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+#ifndef INTERNAL_UTIL_H /*-*-C-*-vi:se ft=c:*/
+#define INTERNAL_UTIL_H
+/**
+ * @author Ruby developers <ruby-core@ruby-lang.org>
+ * @copyright This file is a part of the programming language Ruby.
+ * Permission is hereby granted, to either redistribute and/or
+ * modify this file, provided that the conditions mentioned in the
+ * file COPYING are met. Consult the file for details.
+ * @brief Internal header corresponding util.c.
+ * @warning DO NOT ADD RANDOM GARBAGE HERE THIS FILE IS FOR util.c
+ */
+#include "ruby/internal/config.h"
+#include <stddef.h> /* for size_t */
+
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h> /* for ssize_t (note: on Windows ssize_t is */
+#endif /* `#define`d in ruby/config.h) */
+
+/* util.c */
+char *ruby_dtoa(double d_, int mode, int ndigits, int *decpt, int *sign, char **rve);
+char *ruby_hdtoa(double d, const char *xdigs, int ndigits, int *decpt, int *sign, char **rve);
+
+RUBY_SYMBOL_EXPORT_BEGIN
+/* util.c (export) */
+RUBY_SYMBOL_EXPORT_END
+
+#endif /* INTERNAL_UTIL_H */