102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/*
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/*
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FUNCTION
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<<getchar>>---read a character (macro)
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INDEX
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getchar
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INDEX
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_getchar_r
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ANSI_SYNOPSIS
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#include <stdio.h>
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int getchar(void);
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int _getchar_r(struct _reent *<[reent]>);
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TRAD_SYNOPSIS
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#include <stdio.h>
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int getchar();
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int _getchar_r(<[reent]>)
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char * <[reent]>;
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DESCRIPTION
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<<getchar>> is a macro, defined in <<stdio.h>>. You can use <<getchar>>
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to get the next single character from the standard input stream.
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As a side effect, <<getchar>> advances the standard input's
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current position indicator.
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The alternate function <<_getchar_r>> is a reentrant version. The
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extra argument <[reent]> is a pointer to a reentrancy structure.
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RETURNS
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The next character (read as an <<unsigned char>>, and cast to
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<<int>>), unless there is no more data, or the host system reports a
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read error; in either of these situations, <<getchar>> returns <<EOF>>.
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You can distinguish the two situations that cause an <<EOF>> result by
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using `<<ferror(stdin)>>' and `<<feof(stdin)>>'.
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PORTABILITY
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ANSI C requires <<getchar>>; it suggests, but does not require, that
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<<getchar>> be implemented as a macro.
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Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
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<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "%W% (Berkeley) %G%";
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#endif /* LIBC_SCCS and not lint */
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/*
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* A subroutine version of the macro getchar.
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*/
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#include <_ansi.h>
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#include <reent.h>
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#include <stdio.h>
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#include "local.h"
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#undef getchar
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int
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_DEFUN(_getchar_r, (reent),
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struct _reent *reent)
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{
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_REENT_SMALL_CHECK_INIT (reent);
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return _getc_r (reent, _stdin_r (reent));
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}
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#ifndef _REENT_ONLY
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int
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_DEFUN_VOID(getchar)
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{
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struct _reent *reent = _REENT;
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/* CHECK_INIT is called (eventually) by __srefill_r. */
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_REENT_SMALL_CHECK_INIT (reent);
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return _getc_r (reent, _stdin_r (reent));
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}
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#endif
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