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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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access.c
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C/C++ Source or Header
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1998-06-17
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/***
*access.c - access function
*
* Copyright (c) 1989-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* This file has the _access() function which checks on file accessability.
*
*******************************************************************************/
#ifndef _MAC
#include <cruntime.h>
#include <io.h>
#include <oscalls.h>
#include <stdlib.h>
#include <errno.h>
#include <msdos.h>
#include <internal.h>
#include <tchar.h>
/***
*int _access(path, amode) - check whether file can be accessed under mode
*
*Purpose:
* Checks to see if the specified file exists and can be accessed
* in the given mode.
*
*Entry:
* _TSCHAR *path - pathname
* int amode - access mode
* (0 = exist only, 2 = write, 4 = read, 6 = read/write)
*
*Exit:
* returns 0 if file has given mode
* returns -1 and sets errno if file does not have given mode or
* does not exist
*
*Exceptions:
*
*******************************************************************************/
int __cdecl _taccess (
const _TSCHAR *path,
int amode
)
{
DWORD attr;
attr = GetFileAttributes((LPTSTR)path);
if (attr == 0xffffffff) {
/* error occured -- map error code and return */
_dosmaperr(GetLastError());
return -1;
}
/* no error; see if returned premission settings OK */
if ( (attr & FILE_ATTRIBUTE_READONLY) && (amode & 2) ) {
/* no write permission on file, return error */
errno = EACCES;
_doserrno = E_access;
return -1;
}
else
/* file exists and has requested permission setting */
return 0;
}
#else /* _MAC */
#include <cruntime.h>
#include <io.h>
#include <stdlib.h>
#include <errno.h>
#include <internal.h>
#include <string.h>
#include <macos\osutils.h>
#include <macos\files.h>
#include <macos\errors.h>
/***
*int _access(path, amode) - check whether file can be accessed under mode
*
*Purpose:
* Checks to see if the specified file exists and can be accessed
* in the given mode.
*
*Entry:
* char *path - pathname
* int amode - access mode
* (0 = exist only, 2 = write, 4 = read, 6 = read/write)
*
*Exit:
* returns 0 if file has given mode
* returns -1 and sets errno if file does not have given mode or
* does not exist
*
*Exceptions:
*
*******************************************************************************/
int __cdecl _access (
const char *path,
int amode
)
{
CInfoPBRec cinfoPB;
char szPath[256];
OSErr osErr;
if (!*path)
{
errno = ENOENT;
return -1;
}
strcpy(szPath, path);
cinfoPB.dirInfo.ioVRefNum = 0;
cinfoPB.dirInfo.ioDrDirID = 0;
cinfoPB.dirInfo.ioFDirIndex = 0;
cinfoPB.dirInfo.ioNamePtr = _c2pstr(szPath);
osErr = PBGetCatInfoSync(&cinfoPB);
if (osErr)
{
_dosmaperr(osErr);
return -1;
}
//file locked or read only permission
if ( (cinfoPB.dirInfo.ioFlAttrib & 0x1 ||
cinfoPB.dirInfo.ioDrUsrWds.frFlags == 1) && (amode & 2) )
{
/* no write permission on file, return error */
errno = EACCES;
_macerrno = permErr;
return -1;
}
else
/* file exists and has requested permission setting */
return 0;
}
#endif /* _MAC */