Add ncurses 6.4

third_party/ncurses/charable.c

@@ -0,0 +1,85 @@
+/****************************************************************************
+ * Copyright 2018,2020 Thomas E. Dickey                                     *
+ * Copyright 2003-2005,2008 Free Software Foundation, Inc.                  *
+ *                                                                          *
+ * Permission is hereby granted, free of charge, to any person obtaining a  *
+ * copy of this software and associated documentation files (the            *
+ * "Software"), to deal in the Software without restriction, including      *
+ * without limitation the rights to use, copy, modify, merge, publish,      *
+ * distribute, distribute with modifications, sublicense, and/or sell       *
+ * copies of the Software, and to permit persons to whom the Software is    *
+ * furnished to do so, subject to the following conditions:                 *
+ *                                                                          *
+ * The above copyright notice and this permission notice shall be included  *
+ * in all copies or substantial portions of the Software.                   *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
+ *                                                                          *
+ * Except as contained in this notice, the name(s) of the above copyright   *
+ * holders shall not be used in advertising or otherwise to promote the     *
+ * sale, use or other dealings in this Software without prior written       *
+ * authorization.                                                           *
+ ****************************************************************************/
+
+/*
+**	Support functions for wide/narrow conversion.
+*/
+
+#include "curses.priv.h"
+
+MODULE_ID("$Id: charable.c,v 1.8 2020/02/02 23:34:34 tom Exp $")
+
+NCURSES_EXPORT(bool) _nc_is_charable(wchar_t ch)
+{
+    bool result;
+#if HAVE_WCTOB
+    result = (wctob((wint_t) ch) == (int) ch);
+#else
+    result = (_nc_to_char(ch) >= 0);
+#endif
+    return result;
+}
+
+NCURSES_EXPORT(int) _nc_to_char(wint_t ch)
+{
+    int result;
+#if HAVE_WCTOB
+    result = wctob(ch);
+#elif HAVE_WCTOMB
+    char temp[MB_LEN_MAX];
+    result = wctomb(temp, ch);
+    if (strlen(temp) == 1)
+	result = UChar(temp[0]);
+    else
+	result = -1;
+#else
+#error expected either wctob/wctomb
+#endif
+    return result;
+}
+
+NCURSES_EXPORT(wint_t) _nc_to_widechar(int ch)
+{
+    wint_t result;
+#if HAVE_BTOWC
+    result = btowc(ch);
+#elif HAVE_MBTOWC
+    wchar_t convert;
+    char temp[2];
+    temp[0] = ch;
+    temp[1] = '\0';
+    if (mbtowc(&convert, temp, 1) >= 0)
+	result = convert;
+    else
+	result = WEOF;
+#else
+#error expected either btowc/mbtowc
+#endif
+    return result;
+}