412 lines
12 KiB
C
412 lines
12 KiB
C
/***
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*_file.c - Definition of _iob[], initializer and terminator.
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*
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* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Defines _iob[], the array of stdio control structures, the initializer
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* and terminator routines, and the multithread locking for stdio.
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*
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*Revision History:
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* 04-18-84 RN initial version
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* ??-??-?? TC added field _bifsiz to iob2 to allow variable
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* length buffers
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* 10-02-86 SKS _NFILE_ is now different for real-mode and prot-mode
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* _NFILE_ must be defined by compiler -D directory
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* 05-27-87 JCR Protected mode now uses only 3 pre-defined file handles,
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* not 5. Added PM (prot mode) to conditionalize handles.
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* 06-24-87 SKS Make "_bufin[]" and "_bufout[]" near for Compact/Large
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* models (MS real-mode version only)
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* 07-01-87 PHG Changed PM switch to PROTMODE
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* 11-05-87 JCR Added _buferr and modified stderr entry
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* 11-09-87 SKS Removed IBMC20 switch, Changed PROTMODE to OS2
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* 01-04-88 JCR Moved _NFILE_ definition from command line to file
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* 01-11-88 JCR Merged Mthread version into standard version
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* 01-21-88 JCR Removed reference to internal.h and added _NEAR_
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* (thus, internal.h doesn't get released in startup
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* sources even though _file.c does).
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* 06-28-88 JCR Remove static stdout/stderr buffers
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* 07-06-88 JCR Corrected _bufin declaration so it's always in BSS
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* 08-24-88 GJF Added check that OS2 is defined whenever M_I386 is.
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* 06-08-89 GJF Propagated SKS's fix of 02-08-89, and fixed copyright.
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* 07-25-89 GJF Cleanup (deleted DOS specific and OS/2 286 specific
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* stuff). Now specific to the 386.
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* 01-09-90 GJF _iob[], _iob2[] merge. Also, fixed copyright
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* 03-16-90 GJF Added #include <cruntime.h> and removed some (now)
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* useless preprocessor stuff.
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* 03-26-90 GJF Replaced _cdecl with _VARTYPE1.
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* 02-14-92 GJF Replaced _NFILE_ with _NSTREAM_ for Win32, with _NFILE
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* for non-Win32.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 05-11-93 GJF Replaced BUFSIZ with _INTERNAL_BUFSIZ.
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* 04-04-94 GJF #ifndef-ed out for Win32S version of msvcrt*.dll.
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* Also, deleted old conditionals for non-Win32 support.
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* 08-18-94 GJF Moved stdio terminator stuff from fflush.c to here
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* and added an initializer which fixes the _file field
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* of _iob[0], _iob[1] and _iob[2] when the underlying
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* entries in _osfhnd[0], _osfhnd[1], _osfhnd[2] are
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* invalid (0 or -1).
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* 02-17-95 GJF Appended Mac version of source file (somewhat cleaned
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* up), with appropriate #ifdef-s.
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* 03-01-95 GJF Changes to manage streams via __piob[], rather than
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* _iob[].
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* 06-12-95 GJF Replaced _osfhnd[] with _osfhnd() (macro referencing
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* field in ioinfo struct).
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* 06-19-97 GJF Moved _[un]lock_file[2]() here from startup\mlock.c.
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* 02-13-98 GJF Changes for Win32: changed long cast to intptr_t.
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* 04-28-99 PML Wrap __declspec(allocate()) in _CRTALLOC macro.
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* 09-26-97 BWT Fix POSIX
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* 05-17-99 PML Remove all Macintosh support.
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* 01-29-01 GB Added _func function version of data variable used in msvcprt.lib
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* to work with STATIC_CPPLIB
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* 03-27-01 PML .CRT$XI routines must now return 0 or _RT_* fatal
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* error code (vs7#231220)
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*
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*******************************************************************************/
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#include <sect_attribs.h>
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#include <cruntime.h>
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#include <windows.h>
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#include <stdio.h>
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#include <file2.h>
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#include <internal.h>
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#include <malloc.h>
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#include <rterr.h>
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#include <dbgint.h>
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#include <mtdll.h>
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/*
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* Buffer for stdin.
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*/
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char _bufin[_INTERNAL_BUFSIZ];
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/*
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* FILE descriptors; preset for stdin/out/err (note that the __tmpnum field
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* is not initialized)
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*/
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FILE _iob[_IOB_ENTRIES] = {
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/* _ptr, _cnt, _base, _flag, _file, _charbuf, _bufsiz */
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/* stdin (_iob[0]) */
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{ _bufin, 0, _bufin, _IOREAD | _IOYOURBUF, 0, 0, _INTERNAL_BUFSIZ },
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/* stdout (_iob[1]) */
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{ NULL, 0, NULL, _IOWRT, 1, 0, 0 },
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/* stderr (_iob[3]) */
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{ NULL, 0, NULL, _IOWRT, 2, 0, 0 },
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};
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/* These functions are for enabling STATIC_CPPLIB functionality */
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_CRTIMP FILE * __cdecl __iob_func(void)
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{
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return _iob;
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}
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/*
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* Pointer to array of FILE * or _FILEX * structures.
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*/
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void ** __piob;
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/*
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* Number of open streams (set to _NSTREAM by default)
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*/
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#ifdef CRTDLL
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int _nstream = _NSTREAM_;
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#else
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int _nstream;
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#endif
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/*
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* Initializer and terminator for stdio
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*/
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int __cdecl __initstdio(void);
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void __cdecl __endstdio(void);
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#ifdef _MSC_VER
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#pragma data_seg(".CRT$XIC")
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_CRTALLOC(".CRT$XIC") static _PIFV pinit = __initstdio;
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#pragma data_seg(".CRT$XPX")
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_CRTALLOC(".CRT$XPX") static _PVFV pterm = __endstdio;
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#pragma data_seg()
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#endif /* _MSC_VER */
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#ifndef CRTDLL
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/*
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* _cflush is a dummy variable used to pull in _endstdio() when any STDIO
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* routine is included in the user program.
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*/
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int _cflush = 0;
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#endif /* CRTDLL */
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/***
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* __initstdio - Initialize the stdio system
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*
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*Purpose:
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* Create and initialize the __piob array.
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*
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*Entry: <void>
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*
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*Exit: Returns _RT_STDIOINIT if error encountered.
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*
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*Uses:
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*
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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl __initstdio(void)
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{
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int i;
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#ifndef CRTDLL
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/*
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* If the user has not supplied a definition of _nstream, set it
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* to _NSTREAM_. If the user has supplied a value that is too small
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* set _nstream to the minimum acceptable value (_IOB_ENTRIES).
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*/
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if ( _nstream == 0 )
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_nstream = _NSTREAM_;
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else if ( _nstream < _IOB_ENTRIES )
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_nstream = _IOB_ENTRIES;
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#endif
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/*
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* Allocate the __piob array. Try for _nstream entries first. If this
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* fails then reset _nstream to _IOB_ENTRIES and try again. If it
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* still fails, bail out with an RTE.
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*/
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if ( (__piob = (void **)_calloc_crt( _nstream, sizeof(void *) )) ==
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NULL ) {
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_nstream = _IOB_ENTRIES;
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if ( (__piob = (void **)_calloc_crt( _nstream, sizeof(void *) ))
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== NULL )
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return _RT_STDIOINIT;
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}
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/*
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* Initialize the first _IOB_ENTRIES to point to the corresponding
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* entries in _iob[].
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*/
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for ( i = 0 ; i < _IOB_ENTRIES ; i++ )
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__piob[i] = (void *)&_iob[i];
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#ifndef _POSIX_
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for ( i = 0 ; i < 3 ; i++ ) {
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if ( (_osfhnd(i) == (intptr_t)INVALID_HANDLE_VALUE) ||
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(_osfhnd(i) == 0) )
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{
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_iob[i]._file = -1;
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}
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}
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#endif
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return 0;
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}
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/***
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* __endstdio - Terminate the stdio system
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*
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*Purpose:
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* Terminate the stdio system
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*
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* (1) Flush all streams. (Do this even if we're going to
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* call fcloseall since that routine won't do anything to the
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* std streams.)
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*
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* (2) If returning to caller, close all streams. This is
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* not necessary if the exe is terminating because the OS will
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* close the files for us (much more efficiently, too).
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*
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*Entry: <void>
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*
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*Exit: <void>
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*
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*Uses:
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*
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*Exceptions:
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*
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*******************************************************************************/
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void __cdecl __endstdio(void)
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{
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/* flush all streams */
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_flushall();
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/* if in callable exit, close all streams */
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if (_exitflag)
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_fcloseall();
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}
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#ifdef _MT
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/***
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* _lock_file - Lock a FILE
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*
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*Purpose:
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* Assert the lock for a stdio-level file
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*
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*Entry:
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* pf = __piob[] entry (pointer to a FILE or _FILEX)
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*
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*Exit:
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*
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*Exceptions:
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*
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*******************************************************************************/
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void __cdecl _lock_file (
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void *pf
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)
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{
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/*
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* The way the FILE (pointed to by pf) is locked depends on whether
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* it is part of _iob[] or not
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*/
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if ( (pf >= (void *)_iob) && (pf <= (void *)(&_iob[_IOB_ENTRIES-1])) )
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/*
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* FILE lies in _iob[] so the lock lies in _locktable[].
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*/
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_lock( _STREAM_LOCKS + (int)((FILE *)pf - _iob) );
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else
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/*
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* Not part of _iob[]. Therefore, *pf is a _FILEX and the
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* lock field of the struct is an initialized critical
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* section.
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*/
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EnterCriticalSection( &(((_FILEX *)pf)->lock) );
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}
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/***
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* _lock_file2(i, s) - Lock the FILE
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*
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*Purpose:
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* Assert the lock for a stdio-level file given by s == __piob[i].
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*
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*Entry:
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* s == __piob[i]
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*
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*Exit:
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*
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*Exceptions:
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*
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*******************************************************************************/
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void __cdecl _lock_file2 (
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int i,
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void *s
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)
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{
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/*
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* The way the FILE is locked depends on whether it is part of _iob[]
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* _iob[] or not
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*/
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if ( i < _IOB_ENTRIES )
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/*
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* FILE lies in _iob[] so the lock lies in _locktable[].
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*/
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_lock( _STREAM_LOCKS + i );
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else
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/*
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* Not part of _iob[]. Therefore, *s is a _FILEX and the
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* lock field of the struct is an initialized critical
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* section.
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*/
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EnterCriticalSection( &(((_FILEX *)s)->lock) );
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}
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/***
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* _unlock_file - Unlock a FILE
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*
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*Purpose:
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* Release the lock for a stdio-level file
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*
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*Entry:
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* pf = __piob[] entry (pointer to a FILE or _FILEX)
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*
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*Exit:
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*
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*Exceptions:
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*
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*******************************************************************************/
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void __cdecl _unlock_file (
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void *pf
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)
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{
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/*
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* The way the FILE (pointed to by pf) is unlocked depends on whether
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* it is part of _iob[] or not
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*/
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if ( (pf >= (void *)_iob) && (pf <= (void *)(&_iob[_IOB_ENTRIES-1])) )
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/*
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* FILE lies in _iob[] so the lock lies in _locktable[].
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*/
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_unlock( _STREAM_LOCKS + (int)((FILE *)pf - _iob) );
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else
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/*
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* Not part of _iob[]. Therefore, *pf is a _FILEX and the
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* lock field of the struct is an initialized critical
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* section.
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*/
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LeaveCriticalSection( &(((_FILEX *)pf)->lock) );
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}
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/***
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* _unlock_file2(i, s) - Lock the FILE
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*
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*Purpose:
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* Release the lock for a stdio-level file given by s == __piob[i].
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*
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*Entry:
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* s == __piob[i]
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*
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*Exit:
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*
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*Exceptions:
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*
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*******************************************************************************/
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void __cdecl _unlock_file2 (
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int i,
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void *s
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)
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{
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/*
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* The way the FILE is locked depends on whether it is part of _iob[]
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* _iob[] or not
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*/
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if ( i < _IOB_ENTRIES )
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/*
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* FILE lies in _iob[] so the lock lies in _locktable[].
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*/
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_unlock( _STREAM_LOCKS + i );
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else
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/*
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* Not part of _iob[]. Therefore, *s is a _FILEX and the
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* lock field of the struct is an initialized critical
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* section.
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*/
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LeaveCriticalSection( &(((_FILEX *)s)->lock) );
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}
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#endif /* _MT */
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