[wpiutil] Add C API for DataLog (#5509)

ntcore/src/main/native/cpp/ntcore_c.cpp

@@ -588,6 +588,27 @@ void NT_SetNow(int64_t timestamp) {
   nt::SetNow(timestamp);
 }
 
+NT_DataLogger NT_StartEntryDataLog(NT_Inst inst, struct WPI_DataLog* log,
+                                   const char* prefix, const char* logPrefix) {
+  return nt::StartEntryDataLog(inst, *reinterpret_cast<wpi::log::DataLog*>(log),
+                               prefix, logPrefix);
+}
+
+void NT_StopEntryDataLog(NT_DataLogger logger) {
+  nt::StopEntryDataLog(logger);
+}
+
+NT_ConnectionDataLogger NT_StartConnectionDataLog(NT_Inst inst,
+                                                  struct WPI_DataLog* log,
+                                                  const char* name) {
+  return nt::StartConnectionDataLog(
+      inst, *reinterpret_cast<wpi::log::DataLog*>(log), name);
+}
+
+void NT_StopConnectionDataLog(NT_ConnectionDataLogger logger) {
+  nt::StopConnectionDataLog(logger);
+}
+
 NT_Listener NT_AddLogger(NT_Inst inst, unsigned int min_level,
                          unsigned int max_level, void* data,
                          NT_ListenerCallback func) {

ntcore/src/main/native/include/ntcore_c.h

@@ -16,6 +16,8 @@
 extern "C" {
 #endif
 
+struct WPI_DataLog;
+
 /**
  * @defgroup ntcore_c_api ntcore C API
  *
@@ -1347,6 +1349,54 @@ void NT_SetNow(int64_t timestamp);
 
 /** @} */
 
+/**
+ * @defgroup ntcore_data_logger_cfunc Data Logger Functions
+ * @{
+ */
+
+/**
+ * Starts logging entry changes to a DataLog.
+ *
+ * @param inst instance handle
+ * @param log data log object; lifetime must extend until StopEntryDataLog is
+ *            called or the instance is destroyed
+ * @param prefix only store entries with names that start with this prefix;
+ *               the prefix is not included in the data log entry name
+ * @param logPrefix prefix to add to data log entry names
+ * @return Data logger handle
+ */
+NT_DataLogger NT_StartEntryDataLog(NT_Inst inst, struct WPI_DataLog* log,
+                                   const char* prefix, const char* logPrefix);
+
+/**
+ * Stops logging entry changes to a DataLog.
+ *
+ * @param logger data logger handle
+ */
+void NT_StopEntryDataLog(NT_DataLogger logger);
+
+/**
+ * Starts logging connection changes to a DataLog.
+ *
+ * @param inst instance handle
+ * @param log data log object; lifetime must extend until StopConnectionDataLog
+ *            is called or the instance is destroyed
+ * @param name data log entry name
+ * @return Data logger handle
+ */
+NT_ConnectionDataLogger NT_StartConnectionDataLog(NT_Inst inst,
+                                                  struct WPI_DataLog* log,
+                                                  const char* name);
+
+/**
+ * Stops logging connection changes to a DataLog.
+ *
+ * @param logger data logger handle
+ */
+void NT_StopConnectionDataLog(NT_ConnectionDataLogger logger);
+
+/** @} */
+
 /**
  * @defgroup ntcore_logger_cfunc Logger Functions
  * @{