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input.c

/**************************************************************************************************
      $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() -------------------------------------------------------------------------------*/

/* vi:set ts=3: */

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