Category : C++ Source Code
Archive : VCCRT1.ZIP
Filename : STAT.C
Output of file : STAT.C contained in archive : VCCRT1.ZIP
*dos/stat.c - get file status info
*
* Copyright (c) 1985-1992, Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines stat() - get file status info
*
*******************************************************************************/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
static int near _ValidDrive( unsigned drive );
#define ISSLASH(a) ((a) == '\\' || (a) == '/')
/***
*static unsigned near _dtoxmode(attr, name) -
*
*Purpose:
*
*Entry:
*
*Exit:
*
*Exceptions:
*
*******************************************************************************/
static unsigned near _dtoxmode(int attr, const char *name)
{
REG1 unsigned uxmode;
unsigned dosmode;
REG2 const char *p;
dosmode = attr & 0xff;
if ((p = name)[1] == ':')
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 = (( 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 = strrchr(name, '.')) {
if ( !_stricmp(p, ".exe") ||
!_stricmp(p, ".bat") ||
!_stricmp(p, ".com") )
uxmode |= S_IEXEC;
}
/* propagate user read/write/execute bits to group/other fields */
uxmode |= (uxmode & 0700) >> 3;
uxmode |= (uxmode & 0700) >> 6;
return(uxmode);
}
/***
*int _stat(name, buf) - get file status info
*
*Purpose:
* stat obtains information about the file or directory specified
* by name and stores it in the structure pointed to by buf.
*
*Entry:
* char *name - pathname of file
* struct _stat *buf - pointer to structure to fill in
*
*Exit:
* fills in structure pointed to by buf
* returns 0 if successful
* returns -1 and sets errno if unsuccessful
*
*Exceptions:
*
*******************************************************************************/
int _stat( REG1 const char *name, REG2 struct _stat *buf)
{
_WINSTATIC struct _find_t findbuf;
int drive; /* A: = 1, B: = 2, etc. */
char *path;
_WINSTATIC char pathbuf[ _MAX_PATH ];
/* Don't allow wildcards to be interpreted by system */
if (_mbspbrk(name, "?*")) {
errno = ENOENT;
return(-1);
}
/* Try to get disk from name. If none, get current disk. */
if (name[1] == ':'){
if ( *name && !name[2] ) {
errno = ENOENT; /* return an error if name is */
return(-1); /* just drive letter then colon */
}
drive = tolower(*name) - 'a' + 1;
}
else
drive = _getdrive();
/* Get info from DOS about the file */
if ( _dos_findfirst(name, (_A_HIDDEN | _A_SYSTEM | _A_SUBDIR), &findbuf)
!= 0) {
/* Error on findfirst -- no matching file name */
/* See if we're looking for the root directory */
/* In the non-MBCS case, _mbspbrk is mapped to strpbrk by
* mbstring.h */
if ( !( _mbspbrk(name, "./\\") &&
(path = _fullpath( pathbuf, name, _MAX_PATH )) &&
(strlen( path ) == 3) &&
_ValidDrive( drive ) ) ) {
errno = ENOENT;
return(-1);
}
findbuf.attrib = _A_SUBDIR;
findbuf.size = 0L;
findbuf.wr_date = (1 << 5) + 1; /* 1 January 1980 */
findbuf.wr_time = 0; /* 00:00:00 */
}
/* Fill in the user's buffer */
buf->st_uid = buf->st_gid = buf->st_ino = 0;
buf->st_rdev = buf->st_dev = drive - 1;
buf->st_mode = _dtoxmode(findbuf.attrib, name);
buf->st_nlink = 1;
buf->st_size = findbuf.size;
buf->st_atime = buf->st_mtime = buf->st_ctime =
XTIME(findbuf.wr_date, findbuf.wr_time);
/* Good return */
return(0);
}
/***
*static int near _ValidDrive( unsigned dive )
*
*Purpose:
* Determine if the supplied drive is valid or not.
*
* NOTES:
* (1) Uses function 0x1C (get drive data)
* (2) This routine MUST save/restore DS since function 0x1C
* hammers that reg (compiler _loadds option should handle this).
*
*Entry:
* drive = 0 = default drive,
* 1 = a:, 2 => b: ...
*Exit:
* !0 = drive exists
* 0 = drive does not exist.
*Exceptions:
*
*******************************************************************************/
static int near _ValidDrive( unsigned drive )
{
_WINSTATIC union _REGS inregs;
_WINSTATIC union _REGS outregs;
_WINSTATIC struct _SREGS segregs;
inregs.h.ah = 0x1c;
inregs.h.dl = (unsigned char)drive;
segregs.ds = segregs.es = 0;
return( (_intdosx(&inregs, &outregs, &segregs) & 0xFF) != 0xFF);
}
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