46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
#include <string.h>
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#ifndef __APPLE__
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#include <malloc.h>
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#else
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/* Linux + Kos define this, OSX does not, so just use malloc there */
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#define memalign(x, size) malloc((size))
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#endif
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#include "stack.h"
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void init_stack(Stack* stack, unsigned int element_size, unsigned int capacity) {
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stack->size = 0;
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stack->capacity = capacity;
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stack->element_size = element_size;
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stack->data = (unsigned char*) memalign(0x20, element_size * capacity);
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}
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void* stack_top(Stack* stack) {
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return &stack->data[(stack->size - 1) * stack->element_size];
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}
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void* stack_replace(Stack* stack, const void* element) {
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memcpy(stack->data + ((stack->size - 1) * stack->element_size), element, stack->element_size);
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return stack_top(stack);
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}
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void* stack_push(Stack* stack, const void* element) {
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if(stack->size + 1 == stack->capacity) {
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return NULL;
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}
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memcpy(stack->data + (stack->size * stack->element_size), element, stack->element_size);
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stack->size++;
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return stack_top(stack);
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}
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void stack_pop(Stack* stack) {
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if(stack->size == 0) {
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return;
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}
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stack->size--;
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}
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