usr/src/lib/libcurses/screen/mbinsshift.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  *      Shift right an interval of characters
  40  */
  41
  42 int
  43 _mbinsshift(WINDOW *win, int len)
  44 {
  45         int     x, y, maxx,  mv;
  46         chtype  *wcp, *wp, *ep;
  47
  48         y = win->_cury;
  49         x = win->_curx;
  50         maxx = win->_maxx;
  51         wcp  = win->_y[y];
  52
  53         /* ASSERT(!ISCBIT(wcp[x])); */
  54
  55         /* shift up to a whole character */
  56         if (_scrmax > 1) {
  57                 wp = wcp + maxx - 1;
  58                 if (ISMBIT(*wp)) {
  59                         reg chtype      rb;
  60
  61                         for (; wp >= wcp; --wp)
  62                                 if (!ISCBIT(*wp))
  63                                         break;
  64                         if (wp < wcp)
  65                                 return (ERR);
  66                         rb = RBYTE(*wp);
  67                         if ((wp + _curs_scrwidth[TYPE(rb)]) > (wcp + maxx))
  68                                 /*LINTED*/
  69                                 maxx = (int)(wp - wcp);
  70                         }
  71                 }
  72
  73         /* see if any data need to move */
  74         if ((mv = maxx - (x+len)) <= 0)
  75                 return (OK);
  76
  77         /* the end of the moved interval must be whole */
  78         if (ISCBIT(wcp[x + mv]))
  79                 (void) _mbclrch(win, y, x + mv - 1);
  80
  81         /* move data */
  82         ep = wcp + x + len;
  83         for (wp = wcp + maxx - 1; wp >= ep; --wp)
  84                 *wp = *(wp - len);
  85
  86         /* clear a possible partial multibyte character */
  87         if (ISMBIT(*wp))
  88                 for (ep = wp; ep >= wcp; --ep) {
  89                         mv = (int)(ISCBIT(*ep));
  90                         *ep = win->_bkgd;
  91                         if (!mv)
  92                                 break;
  93                 }
  94
  95         /* update the change structure */
  96         if (x < win->_firstch[y])
  97                 /*LINTED*/
  98                 win->_firstch[y] = (short)x;
  99         win->_lastch[y] = maxx - 1;
 100
 101         return (OK);
 102 }