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Annotation of src/usr.bin/window/wwdelchar.c, Revision 1.2

1.2     ! niklas      1: /*     $NetBSD: wwdelchar.c,v 1.4 1996/02/08 21:49:00 mycroft Exp $    */
1.1       deraadt     2:
                      3: /*
                      4:  * Copyright (c) 1983, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to Berkeley by
                      8:  * Edward Wang at The University of California, Berkeley.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  * 3. All advertising materials mentioning features or use of this software
                     19:  *    must display the following acknowledgement:
                     20:  *     This product includes software developed by the University of
                     21:  *     California, Berkeley and its contributors.
                     22:  * 4. Neither the name of the University nor the names of its contributors
                     23:  *    may be used to endorse or promote products derived from this software
                     24:  *    without specific prior written permission.
                     25:  *
                     26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     36:  * SUCH DAMAGE.
                     37:  */
                     38:
                     39: #ifndef lint
                     40: #if 0
                     41: static char sccsid[] = "@(#)wwdelchar.c        8.1 (Berkeley) 6/6/93";
                     42: #else
1.2     ! niklas     43: static char rcsid[] = "$NetBSD: wwdelchar.c,v 1.4 1996/02/08 21:49:00 mycroft Exp $";
1.1       deraadt    44: #endif
                     45: #endif /* not lint */
                     46:
                     47: #include "ww.h"
                     48: #include "tt.h"
                     49:
                     50: wwdelchar(w, row, col)
                     51: register struct ww *w;
                     52: {
                     53:        register i;
                     54:        int nvis;
                     55:
                     56:        /*
                     57:         * First, shift the line.
                     58:         */
                     59:        {
                     60:                register union ww_char *p, *q;
                     61:
                     62:                p = &w->ww_buf[row][col];
                     63:                q = p + 1;
                     64:                for (i = w->ww_b.r - col; --i > 0;)
                     65:                        *p++ = *q++;
                     66:                p->c_w = ' ';
                     67:        }
                     68:
                     69:        /*
                     70:         * If can't see it, just return.
                     71:         */
                     72:        if (row < w->ww_i.t || row >= w->ww_i.b
                     73:            || w->ww_i.r <= 0 || w->ww_i.r <= col)
                     74:                return;
                     75:
                     76:        if (col < w->ww_i.l)
                     77:                col = w->ww_i.l;
                     78:
                     79:        /*
                     80:         * Now find out how much is actually changed, and fix wwns.
                     81:         */
                     82:        {
                     83:                register union ww_char *buf;
                     84:                register char *win;
                     85:                register union ww_char *ns;
1.2     ! niklas     86:                register unsigned char *smap;
1.1       deraadt    87:                char touched;
                     88:
                     89:                nvis = 0;
                     90:                smap = &wwsmap[row][col];
                     91:                for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++)
                     92:                        ;
                     93:                if (i >= w->ww_i.r)
                     94:                        return;
                     95:                col = i;
                     96:                buf = w->ww_buf[row];
                     97:                win = w->ww_win[row];
                     98:                ns = wwns[row];
                     99:                smap = &wwsmap[row][i];
                    100:                touched = wwtouched[row];
                    101:                for (; i < w->ww_i.r; i++) {
                    102:                        if (*smap++ != w->ww_index)
                    103:                                continue;
                    104:                        touched |= WWU_TOUCHED;
                    105:                        if (win[i])
                    106:                                ns[i].c_w =
                    107:                                        buf[i].c_w ^ win[i] << WWC_MSHIFT;
                    108:                        else {
                    109:                                nvis++;
                    110:                                ns[i] = buf[i];
                    111:                        }
                    112:                }
                    113:                wwtouched[row] = touched;
                    114:        }
                    115:
                    116:        /*
                    117:         * Can/Should we use delete character?
                    118:         */
                    119:        if (tt.tt_delchar != 0 && nvis > (wwncol - col) / 2) {
                    120:                register union ww_char *p, *q;
                    121:
                    122:                xxdelchar(row, col);
                    123:                p = &wwos[row][col];
                    124:                q = p + 1;
                    125:                for (i = wwncol - col; --i > 0;)
                    126:                        *p++ = *q++;
                    127:                p->c_w = ' ';
                    128:        }
                    129: }