112 lines
3.0 KiB
C
112 lines
3.0 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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* and/or 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>>---read a character (macro)
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INDEX
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getc
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INDEX
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_getc_r
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SYNOPSIS
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#include <stdio.h>
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int getc(FILE *<[fp]>);
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#include <stdio.h>
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int _getc_r(struct _reent *<[ptr]>, FILE *<[fp]>);
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DESCRIPTION
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<<getc>> is a macro, defined in <<stdio.h>>. You can use <<getc>>
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to get the next single character from the file or stream
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identified by <[fp]>. As a side effect, <<getc>> advances the file's
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current position indicator.
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For a subroutine version of this macro, see <<fgetc>>.
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The <<_getc_r>> function is simply the reentrant version of <<getc>>
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which passes an additional reentrancy structure pointer argument: <[ptr]>.
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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, <<getc>> returns <<EOF>>.
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You can distinguish the two situations that cause an <<EOF>> result by
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using the <<ferror>> and <<feof>> functions.
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PORTABILITY
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ANSI C requires <<getc>>; it suggests, but does not require, that
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<<getc>> be implemented as a macro. The standard explicitly permits
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macro implementations of <<getc>> to use the argument more than once;
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therefore, in a portable program, you should not use an expression
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with side effects as the <<getc>> argument.
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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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#include <_ansi.h>
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#include <stdio.h>
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#include "local.h"
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/*
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* A subroutine version of the macro getc.
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*/
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#undef getc
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int
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_getc_r (struct _reent *ptr,
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register FILE *fp)
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{
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int result;
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CHECK_INIT (ptr, fp);
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if (ORIENT (fp, -1) != -1)
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return EOF;
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_newlib_flockfile_start (fp);
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result = __sgetc_r (ptr, fp);
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_newlib_flockfile_end (fp);
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return result;
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}
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#ifndef _REENT_ONLY
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int
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getc (register FILE *fp)
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{
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int result;
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struct _reent *reent = _REENT;
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CHECK_INIT (reent, fp);
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if (ORIENT (fp, -1) != -1)
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return EOF;
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_newlib_flockfile_start (fp);
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result = __sgetc_r (reent, fp);
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_newlib_flockfile_end (fp);
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return result;
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}
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#endif /* !_REENT_ONLY */
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