loader: add loader_get_extensions_name(..) helper

Changes since v1:
 - renamed function to loader_get_extensions_name
 - moved function into loader

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>

V2: [Emil Velikov]
 - Use local define.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>

src/loader/loader.c

@@ -396,3 +396,22 @@ loader_set_logger(void (*logger)(int level, const char *fmt, ...))
 {
    log_ = logger;
 }
+
+/* XXX: Local definition to avoid pulling the heavyweight GL/gl.h and
+ * GL/internal/dri_interface.h
+ */
+
+#ifndef __DRI_DRIVER_GET_EXTENSIONS
+#define __DRI_DRIVER_GET_EXTENSIONS "__driDriverGetExtensions"
+#endif
+
+char *
+loader_get_extensions_name(const char *driver_name)
+{
+   char *name = NULL;
+
+   if (asprintf(&name, "%s_%s", __DRI_DRIVER_GET_EXTENSIONS, driver_name) < 0)
+      return NULL;
+
+   return name;
+}

src/loader/loader.h

@@ -65,6 +65,8 @@ loader_get_user_preferred_fd(int default_fd, int *different_device);
 void
 loader_set_logger(void (*logger)(int level, const char *fmt, ...));
 
+char *
+loader_get_extensions_name(const char *driver_name);
 
 #ifdef __cplusplus
 }