38 lines
615 B
C
38 lines
615 B
C
#include <yemu/stack.h>
|
|
#include <yemu/common.h>
|
|
#include <stddef.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
|
|
extern stack_t *stack;
|
|
extern unsigned int stack_size;
|
|
extern byte *sp;
|
|
|
|
int get_last_item_from_stack() {
|
|
if ((int)(*sp) <= 0) {
|
|
printf("Stack Underflow\n");
|
|
return -1;
|
|
}
|
|
return stack[(*sp)];
|
|
}
|
|
|
|
void push(int value) {
|
|
if (*sp >= stack_size-1) {
|
|
printf("Stack Overflow\n");
|
|
} else {
|
|
(*sp)++;
|
|
stack[*sp] = value;
|
|
}
|
|
}
|
|
|
|
int pop() {
|
|
int value = -1;
|
|
if ((int)(*sp) <= 0) {
|
|
printf("Stack Underflow\n");
|
|
} else {
|
|
value = stack[*sp];
|
|
(*sp)--;
|
|
}
|
|
return value;
|
|
}
|