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Annotation of 43BSDTahoe/ucb/window/wwclreol.c, revision 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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