93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
/*
|
|
* 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;
|
|
|
|
/* Heap boundaries from linker script. */
|
|
extern uint8_t _heap;
|
|
extern uint8_t _eheap;
|
|
|
|
static uint8_t *heap_end = &_heap;
|
|
uint8_t *prev_heap_end = heap_end;
|
|
|
|
if(heap_end + incr > &_eheap) {
|
|
PRINTF("Out of heap space!\n");
|
|
errno = ENOMEM;
|
|
return (caddr_t)-1;
|
|
}
|
|
|
|
heap_end += incr;
|
|
return (caddr_t)prev_heap_end;
|
|
}
|
|
|
|
/**
|
|
* @}
|
|
* @}
|
|
*/
|