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getpass.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*           Copyright (c) 1985-2007 AT&T Knowledge Ventures            *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                      by AT&T Knowledge Ventures                      *
*                                                                      *
*                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

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