io: add lots of directory and path manipulation functions

io/sys/darwin/posix.h

@@ -0,0 +1,13 @@
+#ifndef _IO_DARWIN_POSIX_H_
+#define _IO_DARWIN_POSIX_H_
+
+#include <blue/core/status.h>
+
+struct stat;
+struct b_file_info;
+
+extern enum b_status b_status_from_errno(int error, enum b_status default_value);
+extern enum b_status b_file_info_from_stat(
+	const struct stat *in, struct b_file_info *out);
+
+#endif