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Annotation of 43BSDTahoe/ucb/talk/display.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[] = "@(#)display.c  5.3 (Berkeley) 6/29/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: /*
        !            23:  * The window 'manager', initializes curses and handles the actual
        !            24:  * displaying of text
        !            25:  */
        !            26: #include "talk.h"
        !            27: 
        !            28: xwin_t my_win;
        !            29: xwin_t his_win;
        !            30: WINDOW *line_win;
        !            31: 
        !            32: int    curses_initialized = 0;
        !            33: 
        !            34: /*
        !            35:  * max HAS to be a function, it is called with
        !            36:  * a argument of the form --foo at least once.
        !            37:  */
        !            38: max(a,b)
        !            39:        int a, b;
        !            40: {
        !            41: 
        !            42:        return (a > b ? a : b);
        !            43: }
        !            44: 
        !            45: /*
        !            46:  * Display some text on somebody's window, processing some control
        !            47:  * characters while we are at it.
        !            48:  */
        !            49: display(win, text, size)
        !            50:        register xwin_t *win;
        !            51:        register char *text;
        !            52:        int size;
        !            53: {
        !            54:        register int i;
        !            55:        char cch;
        !            56: 
        !            57:        for (i = 0; i < size; i++) {
        !            58:                if (*text == '\n') {
        !            59:                        xscroll(win, 0);
        !            60:                        text++;
        !            61:                        continue;
        !            62:                }
        !            63:                /* erase character */
        !            64:                if (*text == win->cerase) {
        !            65:                        wmove(win->x_win, win->x_line, max(--win->x_col, 0));
        !            66:                        getyx(win->x_win, win->x_line, win->x_col);
        !            67:                        waddch(win->x_win, ' ');
        !            68:                        wmove(win->x_win, win->x_line, win->x_col);
        !            69:                        getyx(win->x_win, win->x_line, win->x_col);
        !            70:                        text++;
        !            71:                        continue;
        !            72:                }
        !            73:                /*
        !            74:                 * On word erase search backwards until we find
        !            75:                 * the beginning of a word or the beginning of
        !            76:                 * the line.
        !            77:                 */
        !            78:                if (*text == win->werase) {
        !            79:                        int endcol, xcol, i, c;
        !            80: 
        !            81:                        endcol = win->x_col;
        !            82:                        xcol = endcol - 1;
        !            83:                        while (xcol >= 0) {
        !            84:                                c = readwin(win->x_win, win->x_line, xcol);
        !            85:                                if (c != ' ')
        !            86:                                        break;
        !            87:                                xcol--;
        !            88:                        }
        !            89:                        while (xcol >= 0) {
        !            90:                                c = readwin(win->x_win, win->x_line, xcol);
        !            91:                                if (c == ' ')
        !            92:                                        break;
        !            93:                                xcol--;
        !            94:                        }
        !            95:                        wmove(win->x_win, win->x_line, xcol + 1);
        !            96:                        for (i = xcol + 1; i < endcol; i++)
        !            97:                                waddch(win->x_win, ' ');
        !            98:                        wmove(win->x_win, win->x_line, xcol + 1);
        !            99:                        getyx(win->x_win, win->x_line, win->x_col);
        !           100:                        continue;
        !           101:                }
        !           102:                /* line kill */
        !           103:                if (*text == win->kill) {
        !           104:                        wmove(win->x_win, win->x_line, 0);
        !           105:                        wclrtoeol(win->x_win);
        !           106:                        getyx(win->x_win, win->x_line, win->x_col);
        !           107:                        text++;
        !           108:                        continue;
        !           109:                }
        !           110:                if (*text == '\f') {
        !           111:                        if (win == &my_win)
        !           112:                                wrefresh(curscr);
        !           113:                        text++;
        !           114:                        continue;
        !           115:                }
        !           116:                if (win->x_col == COLS-1) {
        !           117:                        /* check for wraparound */
        !           118:                        xscroll(win, 0);
        !           119:                }
        !           120:                if (*text < ' ' && *text != '\t') {
        !           121:                        waddch(win->x_win, '^');
        !           122:                        getyx(win->x_win, win->x_line, win->x_col);
        !           123:                        if (win->x_col == COLS-1) /* check for wraparound */
        !           124:                                xscroll(win, 0);
        !           125:                        cch = (*text & 63) + 64;
        !           126:                        waddch(win->x_win, cch);
        !           127:                } else
        !           128:                        waddch(win->x_win, *text);
        !           129:                getyx(win->x_win, win->x_line, win->x_col);
        !           130:                text++;
        !           131:        }
        !           132:        wrefresh(win->x_win);
        !           133: }
        !           134: 
        !           135: /*
        !           136:  * Read the character at the indicated position in win
        !           137:  */
        !           138: readwin(win, line, col)
        !           139:        WINDOW *win;
        !           140: {
        !           141:        int oldline, oldcol;
        !           142:        register int c;
        !           143: 
        !           144:        getyx(win, oldline, oldcol);
        !           145:        wmove(win, line, col);
        !           146:        c = winch(win);
        !           147:        wmove(win, oldline, oldcol);
        !           148:        return (c);
        !           149: }
        !           150: 
        !           151: /*
        !           152:  * Scroll a window, blanking out the line following the current line
        !           153:  * so that the current position is obvious
        !           154:  */
        !           155: xscroll(win, flag)
        !           156:        register xwin_t *win;
        !           157:        int flag;
        !           158: {
        !           159: 
        !           160:        if (flag == -1) {
        !           161:                wmove(win->x_win, 0, 0);
        !           162:                win->x_line = 0;
        !           163:                win->x_col = 0;
        !           164:                return;
        !           165:        }
        !           166:        win->x_line = (win->x_line + 1) % win->x_nlines;
        !           167:        win->x_col = 0;
        !           168:        wmove(win->x_win, win->x_line, win->x_col);
        !           169:        wclrtoeol(win->x_win);
        !           170:        wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col);
        !           171:        wclrtoeol(win->x_win);
        !           172:        wmove(win->x_win, win->x_line, win->x_col);
        !           173: }

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