+static inline wint_t
+# if @REPLACE_ISWCNTRL@
+rpl_towlower
+# else
+towlower
+# endif
+ (wint_t wc)
+{
+ return (wc >= 'A' && wc <= 'Z' ? wc - 'A' + 'a' : wc);
+}
+
+static inline wint_t
+# if @REPLACE_ISWCNTRL@
+rpl_towupper
+# else
+towupper
+# endif
+ (wint_t wc)
+{
+ return (wc >= 'a' && wc <= 'z' ? wc - 'a' + 'A' : wc);
+}
+
+#elif ! @HAVE_ISWBLANK@
+/* Only the iswblank function is missing. */
+
+static inline int
+iswblank (wint_t wc)
+{
+ return wc == ' ' || wc == '\t';
+}
+
+#endif
+
+#if defined __MINGW32__
+
+/* On native Windows, wchar_t is uint16_t, and wint_t is uint32_t.
+ The functions towlower and towupper are implemented in the MSVCRT library
+ to take a wchar_t argument and return a wchar_t result. mingw declares
+ these functions to take a wint_t argument and return a wint_t result.
+ This means that:
+ 1. When the user passes an argument outside the range 0x0000..0xFFFF, the
+ function will look only at the lower 16 bits. This is allowed according
+ to POSIX.
+ 2. The return value is returned in the lower 16 bits of the result register.
+ The upper 16 bits are random: whatever happened to be in that part of the
+ result register. We need to fix this by adding a zero-extend from
+ wchar_t to wint_t after the call. */
+
+static inline wint_t
+rpl_towlower (wint_t wc)
+{
+ return (wint_t) (wchar_t) towlower (wc);
+}
+# if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+# define towlower rpl_towlower
+# endif
+
+static inline wint_t
+rpl_towupper (wint_t wc)
+{
+ return (wint_t) (wchar_t) towupper (wc);
+}
+# if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+# define towupper rpl_towupper
+# endif
+
+#endif /* __MINGW32__ */
+
+#if @REPLACE_ISWCNTRL@
+_GL_CXXALIAS_RPL (iswalnum, int, (wint_t wc));
+_GL_CXXALIAS_RPL (iswalpha, int, (wint_t wc));
+_GL_CXXALIAS_RPL (iswblank, int, (wint_t wc));
+_GL_CXXALIAS_RPL (iswcntrl, int, (wint_t wc));
+_GL_CXXALIAS_RPL (iswdigit, int, (wint_t wc));
+_GL_CXXALIAS_RPL (iswgraph, int, (wint_t wc));
+_GL_CXXALIAS_RPL (iswlower, int, (wint_t wc));
+_GL_CXXALIAS_RPL (iswprint, int, (wint_t wc));
+_GL_CXXALIAS_RPL (iswpunct, int, (wint_t wc));
+_GL_CXXALIAS_RPL (iswspace, int, (wint_t wc));
+_GL_CXXALIAS_RPL (iswupper, int, (wint_t wc));
+_GL_CXXALIAS_RPL (iswxdigit, int, (wint_t wc));
+#else
+_GL_CXXALIAS_SYS (iswalnum, int, (wint_t wc));
+_GL_CXXALIAS_SYS (iswalpha, int, (wint_t wc));
+_GL_CXXALIAS_SYS (iswblank, int, (wint_t wc));
+_GL_CXXALIAS_SYS (iswcntrl, int, (wint_t wc));
+_GL_CXXALIAS_SYS (iswdigit, int, (wint_t wc));
+_GL_CXXALIAS_SYS (iswgraph, int, (wint_t wc));
+_GL_CXXALIAS_SYS (iswlower, int, (wint_t wc));
+_GL_CXXALIAS_SYS (iswprint, int, (wint_t wc));
+_GL_CXXALIAS_SYS (iswpunct, int, (wint_t wc));
+_GL_CXXALIAS_SYS (iswspace, int, (wint_t wc));
+_GL_CXXALIAS_SYS (iswupper, int, (wint_t wc));
+_GL_CXXALIAS_SYS (iswxdigit, int, (wint_t wc));
+#endif
+_GL_CXXALIASWARN (iswalnum);
+_GL_CXXALIASWARN (iswalpha);
+_GL_CXXALIASWARN (iswblank);
+_GL_CXXALIASWARN (iswcntrl);
+_GL_CXXALIASWARN (iswdigit);
+_GL_CXXALIASWARN (iswgraph);
+_GL_CXXALIASWARN (iswlower);
+_GL_CXXALIASWARN (iswprint);
+_GL_CXXALIASWARN (iswpunct);
+_GL_CXXALIASWARN (iswspace);
+_GL_CXXALIASWARN (iswupper);
+_GL_CXXALIASWARN (iswxdigit);
+
+#if @REPLACE_ISWCNTRL@ || defined __MINGW32__
+_GL_CXXALIAS_RPL (towlower, wint_t, (wint_t wc));
+_GL_CXXALIAS_RPL (towupper, wint_t, (wint_t wc));
+#else
+_GL_CXXALIAS_SYS (towlower, wint_t, (wint_t wc));
+_GL_CXXALIAS_SYS (towupper, wint_t, (wint_t wc));
+#endif
+_GL_CXXALIASWARN (towlower);
+_GL_CXXALIASWARN (towupper);
+