stat.c

C标准库源代码

/***
*stat.c - get file status
*
*       Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
*       defines _stat() - get file status
*
*******************************************************************************/

#ifndef _MAC

#include <cruntime.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <ctype.h>
#include <msdos.h>
#include <dostypes.h>
#include <oscalls.h>
#include <string.h>
#include <internal.h>
#include <stdlib.h>
#include <direct.h>
#include <mbstring.h>
#include <tchar.h>


#define ISSLASH(a)  ((a) == _T('\\') || (a) == _T('/'))


#ifdef _UNICODE
#define __tdtoxmode __wdtoxmode
#else  /* _UNICODE */
#define __tdtoxmode __dtoxmode
#endif  /* _UNICODE */


/*
 * Local routine which returns true if the argument is a UNC name
 * specifying the root name of a share, such as '\\server\share\'.
 */

static int IsRootUNCName(const _TSCHAR *path);


/***
*unsigned __tdtoxmode(attr, name) -
*
*Purpose:
*
*Entry:
*
*Exit:
*
*Exceptions:
*
*******************************************************************************/

#ifdef _USE_INT64

extern unsigned short __cdecl __tdtoxmode(int, const _TSCHAR *);

#else  /* _USE_INT64 */

unsigned short __cdecl __tdtoxmode (
        int attr,
        const _TSCHAR *name
        )
{
        REG1 unsigned short uxmode;
        unsigned dosmode;
        REG2 const _TSCHAR *p;

        dosmode = attr & 0xff;
        if ((p = name)[1] == _T(':'))
            p += 2;

        /* check to see if this is a directory - note we must make a special
        * check for the root, which DOS thinks is not a directory
        */

        uxmode = (unsigned short)
                 (((ISSLASH(*p) && !p[1]) || (dosmode & A_D) || !*p)
                 ? _S_IFDIR|_S_IEXEC : _S_IFREG);

        /* If attribute byte does not have read-only bit, it is read-write */

        uxmode |= (dosmode & A_RO) ? _S_IREAD : (_S_IREAD|_S_IWRITE);

        /* see if file appears to be executable - check extension of name */

        if (p = _tcsrchr(name, _T('.'))) {
            if ( !_tcsicmp(p, _T(".exe")) ||
                 !_tcsicmp(p, _T(".cmd")) ||
                 !_tcsicmp(p, _T(".bat")) ||
                 !_tcsicmp(p, _T(".com")) )
                uxmode |= _S_IEXEC;
        }

        /* propagate user read/write/execute bits to group/other fields */

        uxmode |= (uxmode & 0700) >> 3;
        uxmode |= (uxmode & 0700) >> 6;

        return(uxmode);
}

#endif  /* _USE_INT64 */

/***
*int _stat(name, buf) - get file status info
*
*Purpose:
*       _stat obtains information about the file and stores it in the
*       structure pointed to by buf.
*
*       Note: We cannot directly use the file time stamps returned in the
*       WIN32_FIND_DATA structure. The values are supposedly in system time
*       and system time is ambiguously defined (it is UTC for Windows NT, local
*       time for Win32S and probably local time for Win32C). Therefore, these
*       values must be converted to local time before than can be used.
*
*Entry:
*       _TSCHAR *name -    pathname of given file
*       struct _stat *buffer - pointer to buffer to store info in
*
*Exit:
*       fills in structure pointed to by buffer
*       returns 0 if successful
*       returns -1 and sets errno if unsuccessful
*
*Exceptions:
*
*******************************************************************************/

#ifdef _USE_INT64

int __cdecl _tstati64 (
        REG1 const _TSCHAR *name,
        REG2 struct _stati64 *buf
        )

#else  /* _USE_INT64 */

int __cdecl _tstat (
        REG1 const _TSCHAR *name,
        REG2 struct _stat *buf
        )

#endif  /* _USE_INT64 */

{
        _TSCHAR *  path;
        _TSCHAR    pathbuf[ _MAX_PATH ];
        int drive;          /* A: = 1, B: = 2, etc. */
        HANDLE findhandle;
        WIN32_FIND_DATA findbuf;

        /* Don't allow wildcards to be interpreted by system */

#ifdef _UNICODE
        if (wcspbrk(name, L"?*")) {
#else  /* _UNICODE */
        if (_mbspbrk(name, "?*")) {
#endif  /* _UNICODE */
            errno = ENOENT;
            _doserrno = E_nofile;
            return(-1);
        }

        /* Try to get disk from name.  If none, get current disk.  */

        if (name[1] == _T(':')){
            if ( *name && !name[2] ){
                errno = ENOENT;             /* return an error if name is   */
                _doserrno = E_nofile;       /* just drive letter then colon */
                return( -1 );
            }
            drive = _totlower(*name) - _T('a') + 1;
        }
        else
            drive = _getdrive();

        /* Call Find Match File */
        findhandle = FindFirstFile((_TSCHAR *)name, &findbuf);
        if ( findhandle == INVALID_HANDLE_VALUE ) {
#ifdef _UNICODE
            if ( !( wcspbrk(name, L"./\\") &&
#else  /* _UNICODE */
            if ( !( _mbspbrk(name, "./\\") &&
#endif  /* _UNICODE */
                 (path = _tfullpath( pathbuf, name, _MAX_PATH )) &&
                 /* root dir. ('C:\') or UNC root dir. ('\\server\share\') */
                 ((_tcslen( path ) == 3) || IsRootUNCName(path)) &&
                 (GetDriveType( path ) > 1) ) )
            {
                errno = ENOENT;
                _doserrno = E_nofile;
                return( -1 );
            }

            /*
             * Root directories (such as C:\ or \\server\share\ are fabricated.
             */

            findbuf.dwFileAttributes = A_D;
            findbuf.nFileSizeHigh = 0;
            findbuf.nFileSizeLow = 0;
            findbuf.cFileName[0] = _T('\0');

            buf->st_mtime = __loctotime_t(1980,1,1,0,0,0, -1);
            buf->st_atime = buf->st_mtime;
            buf->st_ctime = buf->st_mtime;
        }
        else {
            SYSTEMTIME SystemTime;
            FILETIME LocalFTime;

            if ( !FileTimeToLocalFileTime( &findbuf.ftLastWriteTime,
                                           &LocalFTime )            ||
                 !FileTimeToSystemTime( &LocalFTime, &SystemTime ) )
            {
                _dosmaperr( GetLastError() );
                FindClose( findhandle );
                return( -1 );
            }

            buf->st_mtime = __loctotime_t( SystemTime.wYear,
                                           SystemTime.wMonth,
                                           SystemTime.wDay,
                                           SystemTime.wHour,
                                           SystemTime.wMinute,
                                           SystemTime.wSecond,
                                           -1 );

            if ( findbuf.ftLastAccessTime.dwLowDateTime ||
                 findbuf.ftLastAccessTime.dwHighDateTime )
            {
                if ( !FileTimeToLocalFileTime( &findbuf.ftLastAccessTime,
                                               &LocalFTime )                ||
                     !FileTimeToSystemTime( &LocalFTime, &SystemTime ) )
                {
                    _dosmaperr( GetLastError() );
                    FindClose( findhandle );
                    return( -1 );
                }

                buf->st_atime = __loctotime_t( SystemTime.wYear,
                                               SystemTime.wMonth,
                                               SystemTime.wDay,
                                               SystemTime.wHour,
                                               SystemTime.wMinute,
                                               SystemTime.wSecond,
                                               -1 );
            } else
                buf->st_atime = buf->st_mtime ;

            if ( findbuf.ftCreationTime.dwLowDateTime ||
                 findbuf.ftCreationTime.dwHighDateTime )
            {
                if ( !FileTimeToLocalFileTime( &findbuf.ftCreationTime,
                                               &LocalFTime )                ||
                     !FileTimeToSystemTime( &LocalFTime, &SystemTime ) )
                {
                    _dosmaperr( GetLastError() );
                    FindClose( findhandle );
                    return( -1 );
                }

                buf->st_ctime = __loctotime_t( SystemTime.wYear,
                                               SystemTime.wMonth,
                                               SystemTime.wDay,
                                               SystemTime.wHour,