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Annotation of 43BSDTahoe/ucb/window/wwclreol.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:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  */
                     17: 
                     18: #ifndef lint
                     19: static char sccsid[] = "@(#)wwclreol.c 3.17 (Berkeley) 6/29/88";
                     20: #endif /* not lint */
                     21: 
                     22: #include "ww.h"
                     23: #include "tt.h"
                     24: 
                     25: /*
                     26:  * Clear w to the end of line.
                     27:  * If cleared is true, then the screen line has already been cleared
                     28:  * previously.
                     29:  */
                     30: wwclreol1(w, row, col, cleared)
                     31: register struct ww *w;
                     32: int row, col;
                     33: char cleared;
                     34: {
                     35:        register i;
                     36: 
                     37:        /*
                     38:         * Clear the buffer right off
                     39:         */
                     40:        {
                     41:                register union ww_char *buf;
                     42: 
                     43:                buf = &w->ww_buf[row][col]; 
                     44:                for (i = w->ww_b.r - col; --i >= 0;)
                     45:                        buf++->c_w = ' ';
                     46:        }
                     47: 
                     48:        /*
                     49:         * If can't see it, just return.
                     50:         */
                     51:        if (row < w->ww_i.t || row >= w->ww_i.b
                     52:            || w->ww_i.r <= 0 || w->ww_i.r <= col)
                     53:                return;
                     54: 
                     55:        if (col < w->ww_i.l)
                     56:                col = w->ww_i.l;
                     57: 
                     58:        /*
                     59:         * Now find out how much is actually cleared, and fix wwns.
                     60:         */
                     61:        if (cleared) {
                     62:                register union ww_char *s;
                     63:                register char *smap, *win;
                     64: 
                     65:                i = col;
                     66:                smap = &wwsmap[row][i];
                     67:                s = &wwns[row][i];
                     68:                win = &w->ww_win[row][i];
                     69:                for (i = w->ww_i.r - i; --i >= 0;) {
                     70:                        if (*smap++ != w->ww_index)
                     71:                                continue;
                     72:                        s++->c_w = ' ' | *win++ << WWC_MSHIFT;
                     73:                }
                     74:        } else {
                     75:                register union ww_char *s;
                     76:                register char *smap, *win;
                     77:                int ntouched = 0;
                     78:                int gain = 0;
                     79: 
                     80:                i = col;
                     81:                smap = &wwsmap[row][i];
                     82:                s = wwns[row];
                     83:                win = w->ww_win[row];
                     84:                for (; i < w->ww_i.r; i++) {
                     85:                        if (*smap++ != w->ww_index) {
                     86:                                if (s[i].c_w != ' ')
                     87:                                        gain--;
                     88:                        } else if (win[i] == 0) {
                     89:                                if (s[i].c_w != ' ') {
                     90:                                        gain++;
                     91:                                        ntouched++;
                     92:                                        s[i].c_w = ' ';
                     93:                                }
                     94:                        } else {
                     95:                                short c = ' ' | win[i] << WWC_MSHIFT;
                     96:                                if (s[i].c_w == c)
                     97:                                        gain--;
                     98:                                else {
                     99:                                        s[i].c_w = c;
                    100:                                        ntouched++;
                    101:                                }
                    102:                        }
                    103:                }
                    104:                s += i;
                    105:                for (i = wwncol - i; --i >= 0;)
                    106:                        if (s++->c_w != ' ')
                    107:                                gain--;
                    108:                if (ntouched > 0)
                    109:                        wwtouched[row] |= WWU_TOUCHED;
                    110:                /*
                    111:                 * Can/should we use clear eol?
                    112:                 */
                    113:                if (tt.tt_clreol != 0 && gain > 4) {
                    114:                        /* clear to the end */
                    115:                        (*tt.tt_move)(row, col);
                    116:                        (*tt.tt_clreol)();
                    117:                        s = &wwos[row][col];
                    118:                        for (i = wwncol - col; --i >= 0;)
                    119:                                s++->c_w = ' ';
                    120:                }
                    121:        }
                    122: }

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