Created Shiboken::warning function.

This is a help function to make able call python warning with formatted strings.

Reviewer: Marcelo Lira <marcelo.lira@openbossa.org>
          Luciano Wolf <luciano.wolf@openbossa.org>

2 files changed, 35 insertions, 0 deletions

diff --git a/libshiboken/helper.cpp b/libshiboken/helper.cpp
index 7359acf01..99b176447 100644
--- a/libshiboken/helper.cpp
+++ b/libshiboken/helper.cpp
@@ -21,6 +21,7 @@
  */
 
 #include "helper.h"
+#include <stdarg.h>
 
 namespace Shiboken
 {
@@ -97,4 +98,32 @@ int* sequenceToIntArray(PyObject* obj, bool zeroTerminated)
     return array;
 }
 
+
+int warning(PyObject *category, int stacklevel, const char *format, ...)
+{
+    va_list args;
+    va_start(args, format);
+#if _WIN32
+    va_list args2 = args;
+#else
+    va_list args2;
+    va_copy(args2, args);
+#endif
+
+    // check the necessary memmory
+    int result = vsnprintf(NULL, 0, format, args);
+    char *message = (char*) malloc(result);
+    if (message) {
+        // format the message
+        vsnprintf(message, result, format, args2);
+        result = PyErr_WarnEx(category, message, stacklevel);
+        free(message);
+    } else {
+        result = 0;
+    }
+    va_end(args2);
+    va_end(args);
+    return result;
+}
+
 } // namespace Shiboken
diff --git a/libshiboken/helper.h b/libshiboken/helper.h
index 52b41270f..b5e0b624e 100644
--- a/libshiboken/helper.h
+++ b/libshiboken/helper.h
@@ -92,6 +92,12 @@ LIBSHIBOKEN_API bool sequenceToArgcArgv(PyObject* argList, int* argc, char*** ar
  */
 LIBSHIBOKEN_API int* sequenceToIntArray(PyObject* obj, bool zeroTerminated = false);
 
+
+/**
+ * An utility function used to call PyErr_WarnEx with a formatted message.
+ */
+LIBSHIBOKEN_API int warning(PyObject *category, int stacklevel, const char *format, ...);
+
 } // namespace Shiboken
 
 #endif // HELPER_H