1 /*- 2 * Copyright (c) 1983, 1985 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)display.c 5.1 (Berkeley) 6/6/85"; 10 #endif not lint 11 12 /* 13 * The window 'manager', initializes curses and handles the actual 14 * displaying of text 15 */ 16 #include "talk.h" 17 18 xwin_t my_win; 19 xwin_t his_win; 20 WINDOW *line_win; 21 22 int curses_initialized = 0; 23 24 /* 25 * max HAS to be a function, it is called with 26 * a argument of the form --foo at least once. 27 */ 28 max(a,b) 29 int a, b; 30 { 31 32 return (a > b ? a : b); 33 } 34 35 /* 36 * Display some text on somebody's window, processing some control 37 * characters while we are at it. 38 */ 39 display(win, text, size) 40 register xwin_t *win; 41 register char *text; 42 int size; 43 { 44 register int i; 45 char cch; 46 47 for (i = 0; i < size; i++) { 48 if (*text == '\n') { 49 xscroll(win, 0); 50 text++; 51 continue; 52 } 53 /* erase character */ 54 if (*text == win->cerase) { 55 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 56 getyx(win->x_win, win->x_line, win->x_col); 57 waddch(win->x_win, ' '); 58 wmove(win->x_win, win->x_line, win->x_col); 59 getyx(win->x_win, win->x_line, win->x_col); 60 text++; 61 continue; 62 } 63 /* 64 * On word erase search backwards until we find 65 * the beginning of a word or the beginning of 66 * the line. 67 */ 68 if (*text == win->werase) { 69 int endcol, xcol, i, c; 70 71 endcol = win->x_col; 72 xcol = endcol - 1; 73 while (xcol >= 0) { 74 c = readwin(win->x_win, win->x_line, xcol); 75 if (c != ' ') 76 break; 77 xcol--; 78 } 79 while (xcol >= 0) { 80 c = readwin(win->x_win, win->x_line, xcol); 81 if (c == ' ') 82 break; 83 xcol--; 84 } 85 wmove(win->x_win, win->x_line, xcol + 1); 86 for (i = xcol + 1; i < endcol; i++) 87 waddch(win->x_win, ' '); 88 wmove(win->x_win, win->x_line, xcol + 1); 89 getyx(win->x_win, win->x_line, win->x_col); 90 continue; 91 } 92 /* line kill */ 93 if (*text == win->kill) { 94 wmove(win->x_win, win->x_line, 0); 95 wclrtoeol(win->x_win); 96 getyx(win->x_win, win->x_line, win->x_col); 97 text++; 98 continue; 99 } 100 if (*text == '\f') { 101 if (win == &my_win) 102 wrefresh(curscr); 103 text++; 104 continue; 105 } 106 if (win->x_col == COLS-1) { 107 /* check for wraparound */ 108 xscroll(win, 0); 109 } 110 if (*text < ' ' && *text != '\t') { 111 waddch(win->x_win, '^'); 112 getyx(win->x_win, win->x_line, win->x_col); 113 if (win->x_col == COLS-1) /* check for wraparound */ 114 xscroll(win, 0); 115 cch = (*text & 63) + 64; 116 waddch(win->x_win, cch); 117 } else 118 waddch(win->x_win, *text); 119 getyx(win->x_win, win->x_line, win->x_col); 120 text++; 121 } 122 wrefresh(win->x_win); 123 } 124 125 /* 126 * Read the character at the indicated position in win 127 */ 128 readwin(win, line, col) 129 WINDOW *win; 130 { 131 int oldline, oldcol; 132 register int c; 133 134 getyx(win, oldline, oldcol); 135 wmove(win, line, col); 136 c = winch(win); 137 wmove(win, oldline, oldcol); 138 return (c); 139 } 140 141 /* 142 * Scroll a window, blanking out the line following the current line 143 * so that the current position is obvious 144 */ 145 xscroll(win, flag) 146 register xwin_t *win; 147 int flag; 148 { 149 150 if (flag == -1) { 151 wmove(win->x_win, 0, 0); 152 win->x_line = 0; 153 win->x_col = 0; 154 return; 155 } 156 win->x_line = (win->x_line + 1) % win->x_nlines; 157 win->x_col = 0; 158 wmove(win->x_win, win->x_line, win->x_col); 159 wclrtoeol(win->x_win); 160 wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col); 161 wclrtoeol(win->x_win); 162 wmove(win->x_win, win->x_line, win->x_col); 163 } 164