/**
* @brief Read from a file
*
* All input is read from UART_0. The function will block until a byte is actually read.
*
* Note: the read function does not buffer - data will be lost if the function is not
* called fast enough.
*
* TODO: implement more sophisticated read call.
*
* @param r TODO
* @param fd TODO
* @param buffer TODO
* @param int TODO
*
* @return TODO
*/
int _read_r(struct _reent *r, int fd, void *buffer, unsigned int count)
{
#ifndef MODULE_UART0
while (rx_buf.avail == 0) {
mutex_lock(&uart_rx_mutex);
}
return ringbuffer_get(&rx_buf, (char*)buffer, rx_buf.avail);
#else
char *res = (char*)buffer;
res[0] = (char)uart0_readc();
return 1;
#endif
}
int readpacket(uint8_t *packet_buf, size_t size)
{
uint8_t *line_buf_ptr = packet_buf;
uint8_t byte = END + 1;
uint8_t esc = 0;
while (1) {
byte = uart0_readc();
if (byte == END) {
break;
}
if ((size_t)(line_buf_ptr - packet_buf) >= size - 1) {
return -SIXLOWERROR_ARRAYFULL;
}
if (esc) {
esc = 0;
switch (byte) {
case (END_ESC): {
*line_buf_ptr++ = END;
continue;
}
case (ESC_ESC): {
*line_buf_ptr++ = ESC;
continue;
}
default:
continue;
}
}
if (byte == ESC) {
esc = 1;
continue;
}
*line_buf_ptr++ = byte;
}
return (line_buf_ptr - packet_buf - 1);
}
/**
* @brief Read from a file
*
* All input is read from UART_0. The function will block until a byte is actually read.
*
* Note: the read function does not buffer - data will be lost if the function is not
* called fast enough.
*
* TODO: implement more sophisticated read call.
*
* @param r TODO
* @param fd TODO
* @param buffer TODO
* @param int TODO
*
* @return TODO
*/
int _read_r(struct _reent *r, int fd, void *buffer, unsigned int count)
{
if (fd != STDIN_FILENO) {
r->_errno = EBADF;
return -1;
}
r->_errno = 0;
if (count == 0) {
return 0;
}
#ifndef MODULE_UART0
while (rx_buf.avail == 0) {
mutex_lock(&uart_rx_mutex);
}
return ringbuffer_get(&rx_buf, (char*)buffer, rx_buf.avail);
#else
char *res = (char*)buffer;
res[0] = (char)uart0_readc();
return 1;
#endif
}
