1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 32 __FBSDID("$FreeBSD$"); 33 34 #ifndef lint 35 static const char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93"; 36 #endif 37 38 /* 39 * The window 'manager', initializes curses and handles the actual 40 * displaying of text 41 */ 42 #include <ctype.h> 43 #include <unistd.h> 44 #include <wctype.h> 45 #define _XOPEN_SOURCE_EXTENDED 46 #include <curses.h> 47 48 #include "talk.h" 49 50 void display(xwin_t *, wchar_t *); 51 52 xwin_t my_win; 53 xwin_t his_win; 54 WINDOW *line_win; 55 56 int curses_initialized = 0; 57 58 /* 59 * max HAS to be a function, it is called with 60 * an argument of the form --foo at least once. 61 */ 62 int 63 max(int a, int b) 64 { 65 66 return (a > b ? a : b); 67 } 68 69 static cchar_t * 70 makecchar(wchar_t in) 71 { 72 static cchar_t cc; 73 wchar_t wc[2]; 74 75 wc[0] = in; 76 wc[1] = L'\0'; 77 78 if (setcchar(&cc, wc, A_NORMAL, 0, NULL) != OK) 79 p_error("settchar(3) failure"); 80 81 return (&cc); 82 } 83 84 /* 85 * Display a symbol on somebody's window, processing some control 86 * characters while we are at it. 87 */ 88 void 89 display(xwin_t *win, wchar_t *wc) 90 { 91 92 /* 93 * Alas, can't use variables in C switch statement. 94 * Workaround these 3 cases with goto. 95 */ 96 if (*wc == win->kill) 97 goto kill; 98 else if (*wc == win->cerase) 99 goto cerase; 100 else if (*wc == win->werase) 101 goto werase; 102 103 switch (*wc) { 104 case L'\n': 105 case L'\r': 106 wadd_wch(win->x_win, makecchar(L'\n')); 107 getyx(win->x_win, win->x_line, win->x_col); 108 wrefresh(win->x_win); 109 return; 110 111 case 004: 112 if (win == &my_win) { 113 /* Ctrl-D clears the screen. */ 114 werase(my_win.x_win); 115 getyx(my_win.x_win, my_win.x_line, my_win.x_col); 116 wrefresh(my_win.x_win); 117 werase(his_win.x_win); 118 getyx(his_win.x_win, his_win.x_line, his_win.x_col); 119 wrefresh(his_win.x_win); 120 } 121 return; 122 123 /* Erase character. */ 124 case 010: /* BS */ 125 case 0177: /* DEL */ 126 cerase: 127 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 128 getyx(win->x_win, win->x_line, win->x_col); 129 waddch(win->x_win, ' '); 130 wmove(win->x_win, win->x_line, win->x_col); 131 getyx(win->x_win, win->x_line, win->x_col); 132 wrefresh(win->x_win); 133 return; 134 135 case 027: /* ^W */ 136 werase: 137 { 138 /* 139 * On word erase search backwards until we find 140 * the beginning of a word or the beginning of 141 * the line. 142 */ 143 int endcol, xcol, c; 144 145 endcol = win->x_col; 146 xcol = endcol - 1; 147 while (xcol >= 0) { 148 c = readwin(win->x_win, win->x_line, xcol); 149 if (c != ' ') 150 break; 151 xcol--; 152 } 153 while (xcol >= 0) { 154 c = readwin(win->x_win, win->x_line, xcol); 155 if (c == ' ') 156 break; 157 xcol--; 158 } 159 wmove(win->x_win, win->x_line, xcol + 1); 160 for (int i = xcol + 1; i < endcol; i++) 161 waddch(win->x_win, ' '); 162 wmove(win->x_win, win->x_line, xcol + 1); 163 getyx(win->x_win, win->x_line, win->x_col); 164 wrefresh(win->x_win); 165 return; 166 } 167 168 case 025: /* ^U */ 169 kill: 170 wmove(win->x_win, win->x_line, 0); 171 wclrtoeol(win->x_win); 172 getyx(win->x_win, win->x_line, win->x_col); 173 wrefresh(win->x_win); 174 return; 175 176 case L'\f': 177 if (win == &my_win) 178 wrefresh(curscr); 179 return; 180 181 case L'\7': 182 write(STDOUT_FILENO, wc, sizeof(*wc)); 183 return; 184 } 185 186 187 if (iswprint(*wc) || *wc == L'\t') 188 wadd_wch(win->x_win, makecchar(*wc)); 189 else 190 beep(); 191 192 getyx(win->x_win, win->x_line, win->x_col); 193 wrefresh(win->x_win); 194 } 195 196 /* 197 * Read the character at the indicated position in win 198 */ 199 int 200 readwin(WINDOW *win, int line, int col) 201 { 202 int oldline, oldcol; 203 int c; 204 205 getyx(win, oldline, oldcol); 206 wmove(win, line, col); 207 c = winch(win); 208 wmove(win, oldline, oldcol); 209 return (c); 210 } 211