ncurses 5.3

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

diff --git a/ncurses/widechar/lib_get_wch.c b/ncurses/widechar/lib_get_wch.c
new file mode 100644 (file)
index 0000000..e2a7ce5
--- /dev/null
+++ b/ncurses/widechar/lib_get_wch.c
@@ -0,0 +1,99 @@
+/****************************************************************************
+ * 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_get_wch.c
+**
+**     The routine get_wch().
+**
+*/
+
+#include <curses.priv.h>
+
+MODULE_ID("$Id: lib_get_wch.c,v 1.5 2002/09/02 00:04:25 tom Exp $")
+
+NCURSES_EXPORT(int)
+wget_wch(WINDOW *win, wint_t * result)
+{
+    int code;
+    char buffer[(MB_LEN_MAX * 9) + 1]; /* allow some redundant shifts */
+    int status;
+    mbstate_t state;
+    size_t count = 0;
+    unsigned long value;
+    wchar_t wch;
+
+    T((T_CALLED("wget_wch(%p)"), 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.
+     */
+    for (;;) {
+       T(("reading %d of %d", count + 1, sizeof(buffer)));
+       code = _nc_wgetch(win, &value, TRUE);
+       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) {
+               ungetch(value);
+               code = ERR;
+           }
+           break;
+       } else if (count + 1 >= sizeof(buffer)) {
+           ungetch(value);
+           code = ERR;
+           break;
+       } else {
+           buffer[count++] = UChar(value);
+           memset(&state, 0, sizeof(state));
+           status = mbrlen(buffer, count, &state);
+           if (status >= 0) {
+               memset(&state, 0, sizeof(state));
+               if ((int) mbrtowc(&wch, buffer, count, &state) != status) {
+                   code = ERR; /* the two calls should match */
+               }
+               value = wch;
+               break;
+           }
+       }
+    }
+    *result = value;
+    T(("result %#lo", value));
+    returnCode(code);
+}