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