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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

<<getchar>>---read a character (macro)

INDEX

        getchar

INDEX

        _getchar_r

ANSI_SYNOPSIS

        #include <stdio.h>

        int getchar(void);

        int _getchar_r(struct _reent *<[reent]>);

TRAD_SYNOPSIS

        #include <stdio.h>

        int getchar();

        int _getchar_r(<[reent]>)

        char * <[reent]>;

DESCRIPTION

<<getchar>> is a macro, defined in <<stdio.h>>.  You can use <<getchar>>

to get the next single character from the standard input stream.

As a side effect, <<getchar>> advances the standard input's

current position indicator.

The alternate function <<_getchar_r>> is a reentrant version.  The

extra argument <[reent]> is a pointer to a reentrancy structure.

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, <<getchar>> returns <<EOF>>.

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

using `<<ferror(stdin)>>' and `<<feof(stdin)>>'.

PORTABILITY

ANSI C requires <<getchar>>; it suggests, but does not require, that

<<getchar>> be implemented as a macro.

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 */

/*

 * A subroutine version of the macro getchar.

 */

#include <_ansi.h>

#include <reent.h>

#include <stdio.h>

#include "local.h"

#undef getchar

int

_DEFUN(_getchar_r, (reent),

       struct _reent *reent)

{

  _REENT_SMALL_CHECK_INIT (reent);

  return _getc_r (reent, _stdin_r (reent));

}

#ifndef _REENT_ONLY

int

_DEFUN_VOID(getchar)

{

  /* CHECK_INIT is called (eventually) by __srefill_r.  */

  _REENT_SMALL_CHECK_INIT (_REENT);

  return _getc_r (_REENT, _stdin_r (_REENT));

}

#endif