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/* | ||
* Copyright (c) 2014, Institute for Pervasive Computing, ETH Zurich. | ||
* All rights reserved. | ||
* | ||
* Author: Andreas Dröscher <contiki@anticat.ch> | ||
* | ||
* Redistribution and use in source and binary forms, with or without | ||
* modification, are permitted provided that the following conditions | ||
* are met: | ||
* 1. Redistributions of source code must retain the above copyright | ||
* notice, this list of conditions and the following disclaimer. | ||
* 2. Redistributions in binary form must reproduce the above copyright | ||
* notice, this list of conditions and the following disclaimer in the | ||
* documentation and/or other materials provided with the distribution. | ||
* 3. Neither the name of the Institute nor the names of its contributors | ||
* may be used to endorse or promote products derived from this software | ||
* without specific prior written permission. | ||
* | ||
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS "AS IS" AND | ||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE | ||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | ||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | ||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | ||
* SUCH DAMAGE. | ||
*/ | ||
/** | ||
* \addtogroup lib | ||
* @{ | ||
* | ||
* \defgroup newlib Generic Newlib customizations | ||
* | ||
* Library providing generic implementations of Newlib features for Contiki | ||
* @{ | ||
* | ||
* \file | ||
* System calls | ||
*/ | ||
#include <sys/types.h> | ||
#include <errno.h> | ||
#include <stdint.h> | ||
#include <stdio.h> | ||
/*---------------------------------------------------------------------------*/ | ||
#define DEBUG 0 | ||
#if DEBUG | ||
#define PRINTF(...) printf(__VA_ARGS__) | ||
#else | ||
#define PRINTF(...) | ||
#endif | ||
/*---------------------------------------------------------------------------*/ | ||
/** | ||
* \brief Enlarges the allocated heap space | ||
* \param incr Number of bytes by which to increase the heap space | ||
* \return The previous end of heap on success (which is also a pointer to the | ||
* start of the newly allocated memory if \p incr is positive), or | ||
* <tt>(caddr_t)-1</tt> with \c errno set to \c ENOMEM on error | ||
*/ | ||
caddr_t | ||
_sbrk(int incr) | ||
{ | ||
/* | ||
* Newlib's _sbrk_r() assumes that this global errno variable is used here, | ||
* which is different from the errno definition provided by <errno.h>. | ||
*/ | ||
#undef errno | ||
extern int errno; | ||
|
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/* Heap boundaries from linker script. */ | ||
extern uint8_t _heap; | ||
extern uint8_t _eheap; | ||
|
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static uint8_t *heap_end = &_heap; | ||
uint8_t *prev_heap_end = heap_end; | ||
|
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if(heap_end + incr > &_eheap) { | ||
PRINTF("Out of heap space!\n"); | ||
errno = ENOMEM; | ||
return (caddr_t)-1; | ||
} | ||
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heap_end += incr; | ||
return (caddr_t)prev_heap_end; | ||
} | ||
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/** | ||
* @} | ||
* @} | ||
*/ |