/* FINDFP.C

 * 

 * Portions Copyright (c) 1990-2008 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved.

 */

/* 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_r.h>

#include <stdlib_r.h>

#include <errno.h>

#include <string.h>

#include "LOCAL.H"

/* Initialise a FILE structure to a starting state */

#ifdef __GCCXML__

static void

_std (FILE *ptr, int flags, int file, struct _reent *data)

#else

static void

std (FILE *ptr, int flags, int file, struct _reent *data)

#endif

{

  ptr->_p = 0;

  ptr->_r = 0;

  ptr->_w = 0;

  ptr->_flags = (short)flags;

  ptr->_file = (short)file;

  ptr->_bf._base = 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 (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 (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.

 */

/**

A reentrant version of _cleanup().

*/

EXPORT_C void

_cleanup_r (struct _reent *ptr)

{

  (void) _fwalk(ptr, fclose);

}

#ifndef _REENT_ONLY

/**

Performs cleanup

*/

EXPORT_C void

_cleanup (void)

{

  _cleanup_r (_REENT);

}

#endif

/*

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

 */

void

__sinit (struct _reent *s)

{

  /* make sure we clean up on exit */

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

  s->__sdidinit = 1;

#ifdef __GCCXML__

  _std (_stdin_r(s),  __SRD, 0, s);

  _std (_stdout_r(s), __SWR, 1, s);

  _std (_stderr_r(s), __SWR | __SNBF, 2, s);

#else

  std (_stdin_r(s),  __SRD, 0, s);

  std (_stdout_r(s), __SWR, 1, s);

  std (_stderr_r(s), __SWR | __SNBF, 2, s);

#endif

  /* initialise the head of the glue chain to cover stdim/stdout/stderr */

  s->__sglue._next = NULL;

  s->__sglue._niobs = 3;

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

}

/* Function interface to stdin/stdout/stderr 

 *

 * These functions should return a value which is fixed for any given

 * reentrancy context, but it doesn't have to be fixed at compile time,

 * and we don't need to have initialised stdio either.

 */

/**

Function interface to the "constants" stdin.

These functions guarantee to return a fixed value, so that it 

will be possible to use expressions such as if (fp != stdout) fclose(fp);

with complete confidence. Unfortunately it will rule out initialising global

variables with stdin/stdout/stderr, as in the common idiom:

static FILE *log = stderr;

This isn't currently possible with EPOC32. 

*/

EXPORT_C FILE *__stdin (void)

{

	return _stdin_r(_REENT);

}

/**

Function interface to the "constants" stdout

See __stdin

*/

EXPORT_C FILE *__stdout (void)

{

	return _stdout_r(_REENT);

}

/**

Function interface to the "constants" stderr

See __stdin

*/

EXPORT_C FILE *__stderr (void)

{

	return _stderr_r(_REENT);

}