/**************************************************************************************************
	$Header: /pub/cvsroot/yencode/lib/input.c,v 1.2 2002/03/10 16:22:19 bboy Exp $

	Copyright (C) 2002  Don Moore <bboy@bboy.net>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at Your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
**************************************************************************************************/

#include "misc.h"


#ifndef PASS_MAX
#define	PASS_MAX	128
#endif

/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
	PASSINPUT
	Prompts user to input password if it's necessary.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
char *
passinput(const char *prompt)
{
	static char buf[PASS_MAX + 1];
	char			*ptr;
	sigset_t		sig, sigsave;
	struct termios term, termsave;
	FILE			*fp;
	int			c;

	if (!isatty(STDIN_FILENO))
		return (NULL);

	if (!(fp = fopen(ctermid(NULL), "r+")))
		return (NULL);
	setbuf(fp, NULL);

	sigemptyset(&sig);
	sigaddset(&sig, SIGINT);
	sigaddset(&sig, SIGTSTP);
	sigprocmask(SIG_BLOCK, &sig, &sigsave);

	tcgetattr(fileno(fp), &termsave);
	term = termsave;
	term.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
	tcsetattr(fileno(fp), TCSAFLUSH, &term);

	fputs(prompt, fp);

	ptr = buf;
	while ((c = getc(fp)) != EOF && c != '\n')
	{
		if (ptr < &buf[PASS_MAX])
			*ptr++ = c;
	}
	*ptr = 0;
	putc('\n', fp);

	tcsetattr(fileno(fp), TCSAFLUSH, &termsave);
	sigprocmask(SIG_SETMASK, &sigsave, NULL);
	fclose(fp);
	return (buf);
}
/*--- passinput() -------------------------------------------------------------------------------*/

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