mirror of https://github.com/tongzx/nt5src
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
86 lines
2.8 KiB
86 lines
2.8 KiB
/***
|
|
*access.c - access function
|
|
*
|
|
* Copyright (c) 1989-2001, Microsoft Corporation. All rights reserved.
|
|
*
|
|
*Purpose:
|
|
* This file has the _access() function which checks on file accessability.
|
|
*
|
|
*Revision History:
|
|
* 06-06-89 PHG Module created, based on asm version
|
|
* 11-10-89 JCR Replaced DOS32QUERYFILEMODE with DOS32QUERYPATHINFO
|
|
* 03-07-90 GJF Made calling type _CALLTYPE2 (for now), added #include
|
|
* <cruntime.h>, fixed copyright and fixed compiler
|
|
* warnings. Also, cleaned up the formatting a bit.
|
|
* 03-30-90 GJF Now _CALLTYPE1.
|
|
* 07-24-90 SBM Removed '32' from API names
|
|
* 09-27-90 GJF New-style function declarator.
|
|
* 12-04-90 SRW Changed to include <oscalls.h> instead of <doscalls.h>
|
|
* 12-06-90 SRW Added _CRUISER_ and _WIN32 conditionals.
|
|
* 01-16-91 GJF ANSI naming.
|
|
* 04-09-91 PNT Added _MAC_ conditional
|
|
* 04-06-93 SKS Replace _CRTAPI* with __cdecl
|
|
* 12-07-93 CFW Rip out Cruiser, enable wide char.
|
|
* 02-08-95 JWM Spliced _WIN32 & Mac versions.
|
|
* 07-01-96 GJF Replaced defined(_WIN32) with !defined(_MAC). Also,
|
|
* detab-ed and cleaned up the format a bit.
|
|
* 05-17-99 PML Remove all Macintosh support.
|
|
*
|
|
*******************************************************************************/
|
|
|
|
#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;
|
|
|
|
}
|