80 lines
1.4 KiB
C
80 lines
1.4 KiB
C
#include <stdint.h>
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#ifdef DEBUG
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#include <stdio.h>
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#endif
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#include "mem.h"
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#define SIZE_MEM_BUFFER 1024
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static uint8_t mem_buffer[SIZE_MEM_BUFFER];
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static size_t mem_idx;
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#ifdef DEBUG
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size_t mem_max;
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#endif
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/**
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* Initializes the memory buffer index
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*/
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void mem_init(void)
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{
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mem_idx = 0;
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#ifdef DEBUG
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mem_max = 0;
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#endif
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}
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/**
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* Resets the memory buffer index
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*/
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void mem_reset(void)
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{
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mem_init();
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}
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/**
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* Allocates a chunk of the memory buffer of a given size.
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* Checks to see if there are enough space left in the memory buffer, returns
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* the current location in the memory buffer and moves the index accordingly.
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*
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* @param[in] size Requested allocation size in bytes
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* @return Allocated memory pointer; \ref NULL if not enough space left.
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*/
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void *mem_alloc(size_t size)
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{
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if ((mem_idx + size) > SIZE_MEM_BUFFER) // Buffer exceeded
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{
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#ifdef DEBUG
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printf("Memory exhausted!\n");
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#endif
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return NULL;
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}
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mem_idx += size;
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#ifdef DEBUG
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if (mem_idx > mem_max)
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{
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mem_max = mem_idx;
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}
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#endif
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return &mem_buffer[mem_idx - size];
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}
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/**
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* De-allocates a chunk of memory buffer by a given size.
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*
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* @param[in] size Requested deallocation size in bytes
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*/
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void mem_dealloc(size_t size)
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{
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if (size > mem_idx) // More than is already allocated
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{
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mem_idx = 0;
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}
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else
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{
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mem_idx -= size;
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}
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}
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