core: stream: add function to open a b_stream from a FILE pointer

core/include/blue/core/stream.h

@@ -4,6 +4,7 @@
 #include <blue/core/misc.h>
 #include <blue/core/status.h>
 #include <stdarg.h>
+#include <stdio.h>
 
 #define b_stdin  (z__b_stream_get_stdin())
 #define b_stdout (z__b_stream_get_stdout())
@@ -64,6 +65,8 @@ BLUE_API b_status b_stream_pipeline_init(
 	void *p, size_t len, b_stream_pipeline *out);
 BLUE_API b_status b_stream_pipeline_destroy(b_stream_pipeline *pipeline);
 
+BLUE_API b_stream *b_stream_open_fp(FILE *fp);
+
 BLUE_API b_status b_stream_close(b_stream *stream);
 BLUE_API b_status b_stream_reserve(b_stream *stream, size_t len);
 BLUE_API b_status b_stream_seek(