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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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crt
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src
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fopen.c
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C/C++ Source or Header
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1998-06-17
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3KB
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106 lines
/***
*fopen.c - open a file
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines fopen() and _fsopen() - open a file as a stream and open a file
* with a specified sharing mode as a stream
*
*******************************************************************************/
#include <cruntime.h>
#include <stdio.h>
#include <share.h>
#include <dbgint.h>
#include <internal.h>
#include <mtdll.h>
#include <file2.h>
#include <tchar.h>
/***
*FILE *_fsopen(file, mode, shflag) - open a file
*
*Purpose:
* Opens the file specified as a stream. mode determines file mode:
* "r": read "w": write "a": append
* "r+": read/write "w+": open empty for read/write
* "a+": read/append
* Append "t" or "b" for text and binary mode. shflag determines the
* sharing mode. Values are the same as for sopen().
*
*Entry:
* char *file - file name to open
* char *mode - mode of file access
*
*Exit:
* returns pointer to stream
* returns NULL if fails
*
*Exceptions:
*
*******************************************************************************/
FILE * __cdecl _tfsopen (
const _TSCHAR *file,
const _TSCHAR *mode
,int shflag
)
{
REG1 FILE *stream;
REG2 FILE *retval;
_ASSERTE(file != NULL);
_ASSERTE(*file != _T('\0'));
_ASSERTE(mode != NULL);
_ASSERTE(*mode != _T('\0'));
/* Get a free stream */
/* [NOTE: _getstream() returns a locked stream.] */
if ((stream = _getstream()) == NULL)
return(NULL);
/* open the stream */
#ifdef _UNICODE
retval = _wopenfile(file,mode,shflag,stream);
#else /* _UNICODE */
retval = _openfile(file,mode,shflag,stream);
#endif /* _UNICODE */
/* unlock stream and return. */
_unlock_str(stream);
return(retval);
}
/***
*FILE *fopen(file, mode) - open a file
*
*Purpose:
* Opens the file specified as a stream. mode determines file mode:
* "r": read "w": write "a": append
* "r+": read/write "w+": open empty for read/write
* "a+": read/append
* Append "t" or "b" for text and binary mode
*
*Entry:
* char *file - file name to open
* char *mode - mode of file access
*
*Exit:
* returns pointer to stream
* returns NULL if fails
*
*Exceptions:
*
*******************************************************************************/
FILE * __cdecl _tfopen (
const _TSCHAR *file,
const _TSCHAR *mode
)
{
return( _tfsopen(file, mode, _SH_DENYNO) );
}