/* lkrel.c - .rel object file handling

   Copyright (C) 1989-1995 Alan R. Baldwin
   721 Berkeley St., Kent, Ohio 44240
   Copyright (C) 2008-2010 Borut Razem, borut dot razem at siol dot net

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 3, 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, see <http://www.gnu.org/licenses/>. */

/*
 * With contributions for the
 * object libraries from
 * Ken Hornstein
 * kenh@cmf.nrl.navy.mil
 *
 */

/*
 * Extensions: P. Felber
 */

#include <assert.h>

#include "lk_readnl.h"
#include "aslink.h"
#include "lkrel.h"

int
is_rel (FILE * libfp)
{
  int c;
  long pos = ftell (libfp);
  int ret = 0;

  /* [XDQ][HL][234] */
  if (((c = getc (libfp)) == 'X' || c == 'D' || c == 'Q') && ((c = getc (libfp)) == 'H' || c == 'L'))
    {
      switch (getc (libfp))
        {
        case '2':
        case '3':
        case '4':
          switch (getc (libfp))
            {
            case '\r':
              if (getc (libfp) == '\n')
                ret = 1;
              break;

            case '\n':
              ret = 1;
            }
          break;

        case '\r':
          if (getc (libfp) == '\n')
            ret = 1;
          break;

        case '\n':
          ret = 1;
        }
    }
  else if (c == ';')
    {
      char buf[6];

      if (fread (buf, 1, sizeof (buf), libfp) == sizeof (buf) && memcmp (buf, "!FILE ", 6) == 0)
        ret = 1;
    }
  fseek (libfp, pos, SEEK_SET);
  return ret;
}

/* Load a standalone or embedded .rel */
int
load_rel (FILE * libfp, long size)
{
  if (is_rel (libfp))
    {
      char str[NINPUT];
      long end;

      end = (size >= 0) ? ftell (libfp) + size : -1;

      while ((end < 0 || ftell (libfp) < end) && lk_readnl (str, sizeof (str), libfp) != NULL)
        {
          if (0 == strcmp (str, "</REL>"))
            return 1;

          ip = str;
          link_main ();
        }

      return 1;
    }
  else
    return 0;
}

int
enum_symbols (FILE * fp, long size, int (*func) (const char *symvoid, void *param), void *param)
{
  char buf[NINPUT];
  long end = (size >= 0) ? ftell (fp) + size : -1;

  assert (func != NULL);

  /*
   * Read in the object file.  Look for lines that
   * begin with "S" and end with "D".  These are
   * symbol table definitions.  If we find one, see
   * if it is our symbol.  Make sure we only read in
   * our object file and don't go into the next one.
   */

  while ((end < 0 || ftell (fp) < end) && lk_readnl (buf, sizeof (buf), fp) != NULL)
    {
      char symname[NINPUT];
      char c;

      /*
       * When a 'T line' is found terminate file scan.
       * All 'S line's preceed 'T line's in .REL files.
       */
      if (buf[0] == 'T')
        break;

      /*
       * Skip everything that's not a symbol record.
       */
      if (buf[0] != 'S')
        continue;

      sscanf (buf, "S %s %c", symname, &c);

      /* If it's an actual symbol, record it */
      if (c == 'D')
        {
          if ((*func) (symname, param))
            return 1;
        }
    }

  return 0;
}