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/*
* Copyright (C) 2014 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup oneway_malloc Oneway malloc
* @ingroup sys
*
* @brief A malloc implementation without free for boards where the
* toolchain does not implement dynamic memory allocation.
*
* The toolchain of MSP-430, for example, does not contain
* malloc() and friends. These functions provide the same
* interface as the stdlib functions, but the option to free
* memory.
*
* @note You should prefer statically allocated memory whenever possible.
*
* @{
* @file
*
* @author Kaspar Schleiser <kaspar@schleiser.de>
* @author René Kijewski <rene.kijewski@fu-berlin.de>
*/
#ifndef MALLOC_H
#define MALLOC_H
#include <stdlib.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Allocation a block of memory.
* @param[in] size Size of the block to allocate in bytes.
* @returns The new memory block. `NULL` if the "heap" is exhausted.
*/
void *malloc(size_t size);
/**
* @brief Allocated a new block of memory and move the existing content.
* @details This function allocates a new block of memory and memcpy()s the content of the ond `ptr` there.
*
* We do not know the size of the old block, so illegal reads would be likely,
* if it was not for the fact that the memory heap up.
* @param[in] ptr Old memory block that was allocated with malloc(), calloc() or realloc().
* @param[in] size Size of the new block to allocted in bytes.
* @returns The new memory block. `NULL` if the "heap" is exhausted.
*/
void *realloc(void *ptr, size_t size);
/**
* @brief Allocate a memory block and set all its content to zeroes.
* @details Please see malloc() for more information.
* @note This implementation of calloc() does not catch integer overflows
* @param[in] size One factor of the number of bytes to allocated.
* @param[in] cnt The other factor of the number of bytes to allocated.
* @returns The new memory block. `NULL` if the "heap" is exhausted.
*/
void *calloc(size_t size, size_t cnt);
/**
* @brief This is a no-op.
* @details You read correctly: This function does noting.
* @note Keep in mind that this function does not free the memory. It does nothing.
* @param[in] ptr The ignored argument.
*/
void free(void *ptr);
#ifdef __cplusplus
}
#endif
#endif /* MALLOC_H */
/**
* @}
*/
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