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+#ifndef RUBY3_DOSISH_H /*-*-C++-*-vi:se ft=cpp:*/
+#define RUBY3_DOSISH_H
+/**
+ * @file
+ * @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.
+ * @warning Symbols prefixed with either `RUBY3` or `ruby3` are
+ * implementation details. Don't take them as canon. They could
+ * rapidly appear then vanish. The name (path) of this header file
+ * is also an implementation detail. Do not expect it to persist
+ * at the place it is now. Developers are free to move it anywhere
+ * anytime at will.
+ * @note To ruby-core: remember that this header can be possibly
+ * recursively included from extension libraries written in C++.
+ * Do not expect for instance `__VA_ARGS__` is always available.
+ * We assume C99 for ruby itself but we don't assume languages of
+ * extension libraries. They could be written in C++98.
+ * @brief Support for so-called dosish systems.
+ */
+#ifdef __CYGWIN__
+#undef _WIN32
+#endif
+
+#if defined(_WIN32)
+/*
+ DOSISH mean MS-Windows style filesystem.
+ But you should use more precise macros like DOSISH_DRIVE_LETTER, PATH_SEP,
+ ENV_IGNORECASE or CASEFOLD_FILESYSTEM.
+ */
+#define DOSISH 1
+# define DOSISH_DRIVE_LETTER
+#endif
+
+#ifdef _WIN32
+#include "ruby/win32.h"
+#endif
+
+#if defined(DOSISH)
+#define PATH_SEP ";"
+#else
+#define PATH_SEP ":"
+#endif
+
+#define PATH_SEP_CHAR PATH_SEP[0]
+
+#define PATH_ENV "PATH"
+
+#if defined(DOSISH)
+#define ENV_IGNORECASE
+#endif
+
+#ifndef CASEFOLD_FILESYSTEM
+# if defined DOSISH
+# define CASEFOLD_FILESYSTEM 1
+# else
+# define CASEFOLD_FILESYSTEM 0
+# endif
+#endif
+
+#endif /* RUBY3_DOSISH_H */