87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
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/***
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*access.c - access function
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*
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* Copyright (c) 1989-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* This file has the _access() function which checks on file accessability.
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*
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*Revision History:
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* 06-06-89 PHG Module created, based on asm version
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* 11-10-89 JCR Replaced DOS32QUERYFILEMODE with DOS32QUERYPATHINFO
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* 03-07-90 GJF Made calling type _CALLTYPE2 (for now), added #include
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* <cruntime.h>, fixed copyright and fixed compiler
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* warnings. Also, cleaned up the formatting a bit.
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* 03-30-90 GJF Now _CALLTYPE1.
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* 07-24-90 SBM Removed '32' from API names
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* 09-27-90 GJF New-style function declarator.
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* 12-04-90 SRW Changed to include <oscalls.h> instead of <doscalls.h>
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* 12-06-90 SRW Added _CRUISER_ and _WIN32 conditionals.
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* 01-16-91 GJF ANSI naming.
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* 04-09-91 PNT Added _MAC_ conditional
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 12-07-93 CFW Rip out Cruiser, enable wide char.
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* 02-08-95 JWM Spliced _WIN32 & Mac versions.
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* 07-01-96 GJF Replaced defined(_WIN32) with !defined(_MAC). Also,
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* detab-ed and cleaned up the format a bit.
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* 05-17-99 PML Remove all Macintosh support.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <io.h>
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#include <oscalls.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <msdos.h>
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#include <internal.h>
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#include <tchar.h>
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/***
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*int _access(path, amode) - check whether file can be accessed under mode
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*
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*Purpose:
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* Checks to see if the specified file exists and can be accessed
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* in the given mode.
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*
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*Entry:
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* _TSCHAR *path - pathname
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* int amode - access mode
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* (0 = exist only, 2 = write, 4 = read, 6 = read/write)
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*
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*Exit:
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* returns 0 if file has given mode
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* returns -1 and sets errno if file does not have given mode or
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* does not exist
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*
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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl _taccess (
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const _TSCHAR *path,
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int amode
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)
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{
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DWORD attr;
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attr = GetFileAttributes((LPTSTR)path);
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if (attr == 0xffffffff) {
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/* error occured -- map error code and return */
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_dosmaperr(GetLastError());
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return -1;
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}
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/* no error; see if returned premission settings OK */
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if ( (attr & FILE_ATTRIBUTE_READONLY) && (amode & 2) ) {
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/* no write permission on file, return error */
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errno = EACCES;
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_doserrno = E_access;
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return -1;
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}
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else
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/* file exists and has requested permission setting */
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return 0;
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}
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