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