OpenWrt – Rev 1

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/*
 * Copyright 1990 - 1995, Julianne Frances Haugh
 * 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. Neither the name of Julianne F. Haugh 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 JULIE HAUGH 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 JULIE HAUGH 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 "t_defines.h"
#ifdef _WIN32
#include <windows.h>
#include <io.h>
#endif /* _WIN32 */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <signal.h>
#include <stdio.h>

static  int     sig_caught;
#ifdef HAVE_SIGACTION
static  struct  sigaction sigact;
#endif

/*ARGSUSED*/
static RETSIGTYPE
sig_catch (sig)
int     sig;
{
        sig_caught = 1;
}

_TYPE( int )
t_getpass (buf, maxlen, prompt)
        char *buf;
        unsigned maxlen;
        const char *prompt;
{
        char    *cp;
#ifdef _WIN32
    HANDLE handle = (HANDLE) _get_osfhandle(_fileno(stdin));
    DWORD  mode;

    GetConsoleMode( handle, &mode );
    SetConsoleMode( handle, mode & ~ENABLE_ECHO_INPUT );

    if(fputs(prompt, stdout) == EOF ||
        fgets(buf, maxlen, stdin) == NULL) {
        SetConsoleMode(handle,mode);
        return -1;
    }
    cp = buf + strlen(buf) - 1;
    if ( *cp == 0x0a )
        *cp = '\0';
    printf("\n");
    SetConsoleMode(handle,mode);
#else
        FILE    *fp;
        int     tty_opened = 0;

#ifdef HAVE_SIGACTION
        struct  sigaction old_sigact;
#else
        RETSIGTYPE      (*old_signal)();
#endif
        TERMIO  new_modes;
        TERMIO  old_modes;

        /*
         * set a flag so the SIGINT signal can be re-sent if it
         * is caught
         */

        sig_caught = 0;

        /*
         * if /dev/tty can't be opened, getpass() needs to read
         * from stdin instead.
         */

        if ((fp = fopen ("/dev/tty", "r")) == 0) {
                fp = stdin;
                setbuf (fp, (char *) 0);
        } else {
                tty_opened = 1;
        }

        /*
         * the current tty modes must be saved so they can be
         * restored later on.  echo will be turned off, except
         * for the newline character (BSD has to punt on this)
         */

        if (GTTY (fileno (fp), &new_modes))
                return -1;

        old_modes = new_modes;

#ifdef HAVE_SIGACTION
        sigact.sa_handler = sig_catch;
        (void) sigaction (SIGINT, &sigact, &old_sigact);
#else
        old_signal = signal (SIGINT, sig_catch);
#endif

#ifdef USE_SGTTY
        new_modes.sg_flags &= ~ECHO;
#else
        new_modes.c_iflag &= ~IGNCR;
        new_modes.c_iflag |= ICRNL;
        new_modes.c_oflag |= OPOST|ONLCR;
        new_modes.c_lflag &= ~(ECHO|ECHOE|ECHOK);
        new_modes.c_lflag |= ICANON|ECHONL;
#endif

        if (STTY (fileno (fp), &new_modes))
                goto out;

        /*
         * the prompt is output, and the response read without
         * echoing.  the trailing newline must be removed.  if
         * the fgets() returns an error, a NULL pointer is
         * returned.
         */

        if (fputs (prompt, stdout) == EOF)
                goto out;

        (void) fflush (stdout);

        if (fgets (buf, maxlen, fp) == buf) {
                if ((cp = strchr (buf, '\n')))
                        *cp = '\0';
                else
                        buf[maxlen - 1] = '\0';

#ifdef USE_SGTTY
                putc ('\n', stdout);
#endif
        }
        else buf[0] = '\0';
out:
        /*
         * the old SIGINT handler is restored after the tty
         * modes.  then /dev/tty is closed if it was opened in
         * the beginning.  finally, if a signal was caught it
         * is sent to this process for normal processing.
         */

        if (STTY (fileno (fp), &old_modes))
        { memset (buf, 0, maxlen); return -1; }

#ifdef HAVE_SIGACTION
        (void) sigaction (SIGINT, &old_sigact, NULL);
#else
        (void) signal (SIGINT, old_signal);
#endif

        if (tty_opened)
                (void) fclose (fp);

        if (sig_caught) {
                kill (getpid (), SIGINT);
                memset (buf, 0, maxlen);
                return -1;
        }
#endif

        return 0;
}