windows-xp/Source/XPSP1/NT/base/crts/crtw32/dos/chmod.c

/***
*chmod.c - change file attributes
*
*       Copyright (c) 1989-2001, Microsoft Corporation. All rights reserved.
*
*Purpose:
*       Defines _chmod() - change file attributes
*
*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.
*       04-06-93  SKS   Replace _CRTAPI* with __cdecl
*       11-01-93  CFW   Enable Unicode variant, rip out Cruiser.
*       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 <oscalls.h>
#include <internal.h>
#include <io.h>
#include <sys\types.h>
#include <sys\stat.h>
#include <tchar.h>

/***
*int _chmod(path, mode) - change file mode
*
*Purpose:
*       Changes file mode permission setting to that specified in
*       mode.  The only XENIX mode bit supported is user write.
*
*Entry:
*       _TSCHAR *path - file name
*       int mode - mode to change to
*
*Exit:
*       returns 0 if successful
*       returns -1 and sets errno if not successful
*
*Exceptions:
*
*******************************************************************************/

int __cdecl _tchmod (
        const _TSCHAR *path,
        int mode
        )
{
        DWORD attr;

        attr = GetFileAttributes((LPTSTR)path);
        if (attr  == 0xffffffff) {
                /* error occured -- map error code and return */
                _dosmaperr(GetLastError());
                return -1;
        }

        if (mode & _S_IWRITE) {
                /* clear read only bit */
                attr &= ~FILE_ATTRIBUTE_READONLY;
        }
        else {
                /* set read only bit */
                attr |= FILE_ATTRIBUTE_READONLY;
        }

        /* set new attribute */
        if (!SetFileAttributes((LPTSTR)path, attr)) {
                /* error occured -- map error code and return */
                _dosmaperr(GetLastError());
                return -1;
        }

        return 0;
}