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/*

 * Copyright (c) 1990 The Regents of the University of California.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms are permitted

 * provided that the above copyright notice and this paragraph are

 * duplicated in all such forms and that any documentation,

 * advertising materials, and other materials related to such

 * distribution and use acknowledge that the software was developed

 * by the University of California, Berkeley.  The name of the

 * University may not be used to endorse or promote products derived

 * from this software without specific prior written permission.

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 */

/* No user fns here.  Pesch 15apr92. */

#include <_ansi.h>

#include <reent.h>

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <fcntl.h>

#include <sys/lock.h>

#include "local.h"

#ifdef _REENT_SMALL

const struct __sFILE_fake __sf_fake_stdin =

    {_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL};

const struct __sFILE_fake __sf_fake_stdout =

    {_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL};

const struct __sFILE_fake __sf_fake_stderr =

    {_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL};

#endif

static _VOID

_DEFUN(std, (ptr, flags, file, data),

            FILE *ptr _AND

            int flags _AND

            int file  _AND

            struct _reent *data)

{

  ptr->_p = 0;

  ptr->_r = 0;

  ptr->_w = 0;

  ptr->_flags = flags;

  ptr->_flags2 = 0;

  ptr->_file = file;

  ptr->_bf._base = 0;

  ptr->_bf._size = 0;

  ptr->_lbfsize = 0;

  memset (&ptr->_mbstate, 0, sizeof (_mbstate_t));

  ptr->_cookie = ptr;

  ptr->_read = __sread;

#ifndef __LARGE64_FILES

  ptr->_write = __swrite;

#else /* __LARGE64_FILES */

  ptr->_write = __swrite64;

  ptr->_seek64 = __sseek64;

  ptr->_flags |= __SL64;

#endif /* __LARGE64_FILES */

  ptr->_seek = __sseek;

  ptr->_close = __sclose;

#if !defined(__SINGLE_THREAD__) && !defined(_REENT_SMALL)

  __lock_init_recursive (ptr->_lock);

  /*

   * #else

   * lock is already initialized in __sfp

   */

#endif

#ifdef __SCLE

  if (__stextmode (ptr->_file))

    ptr->_flags |= __SCLE;

#endif

}

struct _glue *

_DEFUN(__sfmoreglue, (d, n),

       struct _reent *d _AND

       register int n)

{

  struct _glue *g;

  FILE *p;

  g = (struct _glue *) _malloc_r (d, sizeof (*g) + n * sizeof (FILE));

  if (g == NULL)

    return NULL;

  p = (FILE *) (g + 1);

  g->_next = NULL;

  g->_niobs = n;

  g->_iobs = p;

  memset (p, 0, n * sizeof (FILE));

  return g;

}

/*

 * Find a free FILE for fopen et al.

 */

FILE *

_DEFUN(__sfp, (d),

       struct _reent *d)

{

  FILE *fp;

  int n;

  struct _glue *g;

  __sfp_lock_acquire ();

  if (!_GLOBAL_REENT->__sdidinit)

    __sinit (_GLOBAL_REENT);

  for (g = &_GLOBAL_REENT->__sglue;; g = g->_next)

    {

      for (fp = g->_iobs, n = g->_niobs; --n >= 0; fp++)

        if (fp->_flags == 0)

          goto found;

      if (g->_next == NULL &&

          (g->_next = __sfmoreglue (d, NDYNAMIC)) == NULL)

        break;

    }

  __sfp_lock_release ();

  d->_errno = ENOMEM;

  return NULL;

found:

  fp->_file = -1;               /* no file */

  fp->_flags = 1;               /* reserve this slot; caller sets real flags */

  fp->_flags2 = 0;

#ifndef __SINGLE_THREAD__

  __lock_init_recursive (fp->_lock);

#endif

  __sfp_lock_release ();

  fp->_p = NULL;                /* no current pointer */

  fp->_w = 0;                    /* nothing to read or write */

  fp->_r = 0;

  fp->_bf._base = NULL;         /* no buffer */

  fp->_bf._size = 0;

  fp->_lbfsize = 0;              /* not line buffered */

  memset (&fp->_mbstate, 0, sizeof (_mbstate_t));

  /* fp->_cookie = <any>; */    /* caller sets cookie, _read/_write etc */

  fp->_ub._base = NULL;         /* no ungetc buffer */

  fp->_ub._size = 0;

  fp->_lb._base = NULL;         /* no line buffer */

  fp->_lb._size = 0;

  return fp;

}

/*

 * exit() calls _cleanup() through *__cleanup, set whenever we

 * open or buffer a file.  This chicanery is done so that programs

 * that do not use stdio need not link it all in.

 *

 * The name `_cleanup' is, alas, fairly well known outside stdio.

 */

_VOID

_DEFUN(_cleanup_r, (ptr),

       struct _reent *ptr)

{

  _CAST_VOID _fwalk(ptr, fclose);

  /* _CAST_VOID _fwalk (ptr, fflush); */        /* `cheating' */

}

#ifndef _REENT_ONLY

_VOID

_DEFUN_VOID(_cleanup)

{

  _cleanup_r (_GLOBAL_REENT);

}

#endif

/*

 * __sinit() is called whenever stdio's internal variables must be set up.

 */

_VOID

_DEFUN(__sinit, (s),

       struct _reent *s)

{

  __sinit_lock_acquire ();

  if (s->__sdidinit)

    {

      __sinit_lock_release ();

      return;

    }

  /* make sure we clean up on exit */

  s->__cleanup = _cleanup_r;    /* conservative */

  s->__sdidinit = 1;

  s->__sglue._next = NULL;

#ifndef _REENT_SMALL

  s->__sglue._niobs = 3;

  s->__sglue._iobs = &s->__sf[0];

#else

  s->__sglue._niobs = 0;

  s->__sglue._iobs = NULL;

  s->_stdin = __sfp(s);

  s->_stdout = __sfp(s);

  s->_stderr = __sfp(s);

#endif

  std (s->_stdin,  __SRD, 0, s);

  /* On platforms that have true file system I/O, we can verify

     whether stdout is an interactive terminal or not, as part of

     __smakebuf on first use of the stream.  For all other platforms,

     we will default to line buffered mode here.  Technically, POSIX

     requires both stdin and stdout to be line-buffered, but tradition

     leaves stdin alone on systems without fcntl.  */

#ifdef HAVE_FCNTL

  std (s->_stdout, __SWR, 1, s);

#else

  std (s->_stdout, __SWR | __SLBF, 1, s);

#endif

  /* POSIX requires stderr to be opened for reading and writing, even

     when the underlying fd 2 is write-only.  */

  std (s->_stderr, __SRW | __SNBF, 2, s);

  __sinit_lock_release ();

}

#ifndef __SINGLE_THREAD__

__LOCK_INIT_RECURSIVE(static, __sfp_lock);

__LOCK_INIT_RECURSIVE(static, __sinit_lock);

_VOID

_DEFUN_VOID(__sfp_lock_acquire)

{

  __lock_acquire_recursive (__sfp_lock);

}

_VOID

_DEFUN_VOID(__sfp_lock_release)

{

  __lock_release_recursive (__sfp_lock);

}

_VOID

_DEFUN_VOID(__sinit_lock_acquire)

{

  __lock_acquire_recursive (__sinit_lock);

}

_VOID

_DEFUN_VOID(__sinit_lock_release)

{

  __lock_release_recursive (__sinit_lock);

}

/* Walkable file locking routine.  */

static int

_DEFUN(__fp_lock, (ptr),

       FILE * ptr)

{

  _flockfile (ptr);

  return 0;

}

/* Walkable file unlocking routine.  */

static int

_DEFUN(__fp_unlock, (ptr),

       FILE * ptr)

{

  _funlockfile (ptr);

  return 0;

}

_VOID

_DEFUN_VOID(__fp_lock_all)

{

  __sfp_lock_acquire ();

  _CAST_VOID _fwalk (_REENT, __fp_lock);

}

_VOID

_DEFUN_VOID(__fp_unlock_all)

{

  _CAST_VOID _fwalk (_REENT, __fp_unlock);

  __sfp_lock_release ();

}

#endif