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/* $Id: variable.c,v 1.3 2000/07/05 15:20:34 jholder Exp $
* --------------------------------------------------------------------
* see doc/License.txt for License Information
* --------------------------------------------------------------------
*
* File name: $Id: variable.c,v 1.3 2000/07/05 15:20:34 jholder Exp $
*
* Description:
*
* Modification history:
* $Log: variable.c,v $
* Revision 1.3 2000/07/05 15:20:34 jholder
* Updated code to remove warnings.
*
* Revision 1.2 2000/05/25 22:28:56 jholder
* changes routine names to reflect zmachine opcode names per spec 1.0
*
* Revision 1.1.1.1 2000/05/10 14:21:34 jholder
*
* imported
*
*
* --------------------------------------------------------------------
*/
/*
* variable.c
*
* Variable manipulation routines
*
*/
#include "ztypes.h"
/*
* z_load
*
* Load and store a variable value on stack.
*
*/
void z_load( zword_t variable )
{
store_operand( load_variable( variable ) );
} /* load */
/*
* z_push
*
* Push a value onto the stack
*
*/
void z_push( zword_t value )
{
stack[--sp] = value;
} /* push_var */
/*
* z_pull
*
* Pop a variable from the stack.
*
*/
void z_pull( zword_t variable )
{
z_store( variable, stack[sp++] );
} /* pop_var */
/*
* z_inc
*
* Increment a variable.
*
*/
void z_inc( zword_t variable )
{
z_store( variable, (zword_t)(load_variable( variable ) + 1) );
} /* increment */
/*
* z_dec
*
* Decrement a variable.
*
*/
void z_dec( zword_t variable )
{
z_store( variable, (zword_t)(load_variable( variable ) - 1) );
} /* decrement */
/*
* z_inc_chk
*
* Increment a variable and then check its value against a target.
*
*/
void z_inc_chk( zword_t variable, zword_t target )
{
ZINT16 value;
value = ( ZINT16 ) load_variable( variable );
z_store( variable, ++value );
conditional_jump( value > ( ZINT16 ) target );
} /* increment_check */
/*
* z_dec_chk
*
* Decrement a variable and then check its value against a target.
*
*/
void z_dec_chk( zword_t variable, zword_t target )
{
ZINT16 value;
value = ( ZINT16 ) load_variable( variable );
z_store( variable, --value );
conditional_jump( value < ( ZINT16 ) target );
} /* decrement_check */
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