/* $OpenBSD: display.c,v 1.15 2009/10/27 23:59:44 deraadt Exp $ */ /* $NetBSD: display.c,v 1.3 1994/12/09 02:14:13 jtc Exp $ */ /* * Copyright (c) 1983, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * The window 'manager', initializes curses and handles the actual * displaying of text */ #include "talk.h" #include xwin_t my_win; xwin_t his_win; WINDOW *line_win; int curses_initialized = 0; int high_print = 0; bool smooth_scroll = FALSE; /* * max HAS to be a function, it is called with * a argument of the form --foo at least once. */ int max(a,b) int a, b; { return (a > b ? a : b); } /* * Display some text on somebody's window, processing some control * characters while we are at it. */ void display(win, text, size) xwin_t *win; char *text; int size; { int i; char cch; for (i = 0; i < size; i++) { /* * Since we do not use curses's input routines we must * convert '\r' -> '\n' ourselves. */ if (*text == '\r') *text = '\n'; if (*text == '\n') { xscroll(win, 0); text++; continue; } /* erase character */ if (*text == win->cerase) { wmove(win->x_win, win->x_line, max(--win->x_col, 0)); getyx(win->x_win, win->x_line, win->x_col); waddch(win->x_win, ' '); wmove(win->x_win, win->x_line, win->x_col); getyx(win->x_win, win->x_line, win->x_col); text++; continue; } /* * On word erase search backwards until we find * the beginning of a word or the beginning of * the line. */ if (*text == win->werase) { int endcol, xcol, i, c; endcol = win->x_col; xcol = endcol - 1; while (xcol >= 0) { c = readwin(win->x_win, win->x_line, xcol); if (c != ' ') break; xcol--; } while (xcol >= 0) { c = readwin(win->x_win, win->x_line, xcol); if (c == ' ') break; xcol--; } wmove(win->x_win, win->x_line, xcol + 1); for (i = xcol + 1; i < endcol; i++) waddch(win->x_win, ' '); wmove(win->x_win, win->x_line, xcol + 1); getyx(win->x_win, win->x_line, win->x_col); text++; continue; } /* line kill */ if (*text == win->kill) { wmove(win->x_win, win->x_line, 0); wclrtoeol(win->x_win); getyx(win->x_win, win->x_line, win->x_col); text++; continue; } if (*text == '\f') { if (win == &my_win) wrefresh(curscr); text++; continue; } if (win->x_col == COLS-1) { /* check for wraparound */ xscroll(win, 0); } if (*text != '\t' && ((!high_print && !isprint(*text)) || iscntrl(*text))) { waddch(win->x_win, '^'); getyx(win->x_win, win->x_line, win->x_col); if (win->x_col == COLS-1) /* check for wraparound */ xscroll(win, 0); cch = (*text & 63) + 64; waddch(win->x_win, cch); } else waddch(win->x_win, (unsigned char)(*text)); getyx(win->x_win, win->x_line, win->x_col); text++; } wrefresh(win->x_win); } /* * Read the character at the indicated position in win */ int readwin(win, line, col) WINDOW *win; int line, col; { int oldline, oldcol; int c; getyx(win, oldline, oldcol); wmove(win, line, col); c = winch(win); wmove(win, oldline, oldcol); return (c); } /* * Scroll a window, blanking out the line following the current line * so that the current position is obvious */ void xscroll(win, flag) xwin_t *win; int flag; { if (flag == -1) { wmove(win->x_win, 0, 0); win->x_line = 0; win->x_col = 0; return; } win->x_col = 0; if (smooth_scroll) { if (++win->x_line == win->x_nlines) { --win->x_line; scroll(win->x_win); } } else { win->x_line = (win->x_line + 1) % win->x_nlines; wmove(win->x_win, win->x_line, win->x_col); wclrtoeol(win->x_win); wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col); wclrtoeol(win->x_win); } wmove(win->x_win, win->x_line, win->x_col); }