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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libcodex/codexgetpass.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 2003-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                   Phong Vo <[email protected]>                    *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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/*

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 * prompt for password and return it in buf

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 * return <  0 : error

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 * return >= n : n-1 in buf, nul terminated

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 */

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#include <codex.h>

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#include <sig.h>

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#include <ast_tty.h>

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ssize_t

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codexgetpass(const char* prompt, void* buf, size_t n)

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{

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	char*		s;

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	long		flags;

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	ssize_t		r;

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	Sfio_t*		rp;

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	Sfio_t*		wp;

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	Sig_handler_t	sigint;

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	struct termios	tty;

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	if (rp = sfopen(NiL, "/dev/tty", "r+"))

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		wp = rp;

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	else

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	{

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		rp = sfstdin;

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		wp = sfstderr;

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	}

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	sigint = signal(SIGINT, SIG_IGN);

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	tcgetattr(sffileno(rp), &tty);

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	flags = tty.c_lflag;

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	tty.c_lflag &= ~(ECHO|ECHONL);

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	tcsetattr(sffileno(rp), TCSANOW, &tty);

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	tty.c_lflag = flags;

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	if (prompt)

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	{

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		sfprintf(wp, "%s", prompt);

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		sfsync(wp);

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	}

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	if (s = sfgetr(rp, '\n', 1))

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		r = strncopy((char*)buf, s, n) - (char*)buf;

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	else

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		r = -1;

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	sfprintf(wp, "\n");

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	sfsync(wp);

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	tcsetattr(sffileno(rp), TCSANOW, &tty);

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	signal(SIGINT, sigint);

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	if (rp == wp)

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		sfclose(rp);

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	return r;

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}

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