do {
if ((c = _getkey ()) == CR) c = LF; /* read character */
if (c == BACKSPACE || c == DEL) { /* process backspace */
if (cnt != 0) {
cnt--; /* decrement count */
line--; /* and line pointer */
putchar (0x08); /* echo backspace */
putchar (' ');
putchar (0x08);
}
}
else if (c != CNTLQ && c != CNTLS) { /* ignore Control S/Q */
putchar (*line = c); /* echo and store character */
line++; /* increment line pointer */
cnt++; /* and count */
}
} while (cnt < n - 1 && c != LF); /* check limit and line feed */
*line = 0; /* mark end of string */
}