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Annotation of src/usr.bin/window/wwdelchar.c, Revision 1.6

1.6     ! millert     1: /*     $OpenBSD: wwdelchar.c,v 1.5 2001/11/19 19:02:18 mpech Exp $     */
1.2       niklas      2: /*     $NetBSD: wwdelchar.c,v 1.4 1996/02/08 21:49:00 mycroft Exp $    */
1.1       deraadt     3:
                      4: /*
                      5:  * Copyright (c) 1983, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * This code is derived from software contributed to Berkeley by
                      9:  * Edward Wang at The University of California, Berkeley.
                     10:  *
                     11:  * Redistribution and use in source and binary forms, with or without
                     12:  * modification, are permitted provided that the following conditions
                     13:  * are met:
                     14:  * 1. Redistributions of source code must retain the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer.
                     16:  * 2. Redistributions in binary form must reproduce the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer in the
                     18:  *    documentation and/or other materials provided with the distribution.
1.6     ! millert    19:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
                     35:
                     36: #ifndef lint
                     37: #if 0
                     38: static char sccsid[] = "@(#)wwdelchar.c        8.1 (Berkeley) 6/6/93";
                     39: #else
1.6     ! millert    40: static char rcsid[] = "$OpenBSD: wwdelchar.c,v 1.5 2001/11/19 19:02:18 mpech Exp $";
1.1       deraadt    41: #endif
                     42: #endif /* not lint */
                     43:
                     44: #include "ww.h"
                     45: #include "tt.h"
                     46:
                     47: wwdelchar(w, row, col)
1.5       mpech      48: struct ww *w;
1.1       deraadt    49: {
1.5       mpech      50:        int i;
1.1       deraadt    51:        int nvis;
                     52:
                     53:        /*
                     54:         * First, shift the line.
                     55:         */
                     56:        {
1.5       mpech      57:                union ww_char *p, *q;
1.1       deraadt    58:
                     59:                p = &w->ww_buf[row][col];
                     60:                q = p + 1;
                     61:                for (i = w->ww_b.r - col; --i > 0;)
                     62:                        *p++ = *q++;
                     63:                p->c_w = ' ';
                     64:        }
                     65:
                     66:        /*
                     67:         * If can't see it, just return.
                     68:         */
                     69:        if (row < w->ww_i.t || row >= w->ww_i.b
                     70:            || w->ww_i.r <= 0 || w->ww_i.r <= col)
                     71:                return;
                     72:
                     73:        if (col < w->ww_i.l)
                     74:                col = w->ww_i.l;
                     75:
                     76:        /*
                     77:         * Now find out how much is actually changed, and fix wwns.
                     78:         */
                     79:        {
1.5       mpech      80:                union ww_char *buf;
                     81:                char *win;
                     82:                union ww_char *ns;
                     83:                unsigned char *smap;
1.1       deraadt    84:                char touched;
                     85:
                     86:                nvis = 0;
                     87:                smap = &wwsmap[row][col];
                     88:                for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++)
                     89:                        ;
                     90:                if (i >= w->ww_i.r)
                     91:                        return;
                     92:                col = i;
                     93:                buf = w->ww_buf[row];
                     94:                win = w->ww_win[row];
                     95:                ns = wwns[row];
                     96:                smap = &wwsmap[row][i];
                     97:                touched = wwtouched[row];
                     98:                for (; i < w->ww_i.r; i++) {
                     99:                        if (*smap++ != w->ww_index)
                    100:                                continue;
                    101:                        touched |= WWU_TOUCHED;
                    102:                        if (win[i])
                    103:                                ns[i].c_w =
                    104:                                        buf[i].c_w ^ win[i] << WWC_MSHIFT;
                    105:                        else {
                    106:                                nvis++;
                    107:                                ns[i] = buf[i];
                    108:                        }
                    109:                }
                    110:                wwtouched[row] = touched;
                    111:        }
                    112:
                    113:        /*
                    114:         * Can/Should we use delete character?
                    115:         */
                    116:        if (tt.tt_delchar != 0 && nvis > (wwncol - col) / 2) {
1.5       mpech     117:                union ww_char *p, *q;
1.1       deraadt   118:
                    119:                xxdelchar(row, col);
                    120:                p = &wwos[row][col];
                    121:                q = p + 1;
                    122:                for (i = wwncol - col; --i > 0;)
                    123:                        *p++ = *q++;
                    124:                p->c_w = ' ';
                    125:        }
                    126: }