aboutsummaryrefslogtreecommitdiff
path: root/binutils/ar.c
blob: 32d1de1605847c9dfd4adc24399147be7341def6 (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
/* ar.c - Archive modify and extract.
   Copyright 1991, 1992, 1994 Free Software Foundation, Inc.

This file is part of GNU Binutils.

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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

/*
   Bugs: should use getopt the way tar does (complete w/optional -) and
   should have long options too. GNU ar used to check file against filesystem
   in quick_update and replace operations (would check mtime). Doesn't warn
   when name truncated. No way to specify pos_end. Error messages should be
   more consistant.
*/
#include "bfd.h"
#include "sysdep.h"
#include "bucomm.h"
#include "aout/ar.h"
#include "libbfd.h"
#include "arsup.h"
#include <stdio.h>
#ifdef POSIX_UTIME
#include <utime.h>
#else /* ! POSIX_UTIME */
#ifdef	USE_UTIME
#include <time.h>
#else /* ! USE_UTIME */
#include <sys/time.h>
#endif /* ! USE_UTIME */
#endif /* ! POSIX_UTIME */
#include <errno.h>
#ifndef errno
extern int errno;
#endif
#define BUFSIZE 8192

#ifdef __GO32___
#define EXT_NAME_LEN 3 /* bufflen of addition to name if it's MS-DOS */
#else
#define EXT_NAME_LEN 6 /* ditto for *NIX */
#endif

/* Kludge declaration from BFD!  This is ugly!  FIXME!  XXX */

struct ar_hdr *
bfd_special_undocumented_glue PARAMS ((bfd *abfd, char *filename));

/* Forward declarations */

static void
print_contents PARAMS ((bfd * member));

static void
delete_members PARAMS ((char **files_to_delete));

static void
do_quick_append PARAMS ((char *archive_filename, char **files_to_append));

static void
move_members PARAMS ((char **files_to_move));

static void
replace_members PARAMS ((char **files_to_replace));

static void
print_descr PARAMS ((bfd * abfd));

static void
ranlib_only PARAMS ((char *archname));

/** Globals and flags */

bfd            *inarch;		/* The input arch we're manipulating */

int mri_mode;
/* This flag distinguishes between ar and ranlib:
   1 means this is 'ranlib'; 0 means this is 'ar'.
   -1 means if we should use argv[0] to decide. */
extern int is_ranlib;
/* Nonzero means don't warn about creating the archive file if necessary.  */
int             silent_create = 0;
/* Nonzero means describe each action performed.  */
int             verbose = 0;
/* Nonzero means preserve dates of members when extracting them.  */
int             preserve_dates = 0;
/*
   Nonzero means don't replace existing members whose dates are more recent
   than the corresponding files.
*/
int             newer_only = 0;

/* Controls the writing of an archive symbol table (in BSD: a __.SYMDEF
   member).  -1 means we've been explicitly asked to not write a symbol table;
   +1 means we've been explictly asked to write it;
   0 is the default.
   Traditionally, the default in BSD has been to not write the table.
   However, for Posix.2 compliance the default is now to write a symbol table
   if any of the members are object files. */
int write_armap = 0;

/*
   Nonzero means it's the name of an existing member; position new or moved
   files with respect to this one.
*/
char           *posname = NULL;
/*
   Sez how to use `posname': pos_before means position before that member.
   pos_after means position after that member. pos_end means always at end.
   pos_default means default appropriately. For the latter two, `posname'
   should also be zero.
*/
enum pos {
    pos_default, pos_before, pos_after, pos_end
}               postype = pos_default;

int interactive = 0;
void
DEFUN_VOID(mri_emul)
{
  interactive = isatty(fileno(stdin)) ;
  yyparse();
}

/*
   If count is 0, then function is called once on each entry. if nonzero,
   count is the length of the files chain; function is called on each entry
   whose name matches one in files
*/
void
DEFUN(map_over_members,(function, files, count),
      void            (*function) () AND
      char          **files AND
      int             count)
{
  bfd            *head;

  if (count == 0) {
    for (head = inarch->next; head; head = head->next)
     function(head);
    return;
  }
  /*
    This may appear to be a baroque way of accomplishing what we want.
    however we have to iterate over the filenames in order to notice where
    a filename is requested but does not exist in the archive.  Ditto
    mapping over each file each time -- we want to hack multiple
    references.
    */

  for (; count > 0; files++, count--) {
    boolean         found = false;
    for (head = inarch->next; head; head = head->next)
    {
      if (head->filename == NULL)
      {
	/* Some archive formats don't get the filenames filled in
	   'till the elements are opened */
	struct stat buf;
	bfd_stat_arch_elt(head, &buf);
      }
      if ((head->filename != NULL) &&
	  (!strcmp(*files, head->filename))) {
	found = true;
	function(head);
      }
    }
    if (!found)
     fprintf(stderr, "no entry %s in archive\n", *files);
  }
}


boolean operation_alters_arch = false;

extern char *program_version;

void
do_show_version ()
{
  printf ("GNU %s version %s\n", program_name, program_version);
  exit (0);
}

void
usage ()
{
  if (is_ranlib == 0)
    fprintf(stderr, "\
Usage: %s [-]{dmpqrtx}[abcilosuvV] [member-name] archive-file file...\n\
       %s -M [<mri-script]\n",
	    program_name, program_name);
  else
    fprintf(stderr, "\
Usage: %s [-vV] archive\n", program_name);
  exit(1);
}

/*
   The option parsing should be in its own function.  It will be when I have
   getopt working.
*/
int
main(argc, argv)
    int             argc;
    char          **argv;
{
  char           *arg_ptr;
  char            c;
  enum {
    none = 0, delete, replace, print_table,
    print_files, extract, move, quick_append
  }               operation = none;
  int             arg_index;
  char          **files;
  char           *inarch_filename;
  char           *temp;
  int		 show_version;

  bfd_init();
  show_version = 0;

  program_name = argv[0];

  temp = strrchr(program_name, '/');
  if (temp == (char *) NULL)
   temp = program_name;		/* shouldn't happen, but... */
  else
   ++temp;
  if (is_ranlib > 0 || (is_ranlib < 0 && strcmp(temp, "ranlib") == 0)) {
    is_ranlib = 1;
    if (argc < 2 || argc > 3)
      usage ();
    arg_ptr = argv[1];
    if (strcmp(argv[1], "-V") == 0 || strcmp(argv[1], "-v") == 0)
      do_show_version();
    ranlib_only(arg_ptr);
  }
  else
    is_ranlib = 0;

  if (argc == 2 && strcmp(argv[1],"-M") == 0) {
    mri_emul();
    exit(0);
  }

  if (argc < 2)
    usage ();

  arg_ptr = argv[1];

  if (*arg_ptr == '-')
   ++arg_ptr;			/* compatibility */

  while ((c = *arg_ptr++) != '\0') {
    switch (c) {
     case 'd':
     case 'm':
     case 'p':
     case 'q':
     case 'r':
     case 't':
     case 'x':
      if (operation != none)
       fatal("two different operation options specified");
      switch (c) {
       case 'd':
	operation = delete;
	operation_alters_arch = true;
	break;
       case 'm':
	operation = move;
	operation_alters_arch = true;
	break;
       case 'p':
	operation = print_files;
	break;
       case 'q':
	operation = quick_append;
	operation_alters_arch = true;
	break;
       case 'r':
	operation = replace;
	operation_alters_arch = true;
	break;
       case 't':
	operation = print_table;
	break;
       case 'x':
	operation = extract;
	break;
      }
     case 'l':
      break;
     case 'c':
      silent_create = 1;
      break;
     case 'o':
      preserve_dates = 1;
      break;
     case 'V':
      show_version = true;
      break;
     case 's':
      write_armap = 1;
      break;
     case 'u':
      newer_only = 1;
      break;
     case 'v':
      verbose = 1;
      break;
     case 'a':
      postype = pos_after;
      break;
     case 'b':
      postype = pos_before;
      break;
     case 'i':
      postype = pos_before;
      break;
     case 'M':
      mri_mode = 1;
      break;
     default:
      fprintf(stderr, "%s: illegal option -- %c\n", program_name, c);
      usage ();
    }
  }

  if (show_version)
    do_show_version();

  if (argc < 3)
    usage ();

  if (mri_mode) {
    mri_emul();
  }
  else {
    if ((operation == none || operation == print_table) 
	&& write_armap == 1)
      ranlib_only(argv[2]);

    if (operation == none)
      fatal("no operation specified");

    if (newer_only && operation != replace)
      fatal("`u' is only meaningful with the `r' option.");

    arg_index = 2;

    if (postype != pos_default)
      posname = argv[arg_index++];

    inarch_filename = argv[arg_index++];

    files = arg_index < argc ? argv + arg_index : NULL;

    if (operation == quick_append)
      {
	/* Note that quick appending to a non-existent archive creates it,
	   even if there are no files to append. */
	do_quick_append(inarch_filename, files);
	exit(0);
      }

    open_inarch(inarch_filename);

    switch (operation) {

     case print_table:
      map_over_members(print_descr, files, argc - 3);
      break;

     case print_files:
      map_over_members(print_contents, files, argc - 3);
      break;

     case extract:
      map_over_members(extract_file, files, argc - 3);
      break;

     case delete:
      if (files != NULL)
       delete_members(files);
      break;

     case move:
      if (files != NULL)
       move_members(files);
      break;

     case replace:
      if (files != NULL || write_armap > 0)
       replace_members(files);
      break;

      /* Shouldn't happen! */
     default:
      fprintf(stderr, "%s: internal error -- this option not implemented\n",
	      program_name);
      exit (1);
    }
  }
  return (0);
}				/* main() */

static
char *normalize(file)
char *file;
{
    char *    filename = strrchr(file, '/');
    if (filename != (char *)NULL) {
	filename ++;
    }
    else {
	filename = file;
    }
    return filename;
}

int 
open_inarch(archive_filename)
    char           *archive_filename;
{
    bfd           **last_one;
    bfd            *next_one;
    struct stat     sbuf;
    bfd_error = no_error;

    if (stat(archive_filename, &sbuf) != 0) {

#ifndef __GO32__

/* KLUDGE ALERT! Temporary fix until I figger why
 * stat() is wrong ... think it's buried in GO32's IDT
 * - Jax
 */
	if (errno != ENOENT)
	    bfd_fatal(archive_filename);
#endif

	if (!operation_alters_arch) {
	  fprintf (stderr, "%s: ", program_name);
	  perror (archive_filename);
	  maybequit();
	  return 0;
	}	

	/* This routine is one way to forcibly create the archive. */

	do_quick_append(archive_filename, 0);
    }

    inarch = bfd_openr(archive_filename, NULL);
    if (inarch == NULL) {

      bloser:

        fprintf (stderr, "%s: ", program_name);
	bfd_perror(archive_filename);
	exit(1);
    }

    if (bfd_check_format(inarch, bfd_archive) != true)
	fatal("%s is not an archive", archive_filename);
    last_one = &(inarch->next);
    /* Read all the contents right away, regardless. */
    for (next_one = bfd_openr_next_archived_file(inarch, NULL);
	 next_one;
	 next_one = bfd_openr_next_archived_file(inarch, next_one)) {
	*last_one = next_one;
	last_one = &next_one->next;
    }
    *last_one = (bfd *) NULL;
    if (bfd_error != no_more_archived_files)
	goto bloser;
    return 1;
}





static void
print_contents(abfd)
    bfd            *abfd;
{
    int             ncopied = 0;
    struct stat     buf;
    long            size;
    if (bfd_stat_arch_elt(abfd, &buf) != 0)
	fatal("internal stat error on %s", bfd_get_filename (abfd));

    if (verbose)
	printf("\n<member %s>\n\n", bfd_get_filename (abfd));

    bfd_seek(abfd, 0, SEEK_SET);

    size = buf.st_size;
    while (ncopied < size) {
	char            cbuf[BUFSIZE];
	int             nread;
	int             tocopy = size - ncopied;
	if (tocopy > BUFSIZE)
	    tocopy = BUFSIZE;

	nread = bfd_read(cbuf, 1, tocopy, abfd);	/* oops -- broke
							   abstraction!  */

	if (nread != tocopy)
	    fatal("%s is not a valid archive", abfd->my_archive->filename);
	fwrite(cbuf, 1, nread, stdout);
	ncopied += tocopy;
    }
}


/*
   Extract a member of the archive into its own file.

We defer opening the new file until after we have read a BUFSIZ chunk of the
   old one, since we know we have just read the archive header for the old
   one.  Since most members are shorter than BUFSIZ, this means we will read
   the old header, read the old data, write a new inode for the new file, and
   write the new data, and be done. This 'optimization' is what comes from
   sitting next to a bare disk and hearing it every time it seeks.  -- Gnu
   Gilmore
*/

void
extract_file(abfd)
    bfd            *abfd;
{
    FILE           *ostream;
    char            cbuf[BUFSIZE];
    int             nread,
                    tocopy;
    int             ncopied = 0;
    long            size;
    struct stat     buf;
    if (bfd_stat_arch_elt(abfd, &buf) != 0)
	fatal("internal stat error on %s", bfd_get_filename (abfd));
    size = buf.st_size;

    if (verbose)
	printf("x - %s\n", bfd_get_filename (abfd));

    bfd_seek(abfd, 0, SEEK_SET);

    ostream = 0;
    if (size == 0) {
      /* Seems like an abstraction violation, eh?  Well it's OK! */
      ostream = fopen(bfd_get_filename (abfd), FOPEN_WB);
      if (!ostream) {
	perror(bfd_get_filename (abfd));
	exit(1);
      }
    } else
    while (ncopied < size) {
	tocopy = size - ncopied;
	if (tocopy > BUFSIZE)
	    tocopy = BUFSIZE;

	nread = bfd_read(cbuf, 1, tocopy, abfd);
	if (nread != tocopy)
	    fatal("%s is not a valid archive", abfd->my_archive->filename);

	/* See comment above; this saves disk arm motion */
	if (!ostream) {
	    /* Seems like an abstraction violation, eh?  Well it's OK! */
	    ostream = fopen(bfd_get_filename (abfd), FOPEN_WB);
	    if (!ostream) {
		perror(bfd_get_filename (abfd));
		exit(1);
	    }
	}
	fwrite(cbuf, 1, nread, ostream);
	ncopied += tocopy;
    }

    fclose(ostream);
    chmod(bfd_get_filename (abfd), buf.st_mode);

    if (preserve_dates) {
#ifdef POSIX_UTIME
        struct utimbuf	tb;
	tb.actime = buf.st_mtime;
	tb.modtime = buf.st_mtime;
	utime(bfd_get_filename (abfd), &tb);	/* FIXME check result */
#else /* ! POSIX_UTIME */
#ifdef USE_UTIME
	long            tb[2];
	tb[0] = buf.st_mtime;
	tb[1] = buf.st_mtime;
	utime(bfd_get_filename (abfd), tb);	/* FIXME check result */
#else /* ! USE_UTIME */
	struct timeval  tv[2];
	tv[0].tv_sec = buf.st_mtime;
	tv[0].tv_usec = 0;
	tv[1].tv_sec = buf.st_mtime;
	tv[1].tv_usec = 0;
	utimes(bfd_get_filename (abfd), tv);	/* FIXME check result */
#endif /* ! USE_UTIME */
#endif /* ! POSIX_UTIME */
    }
}


/* Just do it quickly; don't worry about dups, armap, or anything like that */

static void
do_quick_append(archive_filename, files_to_append)
    char           *archive_filename;
    char          **files_to_append;

{
    FILE           *ofile,
                   *ifile;
    char            buf[BUFSIZE];
    long            tocopy,
                    thistime;
    bfd            *temp;
    struct stat     sbuf;
    boolean         newfile = false;
    bfd_error = no_error;

    if (stat(archive_filename, &sbuf) != 0) {

#ifndef __GO32__

/* KLUDGE ALERT! Temporary fix until I figger why
 * stat() is wrong ... think it's buried in GO32's IDT
 * - Jax
 */

	if (errno != ENOENT)
	    bfd_fatal(archive_filename);
#endif

	newfile = true;
    }


    ofile = fopen(archive_filename, FOPEN_AUB);
    if (ofile == NULL) {
	perror(program_name);
	exit(1);
    }

    temp = bfd_openr(archive_filename, NULL);
    if (temp == NULL) {
        fprintf (stderr, "%s: ", program_name);
	bfd_perror(archive_filename);
	exit(1);
    }
    if (newfile == false) {
	if (bfd_check_format(temp, bfd_archive) != true)
	    fatal("%s is not an archive", archive_filename);
    }
    else {
	fwrite(ARMAG, 1, SARMAG, ofile);
	if (!silent_create)
	    fprintf(stderr, "%s: creating %s\n",
		    program_name, archive_filename);
    }

    /* assume it's an achive, go straight to the end, sans $200 */
    fseek(ofile, 0, 2);

    for (; files_to_append && *files_to_append; ++files_to_append) {
	struct ar_hdr  *hdr = bfd_special_undocumented_glue(temp, *files_to_append);
	if (hdr == NULL) {
	    fprintf (stderr, "%s: ", program_name);
	    bfd_perror(*files_to_append);
	    exit(1);
	}

	BFD_SEND(temp, _bfd_truncate_arname, (temp, *files_to_append, (char *) hdr));

	ifile = fopen(*files_to_append, FOPEN_RB);
	if (ifile == NULL)
	  {
	    bfd_perror(program_name);
	  }

	if (stat(*files_to_append, &sbuf) != 0)
	  {
	    fprintf (stderr, "%s: ", program_name);
	    bfd_perror(*files_to_append);
	  }

	tocopy = sbuf.st_size;

	/* XXX should do error-checking! */
	fwrite(hdr, 1, sizeof(struct ar_hdr), ofile);


	while (tocopy > 0) {
	    thistime = tocopy;
	    if (thistime > BUFSIZE)
		thistime = BUFSIZE;
	    fread(buf, 1, thistime, ifile);
	    fwrite(buf, 1, thistime, ofile);
	    tocopy -= thistime;
	}
	fclose(ifile);
	if ((sbuf.st_size % 2) == 1)
	    putc('\n', ofile);
    }
    fclose(ofile);
    bfd_close(temp);
}


void
write_archive()
{
    bfd            *obfd;
    int             namelen = strlen(inarch->filename);
    char           *new_name = xmalloc(namelen + EXT_NAME_LEN);
    bfd            *contents_head = inarch->next;

	strcpy(new_name, inarch->filename);

#ifdef __GO32__	/* avoid long .extensions for MS-DOS */
	strcpy(new_name + namelen, "-a");
#else
	strcpy(new_name + namelen, "-art");
#endif

	obfd = bfd_openw(new_name,
		 /* FIXME: violates abstraction; need a better protocol */
			 (inarch->xvec ? bfd_get_target(inarch) : NULL));

	if (obfd == NULL)
	    bfd_fatal(inarch->filename);

	bfd_set_format(obfd, bfd_archive);

	/* Request writing the archive symbol table unless we've
	   been explicitly requested not to. */
	obfd->has_armap = write_armap >= 0;

	if (bfd_set_archive_head(obfd, contents_head) != true)
	    bfd_fatal(inarch->filename);

	if (!bfd_close(obfd))
	    bfd_fatal(inarch->filename);

	/* We don't care if this fails, we might be creating the
	   archive */
	(void) unlink(inarch->filename);

	if (rename(new_name, inarch->filename) != 0)
	    bfd_fatal(inarch->filename);
}



/*
   returns a pointer to the pointer to the entry which should be rplacd'd
   into when altering.  default_pos should be how to interpret pos_default,
   and should be a pos value.
*/

bfd **
get_pos_bfd(contents, default_pos)
    bfd           **contents;
    enum pos        default_pos;
{
    bfd           **after_bfd = contents;
    enum pos        realpos = (postype == pos_default ? default_pos : postype);

    if (realpos == pos_end) {
	while (*after_bfd)
	    after_bfd = &((*after_bfd)->next);
    }
    else {
	for ( ; *after_bfd; after_bfd = &(*after_bfd)->next)
	    if (!strcmp((*after_bfd)->filename, posname)) {
		if (realpos == pos_after)
		    after_bfd = &(*after_bfd)->next;
		break;
	}
    }
    return after_bfd;
}


static void
delete_members(files_to_delete)
    char          **files_to_delete;
{
    bfd           **current_ptr_ptr;
    boolean         found;
    boolean         something_changed = false;
    for (; *files_to_delete != NULL; ++files_to_delete) {
	/*
	   In a.out systems, the armap is optional.  It's also called
	   __.SYMDEF.  So if the user asked to delete it, we should remember
	   that fact. This isn't quite right for COFF systems (where
	   __.SYMDEF might be regular member), but it's very unlikely
	   to be a problem.  FIXME */

	if (!strcmp(*files_to_delete, "__.SYMDEF")) {
	    inarch->has_armap = false;
	    write_armap = -1;
	    continue;
	}

	found = false;
	current_ptr_ptr = &(inarch->next);
	while (*current_ptr_ptr) {
	    if (strcmp(*files_to_delete, (*current_ptr_ptr)->filename) == 0) {
		found = true;
		something_changed = true;
		if (verbose)
		    printf("d - %s\n",
			   *files_to_delete);
		*current_ptr_ptr = ((*current_ptr_ptr)->next);
		goto next_file;

	    }
	    else {
		current_ptr_ptr = &((*current_ptr_ptr)->next);
	    }
	}

	if (verbose && found == false) {
	    printf("No member named `%s'\n", *files_to_delete);
	}
next_file:;

    }

    if (something_changed == true) {
	write_archive();
    }
}


/* Reposition existing members within an archive */

static void
move_members(files_to_move)
    char          **files_to_move;
{
    bfd           **after_bfd;	/* New entries go after this one */
    bfd           **current_ptr_ptr;	/* cdr pointer into contents */




    for (; *files_to_move; ++files_to_move) {
	current_ptr_ptr = &(inarch->next);
	while (*current_ptr_ptr) {
	    bfd            *current_ptr = *current_ptr_ptr;
	    if (strcmp(normalize(*files_to_move), current_ptr->filename) == 0) {
		/*
		   Move this file to the end of the list - first cut from
		   where it is.
		*/
		*current_ptr_ptr = current_ptr->next;

		/* Now glue to end */
		after_bfd = get_pos_bfd(&inarch->next, pos_end);
		*after_bfd = current_ptr;
		current_ptr->next = (bfd *) NULL;

		if (verbose)
		    printf("m - %s\n", *files_to_move);

		goto next_file;
	    }
	    current_ptr_ptr = &((*current_ptr_ptr)->next);
	}
	fprintf(stderr, "%s: no entry %s in archive %s!\n",
		program_name, *files_to_move, inarch->filename);
	exit(1);
next_file:;
    }

    write_archive();
}


/* Ought to default to replacing in place, but this is existing practice! */

static void
replace_members(files_to_move)
    char          **files_to_move;
{
    bfd           **after_bfd;	/* New entries go after this one */
    bfd            *current;
    bfd           **current_ptr;
    bfd            *temp;

    while (files_to_move && *files_to_move) {
	current_ptr = &inarch->next;
	while (*current_ptr) {
	    current = *current_ptr;
	    
	    if (!strcmp(normalize(*files_to_move), current->filename)) {
		if (newer_only) {
		    struct stat     fsbuf,
		                    asbuf;

		    if (current->arelt_data == NULL) {
		      /* This can only happen if you specify a file on the
			 command line more than once. */
		      fprintf (stderr, "%s: duplicate file specified: %s -- skipping\n", program_name, *files_to_move);
		      goto next_file;
		    }

		    if (stat(*files_to_move, &fsbuf) != 0) {
			if (errno != ENOENT)
			    bfd_fatal(*files_to_move);
			goto next_file;
		    }
		    if (bfd_stat_arch_elt(current, &asbuf) != 0)
			fatal("internal stat error on %s", current->filename);

		    if (fsbuf.st_mtime <= asbuf.st_mtime)
			goto next_file;
		}

		/* snip out this entry from the chain */
		*current_ptr = current->next;

		after_bfd = get_pos_bfd(&inarch->next, pos_end);
		temp = *after_bfd;
		*after_bfd = bfd_openr(*files_to_move, NULL);
		if (*after_bfd == (bfd *) NULL) {
		    fprintf(stderr, "%s: ", program_name);
		    bfd_perror (*files_to_move);
		    exit(1);
		}
		(*after_bfd)->next = temp;

		if (verbose) {
		    printf("%c - %s\n", (postype == pos_after ? 'r' : 'a'),
			   *files_to_move);
		}
		goto next_file;
	    }
	    current_ptr = &(current->next);
	}

	/* It isn't in there, so add to end */

	after_bfd = get_pos_bfd(&inarch->next, pos_end);
	temp = *after_bfd;
	*after_bfd = bfd_openr(*files_to_move, NULL);
	if (*after_bfd == (bfd *) NULL) {
	  fprintf(stderr, "%s: ", program_name);
	  bfd_perror (*files_to_move);
	  exit(1);
	}
	if (verbose) {
	    printf("c - %s\n", *files_to_move);
	}

	(*after_bfd)->next = temp;

next_file:;

	files_to_move++;
    }


    write_archive();
}

static void
ranlib_only(archname)
    char           *archname;
{
    write_armap = 1;
    open_inarch(archname);
    write_archive();
    exit(0);
}



/* Things which are interesting to map over all or some of the files: */

static void
print_descr(abfd)
    bfd            *abfd;
{
    print_arelt_descr(stdout,abfd, verbose);
}