summaryrefslogtreecommitdiffstats
path: root/bin/pax/pat_rep.c
blob: 83e07dd31fa68eb0f49527b2ad66375e8519318a (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
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
/*-
 * Copyright (c) 1992 Keith Muller.
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Keith Muller of the University of California, San Diego.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)pat_rep.c	8.2 (Berkeley) 4/18/94";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#ifdef NET2_REGEX
#include <regexp.h>
#else
#include <regex.h>
#endif
#include "pax.h"
#include "pat_rep.h"
#include "extern.h"

/*
 * routines to handle pattern matching, name modification (regular expression
 * substitution and interactive renames), and destination name modification for
 * copy (-rw). Both file name and link names are adjusted as required in these
 * routines.
 */

#define MAXSUBEXP	10		/* max subexpressions, DO NOT CHANGE */
static PATTERN *pathead = NULL;		/* file pattern match list head */
static PATTERN *pattail = NULL;		/* file pattern match list tail */
static REPLACE *rephead = NULL;		/* replacement string list head */
static REPLACE *reptail = NULL;		/* replacement string list tail */

static int rep_name(char *, int *, int);
static int tty_rename(ARCHD *);
static int fix_path(char *, int *, char *, int);
static int fn_match(char *, char *, char **);
static char * range_match(char *, int);
#ifdef NET2_REGEX
static int resub(regexp *, char *, char *, char *);
#else
static int resub(regex_t *, regmatch_t *, char *, char *, char *);
#endif

/*
 * rep_add()
 *	parses the -s replacement string; compiles the regular expression
 *	and stores the compiled value and it's replacement string together in
 *	replacement string list. Input to this function is of the form:
 *		/old/new/pg
 *	The first char in the string specifies the delimiter used by this
 *	replacement string. "Old" is a regular expression in "ed" format which
 *	is compiled by regcomp() and is applied to filenames. "new" is the
 *	substitution string; p and g are options flags for printing and global
 *	replacement (over the single filename)
 * Return:
 *	0 if a proper replacement string and regular expression was added to
 *	the list of replacement patterns; -1 otherwise.
 */

int
rep_add(char *str)
{
	char *pt1;
	char *pt2;
	REPLACE *rep;
#	ifndef NET2_REGEX
	int res;
	char rebuf[BUFSIZ];
#	endif

	/*
	 * throw out the bad parameters
	 */
	if ((str == NULL) || (*str == '\0')) {
		paxwarn(1, "Empty replacement string");
		return(-1);
	}

	/*
	 * first character in the string specifies what the delimiter is for
	 * this expression
	 */
	if ((pt1 = strchr(str+1, *str)) == NULL) {
		paxwarn(1, "Invalid replacement string %s", str);
		return(-1);
	}

	/*
	 * allocate space for the node that handles this replacement pattern
	 * and split out the regular expression and try to compile it
	 */
	if ((rep = (REPLACE *)malloc(sizeof(REPLACE))) == NULL) {
		paxwarn(1, "Unable to allocate memory for replacement string");
		return(-1);
	}

	*pt1 = '\0';
#	ifdef NET2_REGEX
	if ((rep->rcmp = regcomp(str+1)) == NULL) {
#	else
	if ((res = regcomp(&(rep->rcmp), str+1, 0)) != 0) {
		regerror(res, &(rep->rcmp), rebuf, sizeof(rebuf));
		paxwarn(1, "%s while compiling regular expression %s", rebuf, str);
#	endif
		free(rep);
		return(-1);
	}

	/*
	 * put the delimiter back in case we need an error message and
	 * locate the delimiter at the end of the replacement string
	 * we then point the node at the new substitution string
	 */
	*pt1++ = *str;
	if ((pt2 = strchr(pt1, *str)) == NULL) {
#		ifdef NET2_REGEX
		free(rep->rcmp);
#		else
		regfree(&rep->rcmp);
#		endif
		free(rep);
		paxwarn(1, "Invalid replacement string %s", str);
		return(-1);
	}

	*pt2 = '\0';
	rep->nstr = pt1;
	pt1 = pt2++;
	rep->flgs = 0;

	/*
	 * set the options if any
	 */
	while (*pt2 != '\0') {
		switch(*pt2) {
		case 'g':
		case 'G':
			rep->flgs  |= GLOB;
			break;
		case 'p':
		case 'P':
			rep->flgs  |= PRNT;
			break;
		default:
#			ifdef NET2_REGEX
			free(rep->rcmp);
#			else
			regfree(&rep->rcmp);
#			endif
			free(rep);
			*pt1 = *str;
			paxwarn(1, "Invalid replacement string option %s", str);
			return(-1);
		}
		++pt2;
	}

	/*
	 * all done, link it in at the end
	 */
	rep->fow = NULL;
	if (rephead == NULL) {
		reptail = rephead = rep;
		return(0);
	}
	reptail->fow = rep;
	reptail = rep;
	return(0);
}

/*
 * pat_add()
 *	add a pattern match to the pattern match list. Pattern matches are used
 *	to select which archive members are extracted. (They appear as
 *	arguments to pax in the list and read modes). If no patterns are
 *	supplied to pax, all members in the archive will be selected (and the
 *	pattern match list is empty).
 * Return:
 *	0 if the pattern was added to the list, -1 otherwise
 */

int
pat_add(char *str, char *chdnam)
{
	PATTERN *pt;

	/*
	 * throw out the junk
	 */
	if ((str == NULL) || (*str == '\0')) {
		paxwarn(1, "Empty pattern string");
		return(-1);
	}

	/*
	 * allocate space for the pattern and store the pattern. the pattern is
	 * part of argv so do not bother to copy it, just point at it. Add the
	 * node to the end of the pattern list
	 */
	if ((pt = (PATTERN *)malloc(sizeof(PATTERN))) == NULL) {
		paxwarn(1, "Unable to allocate memory for pattern string");
		return(-1);
	}

	pt->pstr = str;
	pt->pend = NULL;
	pt->plen = strlen(str);
	pt->fow = NULL;
	pt->flgs = 0;
	pt->chdname = chdnam;

	if (pathead == NULL) {
		pattail = pathead = pt;
		return(0);
	}
	pattail->fow = pt;
	pattail = pt;
	return(0);
}

/*
 * pat_chk()
 *	complain if any the user supplied pattern did not result in a match to
 *	a selected archive member.
 */

void
pat_chk(void)
{
	PATTERN *pt;
	int wban = 0;

	/*
	 * walk down the list checking the flags to make sure MTCH was set,
	 * if not complain
	 */
	for (pt = pathead; pt != NULL; pt = pt->fow) {
		if (pt->flgs & MTCH)
			continue;
		if (!wban) {
			paxwarn(1, "WARNING! These patterns were not matched:");
			++wban;
		}
		(void)fprintf(stderr, "%s\n", pt->pstr);
	}
}

/*
 * pat_sel()
 *	the archive member which matches a pattern was selected. Mark the
 *	pattern as having selected an archive member. arcn->pat points at the
 *	pattern that was matched. arcn->pat is set in pat_match()
 *
 *	NOTE: When the -c option is used, we are called when there was no match
 *	by pat_match() (that means we did match before the inverted sense of
 *	the logic). Now this seems really strange at first, but with -c  we
 *	need to keep track of those patterns that cause an archive member to NOT
 *	be selected (it found an archive member with a specified pattern)
 * Return:
 *	0 if the pattern pointed at by arcn->pat was tagged as creating a
 *	match, -1 otherwise.
 */

int
pat_sel(ARCHD *arcn)
{
	PATTERN *pt;
	PATTERN **ppt;
	int len;

	/*
	 * if no patterns just return
	 */
	if ((pathead == NULL) || ((pt = arcn->pat) == NULL))
		return(0);

	/*
	 * when we are NOT limited to a single match per pattern mark the
	 * pattern and return
	 */
	if (!nflag) {
		pt->flgs |= MTCH;
		return(0);
	}

	/*
	 * we reach this point only when we allow a single selected match per
	 * pattern, if the pattern matches a directory and we do not have -d
	 * (dflag) we are done with this pattern. We may also be handed a file
	 * in the subtree of a directory. in that case when we are operating
	 * with -d, this pattern was already selected and we are done
	 */
	if (pt->flgs & DIR_MTCH)
		return(0);

	if (!dflag && ((pt->pend != NULL) || (arcn->type == PAX_DIR))) {
		/*
		 * ok we matched a directory and we are allowing
		 * subtree matches but because of the -n only its children will
		 * match. This is tagged as a DIR_MTCH type.
		 * WATCH IT, the code assumes that pt->pend points
		 * into arcn->name and arcn->name has not been modified.
		 * If not we will have a big mess. Yup this is another kludge
		 */

		/*
		 * if this was a prefix match, remove trailing part of path
		 * so we can copy it. Future matches will be exact prefix match
		 */
		if (pt->pend != NULL)
			*pt->pend = '\0';

		if ((pt->pstr = strdup(arcn->name)) == NULL) {
			paxwarn(1, "Pattern select out of memory");
			if (pt->pend != NULL)
				*pt->pend = '/';
			pt->pend = NULL;
			return(-1);
		}

		/*
		 * put the trailing / back in the source string
		 */
		if (pt->pend != NULL) {
			*pt->pend = '/';
			pt->pend = NULL;
		}
		pt->plen = strlen(pt->pstr);

		/*
		 * strip off any trailing /, this should really never happen
		 */
		len = pt->plen - 1;
		if (*(pt->pstr + len) == '/') {
			*(pt->pstr + len) = '\0';
			pt->plen = len;
		}
		pt->flgs = DIR_MTCH | MTCH;
		arcn->pat = pt;
		return(0);
	}

	/*
	 * we are then done with this pattern, so we delete it from the list
	 * because it can never be used for another match.
	 * Seems kind of strange to do for a -c, but the pax spec is really
	 * vague on the interaction of -c -n and -d. We assume that when -c
	 * and the pattern rejects a member (i.e. it matched it) it is done.
	 * In effect we place the order of the flags as having -c last.
	 */
	pt = pathead;
	ppt = &pathead;
	while ((pt != NULL) && (pt != arcn->pat)) {
		ppt = &(pt->fow);
		pt = pt->fow;
	}

	if (pt == NULL) {
		/*
		 * should never happen....
		 */
		paxwarn(1, "Pattern list inconsistant");
		return(-1);
	}
	*ppt = pt->fow;
	free(pt);
	arcn->pat = NULL;
	return(0);
}

/*
 * pat_match()
 *	see if this archive member matches any supplied pattern, if a match
 *	is found, arcn->pat is set to point at the potential pattern. Later if
 *	this archive member is "selected" we process and mark the pattern as
 *	one which matched a selected archive member (see pat_sel())
 * Return:
 *	0 if this archive member should be processed, 1 if it should be
 *	skipped and -1 if we are done with all patterns (and pax should quit
 *	looking for more members)
 */

int
pat_match(ARCHD *arcn)
{
	PATTERN *pt;

	arcn->pat = NULL;

	/*
	 * if there are no more patterns and we have -n (and not -c) we are
	 * done. otherwise with no patterns to match, matches all
	 */
	if (pathead == NULL) {
		if (nflag && !cflag)
			return(-1);
		return(0);
	}

	/*
	 * have to search down the list one at a time looking for a match.
	 */
	pt = pathead;
	while (pt != NULL) {
		/*
		 * check for a file name match unless we have DIR_MTCH set in
		 * this pattern then we want a prefix match
		 */
		if (pt->flgs & DIR_MTCH) {
			/*
			 * this pattern was matched before to a directory
			 * as we must have -n set for this (but not -d). We can
			 * only match CHILDREN of that directory so we must use
			 * an exact prefix match (no wildcards).
			 */
			if ((arcn->name[pt->plen] == '/') &&
			    (strncmp(pt->pstr, arcn->name, pt->plen) == 0))
				break;
		} else if (fn_match(pt->pstr, arcn->name, &pt->pend) == 0)
			break;
		pt = pt->fow;
	}

	/*
	 * return the result, remember that cflag (-c) inverts the sense of a
	 * match
	 */
	if (pt == NULL)
		return(cflag ? 0 : 1);

	/*
	 * We had a match, now when we invert the sense (-c) we reject this
	 * member. However we have to tag the pattern a being successful, (in a
	 * match, not in selecting an archive member) so we call pat_sel() here.
	 */
	arcn->pat = pt;
	if (!cflag)
		return(0);

	if (pat_sel(arcn) < 0)
		return(-1);
	arcn->pat = NULL;
	return(1);
}

/*
 * fn_match()
 * Return:
 *	0 if this archive member should be processed, 1 if it should be
 *	skipped and -1 if we are done with all patterns (and pax should quit
 *	looking for more members)
 *	Note: *pend may be changed to show where the prefix ends.
 */

static int
fn_match(char *pattern, char *string, char **pend)
{
	char c;
	char test;

	*pend = NULL;
	for (;;) {
		switch (c = *pattern++) {
		case '\0':
			/*
			 * Ok we found an exact match
			 */
			if (*string == '\0')
				return(0);

			/*
			 * Check if it is a prefix match
			 */
			if ((dflag == 1) || (*string != '/'))
				return(-1);

			/*
			 * It is a prefix match, remember where the trailing
			 * / is located
			 */
			*pend = string;
			return(0);
		case '?':
			if ((test = *string++) == '\0')
				return (-1);
			break;
		case '*':
			c = *pattern;
			/*
			 * Collapse multiple *'s.
			 */
			while (c == '*')
				c = *++pattern;

			/*
			 * Optimized hack for pattern with a * at the end
			 */
			if (c == '\0')
				return (0);

			/*
			 * General case, use recursion.
			 */
			while ((test = *string) != '\0') {
				if (!fn_match(pattern, string, pend))
					return (0);
				++string;
			}
			return (-1);
		case '[':
			/*
			 * range match
			 */
			if (((test = *string++) == '\0') ||
			    ((pattern = range_match(pattern, test)) == NULL))
				return (-1);
			break;
		case '\\':
		default:
			if (c != *string++)
				return (-1);
			break;
		}
	}
	/* NOTREACHED */
}

static char *
range_match(char *pattern, int test)
{
	char c;
	char c2;
	int negate;
	int ok = 0;

	if ((negate = (*pattern == '!')) != 0)
		++pattern;

	while ((c = *pattern++) != ']') {
		/*
		 * Illegal pattern
		 */
		if (c == '\0')
			return (NULL);

		if ((*pattern == '-') && ((c2 = pattern[1]) != '\0') &&
		    (c2 != ']')) {
			if ((c <= test) && (test <= c2))
				ok = 1;
			pattern += 2;
		} else if (c == test)
			ok = 1;
	}
	return (ok == negate ? NULL : pattern);
}

/*
 * mod_name()
 *	modify a selected file name. first attempt to apply replacement string
 *	expressions, then apply interactive file rename. We apply replacement
 *	string expressions to both filenames and file links (if we didn't the
 *	links would point to the wrong place, and we could never be able to
 *	move an archive that has a file link in it). When we rename files
 *	interactively, we store that mapping (old name to user input name) so
 *	if we spot any file links to the old file name in the future, we will
 *	know exactly how to fix the file link.
 * Return:
 *	0 continue to  process file, 1 skip this file, -1 pax is finished
 */

int
mod_name(ARCHD *arcn)
{
	int res = 0;

	/*
	 * Strip off leading '/' if appropriate.
	 * Currently, this option is only set for the tar format.
	 */
	if (rmleadslash && arcn->name[0] == '/') {
		if (arcn->name[1] == '\0') {
			arcn->name[0] = '.';
		} else {
			(void)memmove(arcn->name, &arcn->name[1],
			    strlen(arcn->name));
			arcn->nlen--;
		}
		if (rmleadslash < 2) {
			rmleadslash = 2;
			paxwarn(0, "Removing leading / from absolute path names in the archive");
		}
	}
	if (rmleadslash && arcn->ln_name[0] == '/' &&
	    (arcn->type == PAX_HLK || arcn->type == PAX_HRG)) {
		if (arcn->ln_name[1] == '\0') {
			arcn->ln_name[0] = '.';
		} else {
			(void)memmove(arcn->ln_name, &arcn->ln_name[1],
			    strlen(arcn->ln_name));
			arcn->ln_nlen--;
		}
		if (rmleadslash < 2) {
			rmleadslash = 2;
			paxwarn(0, "Removing leading / from absolute path names in the archive");
		}
	}

	/*
	 * IMPORTANT: We have a problem. what do we do with symlinks?
	 * Modifying a hard link name makes sense, as we know the file it
	 * points at should have been seen already in the archive (and if it
	 * wasn't seen because of a read error or a bad archive, we lose
	 * anyway). But there are no such requirements for symlinks. On one
	 * hand the symlink that refers to a file in the archive will have to
	 * be modified to so it will still work at its new location in the
	 * file system. On the other hand a symlink that points elsewhere (and
	 * should continue to do so) should not be modified. There is clearly
	 * no perfect solution here. So we handle them like hardlinks. Clearly
	 * a replacement made by the interactive rename mapping is very likely
	 * to be correct since it applies to a single file and is an exact
	 * match. The regular expression replacements are a little harder to
	 * justify though. We claim that the symlink name is only likely
	 * to be replaced when it points within the file tree being moved and
	 * in that case it should be modified. what we really need to do is to
	 * call an oracle here. :)
	 */
	if (rephead != NULL) {
		/*
		 * we have replacement strings, modify the name and the link
		 * name if any.
		 */
		if ((res = rep_name(arcn->name, &(arcn->nlen), 1)) != 0)
			return(res);

		if (((arcn->type == PAX_SLK) || (arcn->type == PAX_HLK) ||
		    (arcn->type == PAX_HRG)) &&
		    ((res = rep_name(arcn->ln_name, &(arcn->ln_nlen), 0)) != 0))
			return(res);
	}

	if (iflag) {
		/*
		 * perform interactive file rename, then map the link if any
		 */
		if ((res = tty_rename(arcn)) != 0)
			return(res);
		if ((arcn->type == PAX_SLK) || (arcn->type == PAX_HLK) ||
		    (arcn->type == PAX_HRG))
			sub_name(arcn->ln_name, &(arcn->ln_nlen), sizeof(arcn->ln_name));
	}
	return(res);
}

/*
 * tty_rename()
 *	Prompt the user for a replacement file name. A "." keeps the old name,
 *	a empty line skips the file, and an EOF on reading the tty, will cause
 *	pax to stop processing and exit. Otherwise the file name input, replaces
 *	the old one.
 * Return:
 *	0 process this file, 1 skip this file, -1 we need to exit pax
 */

static int
tty_rename(ARCHD *arcn)
{
	char tmpname[PAXPATHLEN+2];
	int res;

	/*
	 * prompt user for the replacement name for a file, keep trying until
	 * we get some reasonable input. Archives may have more than one file
	 * on them with the same name (from updates etc). We print verbose info
	 * on the file so the user knows what is up.
	 */
	tty_prnt("\nATTENTION: %s interactive file rename operation.\n", argv0);

	for (;;) {
		ls_tty(arcn);
		tty_prnt("Input new name, or a \".\" to keep the old name, ");
		tty_prnt("or a \"return\" to skip this file.\n");
		tty_prnt("Input > ");
		if (tty_read(tmpname, sizeof(tmpname)) < 0)
			return(-1);
		if (strcmp(tmpname, "..") == 0) {
			tty_prnt("Try again, illegal file name: ..\n");
			continue;
		}
		if (strlen(tmpname) > PAXPATHLEN) {
			tty_prnt("Try again, file name too long\n");
			continue;
		}
		break;
	}

	/*
	 * empty file name, skips this file. a "." leaves it alone
	 */
	if (tmpname[0] == '\0') {
		tty_prnt("Skipping file.\n");
		return(1);
	}
	if ((tmpname[0] == '.') && (tmpname[1] == '\0')) {
		tty_prnt("Processing continues, name unchanged.\n");
		return(0);
	}

	/*
	 * ok the name changed. We may run into links that point at this
	 * file later. we have to remember where the user sent the file
	 * in order to repair any links.
	 */
	tty_prnt("Processing continues, name changed to: %s\n", tmpname);
	res = add_name(arcn->name, arcn->nlen, tmpname);
	arcn->nlen = l_strncpy(arcn->name, tmpname, sizeof(arcn->name) - 1);
	arcn->name[arcn->nlen] = '\0';
	if (res < 0)
		return(-1);
	return(0);
}

/*
 * set_dest()
 *	fix up the file name and the link name (if any) so this file will land
 *	in the destination directory (used during copy() -rw).
 * Return:
 *	0 if ok, -1 if failure (name too long)
 */

int
set_dest(ARCHD *arcn, char *dest_dir, int dir_len)
{
	if (fix_path(arcn->name, &(arcn->nlen), dest_dir, dir_len) < 0)
		return(-1);

	/*
	 * It is really hard to deal with symlinks here, we cannot be sure
	 * if the name they point was moved (or will be moved). It is best to
	 * leave them alone.
	 */
	if ((arcn->type != PAX_HLK) && (arcn->type != PAX_HRG))
		return(0);

	if (fix_path(arcn->ln_name, &(arcn->ln_nlen), dest_dir, dir_len) < 0)
		return(-1);
	return(0);
}

/*
 * fix_path
 *	concatenate dir_name and or_name and store the result in or_name (if
 *	it fits). This is one ugly function.
 * Return:
 *	0 if ok, -1 if the final name is too long
 */

static int
fix_path( char *or_name, int *or_len, char *dir_name, int dir_len)
{
	char *src;
	char *dest;
	char *start;
	int len;

	/*
	 * we shift the or_name to the right enough to tack in the dir_name
	 * at the front. We make sure we have enough space for it all before
	 * we start. since dest always ends in a slash, we skip of or_name
	 * if it also starts with one.
	 */
	start = or_name;
	src = start + *or_len;
	dest = src + dir_len;
	if (*start == '/') {
		++start;
		--dest;
	}
	if ((len = dest - or_name) > PAXPATHLEN) {
		paxwarn(1, "File name %s/%s, too long", dir_name, start);
		return(-1);
	}
	*or_len = len;

	/*
	 * enough space, shift
	 */
	while (src >= start)
		*dest-- = *src--;
	src = dir_name + dir_len - 1;

	/*
	 * splice in the destination directory name
	 */
	while (src >= dir_name)
		*dest-- = *src--;

	*(or_name + len) = '\0';
	return(0);
}

/*
 * rep_name()
 *	walk down the list of replacement strings applying each one in order.
 *	when we find one with a successful substitution, we modify the name
 *	as specified. if required, we print the results. if the resulting name
 *	is empty, we will skip this archive member. We use the regexp(3)
 *	routines (regexp() ought to win a prize as having the most cryptic
 *	library function manual page).
 *	--Parameters--
 *	name is the file name we are going to apply the regular expressions to
 *	(and may be modified)
 *	nlen is the length of this name (and is modified to hold the length of
 *	the final string).
 *	prnt is a flag that says whether to print the final result.
 * Return:
 *	0 if substitution was successful, 1 if we are to skip the file (the name
 *	ended up empty)
 */

static int
rep_name(char *name, int *nlen, int prnt)
{
	REPLACE *pt;
	char *inpt;
	char *outpt;
	char *endpt;
	char *rpt;
	int found = 0;
	int res;
#	ifndef NET2_REGEX
	regmatch_t pm[MAXSUBEXP];
#	endif
	char nname[PAXPATHLEN+1];	/* final result of all replacements */
	char buf1[PAXPATHLEN+1];	/* where we work on the name */

	/*
	 * copy the name into buf1, where we will work on it. We need to keep
	 * the orig string around so we can print out the result of the final
	 * replacement. We build up the final result in nname. inpt points at
	 * the string we apply the regular expression to. prnt is used to
	 * suppress printing when we handle replacements on the link field
	 * (the user already saw that substitution go by)
	 */
	pt = rephead;
	(void)strcpy(buf1, name);
	inpt = buf1;
	outpt = nname;
	endpt = outpt + PAXPATHLEN;

	/*
	 * try each replacement string in order
	 */
	while (pt != NULL) {
		do {
			/*
			 * check for a successful substitution, if not go to
			 * the next pattern, or cleanup if we were global
			 */
#			ifdef NET2_REGEX
			if (regexec(pt->rcmp, inpt) == 0)
#			else
			if (regexec(&(pt->rcmp), inpt, MAXSUBEXP, pm, 0) != 0)
#			endif
				break;

			/*
			 * ok we found one. We have three parts, the prefix
			 * which did not match, the section that did and the
			 * tail (that also did not match). Copy the prefix to
			 * the final output buffer (watching to make sure we
			 * do not create a string too long).
			 */
			found = 1;
#			ifdef NET2_REGEX
			rpt = pt->rcmp->startp[0];
#			else
			rpt = inpt + pm[0].rm_so;
#			endif

			while ((inpt < rpt) && (outpt < endpt))
				*outpt++ = *inpt++;
			if (outpt == endpt)
				break;

			/*
			 * for the second part (which matched the regular
			 * expression) apply the substitution using the
			 * replacement string and place it the prefix in the
			 * final output. If we have problems, skip it.
			 */
#			ifdef NET2_REGEX
			if ((res = resub(pt->rcmp,pt->nstr,outpt,endpt)) < 0) {
#			else
			if ((res = resub(&(pt->rcmp),pm,pt->nstr,outpt,endpt))
			    < 0) {
#			endif
				if (prnt)
					paxwarn(1, "Replacement name error %s",
					    name);
				return(1);
			}
			outpt += res;

			/*
			 * we set up to look again starting at the first
			 * character in the tail (of the input string right
			 * after the last character matched by the regular
			 * expression (inpt always points at the first char in
			 * the string to process). If we are not doing a global
			 * substitution, we will use inpt to copy the tail to
			 * the final result. Make sure we do not overrun the
			 * output buffer
			 */
#			ifdef NET2_REGEX
			inpt = pt->rcmp->endp[0];
#			else
			inpt += pm[0].rm_eo - pm[0].rm_so;
#			endif

			if ((outpt == endpt) || (*inpt == '\0'))
				break;

			/*
			 * if the user wants global we keep trying to
			 * substitute until it fails, then we are done.
			 */
		} while (pt->flgs & GLOB);

		if (found)
			break;

		/*
		 * a successful substitution did NOT occur, try the next one
		 */
		pt = pt->fow;
	}

	if (found) {
		/*
		 * we had a substitution, copy the last tail piece (if there is
		 * room) to the final result
		 */
		while ((outpt < endpt) && (*inpt != '\0'))
			*outpt++ = *inpt++;

		*outpt = '\0';
		if ((outpt == endpt) && (*inpt != '\0')) {
			if (prnt)
				paxwarn(1,"Replacement name too long %s >> %s",
				    name, nname);
			return(1);
		}

		/*
		 * inform the user of the result if wanted
		 */
		if (prnt && (pt->flgs & PRNT)) {
			if (*nname == '\0')
				(void)fprintf(stderr,"%s >> <empty string>\n",
				    name);
			else
				(void)fprintf(stderr,"%s >> %s\n", name, nname);
		}

		/*
		 * if empty inform the caller this file is to be skipped
		 * otherwise copy the new name over the orig name and return
		 */
		if (*nname == '\0')
			return(1);
		*nlen = l_strncpy(name, nname, PAXPATHLEN + 1);
		name[PAXPATHLEN] = '\0';
	}
	return(0);
}

#ifdef NET2_REGEX
/*
 * resub()
 *	apply the replacement to the matched expression. expand out the old
 * 	style ed(1) subexpression expansion.
 * Return:
 *	-1 if error, or the number of characters added to the destination.
 */

static int
resub(regexp *prog, char *src, char *dest, char *destend)
{
	char *spt;
	char *dpt;
	char c;
	int no;
	int len;

	spt = src;
	dpt = dest;
	while ((dpt < destend) && ((c = *spt++) != '\0')) {
		if (c == '&')
			no = 0;
		else if ((c == '\\') && (*spt >= '0') && (*spt <= '9'))
			no = *spt++ - '0';
		else {
 			if ((c == '\\') && ((*spt == '\\') || (*spt == '&')))
 				c = *spt++;
 			*dpt++ = c;
			continue;
		}
 		if ((prog->startp[no] == NULL) || (prog->endp[no] == NULL) ||
		    ((len = prog->endp[no] - prog->startp[no]) <= 0))
			continue;

		/*
		 * copy the subexpression to the destination.
		 * fail if we run out of space or the match string is damaged
		 */
		if (len > (destend - dpt))
			len = destend - dpt;
		if (l_strncpy(dpt, prog->startp[no], len) != len)
			return(-1);
		dpt += len;
	}
	return(dpt - dest);
}

#else

/*
 * resub()
 *	apply the replacement to the matched expression. expand out the old
 * 	style ed(1) subexpression expansion.
 * Return:
 *	-1 if error, or the number of characters added to the destination.
 */

static int
resub(regex_t *rp, regmatch_t *pm, char *src, char *dest,
	char *destend)
{
	char *spt;
	char *dpt;
	char c;
	regmatch_t *pmpt;
	int len;
	int subexcnt;

	spt =  src;
	dpt = dest;
	subexcnt = rp->re_nsub;
	while ((dpt < destend) && ((c = *spt++) != '\0')) {
		/*
		 * see if we just have an ordinary replacement character
		 * or we refer to a subexpression.
		 */
		if (c == '&') {
			pmpt = pm;
		} else if ((c == '\\') && (*spt >= '0') && (*spt <= '9')) {
			/*
			 * make sure there is a subexpression as specified
			 */
			if ((len = *spt++ - '0') > subexcnt)
				return(-1);
			pmpt = pm + len;
		} else {
 			/*
			 * Ordinary character, just copy it
			 */
 			if ((c == '\\') && ((*spt == '\\') || (*spt == '&')))
 				c = *spt++;
 			*dpt++ = c;
			continue;
		}

		/*
		 * continue if the subexpression is bogus
		 */
		if ((pmpt->rm_so < 0) || (pmpt->rm_eo < 0) ||
		    ((len = pmpt->rm_eo - pmpt->rm_so) <= 0))
			continue;

		/*
		 * copy the subexpression to the destination.
		 * fail if we run out of space or the match string is damaged
		 */
		if (len > (destend - dpt))
			len = destend - dpt;
		if (l_strncpy(dpt, src + pmpt->rm_so, len) != len)
			return(-1);
		dpt += len;
	}
	return(dpt - dest);
}
#endif
OpenPOWER on IntegriCloud