}
	if (listFlag == TRUE || extractFlag == TRUE) {
		exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, excludeList));
	}

  flagError:
	fatalError( "Exactly one of 'c', 'x' or 't' must be specified\n");
}
					
static void
fixUpPermissions(TarInfo *header)
{
	struct utimbuf t;
	/* Now set permissions etc for the new file */
	chown(header->name, header->uid, header->gid);
	chmod(header->name, header->mode);
	/* Reset the time */
	t.actime = time(0);
	t.modtime = header->mtime;
	utime(header->name, &t);
}
				
static int
tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
{
	size_t  writeSize;
	size_t  readSize;
	size_t  actualWriteSz;
	char    buffer[BUFSIZ];
	size_t  size = header->size;
	int outFd=fileno(stdout);

	/* Open the file to be written, if a file is supposed to be written */
	if (extractFlag==TRUE && tostdoutFlag==FALSE) {
		/* Create the path to the file, just in case it isn't there...
		 * This should not screw up path permissions or anything. */
		createPath(header->name, 0777);
		if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY, 
						header->mode & ~S_IFMT)) < 0) {
			errorMsg(io_error, header->name, strerror(errno)); 
			return( FALSE);
		}
	}

	/* Write out the file, if we are supposed to be doing that */
	while ( size > 0 ) {
		actualWriteSz=0;
		if ( size > sizeof(buffer) )
			writeSize = readSize = sizeof(buffer);
		else {
			int mod = size % 512;
			if ( mod != 0 )
				readSize = size + (512 - mod);
			else
				readSize = size;
			writeSize = size;
		}
		if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) {
			/* Tarball seems to have a problem */
			errorMsg("Unexpected EOF in archive\n"); 
			return( FALSE);
		}
		if ( readSize < writeSize )
			writeSize = readSize;

		/* Write out the file, if we are supposed to be doing that */
		if (extractFlag==TRUE) {

			if ((actualWriteSz=fullWrite(outFd, buffer, writeSize)) != writeSize ) {
				/* Output file seems to have a problem */
				errorMsg(io_error, header->name, strerror(errno)); 
				return( FALSE);
			}
		} else {
			actualWriteSz=writeSize;
		}

		size -= actualWriteSz;
	}

	/* Now we are done writing the file out, so try 
	 * and fix up the permissions and whatnot */
	if (extractFlag==TRUE && tostdoutFlag==FALSE) {
		close(outFd);
		fixUpPermissions(header);
	}
	return( TRUE);
}

static int
tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
{

	if (extractFlag==FALSE || tostdoutFlag==TRUE)
		return( TRUE);

	if (createPath(header->name, header->mode) != TRUE) {
		errorMsg("%s: Cannot mkdir: %s\n", 
				header->name, strerror(errno)); 
		return( FALSE);
	}
	/* make the final component, just in case it was
	 * omitted by createPath() (which will skip the
	 * directory if it doesn't have a terminating '/') */
	if (mkdir(header->name, header->mode) == 0) {
		fixUpPermissions(header);
	}
	return( TRUE);
}

static int
tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
{
	if (extractFlag==FALSE || tostdoutFlag==TRUE)
		return( TRUE);

	if (link(header->linkname, header->name) < 0) {
		errorMsg("%s: Cannot create hard link to '%s': %s\n", 
				header->name, header->linkname, strerror(errno)); 
		return( FALSE);
	}

	/* Now set permissions etc for the new directory */
	fixUpPermissions(header);
	return( TRUE);
}

static int
tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
{
	if (extractFlag==FALSE || tostdoutFlag==TRUE)
		return( TRUE);

#ifdef	S_ISLNK
	if (symlink(header->linkname, header->name) < 0) {
		errorMsg("%s: Cannot create symlink to '%s': %s\n", 
				header->name, header->linkname, strerror(errno)); 
		return( FALSE);
	}
	/* Try to change ownership of the symlink.
	 * If libs doesn't support that, don't bother.
	 * Changing the pointed-to-file is the Wrong Thing(tm).
	 */
#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
	lchown(header->name, header->uid, header->gid);
#endif

	/* Do not change permissions or date on symlink,
	 * since it changes the pointed to file instead.  duh. */
#else
	errorMsg("%s: Cannot create symlink to '%s': %s\n", 
			header->name, header->linkname, 
			"symlinks not supported"); 
#endif
	return( TRUE);
}

static int
tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
{
	if (extractFlag==FALSE || tostdoutFlag==TRUE)
		return( TRUE);

	if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
		if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
			errorMsg("%s: Cannot mknod: %s\n",
				header->name, strerror(errno)); 
			return( FALSE);
		}
	} else if (S_ISFIFO(header->mode)) {
		if (mkfifo(header->name, header->mode) < 0) {
			errorMsg("%s: Cannot mkfifo: %s\n",
				header->name, strerror(errno)); 
			return( FALSE);
		}
	}

	/* Now set permissions etc for the new directory */
	fixUpPermissions(header);
	return( TRUE);
}

/* Read an octal value in a field of the specified width, with optional
 * spaces on both sides of the number and with an optional null character
 * at the end.  Returns -1 on an illegal format.  */
static long getOctal(const char *cp, int size)
{
	long val = 0;

	for(;(size > 0) && (*cp == ' '); cp++, size--);
	if ((size == 0) || !isOctal(*cp))
		return -1;
	for(; (size > 0) && isOctal(*cp); size--) {
		val = val * 8 + *cp++ - '0';
	}
	for (;(size > 0) && (*cp == ' '); cp++, size--);
	if ((size > 0) && *cp)
		return -1;
	return val;
}


/* Parse the tar header and fill in the nice struct with the details */
static int
readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
{
	int i;
	long chksum, sum=0;
	unsigned char *s = (unsigned char *)rawHeader;

	header->name  = rawHeader->name;
	/* Check for and relativify any absolute paths */
	if ( *(header->name) == '/' ) {
		static int alreadyWarned=FALSE;

		while (*(header->name) == '/')
			++*(header->name);

		if (alreadyWarned == FALSE) {
			errorMsg("Removing leading '/' from member names\n");
			alreadyWarned = TRUE;
		}
	}

	header->mode  = getOctal(rawHeader->mode, sizeof(rawHeader->mode));
	header->uid   =  getOctal(rawHeader->uid, sizeof(rawHeader->uid));
	header->gid   =  getOctal(rawHeader->gid, sizeof(rawHeader->gid));
	header->size  = getOctal(rawHeader->size, sizeof(rawHeader->size));
	header->mtime = getOctal(rawHeader->mtime, sizeof(rawHeader->mtime));
	chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
	header->type  = rawHeader->typeflag;
	header->linkname  = rawHeader->linkname;
	header->devmajor  = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
	header->devminor  = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));

	/* Check the checksum */
	for (i = sizeof(*rawHeader); i-- != 0;) {
		sum += *s++;
	}
	/* Remove the effects of the checksum field (replace 
	 * with blanks for the purposes of the checksum) */
	s = rawHeader->chksum;
	for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
		sum -= *s++;
	}
	sum += ' ' * sizeof(rawHeader->chksum);
	if (sum == chksum )
		return ( TRUE);
	return( FALSE);
}


/*
 * Read a tar file and extract or list the specified files within it.
 * If the list is empty than all files are extracted or listed.
 */
static int readTarFile(const char* tarName, int extractFlag, int listFlag, 
		int tostdoutFlag, int verboseFlag, char** excludeList)
{
	int status, tarFd=-1;
	int errorFlag=FALSE;
	TarHeader rawHeader;
	TarInfo header;
#if defined BB_FEATURE_TAR_EXCLUDE
	char** tmpList;
#endif

	/* Open the tar file for reading.  */
	if (!strcmp(tarName, "-"))
		tarFd = fileno(stdin);
	else
		tarFd = open(tarName, O_RDONLY);
	if (tarFd < 0) {
		errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
		return ( FALSE);
	}

	/* Set the umask for this process so it doesn't 
	 * screw up permission setting for us later. */
	umask(0);

	/* Read the tar file, and iterate over it one file at a time */
	while ( (status = fullRead(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {

		/* First, try to read the header */
		if ( readTarHeader(&rawHeader, &header) == FALSE ) {
			if ( *(header.name) == '\0' ) {
				goto endgame;
			} else {
				errorFlag=TRUE;
				errorMsg("Bad tar header, skipping\n");
				continue;
			}
		}
		if ( *(header.name) == '\0' )
				goto endgame;
		header.tarFd = tarFd;

#if defined BB_FEATURE_TAR_EXCLUDE
		{
			int skipFlag=FALSE;
			/* Check for excluded files....  */
			for (tmpList=excludeList; tmpList && *tmpList; tmpList++) {
				/* Do some extra hoop jumping for when directory names
				 * end in '/' but the entry in tmpList doesn't */
				if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
							header.name[strlen(header.name)-1]=='/'
							&& strncmp( *tmpList, header.name, 
								MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
					/* If it is a regular file, pretend to extract it with
					 * the extractFlag set to FALSE, so the junk in the tarball
					 * is properly skipped over */
					if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
							tarExtractRegularFile(&header, FALSE, FALSE);
					}
					skipFlag=TRUE;
					break;
				}
			}
			/* There are not the droids you're looking for, move along */
			if (skipFlag==TRUE)
				continue;
		}
#endif
		/* Special treatment if the list (-t) flag is on */
		if (verboseFlag == TRUE && extractFlag == FALSE) {
			int len, len1;
			char buf[35];
			struct tm *tm = localtime (&(header.mtime));

			len=printf("%s ", modeString(header.mode));
			memset(buf, 0, 8*sizeof(char));
			my_getpwuid(buf, header.uid);
			if (! *buf)
				len+=printf("%d", header.uid);
			else
				len+=printf("%s", buf);
			memset(buf, 0, 8*sizeof(char));
			my_getgrgid(buf, header.gid);
			if (! *buf)
				len+=printf("/%-d ", header.gid);
			else
				len+=printf("/%-s ", buf);

			if (header.type==CHRTYPE || header.type==BLKTYPE) {
				len1=snprintf(buf, sizeof(buf), "%ld,%-ld ", 
						header.devmajor, header.devminor);
			} else {
				len1=snprintf(buf, sizeof(buf), "%lu ", (long)header.size);
			}
			/* Jump through some hoops to make the columns match up */
			for(;(len+len1)<31;len++)
				printf(" ");
			printf(buf);

			/* Use ISO 8610 time format */
			if (tm) { 
				printf ("%04d-%02d-%02d %02d:%02d:%02d ", 
						tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, 
						tm->tm_hour, tm->tm_min, tm->tm_sec);
			}
		}
		/* List contents if we are supposed to do that */
		if (verboseFlag == TRUE || listFlag == TRUE) {
			/* Now the normal listing */
			printf("%s", header.name);
		}
		if (verboseFlag == TRUE && listFlag == TRUE) {
			/* If this is a link, say so */
			if (header.type==LNKTYPE)
				printf(" link to %s", header.linkname);
			else if (header.type==SYMTYPE)
				printf(" -> %s", header.linkname);
		}
		if (verboseFlag == TRUE || listFlag == TRUE) {
			printf("\n");
		}

		/* Remove any clutter lying in our way */
		if (extractFlag == TRUE)	/* .. but only if we are extracting (as */
			unlink( header.name);	/* opposed to listing) (rob@sysgo.de)   */

		/* If we got here, we can be certain we have a legitimate 
		 * header to work with.  So work with it.  */
		switch ( header.type ) {
			case REGTYPE:
			case REGTYPE0:
				/* If the name ends in a '/' then assume it is
				 * supposed to be a directory, and fall through */
				if (header.name[strlen(header.name)-1] != '/') {
					if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
						errorFlag=TRUE;
					break;
				}
			case DIRTYPE:
				if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
					errorFlag=TRUE;
				break;
			case LNKTYPE:
				if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
					errorFlag=TRUE;
				break;
			case SYMTYPE:
				if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
					errorFlag=TRUE;
				break;
			case CHRTYPE:
			case BLKTYPE:
			case FIFOTYPE:
				if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
					errorFlag=TRUE;
				break;
			default:
				close( tarFd);
				return( FALSE);
		}
	}
	close(tarFd);
	if (status > 0) {
		/* Bummer - we read a partial header */
		errorMsg( "Error reading '%s': %s\n", tarName, strerror(errno));
		return ( FALSE);
	}
	else if (errorFlag==TRUE) {
		errorMsg( "Error exit delayed from previous errors\n");
		return( FALSE);
	} else 
		return( status);

	/* Stuff to do when we are done */
endgame:
	close( tarFd);
	if ( *(header.name) == '\0' ) {
		if (errorFlag==TRUE)
			errorMsg( "Error exit delayed from previous errors\n");
		else
			return( TRUE);
	} 
	return( FALSE);
}


#ifdef BB_FEATURE_TAR_CREATE

/* Some info to be carried along when creating a new tarball */
struct TarBallInfo
{
	char* fileName;               /* File name of the tarball */
	int tarFd;                    /* Open-for-write file descriptor
									 for the tarball */
	struct stat statBuf;          /* Stat info for the tarball, letting
									 us know the inode and device that the
									 tarball lives, so we can avoid trying 
									 to include the tarball into itself */
	int verboseFlag;              /* Whether to print extra stuff or not */
	char** excludeList;           /* List of files to not include */
};
typedef struct TarBallInfo TarBallInfo;


/* Put an octal string into the specified buffer.
 * The number is zero and space padded and possibly null padded.
 * Returns TRUE if successful.  */ 
static int putOctal (char *cp, int len, long value)
{
	int tempLength;
	char tempBuffer[32];
	char *tempString = tempBuffer;

	/* Create a string of the specified length with an initial space,
	 * leading zeroes and the octal number, and a trailing null.  */
	sprintf (tempString, "%0*lo", len - 1, value);

	/* If the string is too large, suppress the leading space.  */
	tempLength = strlen (tempString) + 1;
	if (tempLength > len) {
		tempLength--;
		tempString++;
	}

	/* If the string is still too large, suppress the trailing null.  */
	if (tempLength > len)
		tempLength--;

	/* If the string is still too large, fail.  */
	if (tempLength > len)
		return FALSE;

	/* Copy the string to the field.  */
	memcpy (cp, tempString, len);

	return TRUE;
}

/* Write out a tar header for the specified file/directory/whatever */
static int
writeTarHeader(struct TarBallInfo *tbInfo, const char *fileName, struct stat *statbuf)
{
	long chksum=0;
	struct TarHeader header;
#if defined BB_FEATURE_TAR_EXCLUDE
	char** tmpList;
#endif
	const unsigned char *cp = (const unsigned char *) &header;
	ssize_t size = sizeof(struct TarHeader);

	memset( &header, 0, size);

	if (*fileName=='/') {
		static int alreadyWarned=FALSE;
		if (alreadyWarned==FALSE) {
			errorMsg("Removing leading '/' from member names\n");
			alreadyWarned=TRUE;
		}
		strncpy(header.name, fileName+1, sizeof(header.name)); 
	}
	else {
		strncpy(header.name, fileName, sizeof(header.name)); 
	}

#if defined BB_FEATURE_TAR_EXCLUDE
	/* Check for excluded files....  */
	for (tmpList=tbInfo->excludeList; tmpList && *tmpList; tmpList++) {
		/* Do some extra hoop jumping for when directory names
		 * end in '/' but the entry in tmpList doesn't */
		if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
					header.name[strlen(header.name)-1]=='/'
					&& strncmp( *tmpList, header.name, 
						MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
			/* Set the mode to something that is not a regular file, thereby
			 * faking out writeTarFile into thinking that nothing further need
			 * be done for this file.  Yes, I know this is ugly, but it works. */
			statbuf->st_mode = 0;
			return( TRUE);
		}
	}
#endif

	putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
	putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
	putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
	putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
	putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
	strncpy(header.magic, TAR_MAGIC TAR_VERSION, 
			TAR_MAGIC_LEN + TAR_VERSION_LEN );

	/* Enter the user and group names (default to root if it fails) */
	my_getpwuid(header.uname, statbuf->st_uid);
	if (! *header.uname)
		strcpy(header.uname, "root");
	my_getgrgid(header.gname, statbuf->st_gid);
	if (! *header.uname)
		strcpy(header.uname, "root");

	/* WARNING/NOTICE: I break Hard Links */
	if (S_ISLNK(statbuf->st_mode)) {
		int link_size=0;
		char buffer[BUFSIZ];
		header.typeflag  = SYMTYPE;
		link_size = readlink(fileName, buffer, sizeof(buffer) - 1);
		if ( link_size < 0) {
			errorMsg("Error reading symlink '%s': %s\n", header.name, strerror(errno));
			return ( FALSE);
		}
		buffer[link_size] = '\0';
		strncpy(header.linkname, buffer, sizeof(header.linkname)); 
	} else if (S_ISDIR(statbuf->st_mode)) {
		header.typeflag  = DIRTYPE;
		strncat(header.name, "/", sizeof(header.name)); 
	} else if (S_ISCHR(statbuf->st_mode)) {
		header.typeflag  = CHRTYPE;
		putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
		putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
	} else if (S_ISBLK(statbuf->st_mode)) {
		header.typeflag  = BLKTYPE;
		putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
		putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
	} else if (S_ISFIFO(statbuf->st_mode)) {
		header.typeflag  = FIFOTYPE;
	} else if (S_ISREG(statbuf->st_mode)) {
		header.typeflag  = REGTYPE;
		putOctal(header.size, sizeof(header.size), statbuf->st_size);
	} else {
		errorMsg("%s: Unknown file type\n", fileName);
		return ( FALSE);
	}

	/* Calculate and store the checksum (i.e. the sum of all of the bytes of
	 * the header).  The checksum field must be filled with blanks for the
	 * calculation.  The checksum field is formatted differently from the
	 * other fields: it has [6] digits, a null, then a space -- rather than
	 * digits, followed by a null like the other fields... */
	memset(header.chksum, ' ', sizeof(header.chksum));
	cp = (const unsigned char *) &header;
	while (size-- > 0)
		chksum += *cp++;
	putOctal(header.chksum, 7, chksum);
	
	/* Now write the header out to disk */
	if ((size=fullWrite(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
		errorMsg(io_error, fileName, strerror(errno)); 
		return ( FALSE);
	}
	/* Pad the header up to the tar block size */
	for (; size<TAR_BLOCK_SIZE; size++) {
		write(tbInfo->tarFd, "\0", 1);
	}
	/* Now do the verbose thing (or not) */
	if (tbInfo->verboseFlag==TRUE)
		fprintf(stdout, "%s\n", header.name);

	return ( TRUE);
}


static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
{
	struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;

	/* It is against the rules to archive a socket */
	if (S_ISSOCK(statbuf->st_mode)) {
		errorMsg("%s: socket ignored\n", fileName);
		return( TRUE);
	}

	/* It is a bad idea to store the archive we are in the process of creating,
	 * so check the device and inode to be sure that this particular file isn't
	 * the new tarball */
	if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
			tbInfo->statBuf.st_ino == statbuf->st_ino) {
		errorMsg("%s: file is the archive; skipping\n", fileName);
		return( TRUE);
	}

	if (writeTarHeader(tbInfo, fileName, statbuf)==FALSE) {
		return( FALSE);
	} 

	/* Now, if the file is a regular file, copy it out to the tarball */
	if (S_ISREG(statbuf->st_mode)) {
		int  inputFileFd;
		char buffer[BUFSIZ];
		ssize_t size=0, readSize=0;

		/* open the file we want to archive, and make sure all is well */
		if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
			errorMsg("%s: Cannot open: %s\n", fileName, strerror(errno));
			return( FALSE);
		}
		
		/* write the file to the archive */
		while ( (size = fullRead(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
			if (fullWrite(tbInfo->tarFd, buffer, size) != size ) {
				/* Output file seems to have a problem */
				errorMsg(io_error, fileName, strerror(errno)); 
				return( FALSE);
			}
			readSize+=size;
		}
		if (size == -1) {
			errorMsg(io_error, fileName, strerror(errno)); 
			return( FALSE);
		}
		/* Pad the file up to the tar block size */
		for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) {
			write(tbInfo->tarFd, "\0", 1);
		}
		close( inputFileFd);
	}

	return( TRUE);
}

static int writeTarFile(const char* tarName, int tostdoutFlag, 
		int verboseFlag, int argc, char **argv, char** excludeList)
{
	int tarFd=-1;
	int errorFlag=FALSE;
	ssize_t size;
	struct TarBallInfo tbInfo;
	tbInfo.verboseFlag = verboseFlag;

	/* Make sure there is at least one file to tar up.  */
	if (argc <= 0)
		fatalError("Cowardly refusing to create an empty archive\n");

	/* Open the tar file for writing.  */
	if (tostdoutFlag == TRUE)
		tbInfo.tarFd = fileno(stdout);
	else
		tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
	if (tbInfo.tarFd < 0) {
		errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
		return ( FALSE);
	}
	tbInfo.excludeList=excludeList;
	/* Store the stat info for the tarball's file, so
	 * can avoid including the tarball into itself....  */
	if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
		fatalError(io_error, tarName, strerror(errno)); 

	/* Set the umask for this process so it doesn't 
	 * screw up permission setting for us later. */
	umask(0);

	/* Read the directory/files and iterate over them one at a time */
	while (argc-- > 0) {
		if (recursiveAction(*argv++, TRUE, FALSE, FALSE,
					writeFileToTarball, writeFileToTarball, 
					(void*) &tbInfo) == FALSE) {
			errorFlag = TRUE;
		}
	}
	/* Write two empty blocks to the end of the archive */
	for (size=0; size<(2*TAR_BLOCK_SIZE); size++) {
		write(tbInfo.tarFd, "\0", 1);
	}

	/* To be pedantically correct, we would check if the tarball
	 * is smaller then 20 tar blocks, and pad it if it was smaller,
	 * but that isn't necessary for GNU tar interoperability, and
	 * so is considered a waste of space */

	/* Hang up the tools, close up shop, head home */
	close(tarFd);
	if (errorFlag == TRUE) {
		errorMsg("Error exit delayed from previous errors\n");
		return(FALSE);
	}
	return( TRUE);
}


#endif