/*
 * Cleaned/adjusted for Linux (Fedora Core 19) by Dr. Peter Bieringer <pb@bieringer.de>
 *
 * Build:
 *  gcc -Wall -fPIC -c getpass_from_stdin.c
 *  gcc -shared -Wl,-soname,getpass_from_stdin.so -o getpass_from_stdin.so getpass_from_stdin.o
 * Usage:
 *  export LD_PRELOAD=<path-to>/getpass_from_stdin.so
 *
 * based on (found at http://www.linuxmisc.com/3-linux/3e9ea6245c8db542.htm)
 ** $ver: getpass_from_stdin.c 1.1 (24.10.2000)
 ** Written by Roland.Ma...@informatik.med.uni-giessen.de
 **
 ** Usage:
 ** cc -c -g -Xc getpass_from_stdin.c -ldl -o getpass_from_stdin.o
 ** export LD_PRELOAD=<abolute_pathname_of_object_file>
 **
 */

#include <stdlib.h>
#include <stdio.h>
#include <limits.h>

#include <unistd.h>

#ifndef PASS_MAX
#define PASS_MAX _SC_PASS_MAX
#endif

#if PASS_MAX > 256
#ifdef __sun
/* confusing: manpage for getpass says PASS_MAX (which is 8)
 * but code uses 9 (=_SC_PASS_MAX)
 */
#define MY_PASS_MAX (_SC_PASS_MAX)
#else
#define MY_PASS_MAX (PASS_MAX)
#endif
#else
#define MY_PASS_MAX (256)
#endif

static char static_buffer[MY_PASS_MAX+2];

static char *getpass_from_stdin( const char *prompt, const int maxlength )
{  
    fprintf( stdout, "%s", prompt );
    fflush( stdout );

    /* be nice to buggy apps. */
    static_buffer[0] = '\0';

    /* both getpass and getpassphrase are mt-unsafe, therefore we can use a static buffer here */

    return( fgets( static_buffer, maxlength+1, stdin ) );
};

char *getpass( const char *prompt )
{
    char *retval;
    retval = getpass_from_stdin( prompt, PASS_MAX );
    return( retval );
};

/* identical to getpass() except it returns up to 256 intead of PASS_MAX */
char *getpassphrase( const char *prompt )
{
    char *retval;
    retval = getpass_from_stdin( prompt, 256 );

    return( retval );
};