transform: Add a "nop" transform module.

This doesn't do anything, just passes input packets on unmodified.

diff --git a/Makefile.am b/Makefile.am
index 00536456d7c656ee12ff42e7207214b3027d365c..e5012f3690bed2513168dfe943be28ab2289f893 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -70,7 +70,8 @@ libsigrok_la_SOURCES += \
 
 # Transform modules
 libsigrok_la_SOURCES += \
-       src/transform/transform.c
+       src/transform/transform.c \
+       src/transform/nop.c
 
 # SCPI support
 libsigrok_la_SOURCES += \

diff --git a/src/transform/nop.c b/src/transform/nop.c
new file mode 100644 (file)
index 0000000..8de2f2d
--- /dev/null
+++ b/src/transform/nop.c
@@ -0,0 +1,49 @@
+/*
+ * This file is part of the libsigrok project.
+ *
+ * Copyright (C) 2015 Uwe Hermann <uwe@hermann-uwe.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include <string.h>
+#include "libsigrok.h"
+#include "libsigrok-internal.h"
+
+#define LOG_PREFIX "transform/nop"
+
+static int receive(const struct sr_transform *t,
+               struct sr_datafeed_packet *packet_in,
+               struct sr_datafeed_packet **packet_out)
+{
+       if (!t || !t->sdi || !packet_in || !packet_out)
+               return SR_ERR_ARG;
+
+       /* Do nothing, just pass on packets unmodified. */
+       sr_spew("Received packet of type %d, passing on unmodified.", packet_in->type);
+       *packet_out = packet_in;
+
+       return SR_OK;
+}
+
+SR_PRIV struct sr_transform_module transform_nop = {
+       .id = "nop",
+       .name = "NOP",
+       .desc = "Do nothing",
+       .options = NULL,
+       .init = NULL,
+       .receive = receive,
+       .cleanup = NULL,
+};

diff --git a/src/transform/transform.c b/src/transform/transform.c
index 0c569a6f9d6af52ee84018592111f9742ab054c4..7477dc45e6f1f9407beb8751400ad52cc5fdf64b 100644 (file)
--- a/src/transform/transform.c
+++ b/src/transform/transform.c
@@ -39,9 +39,11 @@
  */
 
 /** @cond PRIVATE */
+extern SR_PRIV struct sr_transform_module transform_nop;
 /* @endcond */
 
 static const struct sr_transform_module *transform_module_list[] = {
+       &transform_nop,
        NULL,
 };