79 lines
1.5 KiB
C
79 lines
1.5 KiB
C
#include "vstack.h"
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#include <stdlib.h>
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#include <assert.h>
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//#define DEBUG
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#include "debug.h"
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struct __vstack_t
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{
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cmph_uint32 pointer;
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cmph_uint32 *values;
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cmph_uint32 capacity;
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};
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vstack_t *vstack_new(void)
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{
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vstack_t *stack = (vstack_t *)malloc(sizeof(vstack_t));
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assert(stack);
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stack->pointer = 0;
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stack->values = NULL;
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stack->capacity = 0;
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return stack;
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}
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void vstack_destroy(vstack_t *stack)
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{
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assert(stack);
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free(stack->values);
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free(stack);
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}
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void vstack_push(vstack_t *stack, cmph_uint32 val)
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{
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assert(stack);
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vstack_reserve(stack, stack->pointer + 1);
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stack->values[stack->pointer] = val;
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++(stack->pointer);
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}
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void vstack_pop(vstack_t *stack)
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{
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assert(stack);
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assert(stack->pointer > 0);
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--(stack->pointer);
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}
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cmph_uint32 vstack_top(vstack_t *stack)
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{
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assert(stack);
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assert(stack->pointer > 0);
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return stack->values[(stack->pointer - 1)];
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}
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int vstack_empty(vstack_t *stack)
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{
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assert(stack);
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return stack->pointer == 0;
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}
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cmph_uint32 vstack_size(vstack_t *stack)
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{
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return stack->pointer;
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}
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void vstack_reserve(vstack_t *stack, cmph_uint32 size)
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{
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assert(stack);
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if (stack->capacity < size)
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{
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cmph_uint32 new_capacity = stack->capacity + 1;
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DEBUGP("Increasing current capacity %u to %u\n", stack->capacity, size);
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while (new_capacity < size)
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{
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new_capacity *= 2;
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}
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stack->values = (cmph_uint32 *)realloc(stack->values, sizeof(cmph_uint32)*new_capacity);
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assert(stack->values);
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stack->capacity = new_capacity;
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DEBUGP("Increased\n");
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}
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}
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