ncurses 5.3

[ncurses.git] / ncurses / widechar / lib_unget_wch.c

diff --git a/ncurses/widechar/lib_unget_wch.c b/ncurses/widechar/lib_unget_wch.c
new file mode 100644 (file)
index 0000000..7a062fd
--- /dev/null
+++ b/ncurses/widechar/lib_unget_wch.c
@@ -0,0 +1,76 @@
+/****************************************************************************
+ * Copyright (c) 2002 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                                           *
+ ****************************************************************************/
+
+/*
+**     lib_unget_wch.c
+**
+**     The routine unget_wch().
+**
+*/
+
+#include <curses.priv.h>
+
+MODULE_ID("$Id: lib_unget_wch.c,v 1.3 2002/06/29 21:11:02 tom Exp $")
+
+NCURSES_EXPORT(int)
+unget_wch(const wchar_t wch)
+{
+    int result = OK;
+    mbstate_t state;
+    size_t length;
+    int n;
+
+    T((T_CALLED("unget_wch(%#lx)"), wch));
+
+    memset(&state, 0, sizeof(state));
+    length = wcrtomb(0, wch, &state);
+
+    if (length != (size_t) (-1)
+       && length != 0) {
+       char *string = malloc(length);
+
+       memset(&state, 0, sizeof(state));
+       wcrtomb(string, wch, &state);
+
+       for (n = (int) (length - 1); n >= 0; --n) {
+           if (ungetch(string[n]) != OK) {
+               result = ERR;
+               break;
+           }
+       }
+       free(string);
+    } else {
+       result = ERR;
+    }
+
+    returnCode(result);
+}