aboutsummaryrefslogtreecommitdiff
path: root/ncurses/widechar/lib_unget_wch.c
diff options
context:
space:
mode:
Diffstat (limited to 'ncurses/widechar/lib_unget_wch.c')
-rw-r--r--ncurses/widechar/lib_unget_wch.c103
1 files changed, 103 insertions, 0 deletions
diff --git a/ncurses/widechar/lib_unget_wch.c b/ncurses/widechar/lib_unget_wch.c
new file mode 100644
index 000000000000..b2dc7ff96f1b
--- /dev/null
+++ b/ncurses/widechar/lib_unget_wch.c
@@ -0,0 +1,103 @@
+/****************************************************************************
+ * Copyright (c) 2002-2004,2007 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 1.9 2007/11/25 00:57:00 tom Exp $")
+
+/*
+ * Wrapper for wcrtomb() which obtains the length needed for the given
+ * wide-character 'source'.
+ */
+NCURSES_EXPORT(size_t)
+_nc_wcrtomb(char *target, wchar_t source, mbstate_t * state)
+{
+ int result;
+
+ if (target == 0) {
+ wchar_t temp[2];
+ const wchar_t *tempp = temp;
+ temp[0] = source;
+ temp[1] = 0;
+ result = wcsrtombs(NULL, &tempp, 0, state);
+ } else {
+ result = wcrtomb(target, source, state);
+ }
+ if (!isEILSEQ(result) && (result == 0))
+ result = 1;
+ return result;
+}
+
+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)"), (unsigned long) wch));
+
+ init_mb(state);
+ length = _nc_wcrtomb(0, wch, &state);
+
+ if (length != (size_t) (-1)
+ && length != 0) {
+ char *string;
+
+ if ((string = (char *) malloc(length)) != 0) {
+ init_mb(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;
+ }
+ } else {
+ result = ERR;
+ }
+
+ returnCode(result);
+}