120 lines
3.3 KiB
C
120 lines
3.3 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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<<fgetc>>, <<fgetc_unlocked>>---get a character from a file or stream
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INDEX
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fgetc
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INDEX
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fgetc_unlocked
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INDEX
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_fgetc_r
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INDEX
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_fgetc_unlocked_r
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SYNOPSIS
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#include <stdio.h>
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int fgetc(FILE *<[fp]>);
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#define _BSD_SOURCE
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#include <stdio.h>
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int fgetc_unlocked(FILE *<[fp]>);
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#include <stdio.h>
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int _fgetc_r(struct _reent *<[ptr]>, FILE *<[fp]>);
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#define _BSD_SOURCE
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#include <stdio.h>
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int _fgetc_unlocked_r(struct _reent *<[ptr]>, FILE *<[fp]>);
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DESCRIPTION
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Use <<fgetc>> to get the next single character from the file or stream
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identified by <[fp]>. As a side effect, <<fgetc>> advances the file's
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current position indicator.
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For a macro version of this function, see <<getc>>.
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<<fgetc_unlocked>> is a non-thread-safe version of <<fgetc>>.
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<<fgetc_unlocked>> may only safely be used within a scope
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protected by flockfile() (or ftrylockfile()) and funlockfile(). This
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function 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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<<fgetc_unlocked>> is equivalent to <<fgetc>>.
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The functions <<_fgetc_r>> and <<_fgetc_unlocked_r>> are simply reentrant
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versions that are passed the additional reentrant structure pointer
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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, <<fgetc>> 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 <<fgetc>>.
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<<fgetc_unlocked>> is a BSD extension also provided by GNU libc.
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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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#include <_ansi.h>
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#include <stdio.h>
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#include "local.h"
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int
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_fgetc_r (struct _reent * ptr,
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FILE * fp)
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{
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int result;
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CHECK_INIT(ptr, fp);
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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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fgetc (FILE * fp)
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{
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#if !defined(PREFER_SIZE_OVER_SPEED) && !defined(__OPTIMIZE_SIZE__)
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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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_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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#else
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return _fgetc_r (_REENT, fp);
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#endif
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}
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#endif /* !_REENT_ONLY */
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