view Common/Drivers/Src/syscalls.c @ 538:b1eee27cd02b

BugFix firmware downgrade to version with less settings: If a downgrade to a firmware version using less setting parameter were done then the settings had been reset to the default values. Root cause was that only increased number of settings was accepted by the read function. Because the layout of the setting structure is fixed (only bytes attached, no change in the order of data values) a downgrade just discarding the no longer used settings is possible => Updated read function to handle reduction of setting parameters.
author Ideenmodellierer
date Sat, 10 Oct 2020 13:51:44 +0200
parents 5f11787b4f42
children
line wrap: on
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/**
*****************************************************************************
**
**  File        : syscalls.c
**
**  Abstract    : System Workbench Minimal System calls file
**
** 		          For more information about which c-functions
**                need which of these lowlevel functions
**                please consult the Newlib libc-manual
**
**  Environment : System Workbench for MCU
**
**  Distribution: The file is distributed “as is,” without any warranty
**                of any kind.
**
*****************************************************************************
**
** <h2><center>&copy; COPYRIGHT(c) 2014 Ac6</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 Ac6 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 <sys/stat.h>
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <signal.h>
#include <time.h>
#include <sys/time.h>
#include <sys/times.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 */
}

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

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

return len;
}

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

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

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)
	{
//		write(1, "Heap and stack collision\n", 25);
//		abort();
		errno = ENOMEM;
		return (caddr_t) -1;
	}

	heap_end += incr;

	return (caddr_t) prev_heap_end;
}

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;
}