498 lines
20 KiB
C
498 lines
20 KiB
C
/*
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Copyright (C) 1993 Free Software Foundation
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This file is part of the GNU IO Library. This library is free
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software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option)
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any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this library; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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As a special exception, if you link this library with files
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compiled with a GNU compiler to produce an executable, this does not cause
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the resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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#include <errno.h>
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#ifndef errno
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extern int errno;
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#endif
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#include "iolibio.h"
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#if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(__cplusplus)
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/* All known AIX compilers implement these things (but don't always
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define __STDC__). The RISC/OS MIPS compiler defines these things
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in SVR4 mode, but does not define __STDC__. */
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#define AND ,
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#define DEFUN(name, arglist, args) name(args)
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#define DEFUN_VOID(name) name(void)
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#else /* Not ANSI C. */
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#define AND ;
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#ifndef const /* some systems define it in header files for non-ansi mode */
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#define const
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#endif
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#define DEFUN(name, arglist, args) name arglist args;
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#define DEFUN_VOID(name) name()
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#endif /* ANSI C. */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define _IO_seek_set 0
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#define _IO_seek_cur 1
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#define _IO_seek_end 2
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/* THE JUMPTABLE FUNCTIONS.
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* The _IO_FILE type is used to implement the FILE type in GNU libc,
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* as well as the streambuf class in GNU iostreams for C++.
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* These are all the same, just used differently.
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* An _IO_FILE (or FILE) object is allows followed by a pointer to
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* a jump table (of pointers to functions). The pointer is accessed
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* with the _IO_JUMPS macro. The jump table has a eccentric format,
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* so as to be compatible with the layout of a C++ virtual function table.
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* (as implemented by g++). When a pointer to a steambuf object is
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* coerced to an (_IO_FILE*), then _IO_JUMPS on the result just
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* happens to point to the virtual function table of the streambuf.
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* Thus the _IO_JUMPS function table used for C stdio/libio does
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* double duty as the virtual functiuon table for C++ streambuf.
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*
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* The entries in the _IO_JUMPS function table (and hence also the
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* virtual functions of a streambuf) are described below.
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* The first parameter of each function entry is the _IO_FILE/streambuf
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* object being acted on (i.e. the 'this' parameter).
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*/
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#define _IO_JUMPS(THIS) ((struct _IO_FILE_plus*)(THIS))->vtable
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#ifdef _G_USING_THUNKS
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#define JUMP_FIELD(TYPE, NAME) TYPE NAME
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#define JUMP0(FUNC, THIS) _IO_JUMPS(THIS)->FUNC(THIS)
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#define JUMP1(FUNC, THIS, X1) _IO_JUMPS(THIS)->FUNC(THIS, X1)
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#define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS(THIS)->FUNC(THIS, X1, X2)
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#define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS(THIS)->FUNC(THIS, X1,X2, X3)
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#define JUMP_INIT(NAME, VALUE) VALUE
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#define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0), JUMP_INIT(dummy2, 0)
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#else
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/* These macros will change when we re-implement vtables to use "thunks"! */
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#define JUMP_FIELD(TYPE, NAME) struct { short delta1, delta2; TYPE pfn; } NAME
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#define JUMP0(FUNC, THIS) _IO_JUMPS(THIS)->FUNC.pfn(THIS)
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#define JUMP1(FUNC, THIS, X1) _IO_JUMPS(THIS)->FUNC.pfn(THIS, X1)
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#define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS(THIS)->FUNC.pfn(THIS, X1, X2)
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#define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS(THIS)->FUNC.pfn(THIS, X1,X2, X3)
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#define JUMP_INIT(NAME, VALUE) {0, 0, VALUE}
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#define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0)
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#endif
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/* The 'finish' function does any final cleaning up of an _IO_FILE object.
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It does not delete (free) it, but does everything else to finalize it/
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It matches the streambuf::~streambuf virtual destructor. */
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typedef void (*_IO_finish_t) __P((_IO_FILE*)); /* finalize */
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#define _IO_FINISH(FP) JUMP0(__finish, FP)
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/* The 'overflow' hook flushes the buffer.
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The second argument is a character, or EOF.
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It matches the streambuf::overflow virtual function. */
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typedef int (*_IO_overflow_t) __P((_IO_FILE*, int));
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#define _IO_OVERFLOW(FP, CH) JUMP1(__overflow, FP, CH)
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/* The 'underflow' hook tries to fills the get buffer.
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It returns the next character (as an unsigned char) or EOF. The next
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character remains in the get buffer, and the get postion is not changed.
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It matches the streambuf::underflow virtual function. */
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typedef int (*_IO_underflow_t) __P((_IO_FILE*));
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#define _IO_UNDERFLOW(FP) JUMP0(__underflow, FP)
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/* The 'uflow' hook returns the next character in the input stream
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(cast to unsigned char), and increments the read position;
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EOF is returned on failure.
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It matches the streambuf::uflow virtual function, which is not in the
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cfront implementation, but was added to C++ by the ANSI/ISO committee. */
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#define _IO_UFLOW(FP) JUMP0(__uflow, FP)
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/* The 'pbackfail' hook handles backing up.
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It matches the streambuf::pbackfail virtual function. */
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typedef int (*_IO_pbackfail_t) __P((_IO_FILE*, int));
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#define _IO_PBACKFAIL(FP, CH) JUMP1(__pbackfail, FP, CH)
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/* The 'xsputn' hook writes upto N characters from buffer DATA.
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Returns the number of character actually written.
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It matches the streambuf::xsputn virtual function. */
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typedef _IO_size_t (*_IO_xsputn_t)
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__P((_IO_FILE *FP, const void *DATA, _IO_size_t N));
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#define _IO_XSPUTN(FP, DATA, N) JUMP2(__xsputn, FP, DATA, N)
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/* The 'xsgetn' hook reads upto N characters into buffer DATA.
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Returns the number of character actually read.
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It matches the streambuf::xsgetn virtual function. */
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typedef _IO_size_t (*_IO_xsgetn_t) __P((_IO_FILE*FP, void*DATA, _IO_size_t N));
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#define _IO_XSGETN(FP, DATA, N) JUMP2(__xsgetn, FP, DATA, N)
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/* The 'seekoff' hook moves the stream position to a new position
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relative to the start of the file (if DIR==0), the current position
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(MODE==1), or the end of the file (MODE==2).
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It matches the streambuf::seekoff virtual function.
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It is also used for the ANSI fseek function. */
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typedef _IO_fpos_t (*_IO_seekoff_t)
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__P((_IO_FILE* FP, _IO_off_t OFF, int DIR, int MODE));
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#define _IO_SEEKOFF(FP, OFF, DIR, MODE) JUMP3(__seekoff, FP, OFF, DIR, MODE)
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/* The 'seekpos' hook also moves the stream position,
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but to an absolute position given by a fpos_t (seekpos).
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It matches the streambuf::seekpos virtual function.
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It is also used for the ANSI fgetpos and fsetpos functions. */
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/* The _IO_seek_cur and _IO_seek_end options are not allowed. */
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typedef _IO_fpos_t (*_IO_seekpos_t) __P((_IO_FILE*, _IO_fpos_t, int));
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#define _IO_SEEKPOS(FP, POS, FLAGS) JUMP2(__seekpos, FP, POS, FLAGS)
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/* The 'setbuf' hook gives a buffer to the file.
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It matches the streambuf::setbuf virtual function. */
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typedef _IO_FILE* (*_IO_setbuf_t) __P((_IO_FILE*, char *, _IO_ssize_t));
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#define _IO_SETBUF(FP, BUFFER, LENGTH) JUMP2(__setbuf, FP, BUFFER, LENGTH)
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/* The 'sync' hook attempts to synchronize the internal data structures
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of the file with the external state.
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It matches the streambuf::sync virtual function. */
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typedef int (*_IO_sync_t) __P((_IO_FILE*));
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#define _IO_SYNC(FP) JUMP0(__sync, FP)
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/* The 'doallocate' hook is used to tell the file to allocate a buffer.
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It matches the streambuf::doallocate virtual function, which is not
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in the ANSI/ISO C++ standard, but is part traditional implementations. */
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typedef int (*_IO_doallocate_t) __P((_IO_FILE*));
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#define _IO_DOALLOCATE(FP) JUMP0(__doallocate, FP)
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/* The following four hooks (sysread, syswrite, sysclose, sysseek, and
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sysstat) are low-level hooks specific to this implementation.
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There is no correspondance in the ANSI/ISO C++ standard library.
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The hooks basically correspond to the Unix system functions
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(read, write, close, lseek, and stat) except that a _IO_FILE*
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parameter is used instead of a integer file descriptor; the default
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implementation used for normal files just calls those functions.
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The advantage of overriding these functions instead of the higher-level
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ones (underflow, overflow etc) is that you can leave all the buffering
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higher-level functions. */
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/* The 'sysread' hook is used to read data from the external file into
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an existing buffer. It generalizes the Unix read(2) function.
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It matches the streambuf::sys_read virtual function, which is
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specific to this implementaion. */
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typedef _IO_ssize_t (*_IO_read_t) __P((_IO_FILE*, void*, _IO_ssize_t));
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#define _IO_SYSREAD(FP, DATA, LEN) JUMP2(__read, FP, DATA, LEN)
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/* The 'syswrite' hook is used to write data from an existing buffer
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to an external file. It generalizes the Unix write(2) function.
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It matches the streambuf::sys_write virtual function, which is
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specific to this implementaion. */
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typedef _IO_ssize_t (*_IO_write_t) __P((_IO_FILE*,const void*,_IO_ssize_t));
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#define _IO_SYSWRITE(FP, DATA, LEN) JUMP2(__write, FP, DATA, LEN)
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/* The 'sysseek' hook is used to re-position an external file.
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It generalizes the Unix lseek(2) function.
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It matches the streambuf::sys_seek virtual function, which is
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specific to this implementaion. */
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typedef _IO_fpos_t (*_IO_seek_t) __P((_IO_FILE*, _IO_off_t, int));
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#define _IO_SYSSEEK(FP, OFFSET, MODE) JUMP2(__seek, FP, OFFSET, MODE)
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/* The 'sysclose' hook is used to finalize (close, finish up) an
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external file. It generalizes the Unix close(2) function.
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It matches the streambuf::sys_close virtual function, which is
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specific to this implementation. */
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typedef int (*_IO_close_t) __P((_IO_FILE*)); /* finalize */
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#define _IO_SYSCLOSE(FP) JUMP0(__close, FP)
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/* The 'sysstat' hook is used to get information about an external file
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into a struct stat buffer. It generalizes the Unix fstat(2) call.
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It matches the streambuf::sys_stat virtual function, which is
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specific to this implementaion. */
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typedef int (*_IO_stat_t) __P((_IO_FILE*, void*));
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#define _IO_SYSSTAT(FP, BUF) JUMP1(__stat, FP, BUF)
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#define _IO_CHAR_TYPE char /* unsigned char ? */
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#define _IO_INT_TYPE int
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struct _IO_jump_t {
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JUMP_FIELD(_G_size_t, __dummy);
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#ifdef _G_USING_THUNKS
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JUMP_FIELD(_G_size_t, __dummy2);
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#endif
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JUMP_FIELD(_IO_finish_t, __finish);
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JUMP_FIELD(_IO_overflow_t, __overflow);
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JUMP_FIELD(_IO_underflow_t, __underflow);
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JUMP_FIELD(_IO_underflow_t, __uflow);
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JUMP_FIELD(_IO_pbackfail_t, __pbackfail);
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/* showmany */
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JUMP_FIELD(_IO_xsputn_t, __xsputn);
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JUMP_FIELD(_IO_xsgetn_t, __xsgetn);
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JUMP_FIELD(_IO_seekoff_t, __seekoff);
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JUMP_FIELD(_IO_seekpos_t, __seekpos);
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JUMP_FIELD(_IO_setbuf_t, __setbuf);
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JUMP_FIELD(_IO_sync_t, __sync);
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JUMP_FIELD(_IO_doallocate_t, __doallocate);
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JUMP_FIELD(_IO_read_t, __read);
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JUMP_FIELD(_IO_write_t, __write);
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JUMP_FIELD(_IO_seek_t, __seek);
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JUMP_FIELD(_IO_close_t, __close);
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JUMP_FIELD(_IO_stat_t, __stat);
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#if 0
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get_column;
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set_column;
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#endif
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};
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/* We always allocate an extra word following an _IO_FILE.
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This contains a pointer to the function jump table used.
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This is for compatibility with C++ streambuf; the word can
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be used to smash to a pointer to a virtual function table. */
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struct _IO_FILE_plus {
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_IO_FILE file;
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const struct _IO_jump_t *vtable;
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};
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/* Generic functions */
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extern int _IO_switch_to_get_mode __P((_IO_FILE*));
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extern void _IO_init __P((_IO_FILE*, int));
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extern int _IO_sputbackc __P((_IO_FILE*, int));
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extern int _IO_sungetc __P((_IO_FILE*));
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extern void _IO_un_link __P((_IO_FILE*));
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extern void _IO_link_in __P((_IO_FILE *));
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extern void _IO_doallocbuf __P((_IO_FILE*));
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extern void _IO_unsave_markers __P((_IO_FILE*));
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extern void _IO_setb __P((_IO_FILE*, char*, char*, int));
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extern unsigned _IO_adjust_column __P((unsigned, const char *, int));
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#define _IO_sputn(__fp, __s, __n) _IO_XSPUTN(__fp, __s, __n)
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/* Marker-related function. */
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extern void _IO_init_marker __P((struct _IO_marker *, _IO_FILE *));
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extern void _IO_remove_marker __P((struct _IO_marker*));
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extern int _IO_marker_difference __P((struct _IO_marker *, struct _IO_marker *));
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extern int _IO_marker_delta __P((struct _IO_marker *));
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extern int _IO_seekmark __P((_IO_FILE *, struct _IO_marker *, int));
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/* Default jumptable functions. */
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extern int _IO_default_underflow __P((_IO_FILE*));
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extern int _IO_default_uflow __P((_IO_FILE*));
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extern int _IO_default_doallocate __P((_IO_FILE*));
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extern void _IO_default_finish __P((_IO_FILE *));
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extern int _IO_default_pbackfail __P((_IO_FILE*, int));
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extern _IO_FILE* _IO_default_setbuf __P((_IO_FILE *, char*, _IO_ssize_t));
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extern _IO_size_t _IO_default_xsputn __P((_IO_FILE *, const void*, _IO_size_t));
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extern _IO_size_t _IO_default_xsgetn __P((_IO_FILE *, void*, _IO_size_t));
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extern _IO_fpos_t _IO_default_seekoff __P((_IO_FILE*, _IO_off_t, int, int));
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extern _IO_fpos_t _IO_default_seekpos __P((_IO_FILE*, _IO_fpos_t, int));
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extern _IO_ssize_t _IO_default_write __P((_IO_FILE*,const void*,_IO_ssize_t));
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extern _IO_ssize_t _IO_default_read __P((_IO_FILE*, void*, _IO_ssize_t));
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extern int _IO_default_stat __P((_IO_FILE*, void*));
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extern _IO_fpos_t _IO_default_seek __P((_IO_FILE*, _IO_off_t, int));
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extern int _IO_default_sync __P((_IO_FILE*));
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#define _IO_default_close ((_IO_close_t)_IO_default_sync)
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extern struct _IO_jump_t _IO_file_jumps;
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extern struct _IO_jump_t _IO_streambuf_jumps;
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extern struct _IO_jump_t _IO_proc_jumps;
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extern struct _IO_jump_t _IO_str_jumps;
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extern int _IO_do_write __P((_IO_FILE*, const char*, _IO_size_t));
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extern int _IO_flush_all __P((void));
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extern void _IO_cleanup __P((void));
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extern void _IO_flush_all_linebuffered __P((void));
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#define _IO_do_flush(_f) \
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_IO_do_write(_f, (_f)->_IO_write_base, \
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(_f)->_IO_write_ptr-(_f)->_IO_write_base)
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#define _IO_in_put_mode(_fp) ((_fp)->_flags & _IO_CURRENTLY_PUTTING)
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#define _IO_mask_flags(fp, f, mask) \
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((fp)->_flags = ((fp)->_flags & ~(mask)) | ((f) & (mask)))
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#define _IO_setg(fp, eb, g, eg) ((fp)->_IO_read_base = (eb),\
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(fp)->_IO_read_ptr = (g), (fp)->_IO_read_end = (eg))
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#define _IO_setp(__fp, __p, __ep) \
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((__fp)->_IO_write_base = (__fp)->_IO_write_ptr = __p, (__fp)->_IO_write_end = (__ep))
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#define _IO_have_backup(fp) ((fp)->_IO_save_base != NULL)
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#define _IO_in_backup(fp) ((fp)->_flags & _IO_IN_BACKUP)
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#define _IO_have_markers(fp) ((fp)->_markers != NULL)
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#define _IO_blen(fp) ((fp)->_IO_buf_end - (fp)->_IO_buf_base)
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/* Jumptable functions for files. */
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extern int _IO_file_doallocate __P((_IO_FILE*));
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extern _IO_FILE* _IO_file_setbuf __P((_IO_FILE *, char*, _IO_ssize_t));
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extern _IO_fpos_t _IO_file_seekoff __P((_IO_FILE*, _IO_off_t, int, int));
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extern _IO_size_t _IO_file_xsputn __P((_IO_FILE*,const void*,_IO_size_t));
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extern int _IO_file_stat __P((_IO_FILE*, void*));
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extern int _IO_file_close __P((_IO_FILE*));
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extern int _IO_file_underflow __P((_IO_FILE *));
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extern int _IO_file_overflow __P((_IO_FILE *, int));
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#define _IO_file_is_open(__fp) ((__fp)->_fileno >= 0)
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extern void _IO_file_init __P((_IO_FILE*));
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extern _IO_FILE* _IO_file_fopen __P((_IO_FILE*, const char*, const char*));
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extern _IO_ssize_t _IO_file_write __P((_IO_FILE*,const void*,_IO_ssize_t));
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extern _IO_ssize_t _IO_file_read __P((_IO_FILE*, void*, _IO_ssize_t));
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extern int _IO_file_sync __P((_IO_FILE*));
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extern int _IO_file_close_it __P((_IO_FILE*));
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extern _IO_fpos_t _IO_file_seek __P((_IO_FILE *, _IO_off_t, int));
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extern void _IO_file_finish __P((_IO_FILE*));
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/* Other file functions. */
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extern _IO_FILE* _IO_file_attach __P((_IO_FILE *, int));
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/* Jumptable functions for proc_files. */
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extern _IO_FILE* _IO_proc_open __P((_IO_FILE*, const char*, const char *));
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extern int _IO_proc_close __P((_IO_FILE*));
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/* Jumptable functions for strfiles. */
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extern int _IO_str_underflow __P((_IO_FILE*));
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extern int _IO_str_overflow __P((_IO_FILE *, int));
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extern int _IO_str_pbackfail __P((_IO_FILE*, int));
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extern _IO_fpos_t _IO_str_seekoff __P((_IO_FILE*,_IO_off_t,int,int));
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/* Other strfile functions */
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extern void _IO_str_init_static __P((_IO_FILE *, char*, int, char*));
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extern void _IO_str_init_readonly __P((_IO_FILE *, const char*, int));
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extern _IO_ssize_t _IO_str_count __P ((_IO_FILE*));
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extern _IO_size_t _IO_getline __P((_IO_FILE*,char*,_IO_size_t,int,int));
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extern _IO_ssize_t _IO_getdelim __P((char**, _IO_size_t*, int, _IO_FILE*));
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extern double _IO_strtod __P((const char *, char **));
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extern char * _IO_dtoa __P((double __d, int __mode, int __ndigits,
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int *__decpt, int *__sign, char **__rve));
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extern int _IO_outfloat __P((double __value, _IO_FILE *__sb, int __type,
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int __width, int __precision, int __flags,
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int __sign_mode, int __fill));
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extern _IO_FILE *_IO_list_all;
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extern void (*_IO_cleanup_registration_needed) __P ((void));
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#ifndef EOF
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#define EOF (-1)
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#endif
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#ifndef NULL
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#ifdef __GNUG__
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#define NULL (__null)
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#else
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#if !defined(__cplusplus)
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#define NULL ((void*)0)
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#else
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#define NULL (0)
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#endif
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#endif
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#endif
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#define FREE_BUF(_B) free(_B)
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#define ALLOC_BUF(_S) (char*)malloc(_S)
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#ifndef OS_FSTAT
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#define OS_FSTAT fstat
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#endif
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struct stat;
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extern _IO_ssize_t _IO_read __P((int, void*, _IO_size_t));
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extern _IO_ssize_t _IO_write __P((int, const void*, _IO_size_t));
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extern _IO_off_t _IO_lseek __P((int, _IO_off_t, int));
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extern int _IO_close __P((int));
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extern int _IO_fstat __P((int, struct stat *));
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/* Operations on _IO_fpos_t.
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Normally, these are trivial, but we provide hooks for configurations
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where an _IO_fpos_t is a struct.
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Note that _IO_off_t must be an integral type. */
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/* _IO_pos_BAD is an _IO_fpos_t value indicating error, unknown, or EOF. */
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#ifndef _IO_pos_BAD
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#define _IO_pos_BAD ((_IO_fpos_t)(-1))
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#endif
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/* _IO_pos_as_off converts an _IO_fpos_t value to an _IO_off_t value. */
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#ifndef _IO_pos_as_off
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#define _IO_pos_as_off(__pos) ((_IO_off_t)(__pos))
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#endif
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/* _IO_pos_adjust adjust an _IO_fpos_t by some number of bytes. */
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#ifndef _IO_pos_adjust
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#define _IO_pos_adjust(__pos, __delta) ((__pos) += (__delta))
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#endif
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/* _IO_pos_0 is an _IO_fpos_t value indicating beginning of file. */
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#ifndef _IO_pos_0
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#define _IO_pos_0 ((_IO_fpos_t)0)
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#endif
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#ifdef __cplusplus
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}
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#endif
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/* check following! */
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#define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
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{ _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD}
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/* VTABLE_LABEL defines NAME as of the CLASS class.
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CNLENGTH is strlen(#CLASS). */
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#ifdef __GNUC__
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#if _G_VTABLE_LABEL_HAS_LENGTH
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#define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
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extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CNLENGTH #CLASS);
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#else
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#define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
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extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CLASS);
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#endif
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#endif /* __GNUC__ */
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#if !defined(builtinbuf_vtable) && defined(__cplusplus)
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#ifdef __GNUC__
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VTABLE_LABEL(builtinbuf_vtable, builtinbuf, 10)
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#else
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#if _G_VTABLE_LABEL_HAS_LENGTH
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#define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##10builtinbuf
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#else
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#define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##builtinbuf
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#endif
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#endif
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#endif /* !defined(builtinbuf_vtable) && defined(__cplusplus) */
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#if defined(__STDC__) || defined(__cplusplus)
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#define _IO_va_start(args, last) va_start(args, last)
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#else
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#define _IO_va_start(args, last) va_start(args)
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#endif
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extern struct _IO_fake_stdiobuf _IO_stdin_buf, _IO_stdout_buf, _IO_stderr_buf;
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#if 1
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#define COERCE_FILE(FILE) /* Nothing */
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#else
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/* This is part of the kludge for binary compatibility with old stdio. */
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#define COERCE_FILE(FILE) \
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(((FILE)->_IO_file_flags & _IO_MAGIC_MASK) == _OLD_MAGIC_MASK \
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&& (FILE) = *(FILE**)&((int*)fp)[1])
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#endif
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#ifdef EINVAL
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#define MAYBE_SET_EINVAL errno = EINVAL
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#else
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#define MAYBE_SET_EINVAL /* nothing */
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#endif
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#ifdef DEBUG
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#define CHECK_FILE(FILE,RET) \
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if ((FILE) == NULL) { MAYBE_SET_EINVAL; return RET; } \
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else { COERCE_FILE(FILE); \
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if (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) != _IO_MAGIC) \
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{ errno = EINVAL; return RET; }}
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#else
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#define CHECK_FILE(FILE,RET) \
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COERCE_FILE(FILE)
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#endif
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