4coder-non-source/test_data/lots_of_files/access.c

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2023-09-30 01:17:40 +00:00
/***
*access.c - access function
*
* Copyright (c) Microsoft Corporation. All rights reserved.
*
*Purpose:
* This file has the _access() function which checks on file accessability.
*
*******************************************************************************/
#include <cruntime.h>
#include <io.h>
#include <oscalls.h>
#include <stdlib.h>
#include <errno.h>
#include <msdos.h>
#include <internal.h>
#include <tchar.h>
#include <malloc.h>
#include <dbgint.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
)
{
errno_t e;
e = _taccess_s(path,amode);
return e ? -1 : 0 ;
}
/***
*errno_t _access_s(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 errno_t for any other errors
*
*Exceptions:
*
*******************************************************************************/
#ifndef _UNICODE
errno_t __cdecl _access_s (
const char *path,
int amode
)
{
wchar_t* pathw = NULL;
errno_t retval;
if (path)
{
if (!__copy_path_to_wide_string(path, &pathw))
return errno;
}
/* call the wide-char variant */
retval = _waccess_s(pathw, amode);
_free_crt(pathw); /* _free_crt leaves errno alone if everything completes as expected */
return retval;
}
#else /* _UNICODE */
errno_t __cdecl _waccess_s (
const wchar_t *path,
int amode
)
{
WIN32_FILE_ATTRIBUTE_DATA attr_data;
_VALIDATE_CLEAR_OSSERR_RETURN_ERRCODE( (path != NULL), EINVAL);
_VALIDATE_CLEAR_OSSERR_RETURN_ERRCODE( ((amode & (~6)) == 0), EINVAL);
if (!GetFileAttributesExW(path, GetFileExInfoStandard, (void*) &attr_data)) {
/* error occured -- map error code and return */
_dosmaperr(GetLastError());
return errno;
}
if(attr_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
{
/* All directories have read & write access */
return 0;
}
/* no error; see if returned premission settings OK */
if ( (attr_data.dwFileAttributes & FILE_ATTRIBUTE_READONLY) && (amode & 2) ) {
/* no write permission on file, return error */
_doserrno = E_access;
errno = EACCES;
return errno;
}
else
/* file exists and has requested permission setting */
return 0;
}
#endif /* _UNICODE */