Created
November 17, 2018 07:44
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Stack implementation header only in c
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#ifndef STACK_H | |
#define STACK_H | |
#include <stdlib.h> | |
#include <stddef.h> | |
#define DYNAMIC_ARRAY_INIT_CAPACITY 4 | |
#define DYNAMIC_ARRAY_GROWTH_FACTOR 2 | |
typedef struct Stack | |
{ | |
int size; | |
int elementSize; | |
int capacity; | |
void *data; | |
} Stack; | |
//Creates a stack | |
inline Stack *StackCreate(int elementSize) | |
{ | |
Stack *stack = malloc(sizeof(Stack)); | |
stack->size = 0; | |
stack->elementSize = elementSize; | |
stack->capacity = DYNAMIC_ARRAY_INIT_CAPACITY; | |
stack->data = malloc(elementSize * stack->capacity); | |
return stack; | |
} | |
//Get an element from stack of index | |
inline void *StackGet(Stack *stack, int index) | |
{ | |
if (index < stack->size) | |
return (char*)stack->data + (index * stack->elementSize); | |
else | |
return NULL; | |
} | |
//Push an element to a stack | |
inline void StackPush(Stack *stack, void *data) | |
{ | |
if (stack->size >= stack->capacity) | |
{ | |
//Allocate/set new data | |
stack->capacity *= DYNAMIC_ARRAY_GROWTH_FACTOR; | |
void *newLocation = malloc(stack->elementSize * stack->capacity); | |
memcpy(newLocation, stack->data, stack->elementSize * stack->size); | |
//Free old data | |
free(stack->data); | |
//Set new pointer | |
stack->data = newLocation; | |
} | |
//Add to size, and copy element data | |
stack->size++; | |
memcpy(StackGet(stack, stack->size - 1), data, stack->elementSize); | |
} | |
//Pop an element from a stack | |
inline void StackPop(Stack *stack) | |
{ | |
stack->size--; | |
} | |
//Free all memory of stack | |
inline void StackFree(Stack **stack) | |
{ | |
free((*stack)->data); | |
free(*stack); | |
*stack = NULL; | |
} | |
#endif //STACK_H |
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