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/**
* @file heap.c
* @brief System level setup help
*/
/*******************************************************************************
* Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name of Maxim Integrated
* Products, Inc. shall not be used except as stated in the Maxim Integrated
* Products, Inc. Branding Policy.
*
* The mere transfer of this software does not imply any licenses
* of trade secrets, proprietary technology, copyrights, patents,
* trademarks, maskwork rights, or any other form of intellectual
* property whatsoever. Maxim Integrated Products, Inc. retains all
* ownership rights.
*
* $Date: 2018-12-18 15:37:22 -0600 (Tue, 18 Dec 2018) $
* $Revision: 40072 $
*
******************************************************************************/
/* **** Includes **** */
#include <stdint.h>
#include <errno.h>
#include <unistd.h>
/**
* @brief sbrk
* @detail Increase program data space
* @detail Malloc and related functions depend on this
*/
/* **** declarations **** */
static char *heap_end = 0;
extern unsigned int __HeapBase;
extern unsigned int __HeapLimit;
/* **** functions **** */
caddr_t _sbrk(int incr)
{
char *prev_heap_end;
if (heap_end == 0) {
heap_end = (caddr_t)&__HeapBase;
}
prev_heap_end = heap_end;
if ((unsigned int)(heap_end + incr) > (unsigned int)&__HeapLimit) {
errno = ENOMEM;
return (caddr_t) -1;
}
heap_end += incr;
return (caddr_t) prev_heap_end;
}
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