41 lines
675 B
C
41 lines
675 B
C
#include "stack.h"
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#include "../lib/xalloc.h"
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#include <stdlib.h>
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struct stack {
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size_t max_size;
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size_t cur_size;
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void** arr;
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};
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stack_t* alloc_stack(size_t size)
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{
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stack_t* stack = xmalloc(sizeof(stack_t));
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stack->arr = xcalloc(size, sizeof(void*));
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stack->max_size = size;
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stack->cur_size = 0;
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return stack;
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}
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void free_stack(stack_t* stack)
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{
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xfree(stack->arr);
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xfree(stack);
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}
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void push(stack_t* stack, void* elt)
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{
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if (stack->cur_size == stack->max_size) {
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stack->max_size *= 2;
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xrealloc(stack->arr, stack->max_size);
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}
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stack->arr[stack->cur_size++] = elt;
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}
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void* pop(stack_t* stack)
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{
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void* res = stack->arr[--stack->cur_size];
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return res;
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}
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