C API cleanup, feature additions

* Cleaned up usage of handles vs. handle pointers
* Store global string for last error thrown
* Removed uhd::device_addr_t handle, added std::vector<std::string> handle

1 files changed, 36 insertions, 0 deletions

diff --git a/host/lib/error_c.cpp b/host/lib/error_c.cpp
index c3a83eec9..3ce63a81d 100644
--- a/host/lib/error_c.cpp
+++ b/host/lib/error_c.cpp
@@ -17,6 +17,11 @@
 
 #include <uhd/error.h>
 #include <uhd/exception.hpp>
+#include <uhd/utils/static.hpp>
+
+#include <boost/thread/mutex.hpp>
+
+#include <cstring>
 
 #define MAP_TO_ERROR(exception_type, error_type) \
     if (dynamic_cast<const uhd::exception_type*>(e)) return error_type;
@@ -38,3 +43,34 @@ uhd_error error_from_uhd_exception(const uhd::exception* e){
 
     return UHD_ERROR_EXCEPT;
 }
+
+// Store the error string in a single place in library
+UHD_SINGLETON_FCN(std::string, _c_global_error_string)
+
+static boost::mutex _error_c_mutex;
+
+const std::string& get_c_global_error_string(){
+    boost::mutex::scoped_lock lock(_error_c_mutex);
+    return _c_global_error_string();
+}
+
+void set_c_global_error_string(
+    const std::string &msg
+){
+    boost::mutex::scoped_lock lock(_error_c_mutex);
+    _c_global_error_string() = msg;
+}
+
+uhd_error uhd_get_last_error(
+    char* error_out,
+    size_t strbuffer_len
+){
+    try{
+        memset(error_out, '\0', strbuffer_len);
+        strncpy(error_out, _c_global_error_string().c_str(), strbuffer_len);
+    }
+    catch(...){
+        return UHD_ERROR_UNKNOWN;
+    }
+    return UHD_ERROR_NONE;
+}