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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [stdio/] [getc_u.c] - Blame information for rev 207

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1 207 jeremybenn
/*
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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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<<getc_unlocked>>---non-thread-safe version of getc (macro)
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INDEX
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        getc_unlocked
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INDEX
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        _getc_unlocked_r
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SYNOPSIS
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        #include <stdio.h>
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        int getc_unlocked(FILE *<[fp]>);
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        #include <stdio.h>
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        int _getc_unlocked_r(FILE *<[fp]>);
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DESCRIPTION
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<<getc_unlocked>> is a non-thread-safe version of <<getc>> declared in
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<<stdio.h>>.  <<getc_unlocked>> may only safely be used within a scope
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protected by flockfile() (or ftrylockfile()) and funlockfile().  These
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functions may safely be used in a multi-threaded program if and only
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if they are called while the invoking thread owns the ( FILE *)
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object, as is the case after a successful call to the flockfile() or
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ftrylockfile() functions.  If threads are disabled, then
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<<getc_unlocked>> is equivalent to <<getc>>.
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The <<_getc_unlocked_r>> function is simply the reentrant version of
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<<get_unlocked>> which passes an additional reentrancy structure pointer
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argument: <[ptr]>.
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RETURNS
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See <<getc>>.
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PORTABILITY
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POSIX 1003.1 requires <<getc_unlocked>>.  <<getc_unlocked>> may be
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implemented as a macro, so arguments should not have side-effects.
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Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
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<<lseek>>, <<read>>, <<sbrk>>, <<write>>.  */
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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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#include <_ansi.h>
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#include <stdio.h>
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/*
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 * A subroutine version of the macro getc_unlocked.
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 */
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#undef getc_unlocked
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int
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_DEFUN(_getc_unlocked_r, (ptr, fp),
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       struct _reent *ptr _AND
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       register FILE *fp)
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{
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  /* CHECK_INIT is called (eventually) by __srefill_r.  */
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  return __sgetc_r (ptr, fp);
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}
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#ifndef _REENT_ONLY
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int
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_DEFUN(getc_unlocked, (fp),
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       register FILE *fp)
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{
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  return __sgetc_r (_REENT, fp);
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}
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#endif /* !_REENT_ONLY */

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