newlib-cygwin/newlib/libc/include/sys/reent.h

/* This header file provides the reentrancy.  */

/* WARNING: All identifiers here must begin with an underscore.  This file is
   included by stdio.h and others and we therefore must only use identifiers
   in the namespace allotted to us.  */

#ifndef _SYS_REENT_H_
#ifdef __cplusplus
extern "C" {
#endif
#define _SYS_REENT_H_

#include <_ansi.h>
#include <stddef.h>
#include <sys/_types.h>

#define _NULL 0

#ifndef __Long
#if __LONG_MAX__ == 2147483647L
#define __Long long
typedef unsigned __Long __ULong;
#elif __INT_MAX__ == 2147483647
#define __Long int
typedef unsigned __Long __ULong;
#endif
#endif

#if !defined( __Long)
#include <sys/types.h>
#endif

#ifndef __machine_flock_t_defined
#include <sys/lock.h>
typedef _LOCK_RECURSIVE_T _flock_t;
#endif

#ifndef __Long
#define __Long __int32_t
typedef __uint32_t __ULong;
#endif

struct _reent;

struct __locale_t;

/*
 * If _REENT_SMALL is defined, we make struct _reent as small as possible,
 * by having nearly everything possible allocated at first use.
 */

struct _Bigint
{
  struct _Bigint *_next;
  int _k, _maxwds, _sign, _wds;
  __ULong _x[1];
};

/* needed by reentrant structure */
struct __tm
{
  int   __tm_sec;
  int   __tm_min;
  int   __tm_hour;
  int   __tm_mday;
  int   __tm_mon;
  int   __tm_year;
  int   __tm_wday;
  int   __tm_yday;
  int   __tm_isdst;
};

/*
 * atexit() support.
 */

#define	_ATEXIT_SIZE 32	/* must be at least 32 to guarantee ANSI conformance */

struct _on_exit_args {
	void *  _fnargs[_ATEXIT_SIZE];	        /* user fn args */
	void *	_dso_handle[_ATEXIT_SIZE];
	/* Bitmask is set if user function takes arguments.  */
	__ULong _fntypes;           	        /* type of exit routine -
				   Must have at least _ATEXIT_SIZE bits */
	/* Bitmask is set if function was registered via __cxa_atexit.  */
	__ULong _is_cxa;
};

#ifdef _REENT_SMALL
struct _atexit {
	struct	_atexit *_next;			/* next in list */
	int	_ind;				/* next index in this table */
	void	(*_fns[_ATEXIT_SIZE])(void);	/* the table itself */
        struct _on_exit_args * _on_exit_args_ptr;
};
# define _ATEXIT_INIT {_NULL, 0, {_NULL}, _NULL}
#else
struct _atexit {
	struct	_atexit *_next;			/* next in list */
	int	_ind;				/* next index in this table */
	/* Some entries may already have been called, and will be NULL.  */
	void	(*_fns[_ATEXIT_SIZE])(void);	/* the table itself */
        struct _on_exit_args _on_exit_args;
};
# define _ATEXIT_INIT {_NULL, 0, {_NULL}, {{_NULL}, {_NULL}, 0, 0}}
#endif

#ifdef _REENT_GLOBAL_ATEXIT
# define _REENT_INIT_ATEXIT
#else
# define _REENT_INIT_ATEXIT \
  _NULL, _ATEXIT_INIT,
#endif

/*
 * Stdio buffers.
 *
 * This and __FILE are defined here because we need them for struct _reent,
 * but we don't want stdio.h included when stdlib.h is.
 */

struct __sbuf {
	unsigned char *_base;
	int	_size;
};

/*
 * Stdio state variables.
 *
 * The following always hold:
 *
 *	if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
 *		_lbfsize is -_bf._size, else _lbfsize is 0
 *	if _flags&__SRD, _w is 0
 *	if _flags&__SWR, _r is 0
 *
 * This ensures that the getc and putc macros (or inline functions) never
 * try to write or read from a file that is in `read' or `write' mode.
 * (Moreover, they can, and do, automatically switch from read mode to
 * write mode, and back, on "r+" and "w+" files.)
 *
 * _lbfsize is used only to make the inline line-buffered output stream
 * code as compact as possible.
 *
 * _ub, _up, and _ur are used when ungetc() pushes back more characters
 * than fit in the current _bf, or when ungetc() pushes back a character
 * that does not match the previous one in _bf.  When this happens,
 * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff
 * _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
 */

#if defined(_REENT_SMALL) && !defined(_REENT_GLOBAL_STDIO_STREAMS)
/*
 * struct __sFILE_fake is the start of a struct __sFILE, with only the
 * minimal fields allocated.  In __sinit() we really allocate the 3
 * standard streams, etc., and point away from this fake.
 */
struct __sFILE_fake {
  unsigned char *_p;	/* current position in (some) buffer */
  int	_r;		/* read space left for getc() */
  int	_w;		/* write space left for putc() */
  short	_flags;		/* flags, below; this FILE is free if 0 */
  short	_file;		/* fileno, if Unix descriptor, else -1 */
  struct __sbuf _bf;	/* the buffer (at least 1 byte, if !NULL) */
  int	_lbfsize;	/* 0 or -_bf._size, for inline putc */

  struct _reent *_data;
};

/* Following is needed both in libc/stdio and libc/stdlib so we put it
 * here instead of libc/stdio/local.h where it was previously. */

extern void   __sinit (struct _reent *);

# define _REENT_SMALL_CHECK_INIT(ptr)		\
  do						\
    {						\
      if ((ptr) && !(ptr)->__sdidinit)		\
	__sinit (ptr);				\
    }						\
  while (0)
#else /* _REENT_SMALL && !_REENT_GLOBAL_STDIO_STREAMS */
# define _REENT_SMALL_CHECK_INIT(ptr) /* nothing */
#endif /* _REENT_SMALL && !_REENT_GLOBAL_STDIO_STREAMS */

struct __sFILE {
  unsigned char *_p;	/* current position in (some) buffer */
  int	_r;		/* read space left for getc() */
  int	_w;		/* write space left for putc() */
  short	_flags;		/* flags, below; this FILE is free if 0 */
  short	_file;		/* fileno, if Unix descriptor, else -1 */
  struct __sbuf _bf;	/* the buffer (at least 1 byte, if !NULL) */
  int	_lbfsize;	/* 0 or -_bf._size, for inline putc */

#ifdef _REENT_SMALL
  struct _reent *_data;
#endif

  /* operations */
  void *	_cookie;	/* cookie passed to io functions */

  _READ_WRITE_RETURN_TYPE (*_read) (struct _reent *, void *,
					   char *, _READ_WRITE_BUFSIZE_TYPE);
  _READ_WRITE_RETURN_TYPE (*_write) (struct _reent *, void *,
					    const char *,
					    _READ_WRITE_BUFSIZE_TYPE);
  _fpos_t (*_seek) (struct _reent *, void *, _fpos_t, int);
  int (*_close) (struct _reent *, void *);

  /* separate buffer for long sequences of ungetc() */
  struct __sbuf _ub;	/* ungetc buffer */
  unsigned char *_up;	/* saved _p when _p is doing ungetc data */
  int	_ur;		/* saved _r when _r is counting ungetc data */

  /* tricks to meet minimum requirements even when malloc() fails */
  unsigned char _ubuf[3];	/* guarantee an ungetc() buffer */
  unsigned char _nbuf[1];	/* guarantee a getc() buffer */

  /* separate buffer for fgetline() when line crosses buffer boundary */
  struct __sbuf _lb;	/* buffer for fgetline() */

  /* Unix stdio files get aligned to block boundaries on fseek() */
  int	_blksize;	/* stat.st_blksize (may be != _bf._size) */
  _off_t _offset;	/* current lseek offset */

#ifndef _REENT_SMALL
  struct _reent *_data;	/* Here for binary compatibility? Remove? */
#endif

#ifndef __SINGLE_THREAD__
  _flock_t _lock;	/* for thread-safety locking */
#endif
  _mbstate_t _mbstate;	/* for wide char stdio functions. */
  int   _flags2;        /* for future use */
};

#ifdef __CUSTOM_FILE_IO__

/* Get custom _FILE definition.  */
#include <sys/custom_file.h>

#else /* !__CUSTOM_FILE_IO__ */
#ifdef __LARGE64_FILES
struct __sFILE64 {
  unsigned char *_p;	/* current position in (some) buffer */
  int	_r;		/* read space left for getc() */
  int	_w;		/* write space left for putc() */
  short	_flags;		/* flags, below; this FILE is free if 0 */
  short	_file;		/* fileno, if Unix descriptor, else -1 */
  struct __sbuf _bf;	/* the buffer (at least 1 byte, if !NULL) */
  int	_lbfsize;	/* 0 or -_bf._size, for inline putc */

  struct _reent *_data;

  /* operations */
  void *	_cookie;	/* cookie passed to io functions */

  _READ_WRITE_RETURN_TYPE (*_read) (struct _reent *, void *,
					   char *, _READ_WRITE_BUFSIZE_TYPE);
  _READ_WRITE_RETURN_TYPE (*_write) (struct _reent *, void *,
					    const char *,
					    _READ_WRITE_BUFSIZE_TYPE);
  _fpos_t (*_seek) (struct _reent *, void *, _fpos_t, int);
  int (*_close) (struct _reent *, void *);

  /* separate buffer for long sequences of ungetc() */
  struct __sbuf _ub;	/* ungetc buffer */
  unsigned char *_up;	/* saved _p when _p is doing ungetc data */
  int	_ur;		/* saved _r when _r is counting ungetc data */

  /* tricks to meet minimum requirements even when malloc() fails */
  unsigned char _ubuf[3];	/* guarantee an ungetc() buffer */
  unsigned char _nbuf[1];	/* guarantee a getc() buffer */

  /* separate buffer for fgetline() when line crosses buffer boundary */
  struct __sbuf _lb;	/* buffer for fgetline() */

  /* Unix stdio files get aligned to block boundaries on fseek() */
  int	_blksize;	/* stat.st_blksize (may be != _bf._size) */
  int   _flags2;        /* for future use */

  _off64_t _offset;     /* current lseek offset */
  _fpos64_t (*_seek64) (struct _reent *, void *, _fpos64_t, int);

#ifndef __SINGLE_THREAD__
  _flock_t _lock;	/* for thread-safety locking */
#endif
  _mbstate_t _mbstate;	/* for wide char stdio functions. */
};
typedef struct __sFILE64 __FILE;
#else
typedef struct __sFILE   __FILE;
#endif /* __LARGE64_FILES */
#endif /* !__CUSTOM_FILE_IO__ */

struct _glue
{
  struct _glue *_next;
  int _niobs;
  __FILE *_iobs;
};

/*
 * rand48 family support
 *
 * Copyright (c) 1993 Martin Birgmeier
 * All rights reserved.
 *
 * You may redistribute unmodified or modified versions of this source
 * code provided that the above copyright notice and this and the
 * following conditions are retained.
 *
 * This software is provided ``as is'', and comes with no warranties
 * of any kind. I shall in no event be liable for anything that happens
 * to anyone/anything when using this software.
 */
#define        _RAND48_SEED_0  (0x330e)
#define        _RAND48_SEED_1  (0xabcd)
#define        _RAND48_SEED_2  (0x1234)
#define        _RAND48_MULT_0  (0xe66d)
#define        _RAND48_MULT_1  (0xdeec)
#define        _RAND48_MULT_2  (0x0005)
#define        _RAND48_ADD     (0x000b)
struct _rand48 {
  unsigned short _seed[3];
  unsigned short _mult[3];
  unsigned short _add;
#ifdef _REENT_SMALL
  /* Put this in here as well, for good luck.  */
  __extension__ unsigned long long _rand_next;
#endif
};

/* How big the some arrays are.  */
#define _REENT_EMERGENCY_SIZE 25
#define _REENT_ASCTIME_SIZE 26
#define _REENT_SIGNAL_SIZE 24

/*
 * struct _reent
 *
 * This structure contains *all* globals needed by the library.
 * It's raison d'etre is to facilitate threads by making all library routines
 * reentrant.  IE: All state information is contained here.
 */

#ifdef _REENT_SMALL

struct _mprec
{
  /* used by mprec routines */
  struct _Bigint *_result;
  int _result_k;
  struct _Bigint *_p5s;
  struct _Bigint **_freelist;
};


struct _misc_reent
{
  /* miscellaneous reentrant data */
  char *_strtok_last;
  _mbstate_t _mblen_state;
  _mbstate_t _wctomb_state;
  _mbstate_t _mbtowc_state;
  char _l64a_buf[8];
  int _getdate_err;
  _mbstate_t _mbrlen_state;
  _mbstate_t _mbrtowc_state;
  _mbstate_t _mbsrtowcs_state;
  _mbstate_t _wcrtomb_state;
  _mbstate_t _wcsrtombs_state;
};

/* This version of _reent is laid out with "int"s in pairs, to help
 * ports with 16-bit int's but 32-bit pointers, align nicely.  */
struct _reent
{
  /* As an exception to the above put _errno first for binary
     compatibility with non _REENT_SMALL targets.  */
  int _errno;			/* local copy of errno */

  /* FILE is a big struct and may change over time.  To try to achieve binary
     compatibility with future versions, put stdin,stdout,stderr here.
     These are pointers into member __sf defined below.  */
  __FILE *_stdin, *_stdout, *_stderr;	/* XXX */

  int  _inc;			/* used by tmpnam */

  char *_emergency;

  int __sdidinit;		/* 1 means stdio has been init'd */

  int _unspecified_locale_info;	/* unused, reserved for locale stuff */
  struct __locale_t *_locale;/* per-thread locale */

  struct _mprec *_mp;

  void (*__cleanup) (struct _reent *);

  int _gamma_signgam;

  /* used by some fp conversion routines */
  int _cvtlen;			/* should be size_t */
  char *_cvtbuf;

  struct _rand48 *_r48;
  struct __tm *_localtime_buf;
  char *_asctime_buf;

  /* signal info */
  void (**(_sig_func))(int);

# ifndef _REENT_GLOBAL_ATEXIT
  /* atexit stuff */
  struct _atexit *_atexit;
  struct _atexit _atexit0;
# endif

  struct _glue __sglue;			/* root of glue chain */
  __FILE *__sf;			        /* file descriptors */
  struct _misc_reent *_misc;            /* strtok, multibyte states */
  char *_signal_buf;                    /* strsignal */
};

#ifdef _REENT_GLOBAL_STDIO_STREAMS
extern __FILE __sf[3];

# define _REENT_INIT(var) \
  { 0, \
    &__sf[0], \
    &__sf[1], \
    &__sf[2], \
    0,   \
    _NULL, \
    0, \
    0, \
    _NULL, \
    _NULL, \
    _NULL, \
    0, \
    0, \
    _NULL, \
    _NULL, \
    _NULL, \
    _NULL, \
    _NULL, \
    _REENT_INIT_ATEXIT \
    {_NULL, 0, _NULL}, \
    _NULL, \
    _NULL, \
    _NULL \
  }

#define _REENT_INIT_PTR_ZEROED(var) \
  { (var)->_stdin = &__sf[0]; \
    (var)->_stdout = &__sf[1]; \
    (var)->_stderr = &__sf[2]; \
  }

#else /* _REENT_GLOBAL_STDIO_STREAMS */

extern const struct __sFILE_fake __sf_fake_stdin;
extern const struct __sFILE_fake __sf_fake_stdout;
extern const struct __sFILE_fake __sf_fake_stderr;

# define _REENT_INIT(var) \
  { 0, \
    (__FILE *)&__sf_fake_stdin, \
    (__FILE *)&__sf_fake_stdout, \
    (__FILE *)&__sf_fake_stderr, \
    0, \
    _NULL, \
    0, \
    0, \
    _NULL, \
    _NULL, \
    _NULL, \
    0, \
    0, \
    _NULL, \
    _NULL, \
    _NULL, \
    _NULL, \
    _NULL, \
    _REENT_INIT_ATEXIT \
    {_NULL, 0, _NULL}, \
    _NULL, \
    _NULL, \
    _NULL \
  }

#define _REENT_INIT_PTR_ZEROED(var) \
  { (var)->_stdin = (__FILE *)&__sf_fake_stdin; \
    (var)->_stdout = (__FILE *)&__sf_fake_stdout; \
    (var)->_stderr = (__FILE *)&__sf_fake_stderr; \
  }

#endif /* _REENT_GLOBAL_STDIO_STREAMS */

/* Only add assert() calls if we are specified to debug.  */
#ifdef _REENT_CHECK_DEBUG
#include <assert.h>
#define __reent_assert(x) assert(x)
#else
#define __reent_assert(x) ((void)0)
#endif

#ifdef __CUSTOM_FILE_IO__
#error Custom FILE I/O and _REENT_SMALL not currently supported.
#endif

/* Generic _REENT check macro.  */
#define _REENT_CHECK(var, what, type, size, init) do { \
  struct _reent *_r = (var); \
  if (_r->what == NULL) { \
    _r->what = (type)malloc(size); \
    __reent_assert(_r->what); \
    init; \
  } \
} while (0)

#define _REENT_CHECK_TM(var) \
  _REENT_CHECK(var, _localtime_buf, struct __tm *, sizeof *((var)->_localtime_buf), \
    /* nothing */)

#define _REENT_CHECK_ASCTIME_BUF(var) \
  _REENT_CHECK(var, _asctime_buf, char *, _REENT_ASCTIME_SIZE, \
    memset((var)->_asctime_buf, 0, _REENT_ASCTIME_SIZE))

/* Handle the dynamically allocated rand48 structure. */
#define _REENT_INIT_RAND48(var) do { \
  struct _reent *_r = (var); \
  _r->_r48->_seed[0] = _RAND48_SEED_0; \
  _r->_r48->_seed[1] = _RAND48_SEED_1; \
  _r->_r48->_seed[2] = _RAND48_SEED_2; \
  _r->_r48->_mult[0] = _RAND48_MULT_0; \
  _r->_r48->_mult[1] = _RAND48_MULT_1; \
  _r->_r48->_mult[2] = _RAND48_MULT_2; \
  _r->_r48->_add = _RAND48_ADD; \
  _r->_r48->_rand_next = 1; \
} while (0)
#define _REENT_CHECK_RAND48(var) \
  _REENT_CHECK(var, _r48, struct _rand48 *, sizeof *((var)->_r48), _REENT_INIT_RAND48((var)))

#define _REENT_INIT_MP(var) do { \
  struct _reent *_r = (var); \
  _r->_mp->_result_k = 0; \
  _r->_mp->_result = _r->_mp->_p5s = _NULL; \
  _r->_mp->_freelist = _NULL; \
} while (0)
#define _REENT_CHECK_MP(var) \
  _REENT_CHECK(var, _mp, struct _mprec *, sizeof *((var)->_mp), _REENT_INIT_MP(var))

#define _REENT_CHECK_EMERGENCY(var) \
  _REENT_CHECK(var, _emergency, char *, _REENT_EMERGENCY_SIZE, /* nothing */)

#define _REENT_INIT_MISC(var) do { \
  struct _reent *_r = (var); \
  _r->_misc->_strtok_last = _NULL; \
  _r->_misc->_mblen_state.__count = 0; \
  _r->_misc->_mblen_state.__value.__wch = 0; \
  _r->_misc->_wctomb_state.__count = 0; \
  _r->_misc->_wctomb_state.__value.__wch = 0; \
  _r->_misc->_mbtowc_state.__count = 0; \
  _r->_misc->_mbtowc_state.__value.__wch = 0; \
  _r->_misc->_mbrlen_state.__count = 0; \
  _r->_misc->_mbrlen_state.__value.__wch = 0; \
  _r->_misc->_mbrtowc_state.__count = 0; \
  _r->_misc->_mbrtowc_state.__value.__wch = 0; \
  _r->_misc->_mbsrtowcs_state.__count = 0; \
  _r->_misc->_mbsrtowcs_state.__value.__wch = 0; \
  _r->_misc->_wcrtomb_state.__count = 0; \
  _r->_misc->_wcrtomb_state.__value.__wch = 0; \
  _r->_misc->_wcsrtombs_state.__count = 0; \
  _r->_misc->_wcsrtombs_state.__value.__wch = 0; \
  _r->_misc->_l64a_buf[0] = '\0'; \
  _r->_misc->_getdate_err = 0; \
} while (0)
#define _REENT_CHECK_MISC(var) \
  _REENT_CHECK(var, _misc, struct _misc_reent *, sizeof *((var)->_misc), _REENT_INIT_MISC(var))

#define _REENT_CHECK_SIGNAL_BUF(var) \
  _REENT_CHECK(var, _signal_buf, char *, _REENT_SIGNAL_SIZE, /* nothing */)

#define _REENT_SIGNGAM(ptr)	((ptr)->_gamma_signgam)
#define _REENT_RAND_NEXT(ptr)	((ptr)->_r48->_rand_next)
#define _REENT_RAND48_SEED(ptr)	((ptr)->_r48->_seed)
#define _REENT_RAND48_MULT(ptr)	((ptr)->_r48->_mult)
#define _REENT_RAND48_ADD(ptr)	((ptr)->_r48->_add)
#define _REENT_MP_RESULT(ptr)	((ptr)->_mp->_result)
#define _REENT_MP_RESULT_K(ptr)	((ptr)->_mp->_result_k)
#define _REENT_MP_P5S(ptr)	((ptr)->_mp->_p5s)
#define _REENT_MP_FREELIST(ptr)	((ptr)->_mp->_freelist)
#define _REENT_ASCTIME_BUF(ptr)	((ptr)->_asctime_buf)
#define _REENT_TM(ptr)		((ptr)->_localtime_buf)
#define _REENT_EMERGENCY(ptr)	((ptr)->_emergency)
#define _REENT_STRTOK_LAST(ptr)	((ptr)->_misc->_strtok_last)
#define _REENT_MBLEN_STATE(ptr)	((ptr)->_misc->_mblen_state)
#define _REENT_MBTOWC_STATE(ptr)((ptr)->_misc->_mbtowc_state)
#define _REENT_WCTOMB_STATE(ptr)((ptr)->_misc->_wctomb_state)
#define _REENT_MBRLEN_STATE(ptr) ((ptr)->_misc->_mbrlen_state)
#define _REENT_MBRTOWC_STATE(ptr) ((ptr)->_misc->_mbrtowc_state)
#define _REENT_MBSRTOWCS_STATE(ptr) ((ptr)->_misc->_mbsrtowcs_state)
#define _REENT_WCRTOMB_STATE(ptr) ((ptr)->_misc->_wcrtomb_state)
#define _REENT_WCSRTOMBS_STATE(ptr) ((ptr)->_misc->_wcsrtombs_state)
#define _REENT_L64A_BUF(ptr)    ((ptr)->_misc->_l64a_buf)
#define _REENT_GETDATE_ERR_P(ptr) (&((ptr)->_misc->_getdate_err))
#define _REENT_SIGNAL_BUF(ptr)  ((ptr)->_signal_buf)

#else /* !_REENT_SMALL */

struct _reent
{
  int _errno;			/* local copy of errno */

  /* FILE is a big struct and may change over time.  To try to achieve binary
     compatibility with future versions, put stdin,stdout,stderr here.
     These are pointers into member __sf defined below.  */
  __FILE *_stdin, *_stdout, *_stderr;

  int  _inc;			/* used by tmpnam */
  char _emergency[_REENT_EMERGENCY_SIZE];

  /* TODO */
  int _unspecified_locale_info;	/* unused, reserved for locale stuff */
  struct __locale_t *_locale;/* per-thread locale */

  int __sdidinit;		/* 1 means stdio has been init'd */

  void (*__cleanup) (struct _reent *);

  /* used by mprec routines */
  struct _Bigint *_result;
  int _result_k;
  struct _Bigint *_p5s;
  struct _Bigint **_freelist;

  /* used by some fp conversion routines */
  int _cvtlen;			/* should be size_t */
  char *_cvtbuf;

  union
    {
      struct
        {
          unsigned int _unused_rand;
          char * _strtok_last;
          char _asctime_buf[_REENT_ASCTIME_SIZE];
          struct __tm _localtime_buf;
          int _gamma_signgam;
          __extension__ unsigned long long _rand_next;
          struct _rand48 _r48;
          _mbstate_t _mblen_state;
          _mbstate_t _mbtowc_state;
          _mbstate_t _wctomb_state;
          char _l64a_buf[8];
          char _signal_buf[_REENT_SIGNAL_SIZE];
          int _getdate_err;
          _mbstate_t _mbrlen_state;
          _mbstate_t _mbrtowc_state;
          _mbstate_t _mbsrtowcs_state;
          _mbstate_t _wcrtomb_state;
          _mbstate_t _wcsrtombs_state;
	  int _h_errno;
        } _reent;
  /* Two next two fields were once used by malloc.  They are no longer
     used. They are used to preserve the space used before so as to
     allow addition of new reent fields and keep binary compatibility.   */
      struct
        {
#define _N_LISTS 30
          unsigned char * _nextf[_N_LISTS];
          unsigned int _nmalloc[_N_LISTS];
        } _unused;
    } _new;

# ifndef _REENT_GLOBAL_ATEXIT
  /* atexit stuff */
  struct _atexit *_atexit;	/* points to head of LIFO stack */
  struct _atexit _atexit0;	/* one guaranteed table, required by ANSI */
# endif

  /* signal info */
  void (**(_sig_func))(int);

  /* These are here last so that __FILE can grow without changing the offsets
     of the above members (on the off chance that future binary compatibility
     would be broken otherwise).  */
  struct _glue __sglue;		/* root of glue chain */
# ifndef _REENT_GLOBAL_STDIO_STREAMS
  __FILE __sf[3];  		/* first three file descriptors */
# endif
};

#ifdef _REENT_GLOBAL_STDIO_STREAMS
extern __FILE __sf[3];
#define _REENT_STDIO_STREAM(var, index) &__sf[index]
#else
#define _REENT_STDIO_STREAM(var, index) &(var)->__sf[index]
#endif

#define _REENT_INIT(var) \
  { 0, \
    _REENT_STDIO_STREAM(&(var), 0), \
    _REENT_STDIO_STREAM(&(var), 1), \
    _REENT_STDIO_STREAM(&(var), 2), \
    0, \
    "", \
    0, \
    _NULL, \
    0, \
    _NULL, \
    _NULL, \
    0, \
    _NULL, \
    _NULL, \
    0, \
    _NULL, \
    { \
      { \
        0, \
        _NULL, \
        "", \
        {0, 0, 0, 0, 0, 0, 0, 0, 0}, \
        0, \
        1, \
        { \
          {_RAND48_SEED_0, _RAND48_SEED_1, _RAND48_SEED_2}, \
          {_RAND48_MULT_0, _RAND48_MULT_1, _RAND48_MULT_2}, \
          _RAND48_ADD \
        }, \
        {0, {0}}, \
        {0, {0}}, \
        {0, {0}}, \
        "", \
        "", \
        0, \
        {0, {0}}, \
        {0, {0}}, \
        {0, {0}}, \
        {0, {0}}, \
        {0, {0}} \
      } \
    }, \
    _REENT_INIT_ATEXIT \
    _NULL, \
    {_NULL, 0, _NULL} \
  }

#define _REENT_INIT_PTR_ZEROED(var) \
  { (var)->_stdin = _REENT_STDIO_STREAM(var, 0); \
    (var)->_stdout = _REENT_STDIO_STREAM(var, 1); \
    (var)->_stderr = _REENT_STDIO_STREAM(var, 2); \
    (var)->_new._reent._rand_next = 1; \
    (var)->_new._reent._r48._seed[0] = _RAND48_SEED_0; \
    (var)->_new._reent._r48._seed[1] = _RAND48_SEED_1; \
    (var)->_new._reent._r48._seed[2] = _RAND48_SEED_2; \
    (var)->_new._reent._r48._mult[0] = _RAND48_MULT_0; \
    (var)->_new._reent._r48._mult[1] = _RAND48_MULT_1; \
    (var)->_new._reent._r48._mult[2] = _RAND48_MULT_2; \
    (var)->_new._reent._r48._add = _RAND48_ADD; \
  }

#define _REENT_CHECK_RAND48(ptr)	/* nothing */
#define _REENT_CHECK_MP(ptr)		/* nothing */
#define _REENT_CHECK_TM(ptr)		/* nothing */
#define _REENT_CHECK_ASCTIME_BUF(ptr)	/* nothing */
#define _REENT_CHECK_EMERGENCY(ptr)	/* nothing */
#define _REENT_CHECK_MISC(ptr)	        /* nothing */
#define _REENT_CHECK_SIGNAL_BUF(ptr)	/* nothing */

#define _REENT_SIGNGAM(ptr)	((ptr)->_new._reent._gamma_signgam)
#define _REENT_RAND_NEXT(ptr)	((ptr)->_new._reent._rand_next)
#define _REENT_RAND48_SEED(ptr)	((ptr)->_new._reent._r48._seed)
#define _REENT_RAND48_MULT(ptr)	((ptr)->_new._reent._r48._mult)
#define _REENT_RAND48_ADD(ptr)	((ptr)->_new._reent._r48._add)
#define _REENT_MP_RESULT(ptr)	((ptr)->_result)
#define _REENT_MP_RESULT_K(ptr)	((ptr)->_result_k)
#define _REENT_MP_P5S(ptr)	((ptr)->_p5s)
#define _REENT_MP_FREELIST(ptr)	((ptr)->_freelist)
#define _REENT_ASCTIME_BUF(ptr)	((ptr)->_new._reent._asctime_buf)
#define _REENT_TM(ptr)		(&(ptr)->_new._reent._localtime_buf)
#define _REENT_EMERGENCY(ptr)	((ptr)->_emergency)
#define _REENT_STRTOK_LAST(ptr)	((ptr)->_new._reent._strtok_last)
#define _REENT_MBLEN_STATE(ptr)	((ptr)->_new._reent._mblen_state)
#define _REENT_MBTOWC_STATE(ptr)((ptr)->_new._reent._mbtowc_state)
#define _REENT_WCTOMB_STATE(ptr)((ptr)->_new._reent._wctomb_state)
#define _REENT_MBRLEN_STATE(ptr)((ptr)->_new._reent._mbrlen_state)
#define _REENT_MBRTOWC_STATE(ptr)((ptr)->_new._reent._mbrtowc_state)
#define _REENT_MBSRTOWCS_STATE(ptr)((ptr)->_new._reent._mbsrtowcs_state)
#define _REENT_WCRTOMB_STATE(ptr)((ptr)->_new._reent._wcrtomb_state)
#define _REENT_WCSRTOMBS_STATE(ptr)((ptr)->_new._reent._wcsrtombs_state)
#define _REENT_L64A_BUF(ptr)    ((ptr)->_new._reent._l64a_buf)
#define _REENT_SIGNAL_BUF(ptr)  ((ptr)->_new._reent._signal_buf)
#define _REENT_GETDATE_ERR_P(ptr) (&((ptr)->_new._reent._getdate_err))

#endif /* !_REENT_SMALL */

#define _REENT_INIT_PTR(var) \
  { memset((var), 0, sizeof(*(var))); \
    _REENT_INIT_PTR_ZEROED(var); \
  }

/* This value is used in stdlib/misc.c.  reent/reent.c has to know it
   as well to make sure the freelist is correctly free'd.  Therefore
   we define it here, rather than in stdlib/misc.c, as before. */
#define _Kmax (sizeof (size_t) << 3)

/*
 * All references to struct _reent are via this pointer.
 * Internally, newlib routines that need to reference it should use _REENT.
 */

#ifndef __ATTRIBUTE_IMPURE_PTR__
#define __ATTRIBUTE_IMPURE_PTR__
#endif

extern struct _reent *_impure_ptr __ATTRIBUTE_IMPURE_PTR__;
extern struct _reent *const _global_impure_ptr __ATTRIBUTE_IMPURE_PTR__;

void _reclaim_reent (struct _reent *);

/* #define _REENT_ONLY define this to get only reentrant routines */

#if defined(__DYNAMIC_REENT__) && !defined(__SINGLE_THREAD__)
#ifndef __getreent
  struct _reent * __getreent (void);
#endif
# define _REENT (__getreent())
#else /* __SINGLE_THREAD__ || !__DYNAMIC_REENT__ */
# define _REENT _impure_ptr
#endif /* __SINGLE_THREAD__ || !__DYNAMIC_REENT__ */

#define _GLOBAL_REENT _global_impure_ptr

#ifdef _REENT_GLOBAL_ATEXIT
extern struct _atexit *_global_atexit; /* points to head of LIFO stack */
# define _GLOBAL_ATEXIT _global_atexit
#else
# define _GLOBAL_ATEXIT (_GLOBAL_REENT->_atexit)
#endif

#ifdef __cplusplus
}
#endif
#endif /* _SYS_REENT_H_ */