From 208fc5191023efdd81f096175b4f5d281f7f40c2 Mon Sep 17 00:00:00 2001
From: Florian Pose <fp@igh.de>
Date: Mon, 31 Mar 2008 09:42:37 +0000
Subject: [PATCH] Introduced EC_MAP_END.

---
 examples/mini/mini.c  |  3 ++-
 include/ecrt.h        | 14 ++++++++++++++
 master/slave_config.c |  4 ++++
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/examples/mini/mini.c b/examples/mini/mini.c
index c6a2dc17..89dbdc57 100644
--- a/examples/mini/mini.c
+++ b/examples/mini/mini.c
@@ -96,6 +96,7 @@ static ec_pdo_entry_info_t el3162_channel2[] = {
 static ec_pdo_info_t el3162_mapping[] = {
     {EC_DIR_INPUT, 0x1A00, 2, el3162_channel1},
     {EC_DIR_INPUT, 0x1A01, 2, el3162_channel2},
+    {EC_MAP_END}
 };
 
 static ec_pdo_entry_info_t el2004_channels[] = {
@@ -279,7 +280,7 @@ int __init init_mini_module(void)
         goto out_release_master;
     }
 
-    if (ecrt_slave_config_mapping(sc, 2, el3162_mapping)) {
+    if (ecrt_slave_config_mapping(sc, EC_MAP_END, el3162_mapping)) {
         printk(KERN_ERR PFX "Failed to configure Pdo mapping.\n");
         goto out_release_master;
     }
diff --git a/include/ecrt.h b/include/ecrt.h
index 9ba6f2cc..907f0b46 100644
--- a/include/ecrt.h
+++ b/include/ecrt.h
@@ -120,6 +120,14 @@
  */
 #define ECRT_VERSION_MAGIC ECRT_VERSION(ECRT_VER_MAJOR, ECRT_VER_MINOR)
 
+/*****************************************************************************/
+
+/** End of mapping.
+ *
+ * This is used in ecrt_slave_config_mapping().
+ */
+#define EC_MAP_END ~0U
+
 /******************************************************************************
  * Data types 
  *****************************************************************************/
@@ -467,6 +475,12 @@ int ecrt_slave_config_pdo_entry(
  *     return -1; // error
  * \endcode
  *
+ * Processing of \a pdo_infos will stop, if
+ * - the number of processed items reaches \a n_infos, or
+ * - the \a dir member of an ec_pdo_info_t item is EC_MAP_END. In this case,
+ *   \a n_infos should set to a number greater than the number of list items;
+ *   using EC_MAP_END is recommended.
+ *
  * \return zero on success, else non-zero
  */
 int ecrt_slave_config_mapping(
diff --git a/master/slave_config.c b/master/slave_config.c
index b688346e..3a62b8c7 100644
--- a/master/slave_config.c
+++ b/master/slave_config.c
@@ -582,6 +582,10 @@ int ecrt_slave_config_mapping(ec_slave_config_t *sc, unsigned int n_infos,
 
     for (i = 0; i < n_infos; i++) {
         pi = &pdo_infos[i];
+
+        if (pi->dir == EC_MAP_END)
+            break;
+
         pm = &sc->mapping[pi->dir];
 
         if (pm->default_mapping) {