122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
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/***
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*freopen.c - close a stream and assign it to a new file
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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 freopen() - close and reopen file, typically used to redirect
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* stdin/out/err/prn/aux.
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*
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*Revision History:
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* 09-02-83 RN initial version
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* 04-13-87 JCR added const to declarations
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* 11-02-87 JCR Multi-thread support
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* 12-11-87 JCR Added "_LOAD_DS" to declaration
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* 05-27-88 PHG Merged DLL and normal versions
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* 06-15-88 JCR Near reference to _iob[] entries; improve REG variables
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* 08-25-88 GJF Don't use FP_OFF() macro for the 386
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* 11-14-88 GJF _openfile() now takes a file sharing flag, also some
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* cleanup (now specific to the 386)
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* 08-17-89 GJF Clean up, now specific to OS/2 2.0 (i.e., 386 flat
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* model). Also fixed copyright and indents.
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* 02-15-90 GJF Fixed copyright
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* 03-19-90 GJF Made calling type _CALLTYPE1, added #include
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* <cruntime.h> and removed #include <register.h>.
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* 07-23-90 SBM Replaced <assertm.h> by <assert.h>
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* 10-02-90 GJF New-style function declarator.
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* 01-22-91 GJF ANSI naming.
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* 03-27-92 DJM POSIX support.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 11-01-93 CFW Enable Unicode variant.
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* 01-17-94 GJF Ignore possible failure of _fclose_lk (ANSI 4.9.5.4)
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* 04-11-94 CFW Remove unused 'done' label to avoid warnings.
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* 02-06-94 CFW assert -> _ASSERTE.
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* 02-20-95 GJF Replaced WPRFLAG with _UNICODE.
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* 03-07-95 GJF _[un]lock_str macros now take FILE * arg.
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* 03-02-98 GJF Exception-safe locking.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <stdio.h>
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#include <file2.h>
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#include <share.h>
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#include <dbgint.h>
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#include <internal.h>
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#include <mtdll.h>
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#include <tchar.h>
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/***
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*FILE *freopen(filename, mode, stream) - reopen stream as new file
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*
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*Purpose:
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* Closes the file associated with stream and assigns stream to a new
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* file with current mode. Usually used to redirect a standard file
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* handle.
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*
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*Entry:
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* char *filename - new file to open
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* char *mode - new file mode, as in fopen()
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* FILE *stream - stream to close and reassign
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*
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*Exit:
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* returns stream if successful
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* return NULL if fails
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*
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*Exceptions:
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*
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*******************************************************************************/
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FILE * __cdecl _tfreopen (
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const _TSCHAR *filename,
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const _TSCHAR *mode,
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FILE *str
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)
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{
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REG1 FILE *stream;
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FILE *retval;
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_ASSERTE(filename != NULL);
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_ASSERTE(*filename != _T('\0'));
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_ASSERTE(mode != NULL);
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_ASSERTE(str != NULL);
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/* Init stream pointer */
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stream = str;
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#ifdef _MT
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_lock_str(stream);
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__try {
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#endif
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/* If the stream is in use, try to close it. Ignore possible
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* error (ANSI 4.9.5.4). */
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if ( inuse(stream) )
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_fclose_lk(stream);
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stream->_ptr = stream->_base = NULL;
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stream->_cnt = stream->_flag = 0;
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#ifdef _POSIX_
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#ifdef _UNICODE
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retval = _wopenfile(filename,mode,stream);
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#else
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retval = _openfile(filename,mode,stream);
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#endif
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#else
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#ifdef _UNICODE
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retval = _wopenfile(filename,mode,_SH_DENYNO,stream);
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#else
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retval = _openfile(filename,mode,_SH_DENYNO,stream);
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#endif
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#endif
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#ifdef _MT
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}
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__finally {
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_unlock_str(stream);
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}
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#endif
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return(retval);
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}
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