Add ncurses 6.4

third_party/ncurses/lib_get_wch.c

@@ -0,0 +1,121 @@
+/****************************************************************************
+ * Copyright 2020,2021 Thomas E. Dickey                                     *
+ * Copyright 2002-2011,2016 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.                                                           *
+ ****************************************************************************/
+
+/****************************************************************************
+ *  Author: Thomas E. Dickey 2002-on                                        *
+ ****************************************************************************/
+
+/*
+**	lib_get_wch.c
+**
+**	The routine get_wch().
+**
+*/
+
+#include "curses.priv.h"
+#include <ctype.h>
+
+MODULE_ID("$Id: lib_get_wch.c,v 1.26 2021/04/17 16:12:54 tom Exp $")
+
+NCURSES_EXPORT(int)
+wget_wch(WINDOW *win, wint_t *result)
+{
+    SCREEN *sp;
+    int code;
+    int value = 0;
+#ifndef state_unused
+    mbstate_t state;
+#endif
+
+    T((T_CALLED("wget_wch(%p)"), (void *) win));
+
+    /*
+     * We can get a stream of single-byte characters and KEY_xxx codes from
+     * _nc_wgetch(), while we want to return a wide character or KEY_xxx code.
+     */
+    _nc_lock_global(curses);
+    sp = _nc_screen_of(win);
+
+    if (sp != 0) {
+	size_t count = 0;
+
+	for (;;) {
+	    char buffer[(MB_LEN_MAX * 9) + 1];	/* allow some redundant shifts */
+
+	    T(("reading %d of %d", (int) count + 1, (int) sizeof(buffer)));
+	    code = _nc_wgetch(win, &value, TRUE EVENTLIST_2nd((_nc_eventlist
+							       *) 0));
+	    if (code == ERR) {
+		break;
+	    } else if (code == KEY_CODE_YES) {
+		/*
+		 * If we were processing an incomplete multibyte character,
+		 * return an error since we have a KEY_xxx code which
+		 * interrupts it.  For some cases, we could improve this by
+		 * writing a new version of lib_getch.c(!), but it is not clear
+		 * whether the improvement would be worth the effort.
+		 */
+		if (count != 0) {
+		    safe_ungetch(SP_PARM, value);
+		    code = ERR;
+		}
+		break;
+	    } else if (count + 1 >= sizeof(buffer)) {
+		safe_ungetch(SP_PARM, value);
+		code = ERR;
+		break;
+	    } else {
+		int status;
+
+		buffer[count++] = (char) UChar(value);
+		reset_mbytes(state);
+		status = count_mbytes(buffer, count, state);
+		if (status >= 0) {
+		    wchar_t wch;
+		    reset_mbytes(state);
+		    if (check_mbytes(wch, buffer, count, state) != status) {
+			code = ERR;	/* the two calls should match */
+			safe_ungetch(SP_PARM, value);
+		    }
+		    value = wch;
+		    break;
+		}
+	    }
+	}
+    } else {
+	code = ERR;
+    }
+
+    if (result != 0)
+	*result = (wint_t) value;
+
+    _nc_unlock_global(curses);
+    T(("result %#o", value));
+    returnCode(code);
+}