getpass.c   [plain text]

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2007 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#include "FEATURE/uwin"

#if !_UWIN || _lib_getpass

void _STUB_getpass(){}

#else

#pragma prototyped

#define getpass	______getpass

#include	<ast.h>
#include	<termios.h>
#include	<signal.h>

#undef	getpass

#if defined(__EXPORT__)
#define extern		__EXPORT__
#endif

static int interrupt;
static void handler(int sig)
{
	interrupt++;
}

extern char*	getpass(const char *prompt)
{
	struct termios told,tnew;
	Sfio_t *iop;
	static char *cp, passwd[32];
	void (*savesig)(int);
	if(!(iop = sfopen((Sfio_t*)0, "/dev/tty", "r")))
		return(0);
	if(tcgetattr(sffileno(iop),&told) < 0)
		return(0);
	interrupt = 0;
	tnew = told;
	tnew.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL);
	if(tcsetattr(sffileno(iop),TCSANOW,&tnew) < 0)
		return(0);
	savesig = signal(SIGINT, handler);
	sfputr(sfstderr,prompt,-1);
	if(cp = sfgetr(iop,'\n',1))
		strncpy(passwd,cp,sizeof(passwd)-1);
	tcsetattr(sffileno(iop),TCSANOW,&told);
	sfputc(sfstderr,'\n');
	sfclose(iop);
	signal(SIGINT, savesig);
	if(interrupt)
		kill(getpid(),SIGINT);
	return(cp?passwd:0);
}


#endif