/**
 ******************************************************************************
 * @file      sysmem.c
 * @author    Auto-generated by STM32CubeIDE
 * @brief     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
 ******************************************************************************
 * @attention
 *
 * Copyright (c) 2020-2021 STMicroelectronics.
 * All rights reserved.
 *
 * This software is licensed under terms that can be found in the LICENSE file
 * in the root directory of this software component.
 * If no LICENSE file comes with this software, it is provided AS-IS.
 *
 ******************************************************************************
 */

/* Includes */
#include <errno.h>
#include <stdio.h>
#include <sys/errno.h>

/* Variables */
extern int errno;
register char * stack_ptr asm("sp");

/* Functions */

/**
 _sbrk
 Increase program data space. Malloc and related functions depend on this
**/
void * _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 (void *) -1;
    }

    heap_end += incr;

    return (void *) prev_heap_end;
}