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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.
 */
 
/*
FUNCTION
<<getc>>---read a character (macro)
 
INDEX
	getc
INDEX
	_getc_r
 
ANSI_SYNOPSIS
	#include <stdio.h>
	int getc(FILE *<[fp]>);
 
	#include <stdio.h>
	int _getc_r(struct _reent *<[ptr]>, FILE *<[fp]>);
 
TRAD_SYNOPSIS
	#include <stdio.h>
	int getc(<[fp]>)
	FILE *<[fp]>;
 
	#include <stdio.h>
	int _getc_r(<[ptr]>, <[fp]>)
	struct _reent *<[ptr]>;
	FILE *<[fp]>;
 
DESCRIPTION
<<getc>> is a macro, defined in <<stdio.h>>.  You can use <<getc>>
to get the next single character from the file or stream
identified by <[fp]>.  As a side effect, <<getc>> advances the file's
current position indicator.
 
For a subroutine version of this macro, see <<fgetc>>.
 
The <<_getc_r>> function is simply the reentrant version of <<getc>>
which passes an additional reentrancy 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, <<getc>> returns <<EOF>>.
 
You can distinguish the two situations that cause an <<EOF>> result by
using the <<ferror>> and <<feof>> functions.
 
PORTABILITY
ANSI C requires <<getc>>; it suggests, but does not require, that
<<getc>> be implemented as a macro.  The standard explicitly permits
macro implementations of <<getc>> to use the argument more than once;
therefore, in a portable program, you should not use an expression
with side effects as the <<getc>> argument.
 
Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
*/
 
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "%W% (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */
 
#include <_ansi.h>
#include <stdio.h>
#include "local.h"
 
/*
 * A subroutine version of the macro getc.
 */
 
#undef getc
 
int
_DEFUN(_getc_r, (ptr, fp),
       struct _reent *ptr _AND
       register FILE *fp)
{
  int result;
  CHECK_INIT (ptr, fp);
  __sfp_lock_acquire ();
  _flockfile (fp);
  result = __sgetc_r (ptr, fp);
  _funlockfile (fp);
  __sfp_lock_release ();
  return result;
}
 
#ifndef _REENT_ONLY
 
int
_DEFUN(getc, (fp),
       register FILE *fp)
{
  int result;
  CHECK_INIT (_REENT, fp);
  __sfp_lock_acquire ();
  _flockfile (fp);
  result = __sgetc_r (_REENT, fp);
  _funlockfile (fp);
  __sfp_lock_release ();
  return result;
}
 
#endif /* !_REENT_ONLY */