curses_demo.c

#include <stdlib.h>
#include <curses.h>

int r, c,  // current row and column (upper-left is (0,0))
  nrows,  // number of rows in window
  ncols;  // number of columns in window

void draw(char dc)
{
  move(r, c);  // curses call to move cursor to row r, column c

  // curses calls to replace character under cursor by dc
  delch();
  insch(dc);

  refresh();  // curses call to update screen
  r++;  // go to next row
  // check for need to shift right or wrap around
  if (r == nrows) {
    r = 0;
    c++;
    if (c == ncols) c = 0;
  }
}

int main(int argc, char** argv)
{
  int i;
  char d;
  WINDOW* wnd;

  wnd = initscr();  // curses call to initialize window
  cbreak();  // curses call to set no waiting for Enter key
  noecho();  // curses call to set no echoing
  getmaxyx(wnd, nrows, ncols);  // curses call to find size of window
  clear();  // curses call to clear screen, send cursor to position (0, 0)
  refresh();  // curses call to implement all changes since last refresh

  r = c = 0;
  while (1) {
    d = getch();  // curses call to input from keyboard
    if (d == 'q') break;  // quit?
    draw(d);  // draw the character
  }

  endwin();  // curses call to restore the original window and leave
  return EXIT_SUCCESS;
}