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Use an ISC-tyle license for all my code; it is simpler and more permissive.

/*	$OpenBSD: readpassphrase.h,v 1.4 2003/06/03 01:52:39 millert Exp $	*/

/*
 * Copyright (c) 2000 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef _READPASSPHRASE_H_
#define _READPASSPHRASE_H_

#define RPP_ECHO_OFF    0x00		/* Turn off echo (default). */
#define RPP_ECHO_ON     0x01		/* Leave echo on. */
#define RPP_REQUIRE_TTY 0x02		/* Fail if there is no tty. */
#define RPP_FORCELOWER  0x04		/* Force input to lower case. */
#define RPP_FORCEUPPER  0x08		/* Force input to upper case. */
#define RPP_SEVENBIT    0x10		/* Strip the high bit from input. */
#define RPP_STDIN       0x20		/* Read from stdin, not /dev/tty */

#include <sys/cdefs.h>

__BEGIN_DECLS
char * readpassphrase(const char *, char *, size_t, int);
__END_DECLS

#endif /* !_READPASSPHRASE_H_ */