chmod.c

C标准库源代码

/***
*chmod.c - change file attributes
*
*       Copyright (c) 1989-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
*       Defines _chmod() - change file attributes
*
*******************************************************************************/

#ifndef _MAC

#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;
}

#else  /* _MAC */


#include <cruntime.h>
#include <internal.h>
#include <io.h>
#include <sys\types.h>
#include <sys\stat.h>
#include <string.h>
#include <errno.h>
#include <macos\osutils.h>
#include <macos\files.h>
#include <macos\errors.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:
*       char *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 _chmod (
        const char *path,
        int mode
        )
{
        HParamBlockRec hparamBlock;
        char szPath[256];
        OSErr osErr;

        if (!*path)
        {
                errno = ENOENT;
                return -1;
        }

        strcpy(szPath, path);
        hparamBlock.fileParam.ioNamePtr = _c2pstr(szPath);
        hparamBlock.fileParam.ioVRefNum = 0;
        hparamBlock.fileParam.ioDirID = 0;

        if (mode & _S_IWRITE) {
                /* clear read only/locked bit */
                osErr = PBHRstFLockSync(&hparamBlock);
        }
        else {
                /* set read only/locked bit */
                osErr = PBHSetFLockSync(&hparamBlock);
        }

        if (osErr)
        {
            _dosmaperr(osErr);
            return -1;
        }

        return 0;
}

#endif  /* _MAC */