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/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#ifndef __LWIP_MEM_H__
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#define __LWIP_MEM_H__
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#include "lwip/opt.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if MEM_LIBC_MALLOC
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#include <stddef.h> /* for size_t */
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typedef size_t mem_size_t;
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/* aliases for C library malloc() */
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#define mem_init()
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/* in case C library malloc() needs extra protection,
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* allow these defines to be overridden.
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*/
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#ifndef mem_free
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#define mem_free free
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#endif
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#ifndef mem_malloc
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#define mem_malloc malloc
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#endif
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#ifndef mem_calloc
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#define mem_calloc calloc
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#endif
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/* Since there is no C library allocation function to shrink memory without
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moving it, define this to nothing. */
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#ifndef mem_trim
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#define mem_trim(mem, size) (mem)
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#endif
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#else /* MEM_LIBC_MALLOC */
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/* MEM_SIZE would have to be aligned, but using 64000 here instead of
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* 65535 leaves some room for alignment...
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*/
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#if MEM_SIZE > 64000l
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typedef u32_t mem_size_t;
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#define MEM_SIZE_F U32_F
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#else
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typedef u16_t mem_size_t;
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#define MEM_SIZE_F U16_F
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#endif /* MEM_SIZE > 64000 */
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#if MEM_USE_POOLS
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/** mem_init is not used when using pools instead of a heap */
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#define mem_init()
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/** mem_trim is not used when using pools instead of a heap:
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we can't free part of a pool element and don't want to copy the rest */
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#define mem_trim(mem, size) (mem)
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#else /* MEM_USE_POOLS */
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/* lwIP alternative malloc */
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void mem_init(void);
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void *mem_trim(void *mem, mem_size_t size);
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#endif /* MEM_USE_POOLS */
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void *mem_malloc(mem_size_t size);
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void *mem_calloc(mem_size_t count, mem_size_t size);
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void mem_free(void *mem);
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#endif /* MEM_LIBC_MALLOC */
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/** Calculate memory size for an aligned buffer - returns the next highest
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* multiple of MEM_ALIGNMENT (e.g. LWIP_MEM_ALIGN_SIZE(3) and
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* LWIP_MEM_ALIGN_SIZE(4) will both yield 4 for MEM_ALIGNMENT == 4).
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*/
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#ifndef LWIP_MEM_ALIGN_SIZE
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#define LWIP_MEM_ALIGN_SIZE(size) (((size) + MEM_ALIGNMENT - 1) & ~(MEM_ALIGNMENT-1))
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#endif
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/** Calculate safe memory size for an aligned buffer when using an unaligned
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* type as storage. This includes a safety-margin on (MEM_ALIGNMENT - 1) at the
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* start (e.g. if buffer is u8_t[] and actual data will be u32_t*)
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*/
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#ifndef LWIP_MEM_ALIGN_BUFFER
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#define LWIP_MEM_ALIGN_BUFFER(size) (((size) + MEM_ALIGNMENT - 1))
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#endif
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/** Align a memory pointer to the alignment defined by MEM_ALIGNMENT
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* so that ADDR % MEM_ALIGNMENT == 0
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*/
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#ifndef LWIP_MEM_ALIGN
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#define LWIP_MEM_ALIGN(addr) ((void *)(((mem_ptr_t)(addr) + MEM_ALIGNMENT - 1) & ~(mem_ptr_t)(MEM_ALIGNMENT-1)))
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* __LWIP_MEM_H__ */
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Daniel Peter