bfd/vms-misc.c

   1 /* vms-misc.c -- Miscellaneous functions for VAX (openVMS/VAX) and
   2    EVAX (openVMS/Alpha) files.
   3    Copyright 1996, 1997, 1998, 1999, 2000, 2001
   4    Free Software Foundation, Inc.
   5
   6    Written by Klaus K"ampf (kkaempf@rmi.de)
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  21
  22 #if __STDC__
  23 #include <stdarg.h>
  24 #endif
  25
  26 #include "bfd.h"
  27 #include "sysdep.h"
  28 #include "bfdlink.h"
  29 #include "libbfd.h"
  30
  31 #include "vms.h"
  32
  33 static vms_section *add_new_contents PARAMS ((bfd *, sec_ptr));
  34 static int hash_string PARAMS ((const char *));
  35 static asymbol *new_symbol PARAMS ((bfd *, char *));
  36
  37 /*-----------------------------------------------------------------------------*/
  38 #if VMS_DEBUG
  39 /* debug functions */
  40
  41 /* debug function for all vms extensions
  42    evaluates environment variable VMS_DEBUG for a
  43    numerical value on the first call
  44    all error levels below this value are printed
  45
  46    levels:
  47    1    toplevel bfd calls (functions from the bfd vector)
  48    2    functions called by bfd calls
  49    ...
  50    9    almost everything
  51
  52    level is also identation level. Indentation is performed
  53    if level > 0
  54         */
  55
  56 #if __STDC__
  57 void
  58 _bfd_vms_debug (int level, char *format, ...)
  59 {
  60   static int min_level = -1;
  61   static FILE *output = NULL;
  62   char *eptr;
  63   va_list args;
  64   int abslvl = (level > 0)?level:-level;
  65
  66   if (min_level == -1)
  67     {
  68       if ((eptr = getenv("VMS_DEBUG")) != NULL)
  69         {
  70           min_level = atoi(eptr);
  71           output = stderr;
  72         }
  73       else
  74         min_level = 0;
  75     }
  76   if (output == NULL)
  77     return;
  78   if (abslvl > min_level)
  79     return;
  80
  81   while (--level>0)
  82     fprintf (output, " ");
  83   va_start(args, format);
  84   vfprintf (output, format, args);
  85   fflush(output);
  86   va_end(args);
  87
  88   return;
  89 }
  90
  91 #else /* not __STDC__ */
  92
  93 void
  94 _bfd_vms_debug (level, format, a1, a2, a3, a4, a5, a6)
  95      int level;
  96      char *format;
  97      long a1; long a2; long a3;
  98      long a4; long a5; long a6;
  99 {
 100   static int min_level = -1;
 101   static FILE *output = NULL;
 102   char *eptr;
 103
 104   if (min_level == -1)
 105     {
 106       if ((eptr = getenv("VMS_DEBUG")) != NULL)
 107         {
 108           min_level = atoi(eptr);
 109           output = stderr;
 110         }
 111       else
 112         min_level = 0;
 113     }
 114   if (output == NULL)
 115     return;
 116   if (level > min_level)
 117     return;
 118
 119   while (--level>0)
 120     fprintf (output, " ");
 121   fprintf (output, format, a1, a2, a3, a4, a5, a6);
 122   fflush(output);
 123
 124   return;
 125 }
 126 #endif /* __STDC__ */
 127
 128 /* a debug function
 129    hex dump 'size' bytes starting at 'ptr'  */
 130
 131 void
 132 _bfd_hexdump (level, ptr, size, offset)
 133      int level;
 134      unsigned char *ptr;
 135      int size;
 136      int offset;
 137 {
 138   unsigned char *lptr = ptr;
 139   int count = 0;
 140   long start = offset;
 141
 142   while (size-- > 0)
 143     {
 144       if ((count%16) == 0)
 145         vms_debug (level, "%08lx:", start);
 146       vms_debug (-level, " %02x", *ptr++);
 147       count++;
 148       start++;
 149       if (size == 0)
 150         {
 151           while ((count%16) != 0)
 152             {
 153               vms_debug (-level, "   ");
 154               count++;
 155             }
 156         }
 157       if ((count%16) == 0)
 158         {
 159           vms_debug (-level, " ");
 160           while (lptr < ptr)
 161             {
 162               vms_debug (-level, "%c", (*lptr < 32)?'.':*lptr);
 163               lptr++;
 164             }
 165           vms_debug (-level, "\n");
 166         }
 167     }
 168   if ((count%16) != 0)
 169     vms_debug (-level, "\n");
 170
 171   return;
 172 }
 173 #endif
 174 \f
 175 /* hash functions
 176
 177    These are needed when reading an object file.  */
 178
 179 /* allocate new vms_hash_entry
 180    keep the symbol name and a pointer to the bfd symbol in the table  */
 181
 182 struct bfd_hash_entry *
 183 _bfd_vms_hash_newfunc (entry, table, string)
 184      struct bfd_hash_entry *entry;
 185      struct bfd_hash_table *table;
 186      const char *string;
 187 {
 188   vms_symbol_entry *ret;
 189
 190 #if VMS_DEBUG
 191   vms_debug (5, "_bfd_vms_hash_newfunc(%p, %p, %s)\n", entry, table, string);
 192 #endif
 193
 194   if (entry == (struct bfd_hash_entry *)NULL)
 195     {
 196       ret = (vms_symbol_entry *)
 197               bfd_hash_allocate (table, sizeof (vms_symbol_entry));
 198       if (ret == (vms_symbol_entry *) NULL)
 199         {
 200           bfd_set_error (bfd_error_no_memory);
 201           return (struct bfd_hash_entry *)NULL;
 202         }
 203       entry = (struct bfd_hash_entry *) ret;
 204     }
 205
 206   /* Call the allocation method of the base class.  */
 207
 208   ret = (vms_symbol_entry *) bfd_hash_newfunc (entry, table, string);
 209 #if VMS_DEBUG
 210   vms_debug (6, "_bfd_vms_hash_newfunc ret %p\n", ret);
 211 #endif
 212
 213   ret->symbol = (asymbol *)NULL;
 214
 215   return (struct bfd_hash_entry *)ret;
 216 }
 217 \f
 218 /* object file input functions */
 219
 220 /* Return type and length from record header (buf) on Alpha.  */
 221
 222 void
 223 _bfd_vms_get_header_values (abfd, buf, type, length)
 224      bfd *abfd ATTRIBUTE_UNUSED;
 225      unsigned char *buf;
 226      int *type;
 227      int *length;
 228 {
 229   if (type != 0)
 230     *type = bfd_getl16 (buf);
 231   buf += 2;
 232   if (length != 0)
 233     *length = bfd_getl16 (buf);
 234
 235 #if VMS_DEBUG
 236   vms_debug (10, "_bfd_vms_get_header_values type %x, length %x\n", (type?*type:0), (length?*length:0));
 237 #endif
 238
 239   return;
 240 }
 241
 242 /* Get next record from object file to vms_buf
 243    set PRIV(buf_size) and return it
 244
 245    this is a little tricky since it should be portable.
 246
 247    the openVMS object file has 'variable length' which means that
 248    read() returns data in chunks of (hopefully) correct and expected
 249    size. The linker (and other tools on vms) depend on that. Unix doesn't
 250    know about 'formatted' files, so reading and writing such an object
 251    file in a unix environment is not trivial.
 252
 253    With the tool 'file' (available on all vms ftp sites), one
 254    can view and change the attributes of a file. Changing from
 255    'variable length' to 'fixed length, 512 bytes' reveals the
 256    record length at the first 2 bytes of every record. The same
 257    happens during the transfer of object files from vms to unix,
 258    at least with ucx, dec's implementation of tcp/ip.
 259
 260    The vms format repeats the length at bytes 2 & 3 of every record.
 261
 262    On the first call (file_format == FF_UNKNOWN) we check if
 263    the first and the third byte pair (!) of the record match.
 264    If they do it's an object file in an unix environment or with
 265    wrong attributes (FF_FOREIGN), else we should be in a vms
 266    environment where read() returns the record size (FF_NATIVE).
 267
 268    reading is always done in 2 steps.
 269    first just the record header is read and the length extracted
 270    by get_header_values
 271    then the read buffer is adjusted and the remaining bytes are
 272    read in.
 273
 274    all file i/o is always done on even file positions  */
 275
 276 int
 277 _bfd_vms_get_record (abfd)
 278      bfd *abfd;
 279 {
 280   int test_len, test_start, remaining;
 281   unsigned char *vms_buf;
 282
 283 #if VMS_DEBUG
 284   vms_debug (8, "_bfd_vms_get_record\n");
 285 #endif
 286
 287   /* minimum is 6 bytes on Alpha
 288      (2 bytes length, 2 bytes record id, 2 bytes length repeated)
 289
 290      on VAX there's no length information in the record
 291      so start with OBJ_S_C_MAXRECSIZ  */
 292
 293   if (PRIV (buf_size) == 0)
 294     {
 295       if (PRIV (is_vax))
 296         {
 297           PRIV (vms_buf) = (unsigned char *) malloc (OBJ_S_C_MAXRECSIZ);
 298           PRIV (buf_size) = OBJ_S_C_MAXRECSIZ;
 299           PRIV (file_format) = FF_VAX;
 300         }
 301       else
 302         PRIV (vms_buf) = (unsigned char *) malloc (6);
 303     }
 304
 305   vms_buf = PRIV (vms_buf);
 306
 307   if (vms_buf == 0)
 308     {
 309       bfd_set_error (bfd_error_no_memory);
 310       return -1;
 311     }
 312
 313   switch (PRIV (file_format))
 314     {
 315     case FF_UNKNOWN:
 316     case FF_FOREIGN:
 317       test_len = 6;                     /* probe 6 bytes */
 318       test_start = 2;                   /* where the record starts */
 319       break;
 320
 321     case FF_NATIVE:
 322       test_len = 4;
 323       test_start = 0;
 324       break;
 325
 326     default:
 327     case FF_VAX:
 328       test_len = 0;
 329       test_start = 0;
 330       break;
 331     }
 332
 333   /* skip odd alignment byte  */
 334
 335   if (bfd_tell (abfd) & 1)
 336     {
 337       if (bfd_read (PRIV (vms_buf), 1, 1, abfd) != 1)
 338         {
 339           bfd_set_error (bfd_error_file_truncated);
 340           return 0;
 341         }
 342     }
 343
 344   /* read the record header on Alpha.  */
 345
 346   if ((test_len != 0)
 347       && (bfd_read (PRIV (vms_buf), 1, test_len, abfd)
 348           != (bfd_size_type) test_len))
 349     {
 350       bfd_set_error (bfd_error_file_truncated);
 351       return 0;
 352     }
 353
 354   /* check file format on first call  */
 355
 356   if (PRIV (file_format) == FF_UNKNOWN)
 357     {                                           /* record length repeats ? */
 358       if ( (vms_buf[0] == vms_buf[4])
 359         && (vms_buf[1] == vms_buf[5]))
 360         {
 361           PRIV (file_format) = FF_FOREIGN;      /* Y: foreign environment */
 362           test_start = 2;
 363         }
 364       else
 365         {
 366           PRIV (file_format) = FF_NATIVE;       /* N: native environment */
 367           test_start = 0;
 368         }
 369     }
 370
 371   if (PRIV (is_vax))
 372     {
 373       PRIV (rec_length) = bfd_read (vms_buf, 1, PRIV (buf_size), abfd);
 374       if (PRIV (rec_length) <= 0)
 375         {
 376           bfd_set_error (bfd_error_file_truncated);
 377           return 0;
 378         }
 379       PRIV (vms_rec) = vms_buf;
 380     }
 381   else          /* Alpha  */
 382     {
 383       /* extract vms record length  */
 384
 385       _bfd_vms_get_header_values (abfd, vms_buf+test_start, NULL,
 386                                   &PRIV (rec_length));
 387
 388       if (PRIV (rec_length) <= 0)
 389         {
 390           bfd_set_error (bfd_error_file_truncated);
 391           return 0;
 392         }
 393
 394       /* that's what the linker manual says  */
 395
 396       if (PRIV (rec_length) > EOBJ_S_C_MAXRECSIZ)
 397         {
 398           bfd_set_error (bfd_error_file_truncated);
 399           return 0;
 400         }
 401
 402       /* adjust the buffer  */
 403
 404       if (PRIV (rec_length) > PRIV (buf_size))
 405         {
 406           PRIV (vms_buf) = (unsigned char *) realloc (vms_buf, PRIV (rec_length));
 407           vms_buf = PRIV (vms_buf);
 408           if (vms_buf == 0)
 409             {
 410               bfd_set_error (bfd_error_no_memory);
 411               return -1;
 412             }
 413           PRIV (buf_size) = PRIV (rec_length);
 414         }
 415
 416       /* read the remaining record  */
 417
 418       remaining = PRIV (rec_length) - test_len + test_start;
 419
 420 #if VMS_DEBUG
 421       vms_debug (10, "bfd_read remaining %d\n", remaining);
 422 #endif
 423       if (bfd_read (vms_buf + test_len, 1, remaining, abfd) !=
 424           (bfd_size_type) remaining)
 425         {
 426           bfd_set_error (bfd_error_file_truncated);
 427           return 0;
 428         }
 429       PRIV (vms_rec) = vms_buf + test_start;
 430     }
 431
 432 #if VMS_DEBUG
 433   vms_debug (11, "bfd_read rec_length %d\n", PRIV (rec_length));
 434 #endif
 435
 436   return PRIV (rec_length);
 437 }
 438
 439 /* get next vms record from file
 440    update vms_rec and rec_length to new (remaining) values  */
 441
 442 int
 443 _bfd_vms_next_record (abfd)
 444      bfd *abfd;
 445 {
 446 #if VMS_DEBUG
 447   vms_debug (8, "_bfd_vms_next_record (len %d, size %d)\n",
 448               PRIV (rec_length), PRIV (rec_size));
 449 #endif
 450
 451   if (PRIV (rec_length) > 0)
 452     {
 453       PRIV (vms_rec) += PRIV (rec_size);
 454     }
 455   else
 456     {
 457       if (_bfd_vms_get_record (abfd) <= 0)
 458         return -1;
 459     }
 460
 461   if (!PRIV (vms_rec) || !PRIV (vms_buf)
 462       || PRIV (vms_rec) >= (PRIV (vms_buf) + PRIV (buf_size)))
 463     return -1;
 464
 465   if (PRIV (is_vax))
 466     {
 467       PRIV (rec_type) = *(PRIV (vms_rec));
 468       PRIV (rec_size) = PRIV (rec_length);
 469     }
 470   else
 471     {
 472       _bfd_vms_get_header_values (abfd, PRIV (vms_rec), &PRIV (rec_type),
 473                                   &PRIV (rec_size));
 474     }
 475   PRIV (rec_length) -= PRIV (rec_size);
 476
 477 #if VMS_DEBUG
 478   vms_debug (8, "_bfd_vms_next_record: rec %p, size %d, length %d, type %d\n",
 479               PRIV (vms_rec), PRIV (rec_size), PRIV (rec_length),
 480               PRIV (rec_type));
 481 #endif
 482
 483   return PRIV (rec_type);
 484 }
 485 \f
 486 /* Copy sized string (string with fixed length) to new allocated area
 487    size is string length (size of record)  */
 488
 489 char *
 490 _bfd_vms_save_sized_string (str, size)
 491      unsigned char *str;
 492      int size;
 493 {
 494   char *newstr = bfd_malloc (size + 1);
 495
 496   if (newstr == NULL)
 497     return 0;
 498   strncpy (newstr, (char *)str, size);
 499   newstr[size] = 0;
 500
 501   return newstr;
 502 }
 503
 504 /* Copy counted string (string with length at first byte) to new allocated area
 505    ptr points to length byte on entry  */
 506
 507 char *
 508 _bfd_vms_save_counted_string (ptr)
 509      unsigned char *ptr;
 510 {
 511   int len = *ptr++;
 512
 513   return _bfd_vms_save_sized_string (ptr, len);
 514 }
 515 \f
 516 /* stack routines for vms ETIR commands */
 517
 518 /* Push value and section index  */
 519
 520 void
 521 _bfd_vms_push (abfd, val, psect)
 522      bfd *abfd;
 523      uquad val;
 524      int psect;
 525 {
 526   static int last_psect;
 527
 528 #if VMS_DEBUG
 529   vms_debug (4, "<push %016lx(%d) at %d>\n", val, psect, PRIV (stackptr));
 530 #endif
 531
 532   if (psect >= 0)
 533     last_psect = psect;
 534
 535   PRIV (stack[PRIV (stackptr)]).value = val;
 536   PRIV (stack[PRIV (stackptr)]).psect = last_psect;
 537   PRIV (stackptr)++;
 538   if (PRIV (stackptr) >= STACKSIZE)
 539     {
 540       bfd_set_error (bfd_error_bad_value);
 541       (*_bfd_error_handler) (_("Stack overflow (%d) in _bfd_vms_push"), PRIV (stackptr));
 542       exit (1);
 543     }
 544   return;
 545 }
 546
 547 /* Pop value and section index  */
 548
 549 uquad
 550 _bfd_vms_pop (abfd, psect)
 551      bfd *abfd;
 552      int *psect;
 553 {
 554   uquad value;
 555
 556   if (PRIV (stackptr) == 0)
 557     {
 558       bfd_set_error (bfd_error_bad_value);
 559       (*_bfd_error_handler) (_("Stack underflow in _bfd_vms_pop"));
 560       exit (1);
 561     }
 562   PRIV (stackptr)--;
 563   value = PRIV (stack[PRIV (stackptr)]).value;
 564   if ((psect != NULL) && (PRIV (stack[PRIV (stackptr)]).psect >= 0))
 565     *psect = PRIV (stack[PRIV (stackptr)]).psect;
 566
 567 #if VMS_DEBUG
 568   vms_debug (4, "<pop %016lx(%d)>\n", value, PRIV (stack[PRIV (stackptr)]).psect);
 569 #endif
 570
 571   return value;
 572 }
 573 \f
 574 /* object file output functions */
 575
 576 /* GAS tends to write sections in little chunks (bfd_set_section_contents)
 577    which we can't use directly. So we save the little chunks in linked
 578    lists (one per section) and write them later.  */
 579
 580 /* Add a new vms_section structure to vms_section_table
 581    - forward chaining -  */
 582
 583 static vms_section *
 584 add_new_contents (abfd, section)
 585      bfd *abfd;
 586      sec_ptr section;
 587 {
 588   vms_section *sptr, *newptr;
 589
 590   sptr = PRIV (vms_section_table)[section->index];
 591   if (sptr != NULL)
 592     return sptr;
 593
 594   newptr = (vms_section *) bfd_malloc (sizeof (vms_section));
 595   if (newptr == (vms_section *) NULL)
 596     return NULL;
 597   newptr->contents = (unsigned char *) bfd_alloc (abfd, (int)section->_raw_size);
 598   if (newptr->contents == (unsigned char *)NULL)
 599     return NULL;
 600   newptr->offset = 0;
 601   newptr->size = section->_raw_size;
 602   newptr->next = 0;
 603   PRIV (vms_section_table)[section->index] = newptr;
 604   return newptr;
 605 }
 606
 607 /* Save section data & offset to an vms_section structure
 608    vms_section_table[] holds the vms_section chain  */
 609
 610 boolean
 611 _bfd_save_vms_section (abfd, section, data, offset, count)
 612      bfd *abfd;
 613      sec_ptr section;
 614      PTR data;
 615      file_ptr offset;
 616      bfd_size_type count;
 617 {
 618   vms_section *sptr;
 619
 620   if (section->index >= VMS_SECTION_COUNT)
 621     {
 622       bfd_set_error (bfd_error_nonrepresentable_section);
 623       return false;
 624     }
 625   if (count == (bfd_size_type)0)
 626     return true;
 627   sptr = add_new_contents (abfd, section);
 628   if (sptr == NULL)
 629     return false;
 630   memcpy (sptr->contents + offset, data, (size_t) count);
 631
 632   return true;
 633 }
 634
 635 /* Get vms_section pointer to saved contents for section # index  */
 636
 637 vms_section *
 638 _bfd_get_vms_section (abfd, index)
 639      bfd *abfd;
 640      int index;
 641 {
 642   if (index >=  VMS_SECTION_COUNT)
 643     {
 644       bfd_set_error (bfd_error_nonrepresentable_section);
 645       return NULL;
 646     }
 647   return PRIV (vms_section_table)[index];
 648 }
 649 \f
 650 /* Object output routines  */
 651
 652 /* Begin new record or record header
 653    write 2 bytes rectype
 654    write 2 bytes record length (filled in at flush)
 655    write 2 bytes header type (ommitted if rechead == -1)  */
 656
 657 void
 658 _bfd_vms_output_begin (abfd, rectype, rechead)
 659      bfd *abfd;
 660      int rectype;
 661      int rechead;
 662 {
 663 #if VMS_DEBUG
 664   vms_debug (6, "_bfd_vms_output_begin(type %d, head %d)\n", rectype,
 665               rechead);
 666 #endif
 667
 668   _bfd_vms_output_short (abfd,rectype);
 669
 670   /* save current output position to fill in lenght later  */
 671
 672   if (PRIV (push_level) > 0)
 673     PRIV (length_pos) = PRIV (output_size);
 674
 675 #if VMS_DEBUG
 676   vms_debug (6, "_bfd_vms_output_begin: length_pos = %d\n",
 677               PRIV (length_pos));
 678 #endif
 679
 680   _bfd_vms_output_short (abfd,0);               /* placeholder for length */
 681
 682   if (rechead != -1)
 683     _bfd_vms_output_short (abfd,rechead);
 684
 685   return;
 686 }
 687
 688 /* Set record/subrecord alignment  */
 689
 690 void
 691 _bfd_vms_output_alignment (abfd, alignto)
 692      bfd *abfd;
 693      int alignto;
 694 {
 695 #if VMS_DEBUG
 696   vms_debug (6, "_bfd_vms_output_alignment(%d)\n", alignto);
 697 #endif
 698
 699   PRIV (output_alignment) = alignto;
 700   return;
 701 }
 702
 703 /* Prepare for subrecord fields  */
 704
 705 void
 706 _bfd_vms_output_push (abfd)
 707      bfd *abfd;
 708 {
 709 #if VMS_DEBUG
 710   vms_debug (6, "vms_output_push(pushed_size = %d)\n", PRIV (output_size));
 711 #endif
 712
 713   PRIV (push_level)++;
 714   PRIV (pushed_size) = PRIV (output_size);
 715   return;
 716 }
 717
 718 /* End of subrecord fields  */
 719
 720 void
 721 _bfd_vms_output_pop (abfd)
 722      bfd *abfd;
 723 {
 724 #if VMS_DEBUG
 725   vms_debug (6, "vms_output_pop(pushed_size = %d)\n", PRIV (pushed_size));
 726 #endif
 727
 728   _bfd_vms_output_flush (abfd);
 729   PRIV (length_pos) = 2;
 730
 731 #if VMS_DEBUG
 732   vms_debug (6, "vms_output_pop: length_pos = %d\n", PRIV (length_pos));
 733 #endif
 734
 735   PRIV (pushed_size) = 0;
 736   PRIV (push_level)--;
 737   return;
 738 }
 739
 740 /* Flush unwritten output, ends current record  */
 741
 742 void
 743 _bfd_vms_output_flush (abfd)
 744      bfd *abfd;
 745 {
 746   int real_size = PRIV (output_size);
 747   int aligncount;
 748   int length;
 749
 750 #if VMS_DEBUG
 751   vms_debug (6, "_bfd_vms_output_flush(real_size = %d, pushed_size %d at lenpos %d)\n",
 752               real_size, PRIV (pushed_size), PRIV (length_pos));
 753 #endif
 754
 755   if (PRIV (push_level) > 0)
 756     length = real_size - PRIV (pushed_size);
 757   else
 758     length = real_size;
 759
 760   if (length == 0)
 761     return;
 762   aligncount = (PRIV (output_alignment)
 763                 - (length % PRIV (output_alignment))) % PRIV (output_alignment);
 764
 765 #if VMS_DEBUG
 766   vms_debug (6, "align: adding %d bytes\n", aligncount);
 767 #endif
 768
 769   while (aligncount-- > 0)
 770     {
 771       PRIV (output_buf)[real_size++] = 0;
 772 #if 0
 773       /* this is why I *love* vms: inconsistency :-}
 774          alignment is added to the subrecord length
 775          but not to the record length  */
 776       if (PRIV (push_level) > 0)
 777 #endif
 778         length++;
 779     }
 780
 781   /* put length to buffer  */
 782   PRIV (output_size) = PRIV (length_pos);
 783   _bfd_vms_output_short (abfd, (unsigned int)length);
 784
 785   if (PRIV (push_level) == 0)
 786     {
 787 #ifndef VMS
 788         /* write length first, see FF_FOREIGN in the input routines */
 789       fwrite (PRIV (output_buf)+2, 2, 1, (FILE *)abfd->iostream);
 790 #endif
 791       fwrite (PRIV (output_buf), real_size, 1, (FILE *)abfd->iostream);
 792
 793       PRIV (output_size) = 0;
 794     }
 795   else
 796     {
 797       PRIV (output_size) = real_size;
 798       PRIV (pushed_size) = PRIV (output_size);
 799     }
 800
 801   return;
 802 }
 803
 804 /* End record output  */
 805
 806 void
 807 _bfd_vms_output_end (abfd)
 808      bfd *abfd;
 809 {
 810 #if VMS_DEBUG
 811   vms_debug (6, "_bfd_vms_output_end\n");
 812 #endif
 813
 814   _bfd_vms_output_flush (abfd);
 815
 816   return;
 817 }
 818
 819 /* check remaining buffer size
 820
 821    return what's left.  */
 822
 823 int
 824 _bfd_vms_output_check (abfd, size)
 825     bfd *abfd;
 826     int size;
 827 {
 828 #if VMS_DEBUG
 829   vms_debug (6, "_bfd_vms_output_check(%d)\n", size);
 830 #endif
 831
 832   return (MAX_OUTREC_SIZE - (PRIV (output_size) + size + MIN_OUTREC_LUFT));
 833 }
 834
 835 /* Output byte (8 bit) value  */
 836
 837 void
 838 _bfd_vms_output_byte (abfd, value)
 839      bfd *abfd;
 840      unsigned int value;
 841 {
 842 #if VMS_DEBUG
 843   vms_debug (6, "_bfd_vms_output_byte(%02x)\n", value);
 844 #endif
 845
 846   bfd_put_8 (abfd, value & 0xff, PRIV (output_buf) + PRIV (output_size));
 847   PRIV (output_size) += 1;
 848   return;
 849 }
 850
 851 /* Output short (16 bit) value  */
 852
 853 void
 854 _bfd_vms_output_short (abfd, value)
 855      bfd *abfd;
 856      unsigned int value;
 857 {
 858 #if VMS_DEBUG
 859   vms_debug (6, "_bfd_vms_output_short (%04x)\n", value);
 860 #endif
 861
 862   bfd_put_16 (abfd, value & 0xffff, PRIV (output_buf) + PRIV (output_size));
 863   PRIV (output_size) += 2;
 864   return;
 865 }
 866
 867 /* Output long (32 bit) value  */
 868
 869 void
 870 _bfd_vms_output_long (abfd, value)
 871      bfd *abfd;
 872      unsigned long value;
 873 {
 874 #if VMS_DEBUG
 875   vms_debug (6, "_bfd_vms_output_long (%08lx)\n", value);
 876 #endif
 877
 878   bfd_put_32 (abfd, value, PRIV (output_buf) + PRIV (output_size));
 879   PRIV (output_size) += 4;
 880   return;
 881 }
 882
 883 /* Output quad (64 bit) value  */
 884
 885 void
 886 _bfd_vms_output_quad (abfd, value)
 887      bfd *abfd;
 888      uquad value;
 889 {
 890 #if VMS_DEBUG
 891   vms_debug (6, "_bfd_vms_output_quad(%016lx)\n", value);
 892 #endif
 893
 894   bfd_put_64(abfd, value, PRIV (output_buf) + PRIV (output_size));
 895   PRIV (output_size) += 8;
 896   return;
 897 }
 898
 899 /* Output c-string as counted string  */
 900
 901 void
 902 _bfd_vms_output_counted (abfd, value)
 903      bfd *abfd;
 904      char *value;
 905 {
 906 int len;
 907
 908 #if VMS_DEBUG
 909   vms_debug (6, "_bfd_vms_output_counted(%s)\n", value);
 910 #endif
 911
 912   len = strlen (value);
 913   if (len == 0)
 914     {
 915       (*_bfd_error_handler) (_("_bfd_vms_output_counted called with zero bytes"));
 916       return;
 917     }
 918   if (len > 255)
 919     {
 920       (*_bfd_error_handler) (_("_bfd_vms_output_counted called with too many bytes"));
 921       return;
 922     }
 923   _bfd_vms_output_byte (abfd, len & 0xff);
 924   _bfd_vms_output_dump (abfd, (unsigned char *)value, len);
 925 }
 926
 927 /* Output character area  */
 928
 929 void
 930 _bfd_vms_output_dump (abfd, data, length)
 931      bfd *abfd;
 932      unsigned char *data;
 933      int length;
 934 {
 935 #if VMS_DEBUG
 936   vms_debug (6, "_bfd_vms_output_dump(%d)\n", length);
 937 #endif
 938
 939   if (length == 0)
 940     return;
 941
 942   memcpy (PRIV (output_buf) + PRIV (output_size), data, length);
 943   PRIV (output_size) += length;
 944
 945   return;
 946 }
 947
 948 /* Output count bytes of value  */
 949
 950 void
 951 _bfd_vms_output_fill (abfd, value, count)
 952      bfd *abfd;
 953      int value;
 954      int count;
 955 {
 956 #if VMS_DEBUG
 957   vms_debug (6, "_bfd_vms_output_fill(val %02x times %d)\n", value, count);
 958 #endif
 959
 960   if (count == 0)
 961     return;
 962   memset (PRIV (output_buf) + PRIV (output_size), value, count);
 963   PRIV (output_size) += count;
 964
 965   return;
 966 }
 967
 968 /* this hash routine borrowed from GNU-EMACS, and strengthened slightly  ERY*/
 969
 970 static int
 971 hash_string (ptr)
 972      const char *ptr;
 973 {
 974   register const unsigned char *p = (unsigned char *) ptr;
 975   register const unsigned char *end = p + strlen (ptr);
 976   register unsigned char c;
 977   register int hash = 0;
 978
 979   while (p != end)
 980     {
 981       c = *p++;
 982       hash = ((hash << 3) + (hash << 15) + (hash >> 28) + c);
 983     }
 984   return hash;
 985 }
 986
 987 /* Generate a length-hashed VMS symbol name (limited to maxlen chars).  */
 988
 989 char *
 990 _bfd_vms_length_hash_symbol (abfd, in, maxlen)
 991      bfd *abfd;
 992      const char *in;
 993      int maxlen;
 994 {
 995   long int result;
 996   int in_len;
 997   char *new_name;
 998   const char *old_name;
 999   int i;
1000   static char outbuf[EOBJ_S_C_SYMSIZ+1];
1001   char *out = outbuf;
1002
1003 #if VMS_DEBUG
1004   vms_debug(4, "_bfd_vms_length_hash_symbol \"%s\"\n", in);
1005 #endif
1006
1007   if (maxlen > EOBJ_S_C_SYMSIZ)
1008     maxlen = EOBJ_S_C_SYMSIZ;
1009
1010   new_name = out;               /* save this for later.  */
1011
1012   /* We may need to truncate the symbol, save the hash for later.  */
1013
1014   in_len = strlen (in);
1015
1016   result = (in_len > maxlen) ? hash_string (in) : 0;
1017
1018   old_name = in;
1019
1020   /* Do the length checking.  */
1021
1022   if (in_len <= maxlen)
1023     {
1024       i = in_len;
1025     }
1026   else
1027     {
1028       if (PRIV (flag_hash_long_names))
1029         i = maxlen-9;
1030       else
1031         i = maxlen;
1032     }
1033
1034   strncpy (out, in, i);
1035   in += i;
1036   out += i;
1037
1038   if ((in_len > maxlen)
1039       && PRIV (flag_hash_long_names))
1040     sprintf (out, "_%08lx", result);
1041   else
1042     *out = 0;
1043
1044 #if VMS_DEBUG
1045   vms_debug(4, "--> [%d]\"%s\"\n", strlen (outbuf), outbuf);
1046 #endif
1047
1048   if (in_len > maxlen
1049         && PRIV (flag_hash_long_names)
1050         && PRIV (flag_show_after_trunc))
1051     printf (_("Symbol %s replaced by %s\n"), old_name, new_name);
1052
1053   return outbuf;
1054 }
1055
1056 /* Allocate and initialize a new symbol.  */
1057
1058 static asymbol *
1059 new_symbol (abfd, name)
1060      bfd *abfd;
1061      char *name;
1062 {
1063   asymbol *symbol;
1064
1065 #if VMS_DEBUG
1066   _bfd_vms_debug (7,  "new_symbol %s\n", name);
1067 #endif
1068
1069   symbol = _bfd_vms_make_empty_symbol (abfd);
1070   if (symbol == 0)
1071     return symbol;
1072   symbol->name = name;
1073   symbol->section = bfd_make_section (abfd, BFD_UND_SECTION_NAME);
1074
1075   return symbol;
1076 }
1077
1078 /* Allocate and enter a new private symbol.  */
1079
1080 vms_symbol_entry *
1081 _bfd_vms_enter_symbol (abfd, name)
1082      bfd *abfd;
1083      char *name;
1084 {
1085   vms_symbol_entry *entry;
1086
1087 #if VMS_DEBUG
1088   _bfd_vms_debug (6,  "_bfd_vms_enter_symbol %s\n", name);
1089 #endif
1090
1091   entry = (vms_symbol_entry *)
1092           bfd_hash_lookup (PRIV (vms_symbol_table), name, false, false);
1093   if (entry == 0)
1094     {
1095 #if VMS_DEBUG
1096       _bfd_vms_debug (8,  "creating hash entry for %s\n", name);
1097 #endif
1098       entry = (vms_symbol_entry *)bfd_hash_lookup (PRIV (vms_symbol_table), name, true, false);
1099       if (entry != 0)
1100         {
1101           asymbol *symbol;
1102           symbol = new_symbol (abfd, name);
1103           if (symbol != 0)
1104             {
1105               entry->symbol = symbol;
1106               PRIV (gsd_sym_count)++;
1107               abfd->symcount++;
1108             }
1109           else
1110             entry = 0;
1111         }
1112       else
1113         (*_bfd_error_handler) (_("failed to enter %s"), name);
1114     }
1115   else
1116     {
1117 #if VMS_DEBUG
1118       _bfd_vms_debug (8,  "found hash entry for %s\n", name);
1119 #endif
1120     }
1121
1122 #if VMS_DEBUG
1123   _bfd_vms_debug (7, "-> entry %p, entry->symbol %p\n", entry, entry->symbol);
1124 #endif
1125   return entry;
1126 }