ack/plat/rpi/libsys/write.c

/*
 * Raspberry Pi support library for the ACK
 * © 2013 David Given
 * This file is redistributable under the terms of the 3-clause BSD license.
 * See the file 'Copying' in the root of the distribution for the full text.
 */

#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <termios.h>
#include "libsys.h"

int _sys_ttyflags = ONLCR | INLCR | ECHO;

void _sys_write_tty(char c)
{
	_sys_rawwrite(c);
	if ((c == '\n') && (_sys_ttyflags & ONLCR))
		_sys_rawwrite('\r');
}

ssize_t write(int fd, void* buffer, size_t count)
{
	int i;
	char* p = buffer;
	
	/* We're only allowed to write to fd 0, 1 or 2. */
	
	if ((fd < 0) || (fd > 2))
	{
		errno = EBADF;
		return -1;
	}
	
	/* Write all data. */
	
	i = 0;
	while (i < count)
	{
		_sys_write_tty(*p++);
			
		i++;
	}
	
	/* No failures. */
	
	return count;
}