text: /* getpass.c -- read a password without echo.
   *
   * Portions of this code are Copyright (c) 1988, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Berkeley and its contributors.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include "h/mh.h"
  #include "getpass.h"
  #include <termios.h>
  
  /* We don't use MAX_PASS here because the maximum password length on a remote
     POP daemon will have nothing to do with the length on our OS.  256 is
     arbitrary but hopefully big enough to accommodate everyone. */
  #define MAX_PASSWORD_LEN 256
  
  #ifndef TCSANOW
  #define TCSANOW 0
  #endif
  
  char *
  nmh_getpass(const char *prompt)
  {
    struct termios oterm, term;
    int ch;
    char *p;
    FILE *fout, *fin;
    static char  buf[MAX_PASSWORD_LEN + 1];
    int istty = isatty(fileno(stdin));
  
    /* Find if stdin is connect to a terminal. If so, read directly from
     * the terminal, and turn off echo. Otherwise read from stdin.
     */
  
    if (!istty || !(fout = fin = fopen("/dev/tty", "w+"))) {
      fout = stderr;
      fin = stdin;
    }
    else /* Reading directly from terminal here */
      {
        (void)tcgetattr(fileno(fin), &oterm);
        term = oterm; /* Save original info */
        term.c_lflag &= ~ECHO;
        (void)fputs(prompt, fout);
        rewind(fout);			/* implied flush */
        (void)tcsetattr(fileno(fin), TCSANOW, &term);
      }
  
    for (p = buf; (ch = getc(fin)) != EOF &&
                   ch != '\n' &&
  	         p < buf + MAX_PASSWORD_LEN;)
      *p++ = ch;
    *p = '\0';
  
    if (istty && fin != stdin) {
      (void)tcsetattr(fileno(fin), TCSANOW, &oterm);
      rewind(fout);
      (void)fputc('\n', fout);
      (void)fclose(fin);
    }
    return buf;
  }
  