[pforth] / csrc / pf_cglue.c

/* @(#) pf_cglue.c 98/02/11 1.4 */
/***************************************************************
** 'C' Glue support for Forth based on 'C'
**
** Author: Phil Burk
** Copyright 1994 3DO, Phil Burk, Larry Polansky, David Rosenboom
**
** The pForth software code is dedicated to the public domain,
** and any third party may reproduce, distribute and modify
** the pForth software code or any derivative works thereof
** without any compensation or license.  The pForth software
** code is provided on an "as is" basis without any warranty
** of any kind, including, without limitation, the implied
** warranties of merchantability and fitness for a particular
** purpose and their equivalents under the laws of any jurisdiction.
**
***************************************************************/

#include "pf_all.h"

extern CFunc0 CustomFunctionTable[];

/***************************************************************/
cell_t CallUserFunction( cell_t Index, int32_t ReturnMode, int32_t NumParams )
{
   cell_t P1, P2, P3, P4, P5;
   cell_t Result = 0;
   CFunc0 CF;

DBUG(("CallUserFunction: Index = %d, ReturnMode = %d, NumParams = %d\n",
   Index, ReturnMode, NumParams ));

   CF = CustomFunctionTable[Index];

   switch( NumParams )
   {
   case 0:
       Result = ((CFunc0) CF) ( );
       break;
   case 1:
       P1 = POP_DATA_STACK;
       Result = ((CFunc1) CF) ( P1 );
       break;
   case 2:
       P2 = POP_DATA_STACK;
       P1 = POP_DATA_STACK;
       Result = ((CFunc2) CF) ( P1, P2 );
       break;
   case 3:
       P3 = POP_DATA_STACK;
       P2 = POP_DATA_STACK;
       P1 = POP_DATA_STACK;
       Result = ((CFunc3) CF) ( P1, P2, P3 );
       break;
   case 4:
       P4 = POP_DATA_STACK;
       P3 = POP_DATA_STACK;
       P2 = POP_DATA_STACK;
       P1 = POP_DATA_STACK;
       Result = ((CFunc4) CF) ( P1, P2, P3, P4 );
       break;
   case 5:
       P5 = POP_DATA_STACK;
       P4 = POP_DATA_STACK;
       P3 = POP_DATA_STACK;
       P2 = POP_DATA_STACK;
       P1 = POP_DATA_STACK;
       Result = ((CFunc5) CF) ( P1, P2, P3, P4, P5 );
       break;
   default:
       pfReportError("CallUserFunction", PF_ERR_NUM_PARAMS);
       EXIT(1);
   }

/* Push result on Forth stack if requested. */
   if(ReturnMode == C_RETURNS_VALUE) PUSH_DATA_STACK( Result );

   return Result;
}

#if (!defined(PF_NO_INIT)) && (!defined(PF_NO_SHELL))
/***************************************************************/
Err CreateGlueToC( const char *CName, ucell_t Index, cell_t ReturnMode, int32_t NumParams )
{
   ucell_t Packed;
   char FName[40];

   CStringToForth( FName, CName, sizeof(FName) );
   Packed = (Index & 0xFFFF) | 0 | (NumParams << 24) |
       (ReturnMode << 31);
   DBUG(("Packed = 0x%8x\n", Packed));

   ffCreateSecondaryHeader( FName );
   CODE_COMMA( ID_CALL_C );
   CODE_COMMA(Packed);
   ffFinishSecondary();

   return 0;
}
#endif