# HG changeset patch
# User Jamie Bullock <jamie@jamiebullock.com>
# Date 1401996666 -3600
# Node ID d2453f55c47075baa37857ecb32367b277f91918
# Parent  66ebf1399a29c87292af1fd4b60f09cd359c6d71
Fix bug in xtract_last_n()

diff -r 66ebf1399a29 -r d2453f55c470 src/stateful.c
--- a/src/stateful.c	Thu Jun 05 20:30:08 2014 +0100
+++ b/src/stateful.c	Thu Jun 05 20:31:06 2014 +0100
@@ -50,7 +50,7 @@
     
     last_n_state->ringbuf = ringbuf_new(N * sizeof(double));
     
-    if (last_n_state->ringbuf)
+    if (last_n_state->ringbuf == NULL)
     {
         perror("could not allocate memory for xtract_last_n_state->ringbuf");
     }
@@ -66,7 +66,6 @@
 
 int xtract_last_n(const xtract_last_n_state *state, const double *data, const int N, const void *argv, double *result)
 {
-    double *current = (double *)argv;
     size_t N_bytes = N * sizeof(double);
     
     if (N_bytes != ringbuf_capacity(state->ringbuf))
@@ -75,7 +74,7 @@
         return XTRACT_BAD_STATE;
     }
     
-    ringbuf_memcpy_into(state->ringbuf, current, sizeof(double));
+    ringbuf_memcpy_into(state->ringbuf, data, sizeof(double));
     size_t used = ringbuf_bytes_used(state->ringbuf);
     ringbuf_memcpy_from(result, state->ringbuf, used, false);