/**
 ******************************************************************************
 * @file      syscalls.c
 * @author    Auto-generated by STM32CubeIDE
 * @brief     STM32CubeIDE Minimal System 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 <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/times.h>
#include <time.h>

/* Variables */
// #undef errno
extern int errno;
extern int __io_putchar(int ch) __attribute__((weak));
extern int __io_getchar(void) __attribute__((weak));

register char * stack_ptr asm("sp");

char * __env[1] = { 0 };
char ** environ = __env;

/* Functions */
void initialise_monitor_handles() {}

int _getpid(void)
{
    return 1;
}

int _kill(int pid, int sig)
{
    errno = EINVAL;
    return -1;
}

void _exit(int status)
{
    _kill(status, -1);
    while (1)
    {
    } /* Make sure we hang here */
}

__attribute__((weak)) int _read(int file, char * ptr, int len)
{
    int DataIdx;

    for (DataIdx = 0; DataIdx < len; DataIdx++)
    {
        *ptr++ = __io_getchar();
    }

    return len;
}

__attribute__((weak)) int _write(int file, char * ptr, int len)
{
    int DataIdx;

    for (DataIdx = 0; DataIdx < len; DataIdx++)
    {
        __io_putchar(*ptr++);
    }
    return len;
}

int _close(int file)
{
    return -1;
}

int _fstat(int file, struct stat * st)
{
    st->st_mode = S_IFCHR;
    return 0;
}

int _isatty(int file)
{
    return 1;
}

int _lseek(int file, int ptr, int dir)
{
    return 0;
}

int _open(char * path, int flags, ...)
{
    /* Pretend like we always fail */
    return -1;
}

int _wait(int * status)
{
    errno = ECHILD;
    return -1;
}

int _unlink(char * name)
{
    errno = ENOENT;
    return -1;
}

int _times(struct tms * buf)
{
    return -1;
}

int _stat(char * file, struct stat * st)
{
    st->st_mode = S_IFCHR;
    return 0;
}

int _link(char * old, char * new)
{
    errno = EMLINK;
    return -1;
}

int _fork(void)
{
    errno = EAGAIN;
    return -1;
}

int _execve(char * name, char ** argv, char ** env)
{
    errno = ENOMEM;
    return -1;
}