X-Git-Url: https://sigrok.org/gitweb/?p=libsigrokdecode.git;a=blobdiff_plain;f=type_logic.c;h=098e34d84d3af9d1471fa936ec17a0cec254efa2;hp=5e499f4a8c9ee4cfa4feb1f4e6c4c6abd062c39c;hb=b08272363131621c7571a02ac752e727e0ed54df;hpb=55c3c5f4b9d38b85fae2c39a8a6150b4c50b1bdb

diff --git a/type_logic.c b/type_logic.c
index 5e499f4..098e34d 100644
--- a/type_logic.c
+++ b/type_logic.c
@@ -33,7 +33,7 @@ static PyObject *srd_logic_iternext(PyObject *self)
 	PyObject *py_samplenum, *py_samples;
 	srd_logic *logic;
 	uint64_t sample;
-	unsigned char probe_samples[SRD_MAX_NUM_PROBES];
+	uint8_t probe_samples[SRD_MAX_NUM_PROBES + 1];
 
 	logic = (srd_logic *)self;
 	if (logic->itercnt >= logic->inbuflen / logic->di->data_unitsize) {
@@ -45,12 +45,26 @@ static PyObject *srd_logic_iternext(PyObject *self)
 	 * Convert the bit-packed sample to an array of bytes, with only 0x01
 	 * and 0x00 values, so the PD doesn't need to do any bitshifting.
 	 */
+
+	/* Get probe bits into the 'sample' variable. */
 	memcpy(&sample,
 	       logic->inbuf + logic->itercnt * logic->di->data_unitsize,
 	       logic->di->data_unitsize);
-	for (i = 0; i < logic->di->dec_num_probes; i++)
-		probe_samples[i] =
-		    sample & (1 << logic->di->dec_probemap[i]) ? 1 : 0;
+
+	/* All probe values (required + optional) are pre-set to 42. */
+	memset(probe_samples, 42, logic->di->dec_num_probes);
+	/* TODO: None or -1 in Python would be better. */
+
+	/*
+	 * Set probe values of specified/used probes to their resp. values.
+	 * Unused probe values (those not specified by the user) remain at 42.
+	 */
+	for (i = 0; i < logic->di->dec_num_probes; i++) {
+		/* A probemap value of -1 means "unused optional probe". */
+		if (logic->di->dec_probemap[i] == -1)
+			continue;
+		probe_samples[i] = sample & (1 << logic->di->dec_probemap[i]) ? 1 : 0;
+	}
 
 	/* Prepare the next samplenum/sample list in this iteration. */
 	py_samplenum =