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