/*
* scif_rb_get_next - Read from ring buffer.
* @rb: ring buffer
* @msg: buffer to hold the message. Must be at least size bytes long
* @size: Number of bytes to be read
*
* Return: number of bytes read if available bytes are >= size, otherwise
* returns zero.
*/
u32 scif_rb_get_next(struct scif_rb *rb, void *msg, u32 size)
{
void *header = NULL;
int read_size = 0;
header = scif_rb_get(rb, size);
if (header) {
u32 next_cmd_offset =
(rb->current_read_offset + size) & (rb->size - 1);
read_size = size;
rb->current_read_offset = next_cmd_offset;
memcpy_fromrb(rb, header, msg, size);
}
return read_size;
}
/*
* micscif_rb_get_next
* Read from ring buffer.
* @rb - The RingBuffer context
* @msg - buffer to hold the message. Must be at least size bytes long
* @size - Size to be read out passed in, actual bytes read
* is returned.
* RETURN:
* Returns the number of bytes possible to read -- if retVal != size, then
* the read does not occur.
*/
int micscif_rb_get_next (struct micscif_rb *rb, void *msg, uint32_t size)
{
void *header = NULL;
int read_size = 0;
/*
* warning: RingBufferGet() looks at the shared write pointer
*/
header = micscif_rb_get(rb, size);
if (header) {
uint32_t next_cmd_offset =
(rb->current_read_offset + size) & (rb->size - 1);
read_size = size;
rb->old_current_read_offset = rb->current_read_offset;
rb->current_read_offset = next_cmd_offset;
if (memcpy_fromrb(rb, header, msg, size)) // add check here
return -EFAULT;
}
return read_size;
}
