date and time created 84/04/11 15:02:48 by karels

SCCS-vsn: usr.bin/talk/display.c 1.1

diff --git a/usr/src/usr.bin/talk/display.c b/usr/src/usr.bin/talk/display.c
new file mode 100644 (file)
index 0000000..22615a0
--- /dev/null
+++ b/usr/src/usr.bin/talk/display.c
@@ -0,0 +1,170 @@
+/* $Header: display.c 1.2 83/04/23 02:09:33 moore Exp $ */
+
+/* The window 'manager', initializes curses and handles the actual
+ * displaying of text
+ */
+
+#include "talk.h"
+
+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
+     * a argument of the form --foo at least once.
+     */
+
+max(a,b)
+int a, b;
+{
+    if (a > b) {
+       return(a);
+    } else {
+       return(b);
+    }
+}
+
+/*
+ * Display some text on somebody's window, processing some control
+ * characters while we are at it.
+ */
+
+display(win, text, size)
+register xwin_t *win;
+register char *text;
+int size;
+{
+    register int i;
+    char cch;
+
+    for (i = 0; i < size; i++) {
+
+       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);
+           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 < ' ' && *text != '\t') {
+           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, *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
+*/
+readwin(win, line, col)
+WINDOW *win;
+{
+int oldline, oldcol;
+register 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
+*/
+
+xscroll(win, flag)
+register 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_line = (win->x_line + 1) % win->x_nlines;
+    win->x_col = 0;
+    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);
+}