/**
* Write bytes from file into ring buffer
*
* @param rb the ring buffer
* @param fd file descriptor
* @param n max bytes to write
* @return bytes written into the ring buffer, or -1 if error
*/
ssize_t rb_write_from_file(CwtRingBuffer* rb, int fd, size_t n)
{
BYTE ibuf[256];
size_t total_br = 0;
CwtUnistdNS *ns = cwt_unistd_ns();
if( fd < 0 ) {
print_error(_Tr("invalid file descriptor"));
return 0;
}
while( total_br < n ) {
/* TODO fix unsigned int cast */
ssize_t br = ns->read(fd, ibuf, (UINT)(n - total_br));
if( br == 0 ) /* end of file */
break;
if( br < 0 ) {
printf_error(_Tr("read file error: %s"), strerror(errno));
return (ssize_t)-1;
}
total_br += br;
if( !rb_push_back(rb, ibuf, br) ) {
return (ssize_t)-1;
}
}
return (ssize_t)total_br;
}
bool sp_read(struct ring_buf_data* p_pd)
{
for(;;)
{
uint8_t val = 0;
const ssize_t bytesRead = read(s_fd, &val, 1);
if(bytesRead < 0)
{
// error
log_err("serial read error");
return(false);
}
if(0 == bytesRead)
{
// no data available
break;
}
rb_push_back(p_pd, val);
if(S_OK == mb_validate(p_pd))
{
// have a message
return(true);
}
}
return(false);
}
static ssize_t rb_write(CwtRingBuffer *rb, const BYTE* bytes, size_t n)
{
CWT_ASSERT(rb);
if( !n )
return (ssize_t)0;
if( !rb_push_back(rb, bytes, (size_t)n) ) {
return (ssize_t)-1;
}
return (ssize_t)n;
}
