abCalc/ops/abCOpSubtr.c

69 lines
1.4 KiB
C

/*
abCOpSubtr.c
By: Jeremy Rand
*/
#include <stdio.h>
#include "abCError.h"
#include "abCStack.h"
#include "expr/abCExpr.h"
#include "expr/abCExpReal.h"
#include "expr/abCExprInt.h"
#include "ops/abCOp.h"
#include "ops/abCOpSubtr.h"
#define SUB_NAME "-"
static void subtrExecute(void);
void abCalcOpSubtrInit(void)
{
abCalcOpRegister(SUB_NAME, subtrExecute);
}
void subtrExecute(void)
{
abCalcExpr result;
char expr1Real = 0;
char expr2Real = 0;
AB_CALC_OP_TWO_ARGS(SUB_NAME);
if (expr1->type == abCalcExprTypeReal) {
expr1Real = 1;
} else if (expr1->type != abCalcExprTypeInt) {
abCalcRaiseError(abCalcBadArgTypeError, SUB_NAME);
return;
}
if (expr2->type == abCalcExprTypeReal) {
expr2Real = 1;
} else if (expr2->type != abCalcExprTypeInt) {
abCalcRaiseError(abCalcBadArgTypeError, SUB_NAME);
return;
}
if ((expr1Real) && (expr2Real)) {
abCalcExprRealSet(&result, expr2->u.real - expr1->u.real);
} else {
if (expr1Real) {
abCalcExprIntSet(&result, expr2->u.integer - (abCalcIntType)expr1->u.real);
} else if (expr2Real) {
abCalcExprIntSet(&result, (abCalcIntType)expr2->u.real - expr1->u.integer);
} else {
abCalcExprIntSet(&result, expr2->u.integer - expr2->u.integer);
}
}
abCalcStackExprPop(NULL);
abCalcStackExprPop(NULL);
abCalcStackExprPush(&result);
}