/* i4info.c   (c)Copyright Sequiter Software Inc., 1990-1994.  All rights reserved. */

#include "d4all.h"
#ifndef S4UNIX
#ifdef __TURBOC__
#pragma hdrstop
#endif
#endif

#ifndef S4INDEX_OFF

char *S4FUNCTION t4alias( TAG4 *tag )
{
  return tag->alias ;
}

int S4FUNCTION t4is_descending( TAG4 *tag )
{
#ifdef S4NDX
  return 0 ;
#endif
#ifdef S4FOX
  if ( tag->header.descending )
    return r4descending ;
  else
    return 0 ;
#endif
#ifdef S4CLIPPER
  if ( tag->header.descending )
    return r4descending ;
  else
    return 0 ;
#endif
#ifdef S4MDX
  if ( tag->header.type_code & 8 )
    return r4descending ;
  else
    return 0 ;
#endif
}

int S4FUNCTION t4unique( TAG4 *tag )
{
#ifdef S4FOX
  if ( tag->header.type_code & 0x01 )
    return tag->unique_error ;
#else
  if ( tag->header.unique )
    return tag->unique_error ;
#endif
  return 0 ;
}

TAG4INFO *S4FUNCTION i4tag_info( INDEX4 *index )
{
  TAG4INFO *tag_info ;
  TAG4 *tag_on ;
  int num_tags, i ;

#ifdef S4DEBUG
  if ( index == 0 )
    e4severe( e4parm, E4_I4TAG_INFO ) ;
#endif

  if ( index->code_base->error_code < 0 )
    return 0 ;

  num_tags = 0 ;
  for( tag_on = 0 ;; )
  {
    tag_on = (TAG4 *)l4next( &index->tags, tag_on ) ;
    if ( tag_on == 0 )
      break ;
    num_tags++ ;
  }

  if ( index->code_base->error_code < 0 )
    return 0 ;
  tag_info = (TAG4INFO *)u4alloc_free( index->code_base, ( (long)num_tags + 1L ) * sizeof( TAG4INFO ) ) ;
  if ( tag_info == 0 )
    return 0 ;

  for( tag_on = 0, i = 0 ;; i++ )
  {
    tag_on = (TAG4 *)l4next( &index->tags, tag_on ) ;
    if ( tag_on == 0 )
      return ( tag_info ) ;
    tag_info[i].name = t4alias( tag_on ) ;
    tag_info[i].expression = expr4source( tag_on->expr ) ;
    tag_info[i].filter = expr4source( tag_on->filter ) ;
    tag_info[i].unique = t4unique( tag_on ) ;
    tag_info[i].descending = t4is_descending( tag_on ) ;
  }
}

#endif