1 /* $OpenBSD: display.c,v 1.18 2016/02/01 07:29:25 mestre Exp $ */ 2 /* $NetBSD: display.c,v 1.3 1994/12/09 02:14:13 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1983, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * The window 'manager', initializes curses and handles the actual 35 * displaying of text 36 */ 37 #include <ctype.h> 38 39 #include "talk.h" 40 41 xwin_t my_win; 42 xwin_t his_win; 43 WINDOW *line_win; 44 45 int curses_initialized; 46 int high_print; 47 bool smooth_scroll; 48 49 /* 50 * max HAS to be a function, it is called with 51 * an argument of the form --foo at least once. 52 */ 53 int 54 max(int a, int b) 55 { 56 57 return (a > b ? a : b); 58 } 59 60 /* 61 * Display some text on somebody's window, processing some control 62 * characters while we are at it. 63 */ 64 void 65 display(xwin_t *win, char *text, int size) 66 { 67 int i; 68 char cch; 69 70 for (i = 0; i < size; i++) { 71 /* 72 * Since we do not use curses's input routines we must 73 * convert '\r' -> '\n' ourselves. 74 */ 75 if (*text == '\r') 76 *text = '\n'; 77 if (*text == '\n') { 78 xscroll(win, 0); 79 text++; 80 continue; 81 } 82 /* erase character */ 83 if (*text == win->cerase) { 84 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 85 getyx(win->x_win, win->x_line, win->x_col); 86 waddch(win->x_win, ' '); 87 wmove(win->x_win, win->x_line, win->x_col); 88 getyx(win->x_win, win->x_line, win->x_col); 89 text++; 90 continue; 91 } 92 /* 93 * On word erase search backwards until we find 94 * the beginning of a word or the beginning of 95 * the line. 96 */ 97 if (*text == win->werase) { 98 int endcol, xcol, i, c; 99 100 endcol = win->x_col; 101 xcol = endcol - 1; 102 while (xcol >= 0) { 103 c = readwin(win->x_win, win->x_line, xcol); 104 if (c != ' ') 105 break; 106 xcol--; 107 } 108 while (xcol >= 0) { 109 c = readwin(win->x_win, win->x_line, xcol); 110 if (c == ' ') 111 break; 112 xcol--; 113 } 114 wmove(win->x_win, win->x_line, xcol + 1); 115 for (i = xcol + 1; i < endcol; i++) 116 waddch(win->x_win, ' '); 117 wmove(win->x_win, win->x_line, xcol + 1); 118 getyx(win->x_win, win->x_line, win->x_col); 119 text++; 120 continue; 121 } 122 /* line kill */ 123 if (*text == win->kill) { 124 wmove(win->x_win, win->x_line, 0); 125 wclrtoeol(win->x_win); 126 getyx(win->x_win, win->x_line, win->x_col); 127 text++; 128 continue; 129 } 130 if (*text == '\f') { 131 if (win == &my_win) 132 wrefresh(curscr); 133 text++; 134 continue; 135 } 136 if (win->x_col == COLS-1) { 137 /* check for wraparound */ 138 xscroll(win, 0); 139 } 140 if (*text != '\t' && 141 ((!high_print && !isprint((unsigned char)*text)) || 142 iscntrl((unsigned char)*text))) { 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, (unsigned char)(*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 int 161 readwin(WINDOW *win, int line, int col) 162 { 163 int oldline, oldcol; 164 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 void 178 xscroll(xwin_t *win, int flag) 179 { 180 181 if (flag == -1) { 182 wmove(win->x_win, 0, 0); 183 win->x_line = 0; 184 win->x_col = 0; 185 return; 186 } 187 win->x_col = 0; 188 if (smooth_scroll) { 189 if (++win->x_line == win->x_nlines) { 190 --win->x_line; 191 scroll(win->x_win); 192 } 193 } else { 194 win->x_line = (win->x_line + 1) % win->x_nlines; 195 wmove(win->x_win, win->x_line, win->x_col); 196 wclrtoeol(win->x_win); 197 wmove(win->x_win, (win->x_line + 1) % win->x_nlines, 198 win->x_col); 199 wclrtoeol(win->x_win); 200 } 201 wmove(win->x_win, win->x_line, win->x_col); 202 } 203