Subversion Repositories openrisc_2011-10-31

/*

 * 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.

 */

/*

FUNCTION

<<fgetc>>---get a character from a file or stream

INDEX

        fgetc

INDEX

        _fgetc_r

ANSI_SYNOPSIS

        #include <stdio.h>

        int fgetc(FILE *<[fp]>);

        #include <stdio.h>

        int _fgetc_r(struct _reent *<[ptr]>, FILE *<[fp]>);

TRAD_SYNOPSIS

        #include <stdio.h>

        int fgetc(<[fp]>)

        FILE *<[fp]>;

        #include <stdio.h>

        int _fgetc_r(<[ptr]>, <[fp]>)

        struct _reent *<[ptr]>;

        FILE *<[fp]>;

DESCRIPTION

Use <<fgetc>> to get the next single character from the file or stream

identified by <[fp]>.  As a side effect, <<fgetc>> advances the file's

current position indicator.

For a macro version of this function, see <<getc>>.

The function <<_fgetc_r>> is simply a reentrant version of

<<fgetc>> that is passed the additional reentrant structure

pointer argument: <[ptr]>.

RETURNS

The next character (read as an <<unsigned char>>, and cast to

<<int>>), unless there is no more data, or the host system reports a

read error; in either of these situations, <<fgetc>> returns <<EOF>>.

You can distinguish the two situations that cause an <<EOF>> result by

using the <<ferror>> and <<feof>> functions.

PORTABILITY

ANSI C requires <<fgetc>>.

Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,

<<lseek>>, <<read>>, <<sbrk>>, <<write>>.

*/

#include <_ansi.h>

#include <stdio.h>

#include "local.h"

int

_DEFUN(_fgetc_r, (ptr, fp),

       struct _reent * ptr _AND

       FILE * fp)

{

  int result;

  CHECK_INIT(ptr, fp);

  _flockfile (fp);

  result = __sgetc_r (ptr, fp);

  _funlockfile (fp);

  return result;

}

#ifndef _REENT_ONLY

int

_DEFUN(fgetc, (fp),

       FILE * fp)

{

#if !defined(PREFER_SIZE_OVER_SPEED) && !defined(__OPTIMIZE_SIZE__)

  int result;

  CHECK_INIT(_REENT, fp);

  __sfp_lock_acquire ();

  _flockfile (fp);

  result = __sgetc_r (_REENT, fp);

  _funlockfile (fp);

  __sfp_lock_release ();

  return result;

#else

  return _fgetc_r (_REENT, fp);

#endif

}

#endif /* !_REENT_ONLY */