usr/src/lib/libcurses/screen/ungetwch.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*  Copyright (c) 1988 AT&T */
  23 /*    All Rights Reserved   */
  24
  25
  26 /*
  27  *      Copyright (c) 1997, by Sun Microsystems, Inc.
  28  *      All rights reserved.
  29  */
  30
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"
  32
  33 /*LINTLIBRARY*/
  34
  35 #include        <sys/types.h>
  36 #include        "curses_inc.h"
  37
  38 /*
  39  *      Push a process code back into the input stream
  40  */
  41
  42 int
  43 ungetwch(wchar_t code)
  44 {
  45         int     i, n;
  46         char    buf[CSMAX];
  47
  48         n = _curs_wctomb(buf, code & TRIM);
  49         for (i = n - 1; i >= 0; --i)
  50                 if (ungetch((unsigned char)buf[i]) == ERR) {
  51                         /* remove inserted characters */
  52                         for (i = i + 1; i < n; ++i)
  53                                 (void) tgetch(0);
  54                         return (ERR);
  55                 }
  56
  57         return (OK);
  58 }