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

/*

 * 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.

 */

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include "local.h"

static void

std (ptr, flags, file, data)

     FILE *ptr;

     struct _reent *data;

{

  ptr->_p = 0;

  ptr->_r = 0;

  ptr->_w = 0;

  ptr->_flags = flags;

  ptr->_file = file;

  ptr->_bf._base = 0;

  ptr->_bf._size = 0;

  ptr->_lbfsize = 0;

  ptr->_cookie = ptr;

  ptr->_read = __sread;

  ptr->_write = __swrite;

  ptr->_seek = __sseek;

  ptr->_close = __sclose;

  ptr->_data = data;

}

struct _glue *

__sfmoreglue (d, n)

     struct _reent *d;

     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 *

__sfp (d)

     struct _reent *d;

{

  FILE *fp;

  int n;

  struct _glue *g;

  if (!d->__sdidinit)

    __sinit (d);

  for (g = &d->__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;

    }

  d->_errno = ENOMEM;

  return NULL;

found:

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

  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 */

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

  /* 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;

  fp->_data = d;

  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

_cleanup_r (ptr)

     struct _reent *ptr;

{

  /* (void) _fwalk(fclose); */

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

}

#ifndef _REENT_ONLY

void

_cleanup ()

{

  _cleanup_r (_REENT);

}

#endif

/*

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

 */

void

__sinit (s)

     struct _reent *s;

{

  /* make sure we clean up on exit */

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

  s->__sdidinit = 1;

  std (s->__sf + 0, __SRD, 0, s);

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

  std (s->__sf + 2, __SWR | __SNBF, 2, s);

  s->__sglue._next = NULL;

  s->__sglue._niobs = 3;

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

}