/* misc.c
 * Copyright (C) 1999, 2001, 2002, 2003, 2007,
 *               2008 Free Software Foundation, Inc.
 *
 * This file is part of Libgcrypt.
 *
 * Libgcrypt is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * Libgcrypt 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>

#include "g10lib.h"
#include "secmem.h"

static int verbosity_level = 0;

static void (*fatal_error_handler)(void*,int, const char*) = NULL;
static void *fatal_error_handler_value = 0;
static void (*log_handler)(void*,int, const char*, va_list) = NULL;
static void *log_handler_value = 0;

static const char *(*user_gettext_handler)( const char * ) = NULL;

void
gcry_set_gettext_handler( const char *(*f)(const char*) )
{
    user_gettext_handler = f;
}


const char *
_gcry_gettext( const char *key )
{
    if( user_gettext_handler )
	return user_gettext_handler( key );
    /* FIXME: switch the domain to gnupg and restore later */
    return key;
}

void
gcry_set_fatalerror_handler( void (*fnc)(void*,int, const char*), void *value)
{
    fatal_error_handler_value = value;
    fatal_error_handler = fnc;
}

static void
write2stderr( const char *s )
{
  /* Dummy variable to silence gcc warning.  */
  int res = write( 2, s, strlen(s) );
  (void) res;
}

/*
 * This function is called for fatal errors.  A caller might want to
 * set his own handler because this function simply calls abort().
 */
void
_gcry_fatal_error (int rc, const char *text)
{
  if ( !text ) /* get a default text */
    text = gpg_strerror (rc);

  if (fatal_error_handler && !fips_mode () )
    fatal_error_handler (fatal_error_handler_value, rc, text);

  fips_signal_fatal_error (text);
  write2stderr("\nFatal error: ");
  write2stderr(text);
  write2stderr("\n");
  _gcry_secmem_term ();
  abort ();
}

void
gcry_set_log_handler( void (*f)(void*,int, const char*, va_list ),
							    void *opaque )
{
    log_handler = f;
    log_handler_value = opaque;
}

void
_gcry_set_log_verbosity( int level )
{
    verbosity_level = level;
}

int
_gcry_log_verbosity( int level )
{
    return verbosity_level >= level;
}

/****************
 * This is our log function which prints all log messages to stderr or
 * using the function defined with gcry_set_log_handler().
 */
static void
_gcry_logv( int level, const char *fmt, va_list arg_ptr )
{
  if (log_handler)
    log_handler (log_handler_value, level, fmt, arg_ptr);
  else
    {
      switch (level)
        {
        case GCRY_LOG_CONT:  break;
        case GCRY_LOG_INFO:  break;
        case GCRY_LOG_WARN:  break;
        case GCRY_LOG_ERROR: break;
        case GCRY_LOG_FATAL: fputs("Fatal: ",stderr ); break;
        case GCRY_LOG_BUG:   fputs("Ohhhh jeeee: ", stderr); break;
        case GCRY_LOG_DEBUG: fputs("DBG: ", stderr ); break;
        default: fprintf(stderr,"[Unknown log level %d]: ", level ); break;
	}
      vfprintf(stderr,fmt,arg_ptr) ;
    }

  if ( level == GCRY_LOG_FATAL || level == GCRY_LOG_BUG )
    {
      fips_signal_fatal_error ("internal error (fatal or bug)");
      _gcry_secmem_term ();
      abort ();
    }
}


void
_gcry_log( int level, const char *fmt, ... )
{
    va_list arg_ptr ;

    va_start( arg_ptr, fmt ) ;
    _gcry_logv( level, fmt, arg_ptr );
    va_end(arg_ptr);
}


#if defined(JNLIB_GCC_M_FUNCTION) || __STDC_VERSION__ >= 199901L
void
_gcry_bug( const char *file, int line, const char *func )
{
    _gcry_log( GCRY_LOG_BUG,
	     ("... this is a bug (%s:%d:%s)\n"), file, line, func );
    abort(); /* never called, but it makes the compiler happy */
}
void
_gcry_assert_failed (const char *expr, const char *file, int line,
                     const char *func)
{
  _gcry_log (GCRY_LOG_BUG,
             ("Assertion `%s' failed (%s:%d:%s)\n"), expr, file, line, func );
  abort(); /* Never called, but it makes the compiler happy. */
}
#else
void
_gcry_bug( const char *file, int line )
{
    _gcry_log( GCRY_LOG_BUG,
	     _("you found a bug ... (%s:%d)\n"), file, line);
    abort(); /* never called, but it makes the compiler happy */
}
void
_gcry_assert_failed (const char *expr, const char *file, int line)
{
  _gcry_log (GCRY_LOG_BUG,
             ("Assertion `%s' failed (%s:%d)\n"), expr, file, line);
  abort(); /* Never called, but it makes the compiler happy. */
}
#endif

void
_gcry_log_info( const char *fmt, ... )
{
    va_list arg_ptr ;

    va_start( arg_ptr, fmt ) ;
    _gcry_logv( GCRY_LOG_INFO, fmt, arg_ptr );
    va_end(arg_ptr);
}

int
_gcry_log_info_with_dummy_fp (FILE *fp, const char *fmt, ... )
{
    va_list arg_ptr;

    (void)fp;
    va_start( arg_ptr, fmt ) ;
    _gcry_logv( GCRY_LOG_INFO, fmt, arg_ptr );
    va_end(arg_ptr);
    return 0;
}

void
_gcry_log_error( const char *fmt, ... )
{
    va_list arg_ptr ;

    va_start( arg_ptr, fmt ) ;
    _gcry_logv( GCRY_LOG_ERROR, fmt, arg_ptr );
    va_end(arg_ptr);
}


void
_gcry_log_fatal( const char *fmt, ... )
{
    va_list arg_ptr ;

    va_start( arg_ptr, fmt ) ;
    _gcry_logv( GCRY_LOG_FATAL, fmt, arg_ptr );
    va_end(arg_ptr);
    abort(); /* never called, but it makes the compiler happy */
}

void
_gcry_log_bug( const char *fmt, ... )
{
    va_list arg_ptr ;

    va_start( arg_ptr, fmt ) ;
    _gcry_logv( GCRY_LOG_BUG, fmt, arg_ptr );
    va_end(arg_ptr);
    abort(); /* never called, but it makes the compiler happy */
}

void
_gcry_log_debug( const char *fmt, ... )
{
    va_list arg_ptr ;

    va_start( arg_ptr, fmt ) ;
    _gcry_logv( GCRY_LOG_DEBUG, fmt, arg_ptr );
    va_end(arg_ptr);
}


void
_gcry_log_printf (const char *fmt, ...)
{
  va_list arg_ptr;

  if (fmt)
    {
      va_start( arg_ptr, fmt ) ;
      _gcry_logv (GCRY_LOG_CONT, fmt, arg_ptr);
      va_end(arg_ptr);
    }
}

/* Print a hexdump of BUFFER.  With TEXT of NULL print just the raw
   dump, with TEXT an empty string, print a trailing linefeed,
   otherwise print an entire debug line. */
void
_gcry_log_printhex (const char *text, const void *buffer, size_t length)
{
  if (text && *text)
    log_debug ("%s ", text);
  if (length)
    {
      const unsigned char *p = buffer;
      log_printf ("%02X", *p);
      for (length--, p++; length--; p++)
        log_printf (" %02X", *p);
    }
  if (text)
    log_printf ("\n");
}


void
_gcry_burn_stack (int bytes)
{
    char buf[64];

    wipememory (buf, sizeof buf);
    bytes -= sizeof buf;
    if (bytes > 0)
        _gcry_burn_stack (bytes);
}

void
_gcry_divide_by_zero (void)
{
    gpg_err_set_errno (EDOM);
    _gcry_fatal_error (gpg_err_code_from_errno (errno), "divide by zero");
}