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Annotation of src/usr.bin/window/wwdelchar.c, Revision 1.5

1.5     ! mpech       1: /*     $OpenBSD: wwdelchar.c,v 1.4 1997/02/25 00:04:46 downsj 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.
                     19:  * 3. All advertising materials mentioning features or use of this software
                     20:  *    must display the following acknowledgement:
                     21:  *     This product includes software developed by the University of
                     22:  *     California, Berkeley and its contributors.
                     23:  * 4. Neither the name of the University nor the names of its contributors
                     24:  *    may be used to endorse or promote products derived from this software
                     25:  *    without specific prior written permission.
                     26:  *
                     27:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     28:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     29:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     30:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     31:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     32:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     33:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     34:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     35:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     36:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     37:  * SUCH DAMAGE.
                     38:  */
                     39:
                     40: #ifndef lint
                     41: #if 0
                     42: static char sccsid[] = "@(#)wwdelchar.c        8.1 (Berkeley) 6/6/93";
                     43: #else
1.5     ! mpech      44: static char rcsid[] = "$OpenBSD: wwdelchar.c,v 1.4 1997/02/25 00:04:46 downsj Exp $";
1.1       deraadt    45: #endif
                     46: #endif /* not lint */
                     47:
                     48: #include "ww.h"
                     49: #include "tt.h"
                     50:
                     51: wwdelchar(w, row, col)
1.5     ! mpech      52: struct ww *w;
1.1       deraadt    53: {
1.5     ! mpech      54:        int i;
1.1       deraadt    55:        int nvis;
                     56:
                     57:        /*
                     58:         * First, shift the line.
                     59:         */
                     60:        {
1.5     ! mpech      61:                union ww_char *p, *q;
1.1       deraadt    62:
                     63:                p = &w->ww_buf[row][col];
                     64:                q = p + 1;
                     65:                for (i = w->ww_b.r - col; --i > 0;)
                     66:                        *p++ = *q++;
                     67:                p->c_w = ' ';
                     68:        }
                     69:
                     70:        /*
                     71:         * If can't see it, just return.
                     72:         */
                     73:        if (row < w->ww_i.t || row >= w->ww_i.b
                     74:            || w->ww_i.r <= 0 || w->ww_i.r <= col)
                     75:                return;
                     76:
                     77:        if (col < w->ww_i.l)
                     78:                col = w->ww_i.l;
                     79:
                     80:        /*
                     81:         * Now find out how much is actually changed, and fix wwns.
                     82:         */
                     83:        {
1.5     ! mpech      84:                union ww_char *buf;
        !            85:                char *win;
        !            86:                union ww_char *ns;
        !            87:                unsigned char *smap;
1.1       deraadt    88:                char touched;
                     89:
                     90:                nvis = 0;
                     91:                smap = &wwsmap[row][col];
                     92:                for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++)
                     93:                        ;
                     94:                if (i >= w->ww_i.r)
                     95:                        return;
                     96:                col = i;
                     97:                buf = w->ww_buf[row];
                     98:                win = w->ww_win[row];
                     99:                ns = wwns[row];
                    100:                smap = &wwsmap[row][i];
                    101:                touched = wwtouched[row];
                    102:                for (; i < w->ww_i.r; i++) {
                    103:                        if (*smap++ != w->ww_index)
                    104:                                continue;
                    105:                        touched |= WWU_TOUCHED;
                    106:                        if (win[i])
                    107:                                ns[i].c_w =
                    108:                                        buf[i].c_w ^ win[i] << WWC_MSHIFT;
                    109:                        else {
                    110:                                nvis++;
                    111:                                ns[i] = buf[i];
                    112:                        }
                    113:                }
                    114:                wwtouched[row] = touched;
                    115:        }
                    116:
                    117:        /*
                    118:         * Can/Should we use delete character?
                    119:         */
                    120:        if (tt.tt_delchar != 0 && nvis > (wwncol - col) / 2) {
1.5     ! mpech     121:                union ww_char *p, *q;
1.1       deraadt   122:
                    123:                xxdelchar(row, col);
                    124:                p = &wwos[row][col];
                    125:                q = p + 1;
                    126:                for (i = wwncol - col; --i > 0;)
                    127:                        *p++ = *q++;
                    128:                p->c_w = ' ';
                    129:        }
                    130: }