Annotation of src/usr.bin/talk/display.c, Revision 1.1
1.1 ! deraadt 1: /* $NetBSD: display.c,v 1.3 1994/12/09 02:14:13 jtc Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 1983, 1993
! 5: * The Regents of the University of California. All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: * 3. All advertising materials mentioning features or use of this software
! 16: * must display the following acknowledgement:
! 17: * This product includes software developed by the University of
! 18: * California, Berkeley and its contributors.
! 19: * 4. Neither the name of the University nor the names of its contributors
! 20: * may be used to endorse or promote products derived from this software
! 21: * without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 33: * SUCH DAMAGE.
! 34: */
! 35:
! 36: #ifndef lint
! 37: #if 0
! 38: static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93";
! 39: #endif
! 40: static char rcsid[] = "$NetBSD: display.c,v 1.3 1994/12/09 02:14:13 jtc Exp $";
! 41: #endif /* not lint */
! 42:
! 43: /*
! 44: * The window 'manager', initializes curses and handles the actual
! 45: * displaying of text
! 46: */
! 47: #include "talk.h"
! 48:
! 49: xwin_t my_win;
! 50: xwin_t his_win;
! 51: WINDOW *line_win;
! 52:
! 53: int curses_initialized = 0;
! 54:
! 55: /*
! 56: * max HAS to be a function, it is called with
! 57: * a argument of the form --foo at least once.
! 58: */
! 59: max(a,b)
! 60: int a, b;
! 61: {
! 62:
! 63: return (a > b ? a : b);
! 64: }
! 65:
! 66: /*
! 67: * Display some text on somebody's window, processing some control
! 68: * characters while we are at it.
! 69: */
! 70: display(win, text, size)
! 71: register xwin_t *win;
! 72: register char *text;
! 73: int size;
! 74: {
! 75: register int i;
! 76: char cch;
! 77:
! 78: for (i = 0; i < size; i++) {
! 79: if (*text == '\n') {
! 80: xscroll(win, 0);
! 81: text++;
! 82: continue;
! 83: }
! 84: /* erase character */
! 85: if (*text == win->cerase) {
! 86: wmove(win->x_win, win->x_line, max(--win->x_col, 0));
! 87: getyx(win->x_win, win->x_line, win->x_col);
! 88: waddch(win->x_win, ' ');
! 89: wmove(win->x_win, win->x_line, win->x_col);
! 90: getyx(win->x_win, win->x_line, win->x_col);
! 91: text++;
! 92: continue;
! 93: }
! 94: /*
! 95: * On word erase search backwards until we find
! 96: * the beginning of a word or the beginning of
! 97: * the line.
! 98: */
! 99: if (*text == win->werase) {
! 100: int endcol, xcol, i, c;
! 101:
! 102: endcol = win->x_col;
! 103: xcol = endcol - 1;
! 104: while (xcol >= 0) {
! 105: c = readwin(win->x_win, win->x_line, xcol);
! 106: if (c != ' ')
! 107: break;
! 108: xcol--;
! 109: }
! 110: while (xcol >= 0) {
! 111: c = readwin(win->x_win, win->x_line, xcol);
! 112: if (c == ' ')
! 113: break;
! 114: xcol--;
! 115: }
! 116: wmove(win->x_win, win->x_line, xcol + 1);
! 117: for (i = xcol + 1; i < endcol; i++)
! 118: waddch(win->x_win, ' ');
! 119: wmove(win->x_win, win->x_line, xcol + 1);
! 120: getyx(win->x_win, win->x_line, win->x_col);
! 121: text++;
! 122: continue;
! 123: }
! 124: /* line kill */
! 125: if (*text == win->kill) {
! 126: wmove(win->x_win, win->x_line, 0);
! 127: wclrtoeol(win->x_win);
! 128: getyx(win->x_win, win->x_line, win->x_col);
! 129: text++;
! 130: continue;
! 131: }
! 132: if (*text == '\f') {
! 133: if (win == &my_win)
! 134: wrefresh(curscr);
! 135: text++;
! 136: continue;
! 137: }
! 138: if (win->x_col == COLS-1) {
! 139: /* check for wraparound */
! 140: xscroll(win, 0);
! 141: }
! 142: if (*text < ' ' && *text != '\t') {
! 143: waddch(win->x_win, '^');
! 144: getyx(win->x_win, win->x_line, win->x_col);
! 145: if (win->x_col == COLS-1) /* check for wraparound */
! 146: xscroll(win, 0);
! 147: cch = (*text & 63) + 64;
! 148: waddch(win->x_win, cch);
! 149: } else
! 150: waddch(win->x_win, *text);
! 151: getyx(win->x_win, win->x_line, win->x_col);
! 152: text++;
! 153: }
! 154: wrefresh(win->x_win);
! 155: }
! 156:
! 157: /*
! 158: * Read the character at the indicated position in win
! 159: */
! 160: readwin(win, line, col)
! 161: WINDOW *win;
! 162: {
! 163: int oldline, oldcol;
! 164: register int c;
! 165:
! 166: getyx(win, oldline, oldcol);
! 167: wmove(win, line, col);
! 168: c = winch(win);
! 169: wmove(win, oldline, oldcol);
! 170: return (c);
! 171: }
! 172:
! 173: /*
! 174: * Scroll a window, blanking out the line following the current line
! 175: * so that the current position is obvious
! 176: */
! 177: xscroll(win, flag)
! 178: register xwin_t *win;
! 179: int flag;
! 180: {
! 181:
! 182: if (flag == -1) {
! 183: wmove(win->x_win, 0, 0);
! 184: win->x_line = 0;
! 185: win->x_col = 0;
! 186: return;
! 187: }
! 188: win->x_line = (win->x_line + 1) % win->x_nlines;
! 189: win->x_col = 0;
! 190: wmove(win->x_win, win->x_line, win->x_col);
! 191: wclrtoeol(win->x_win);
! 192: wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col);
! 193: wclrtoeol(win->x_win);
! 194: wmove(win->x_win, win->x_line, win->x_col);
! 195: }
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