diff options
Diffstat (limited to 'usr.bin/talk/display.c')
| -rw-r--r-- | usr.bin/talk/display.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/usr.bin/talk/display.c b/usr.bin/talk/display.c new file mode 100644 index 000000000000..aafe55204068 --- /dev/null +++ b/usr.bin/talk/display.c @@ -0,0 +1,206 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * 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 <ctype.h> +#include <unistd.h> +#include <wctype.h> +#define _XOPEN_SOURCE_EXTENDED +#include <curses.h> + +#include "talk.h" + +void display(xwin_t *, wchar_t *); + +xwin_t my_win; +xwin_t his_win; +WINDOW *line_win; + +int curses_initialized = 0; + +/* + * max HAS to be a function, it is called with + * an argument of the form --foo at least once. + */ +int +max(int a, int b) +{ + + return (a > b ? a : b); +} + +static cchar_t * +makecchar(wchar_t in) +{ + static cchar_t cc; + wchar_t wc[2]; + + wc[0] = in; + wc[1] = L'\0'; + + if (setcchar(&cc, wc, A_NORMAL, 0, NULL) != OK) + p_error("settchar(3) failure"); + + return (&cc); +} + +/* + * Display a symbol on somebody's window, processing some control + * characters while we are at it. + */ +void +display(xwin_t *win, wchar_t *wc) +{ + + /* + * Alas, can't use variables in C switch statement. + * Workaround these 3 cases with goto. + */ + if (*wc == win->kill) + goto kill; + else if (*wc == win->cerase) + goto cerase; + else if (*wc == win->werase) + goto werase; + + switch (*wc) { + case L'\n': + case L'\r': + wadd_wch(win->x_win, makecchar(L'\n')); + getyx(win->x_win, win->x_line, win->x_col); + wrefresh(win->x_win); + return; + + case 004: + if (win == &my_win) { + /* Ctrl-D clears the screen. */ + werase(my_win.x_win); + getyx(my_win.x_win, my_win.x_line, my_win.x_col); + wrefresh(my_win.x_win); + werase(his_win.x_win); + getyx(his_win.x_win, his_win.x_line, his_win.x_col); + wrefresh(his_win.x_win); + } + return; + + /* Erase character. */ + case 010: /* BS */ + case 0177: /* DEL */ +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); + wrefresh(win->x_win); + return; + + case 027: /* ^W */ +werase: + { + /* + * On word erase search backwards until we find + * the beginning of a word or the beginning of + * the line. + */ + int endcol, xcol, 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 (int 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); + wrefresh(win->x_win); + return; + } + + case 025: /* ^U */ +kill: + wmove(win->x_win, win->x_line, 0); + wclrtoeol(win->x_win); + getyx(win->x_win, win->x_line, win->x_col); + wrefresh(win->x_win); + return; + + case L'\f': + if (win == &my_win) + wrefresh(curscr); + return; + + case L'\7': + write(STDOUT_FILENO, wc, sizeof(*wc)); + return; + } + + + if (iswprint(*wc) || *wc == L'\t') + wadd_wch(win->x_win, makecchar(*wc)); + else + beep(); + + getyx(win->x_win, win->x_line, win->x_col); + wrefresh(win->x_win); +} + +/* + * Read the character at the indicated position in win + */ +int +readwin(WINDOW *win, int line, int col) +{ + int oldline, oldcol; + int c; + + getyx(win, oldline, oldcol); + wmove(win, line, col); + c = winch(win); + wmove(win, oldline, oldcol); + return (c); +} |