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Annotation of 43BSDReno/usr.bin/window/wwdelchar.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1983 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * This code is derived from software contributed to Berkeley by
                      6:  * Edward Wang at The University of California, Berkeley.
                      7:  *
                      8:  * Redistribution and use in source and binary forms are permitted provided
                      9:  * that: (1) source distributions retain this entire copyright notice and
                     10:  * comment, and (2) distributions including binaries display the following
                     11:  * acknowledgement:  ``This product includes software developed by the
                     12:  * University of California, Berkeley and its contributors'' in the
                     13:  * documentation or other materials provided with the distribution and in
                     14:  * all advertising materials mentioning features or use of this software.
                     15:  * Neither the name of the University nor the names of its contributors may
                     16:  * be used to endorse or promote products derived from this software without
                     17:  * specific prior written permission.
                     18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     19:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     20:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     21:  */
                     22: 
                     23: #ifndef lint
                     24: static char sccsid[] = "@(#)wwdelchar.c        3.16 (Berkeley) 6/6/90";
                     25: #endif /* not lint */
                     26: 
                     27: #include "ww.h"
                     28: #include "tt.h"
                     29: 
                     30: wwdelchar(w, row, col)
                     31: register struct ww *w;
                     32: {
                     33:        register i;
                     34:        int nvis;
                     35: 
                     36:        /*
                     37:         * First, shift the line.
                     38:         */
                     39:        {
                     40:                register union ww_char *p, *q;
                     41: 
                     42:                p = &w->ww_buf[row][col];
                     43:                q = p + 1;
                     44:                for (i = w->ww_b.r - col; --i > 0;)
                     45:                        *p++ = *q++;
                     46:                p->c_w = ' ';
                     47:        }
                     48: 
                     49:        /*
                     50:         * If can't see it, just return.
                     51:         */
                     52:        if (row < w->ww_i.t || row >= w->ww_i.b
                     53:            || w->ww_i.r <= 0 || w->ww_i.r <= col)
                     54:                return;
                     55: 
                     56:        if (col < w->ww_i.l)
                     57:                col = w->ww_i.l;
                     58: 
                     59:        /*
                     60:         * Now find out how much is actually changed, and fix wwns.
                     61:         */
                     62:        {
                     63:                register union ww_char *buf;
                     64:                register char *win;
                     65:                register union ww_char *ns;
                     66:                register char *smap;
                     67:                char touched;
                     68: 
                     69:                nvis = 0;
                     70:                smap = &wwsmap[row][col];
                     71:                for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++)
                     72:                        ;
                     73:                if (i >= w->ww_i.r)
                     74:                        return;
                     75:                col = i;
                     76:                buf = w->ww_buf[row];
                     77:                win = w->ww_win[row];
                     78:                ns = wwns[row];
                     79:                smap = &wwsmap[row][i];
                     80:                touched = wwtouched[row];
                     81:                for (; i < w->ww_i.r; i++) {
                     82:                        if (*smap++ != w->ww_index)
                     83:                                continue;
                     84:                        touched |= WWU_TOUCHED;
                     85:                        if (win[i])
                     86:                                ns[i].c_w =
                     87:                                        buf[i].c_w ^ win[i] << WWC_MSHIFT;
                     88:                        else {
                     89:                                nvis++;
                     90:                                ns[i] = buf[i];
                     91:                        }
                     92:                }
                     93:                wwtouched[row] = touched;
                     94:        }
                     95: 
                     96:        /*
                     97:         * Can/Should we use delete character?
                     98:         */
                     99:        if (tt.tt_delchar != 0 && nvis > (wwncol - col) / 2) {
                    100:                register union ww_char *p, *q;
                    101: 
                    102:                xxdelchar(row, col);
                    103:                p = &wwos[row][col];
                    104:                q = p + 1;
                    105:                for (i = wwncol - col; --i > 0;)
                    106:                        *p++ = *q++;
                    107:                p->c_w = ' ';
                    108:        }
                    109: }

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