#ifndef EMACS_W32_H
#define EMACS_W32_H

/* Support routines for the NT version of Emacs.
   Copyright (C) 1994, 2001-2021 Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs 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 3 of the License, or (at
your option) any later version.

GNU Emacs 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 GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */

#ifdef CYGWIN
#error "w32.h is not compatible with Cygwin"
#endif

#include <windows.h>


/* File descriptor set emulation.  */

/* MSVC runtime library has limit of 64 descriptors by default */
#define FD_SETSIZE  64
typedef struct {
  unsigned int bits[FD_SETSIZE / 32];
} fd_set;

/* standard access macros */
#define FD_SET(n, p) \
  do { \
    if ((n) < FD_SETSIZE) { \
      (p)->bits[(n)/32] |= (1 << (n)%32); \
    } \
  } while (0)
#define FD_CLR(n, p) \
  do { \
    if ((n) < FD_SETSIZE) { \
      (p)->bits[(n)/32] &= ~(1 << (n)%32); \
    } \
  } while (0)
#define FD_ISSET(n, p) ((n) < FD_SETSIZE ? ((p)->bits[(n)/32] & (1 << (n)%32)) : 0)
#define FD_ZERO(p) memset((p), 0, sizeof(fd_set))

#define SELECT_TYPE fd_set

/* ------------------------------------------------------------------------- */

/* child_process.status values */
enum {
  STATUS_READ_ERROR = -1,
  STATUS_READ_READY,
  STATUS_READ_IN_PROGRESS,
  STATUS_READ_FAILED,
  STATUS_READ_SUCCEEDED,
  STATUS_READ_ACKNOWLEDGED,
  STATUS_CONNECT_FAILED
};

/* This structure is used for both pipes and sockets; for
   a socket, the process handle in pi is NULL. */
typedef struct _child_process
{
  /* File descriptor for sockets and serial port connections, and for
     reading output from async subprocesses; otherwise -1.  */
  int                 fd;
  /* PID for subprocess, either async or not; otherwise -1.  */
  int                 pid;
  /* Handle to an event object that is signaled when a read operation
     is completed, either successfully (in which case there're indeed
     "characters available") or not.  Used by sys_select to wait for
     output from subprocesses or socket/serial connections.  */
  HANDLE              char_avail;
  /* Handle to an event that is signaled to wake up the reader thread
     and tell it to try reading more output from a subprocess.  */
  HANDLE              char_consumed;
  /* Handle to the reader thread to read output from a subprocess or a
     socket or a comm port.  */
  HANDLE              thrd;
  /* Handle to the console window of a subprocess.  Used to forcibly
     terminate it by sys_kill.  */
  HWND                hwnd;
  /* Information about subprocess returned by CreateProcess.  Includes
     handles to the subprocess and its main thread, and the
     corresponding process ID and thread ID numbers.  The PID is
     mirrored by the 'pid' member above.  The process handle is used
     to wait on it.  */
  PROCESS_INFORMATION procinfo;
  /* Status of subprocess/connection and of reading its output.  For
     values, see the enumeration above.  */
  volatile int        status;
  /* Used to store errno value of failed async 'connect' calls.  */
  volatile int        errcode;
  /* Holds a single character read by _sys_read_ahead, when a
     subprocess has some output ready.  */
  char                chr;
  /* Used for async read operations on serial comm ports.  */
  OVERLAPPED          ovl_read;
  /* Used for async write operations on serial comm ports.  */
  OVERLAPPED          ovl_write;
} child_process;

#define MAXDESC FD_SETSIZE
#define MAX_CHILDREN  MAXDESC/2
#define CHILD_ACTIVE(cp) ((cp)->char_avail != NULL)

/* parallel array of private info on file handles */
typedef struct
{
  unsigned         flags;
  HANDLE           hnd;
  child_process *  cp;
} filedesc;

extern filedesc fd_info [ MAXDESC ];

/* fd_info flag definitions */
#define FILE_READ               0x0001
#define FILE_WRITE              0x0002
#define FILE_LISTEN             0x0004
#define FILE_CONNECT            0x0008
#define FILE_BINARY             0x0010
#define FILE_LAST_CR            0x0020
#define FILE_AT_EOF             0x0040
#define FILE_SEND_SIGCHLD       0x0080
#define FILE_PIPE               0x0100
#define FILE_SOCKET             0x0200
#define FILE_NDELAY             0x0400
#define FILE_SERIAL             0x0800
#define FILE_DONT_CLOSE         0x1000

extern child_process * new_child (void);
extern void delete_child (child_process *cp);

/* ------------------------------------------------------------------------- */

/* Equivalent of strerror for W32 error codes.  */
extern char * w32_strerror (int error_no);

/* Validate a pointer.  */
extern int w32_valid_pointer_p (void *, int);

/* Get long (aka "true") form of file name, if it exists.  */
extern BOOL w32_get_long_filename (const char * name, char * buf, int size);

/* Get the short (a.k.a. "8+3") form of a file name.  */
extern unsigned int w32_get_short_filename (const char *, char *, int);

/* Prepare our standard handles for proper inheritance by child processes.  */
extern void prepare_standard_handles (int in, int out,
				      int err, HANDLE handles[3]);

/* Reset our standard handles to their original state.  */
extern void reset_standard_handles (int in, int out,
				    int err, HANDLE handles[3]);

/* Query Windows Registry and return the resource associated
   associated with KEY and NAME of type TYPE.  */
extern LPBYTE w32_get_resource (const char * key, const char * name, LPDWORD type);

extern void release_listen_threads (void);
extern void init_ntproc (int);
extern void term_ntproc (int);
extern HANDLE maybe_load_unicows_dll (void);
extern void globals_of_w32 (void);

extern void term_timers (void);
extern void init_timers (void);

extern int _sys_read_ahead (int fd);
extern int _sys_wait_accept (int fd);
extern int _sys_wait_connect (int fd);

extern HMODULE w32_delayed_load (Lisp_Object);

typedef int (WINAPI *MultiByteToWideChar_Proc)(UINT,DWORD,LPCSTR,int,LPWSTR,int);
typedef int (WINAPI *WideCharToMultiByte_Proc)(UINT,DWORD,LPCWSTR,int,LPSTR,int,LPCSTR,LPBOOL);
extern MultiByteToWideChar_Proc pMultiByteToWideChar;
extern WideCharToMultiByte_Proc pWideCharToMultiByte;
extern DWORD multiByteToWideCharFlags;

extern char *w32_my_exename (void);
extern const char *w32_relocate (const char *);
extern char *realpath (const char *, char *);

extern void init_environment (char **);
extern void check_windows_init_file (void);
extern void syms_of_ntproc (void);
extern void syms_of_ntterm (void);
extern void dostounix_filename (register char *);
extern void unixtodos_filename (register char *);
extern const char *map_w32_filename (const char *, const char **);
extern int  filename_from_ansi (const char *, char *);
extern int  filename_to_ansi (const char *, char *);
extern int  filename_from_utf16 (const wchar_t *, char *);
extern int  filename_to_utf16 (const char *, wchar_t *);
extern Lisp_Object w32_get_internal_run_time (void);
extern void w32_init_file_name_codepage (void);
extern int  codepage_for_filenames (CPINFO *);
extern Lisp_Object ansi_encode_filename (Lisp_Object);
extern int  w32_copy_file (const char *, const char *, int, int, int);
extern int  w32_accessible_directory_p (const char *, ptrdiff_t);
extern void w32_init_current_directory (void);

extern BOOL init_winsock (int load_now);
extern void srandom (int);
extern int random (void);

extern int fchmod (int, mode_t);
extern int sys_rename_replace (char const *, char const *, BOOL);
extern int pipe2 (int *, int);
extern void register_aux_fd (int);

extern void set_process_dir (const char *);
extern int sys_spawnve (int, char *, char **, char **);
extern void register_child (pid_t, int);

extern void sys_sleep (int);
extern int sys_link (const char *, const char *);
extern int openat (int, const char *, int, int);
extern int fchmodat (int, char const *, mode_t, int);
extern int lchmod (char const *, mode_t);

/* Return total and free memory info.  */
extern int w32_memory_info (unsigned long long *, unsigned long long *,
			    unsigned long long *, unsigned long long *);

/* Compare 2 UTF-8 strings in locale-dependent fashion.  */
extern int w32_compare_strings (const char *, const char *, char *, int);

/* Return the number of processor execution units on this system.  */
extern unsigned w32_get_nproc (void);

/* Return a cryptographically secure seed for PRNG.  */
extern int w32_init_random (void *, ptrdiff_t);

extern Lisp_Object w32_read_registry (HKEY, Lisp_Object, Lisp_Object);

#ifdef HAVE_GNUTLS
#include <gnutls/gnutls.h>

/* GnuTLS pull (read from remote) interface.  */
extern ssize_t emacs_gnutls_pull (gnutls_transport_ptr_t p,
                                  void* buf, size_t sz);

/* GnuTLS push (write to remote) interface.  */
extern ssize_t emacs_gnutls_push (gnutls_transport_ptr_t p,
                                  const void* buf, size_t sz);
#endif /* HAVE_GNUTLS */

#endif /* EMACS_W32_H */