/* compat.h: various compatibility bits
   Copyright (c) 2003-2012 Philip Kendall
   Copyright (c) 2015 Stuart Brady
   Copyright (c) 2015 Sergio Baldoví

   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.,
   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

   Author contact information:

   E-mail: philip-fuse@shadowmagic.org.uk

*/

#ifndef FUSE_COMPAT_H
#define FUSE_COMPAT_H

#include <stdio.h>
#include <dirent.h>
#include <stdlib.h>
#include <sys/types.h>

#ifdef WIN32
#include <winsock2.h>
#endif

/* Remove the gcc-specific incantations if we're not using gcc */
#ifdef __GNUC__

#define GCC_UNUSED __attribute__ ((unused))
#define GCC_PRINTF( fmtstring, args ) __attribute__ ((format( printf, fmtstring, args )))
#define GCC_NORETURN __attribute__ ((noreturn))

#else				/* #ifdef __GNUC__ */

#define GCC_UNUSED
#define GCC_PRINTF( fmtstring, args )
#define GCC_NORETURN

#endif				/* #ifdef __GNUC__ */

#if defined(__GNUC__) && defined(__GNUC_MINOR__)
  #define GNUC_VERSION \
    (__GNUC__ << 16) + __GNUC_MINOR__
  #define GNUC_PREREQ(maj, min) \
    (GNUC_VERSION >= ((maj) << 16) + (min))
#else
  #define GNUC_PREREQ(maj, min) 0
#endif

#define BUILD_BUG_ON_ZERO(e) \
  (sizeof(struct { int:-!!(e) * 1234; }))

#if !GNUC_PREREQ(3, 1) || defined( __STRICT_ANSI__ )
  #define MUST_BE_ARRAY(a) \
    BUILD_BUG_ON_ZERO(sizeof(a) % sizeof(*a))
#else
  #define SAME_TYPE(a, b) \
    __builtin_types_compatible_p(typeof(a), typeof(b))
  #define MUST_BE_ARRAY(a) \
    BUILD_BUG_ON_ZERO(SAME_TYPE((a), &(*a)))
#endif

#define ARRAY_SIZE(a) ( \
  (sizeof(a) / sizeof(*a)) \
   + MUST_BE_ARRAY(a))

#ifndef HAVE_DIRNAME
char *dirname( char *path );
#endif				/* #ifndef HAVE_DIRNAME */

#if !defined HAVE_GETOPT_LONG && !defined AMIGA && !defined __MORPHOS__
#include "compat/getopt.h"
#endif				/* #ifndef HAVE_GETOPT_LONG */

#ifndef HAVE_MKSTEMP
int mkstemp( char *templ );
#endif				/* #ifndef HAVE_MKSTEMP */

/* That which separates components in a path name */
#ifdef WIN32
#define FUSE_DIR_SEP_CHR '\\'
#define FUSE_DIR_SEP_STR "\\"
#else
#define FUSE_DIR_SEP_CHR '/'
#define FUSE_DIR_SEP_STR "/"
#endif

/* End of line for text files */
#ifdef WIN32
#define FUSE_EOL "\r\n"
#else
#define FUSE_EOL "\n"
#endif

#ifndef PATH_MAX
#define PATH_MAX 1024
#endif

/* The types of auxiliary file we can look for */
typedef enum utils_aux_type {

  UTILS_AUXILIARY_LIB,		/* Something from the lib/ directory */
  UTILS_AUXILIARY_ROM,		/* Something from the roms/ directory */
  UTILS_AUXILIARY_WIDGET,	/* Something from the widget/ directory */
  UTILS_AUXILIARY_GTK,		/* Something from the gtk/ directory */

} utils_aux_type;

typedef struct path_context {

  int state;

  utils_aux_type type;
  char path[ PATH_MAX ];

} path_context;

int compat_osname( char *buffer, size_t length );
const char* compat_get_temp_path( void );
const char* compat_get_config_path( void );
int compat_is_absolute_path( const char *path );
int compat_get_next_path( path_context *ctx );

typedef FILE* compat_fd;

#ifndef GEKKO
typedef DIR* compat_dir;
#else                           /* #ifndef GEKKO */
typedef DIR_ITER* compat_dir;
#endif                          /* #ifndef GEKKO */

extern const compat_fd COMPAT_FILE_OPEN_FAILED;

/* File handling */

struct utils_file;

compat_fd compat_file_open( const char *path, int write );
off_t compat_file_get_length( compat_fd fd );
int compat_file_read( compat_fd fd, struct utils_file *file );
int compat_file_write( compat_fd fd, const unsigned char *buffer,
                       size_t length );
int compat_file_close( compat_fd fd );
int compat_file_exists( const char *path );

/* Directory handling */

typedef enum compat_dir_result_t {
  COMPAT_DIR_RESULT_OK,
  COMPAT_DIR_RESULT_END,
  COMPAT_DIR_RESULT_ERROR,
} compat_dir_result_t;

compat_dir compat_opendir( const char *path );
compat_dir_result_t compat_readdir( compat_dir directory, char *name,
				    size_t length );
int compat_closedir( compat_dir directory );

/* Timing routines */

double compat_timer_get_time( void );
void compat_timer_sleep( int ms );

/* TUN/TAP handling */

int compat_get_tap( const char *interface_name );

/* Socket handling */

#ifndef WIN32
typedef int compat_socket_t;
#else                           /* #ifndef WIN32 */
typedef SOCKET compat_socket_t;
#endif

extern const compat_socket_t compat_socket_invalid;
extern const int compat_socket_EBADF;

void compat_socket_networking_init( void );
void compat_socket_networking_end( void );

int compat_socket_close( compat_socket_t fd );
int compat_socket_get_error( void );
const char *compat_socket_get_strerror( void );

typedef struct compat_socket_selfpipe_t compat_socket_selfpipe_t;

compat_socket_selfpipe_t* compat_socket_selfpipe_alloc( void );
void compat_socket_selfpipe_free( compat_socket_selfpipe_t *self );
compat_socket_t compat_socket_selfpipe_get_read_fd( compat_socket_selfpipe_t *self );
void compat_socket_selfpipe_wake( compat_socket_selfpipe_t *self );
void compat_socket_selfpipe_discard_data( compat_socket_selfpipe_t *self );

#endif				/* #ifndef FUSE_COMPAT_H */