#include	"call.h"/* * Called when first character of a line is the escape character * (tilde).  Read the next character and process.  Return -1 * if next character is "terminate" character, 0 if next character * is valid command character (that's been processed), or next * character itself (if the next character is not special). */intdoescape(int remfd){	char	c;	if (read(STDIN_FILENO, &c, 1) != 1)		/* next input char */		err_sys("read error from stdin");	if (c == escapec) {		/* two in a row -> process as one */		return(escapec);	} else if (c == '.') {	/* terminate */		write(STDOUT_FILENO, "~.\n\r", 4);		return(-1);#ifdef	VSUSP	} else if (c == tty_termios()->c_cc[VSUSP]) { /* suspend client */		tty_reset(STDIN_FILENO);	/* restore tty mode */		kill(getpid(), SIGTSTP);	/* suspend ourself */		tty_raw(STDIN_FILENO);		/* and reset tty to raw */		return(0);#endif	} else if (c == '#') {	/* generate break */		tcsendbreak(remfd, 0);		return(0);	} else if (c == 't') {	/* take a file from remote host */		take(remfd);		return(0);	} else if (c == 'p') {	/* put a file to remote host */		put(remfd);		return(0);	}	return(c);			/* not a special character */}