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/**
*****************************************************************************
**
** File : sysmem.c
**
** Author : Auto-generated by STM32CubeIDE
**
** Abstract : STM32CubeIDE Minimal System Memory calls file
**
** For more information about which c-functions
** need which of these lowlevel functions
** please consult the Newlib libc-manual
**
** Environment : STM32CubeIDE MCU
**
** Distribution: The file is distributed as is, without any warranty
** of any kind.
**
*****************************************************************************
**
** <h2><center>© COPYRIGHT(c) 2018 STMicroelectronics</center></h2>
**
** 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 STMicroelectronics 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
**
**
*****************************************************************************
*/
/* Includes */
#include <errno.h>
#include <stdio.h>
/* Variables */
extern int errno;
register char * stack_ptr asm("sp");
/* Functions */
/**
_sbrk
Increase program data space. Malloc and related functions depend on this
**/
caddr_t _sbrk(int incr)
{
extern char end asm("end");
static char *heap_end;
char *prev_heap_end;
if (heap_end == 0)
heap_end = &end;
prev_heap_end = heap_end;
if (heap_end + incr > stack_ptr)
{
errno = ENOMEM;
return (caddr_t) -1;
}
heap_end += incr;
return (caddr_t) prev_heap_end;
}
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