343 lines
11 KiB
C
343 lines
11 KiB
C
/***
|
|
*getcwd.c - get current working directory
|
|
*
|
|
* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
|
|
*
|
|
*Purpose:
|
|
*
|
|
* contains functions _getcwd, _getdcwd and _getcdrv for getting the
|
|
* current working directory. getcwd gets the c.w.d. for the default disk
|
|
* drive, whereas _getdcwd allows one to get the c.w.d. for whatever disk
|
|
* drive is specified. _getcdrv gets the current drive.
|
|
*
|
|
*Revision History:
|
|
* 09-09-83 RKW created
|
|
* 05-??-84 DCW added conditional compilation to handle case of library
|
|
* where SS != DS (can't take address of a stack variable).
|
|
* 09-??-84 DCW changed comparison of path length to maxlen to take the
|
|
* terminating null character into account.
|
|
* 11-28-84 DCW changed to return errno values compatibly with the
|
|
* System 3 version.
|
|
* 05-19-86 SKS adapted for OS/2
|
|
* 11-19-86 SKS if pnbuf==NULL, maxlen is ignored;
|
|
* eliminated use of intermediate buffer "buf[]"; added
|
|
* entry point "_getdcwd()" which takes a drive number.
|
|
* 12-03-86 SKS if pnbuf==NULL, maxlen is the minimum allocation size
|
|
* 02-05-87 BCM fixed comparison in _getdcwd,
|
|
* (unsigned)(len+3) > (int)(maxlen), to handle maxlen < 0,
|
|
* since implicit cast to (unsigned) was occurring.
|
|
* 12-11-87 JCR Added "_LOAD_DS" to declaration
|
|
* 12-21-87 WAJ Added _getcdrv()
|
|
* 06-22-88 WAJ _getcdrv() is now made for all OS/2 libs
|
|
* 10-03-88 JCR 386: Change DOS calls to SYS calls
|
|
* 10-04-88 JCR 386: Removed 'far' keyword
|
|
* 10-10-88 GJF Made API names match DOSCALLS.H
|
|
* 01-31-89 JCR Remove _getcdrv(), which has been renamed _getdrive()
|
|
* 04-12-89 JCR Use new OS/2 system calls
|
|
* 05-25-89 JCR 386 OS/2 calls use '_syscall' calling convention
|
|
* 11-27-89 JCR Corrected ERRNO values
|
|
* 12-12-89 JCR Fixed bogus syscall introduced in previous fix (oops)
|
|
* 03-07-90 GJF Replaced _LOAD_DS by _CALLTYPE1, added #include
|
|
* <cruntime.h>, removed #include <register.h>, removed
|
|
* some leftover 16-bit support and fixed the copyright.
|
|
* Also, cleaned up the formatting a bit.
|
|
* 07-24-90 SBM Compiles cleanly with -W3 (removed unreferenced
|
|
* variable), removed redundant includes, removed
|
|
* '32' from API names
|
|
* 08-10-90 SBM Compiles cleanly with -W3 with new build of compiler
|
|
* 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.
|
|
* 08-21-91 JCR Test DOSQUERYCURRENTDIR call for error return (bug fix)
|
|
* 04-23-92 GJF Fixed initialization of DriveVar[].
|
|
* 04-28-92 GJF Revised Win32 version.
|
|
* 12-09-92 PLM Removed _getdcwd (Mac version only)
|
|
* 04-06-93 SKS Replace _CRTAPI* with __cdecl
|
|
* Change _ValidDrive to _validdrive
|
|
* 04-19-93 SKS Move _validdrive to this module
|
|
* 04-26-93 SKS Set _doserrno on invalid drive
|
|
* 05-26-93 SKS Change _getdcwd to call GetFullPathName() instead of
|
|
* reading a current directory environment variable.
|
|
* 09-30-93 GJF Removed #include <error.h> (thereby getting rid of a
|
|
* bunch of compiler warnings). Also, MTHREAD -> _MT.
|
|
* 11-01-93 CFW Enable Unicode variant.
|
|
* 12-21-93 CFW Fix API failure error handling.
|
|
* 01-04-94 CFW Fix API failure error handling correctly.
|
|
* 08-11-94 GJF Revised _validdrive() to use GetDriveType (suggestion
|
|
* from Richard Shupak).
|
|
* 08-18-94 GJF Revised _validdrive() logic slightly per suggestion
|
|
* of Richard Shupak.
|
|
* 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.
|
|
* 12-17-97 GJF Exception-safe locking.
|
|
* 05-17-99 PML Remove all Macintosh support.
|
|
*
|
|
*******************************************************************************/
|
|
|
|
#include <cruntime.h>
|
|
#include <mtdll.h>
|
|
#include <msdos.h>
|
|
#include <errno.h>
|
|
#include <malloc.h>
|
|
#include <oscalls.h>
|
|
#include <stdlib.h>
|
|
#include <internal.h>
|
|
#include <direct.h>
|
|
#include <tchar.h>
|
|
|
|
|
|
/***
|
|
*_TSCHAR *_getcwd(pnbuf, maxlen) - get current working directory of default drive
|
|
*
|
|
*Purpose:
|
|
* _getcwd gets the current working directory for the user,
|
|
* placing it in the buffer pointed to by pnbuf. It returns
|
|
* the length of the string put in the buffer. If the length
|
|
* of the string exceeds the length of the buffer, maxlen,
|
|
* then NULL is returned. If pnbuf = NULL, maxlen is ignored.
|
|
* An entry point "_getdcwd()" is defined with takes the above
|
|
* parameters, plus a drive number. "_getcwd()" is implemented
|
|
* as a call to "_getcwd()" with the default drive (0).
|
|
*
|
|
* If pnbuf = NULL, maxlen is ignored, and a buffer is automatically
|
|
* allocated using malloc() -- a pointer to which is returned by
|
|
* _getcwd().
|
|
*
|
|
* side effects: no global data is used or affected
|
|
*
|
|
*Entry:
|
|
* _TSCHAR *pnbuf = pointer to a buffer maintained by the user;
|
|
* int maxlen = length of the buffer pointed to by pnbuf;
|
|
*
|
|
*Exit:
|
|
* Returns pointer to the buffer containing the c.w.d. name
|
|
* (same as pnbuf if non-NULL; otherwise, malloc is
|
|
* used to allocate a buffer)
|
|
*
|
|
*Exceptions:
|
|
*
|
|
*******************************************************************************/
|
|
|
|
_TSCHAR * __cdecl _tgetcwd (
|
|
_TSCHAR *pnbuf,
|
|
int maxlen
|
|
)
|
|
{
|
|
_TSCHAR *retval;
|
|
|
|
#ifdef _MT
|
|
_mlock( _ENV_LOCK );
|
|
__try {
|
|
#endif
|
|
|
|
#ifdef WPRFLAG
|
|
retval = _wgetdcwd_lk(0, pnbuf, maxlen);
|
|
#else
|
|
retval = _getdcwd_lk(0, pnbuf, maxlen);
|
|
#endif
|
|
|
|
#ifdef _MT
|
|
}
|
|
__finally {
|
|
_munlock( _ENV_LOCK );
|
|
}
|
|
#endif
|
|
|
|
return retval;
|
|
}
|
|
|
|
|
|
/***
|
|
*_TSCHAR *_getdcwd(drive, pnbuf, maxlen) - get c.w.d. for given drive
|
|
*
|
|
*Purpose:
|
|
* _getdcwd gets the current working directory for the user,
|
|
* placing it in the buffer pointed to by pnbuf. It returns
|
|
* the length of the string put in the buffer. If the length
|
|
* of the string exceeds the length of the buffer, maxlen,
|
|
* then NULL is returned. If pnbuf = NULL, maxlen is ignored,
|
|
* and a buffer is automatically allocated using malloc() --
|
|
* a pointer to which is returned by _getdcwd().
|
|
*
|
|
* side effects: no global data is used or affected
|
|
*
|
|
*Entry:
|
|
* int drive - number of the drive being inquired about
|
|
* 0 = default, 1 = 'a:', 2 = 'b:', etc.
|
|
* _TSCHAR *pnbuf - pointer to a buffer maintained by the user;
|
|
* int maxlen - length of the buffer pointed to by pnbuf;
|
|
*
|
|
*Exit:
|
|
* Returns pointer to the buffer containing the c.w.d. name
|
|
* (same as pnbuf if non-NULL; otherwise, malloc is
|
|
* used to allocate a buffer)
|
|
*
|
|
*Exceptions:
|
|
*
|
|
*******************************************************************************/
|
|
|
|
|
|
#ifdef _MT
|
|
|
|
_TSCHAR * __cdecl _tgetdcwd (
|
|
int drive,
|
|
_TSCHAR *pnbuf,
|
|
int maxlen
|
|
)
|
|
{
|
|
_TSCHAR *retval;
|
|
|
|
#ifdef _MT
|
|
_mlock( _ENV_LOCK );
|
|
__try {
|
|
#endif
|
|
|
|
#ifdef WPRFLAG
|
|
retval = _wgetdcwd_lk(drive, pnbuf, maxlen);
|
|
#else
|
|
retval = _getdcwd_lk(drive, pnbuf, maxlen);
|
|
#endif
|
|
|
|
#ifdef _MT
|
|
}
|
|
_finally {
|
|
_munlock( _ENV_LOCK );
|
|
}
|
|
#endif
|
|
|
|
return retval;
|
|
}
|
|
|
|
#ifdef WPRFLAG
|
|
wchar_t * __cdecl _wgetdcwd_lk (
|
|
#else
|
|
char * __cdecl _getdcwd_lk (
|
|
#endif
|
|
int drive,
|
|
_TSCHAR *pnbuf,
|
|
int maxlen
|
|
)
|
|
#else
|
|
|
|
_TSCHAR * __cdecl _tgetdcwd (
|
|
int drive,
|
|
_TSCHAR *pnbuf,
|
|
int maxlen
|
|
)
|
|
#endif
|
|
|
|
{
|
|
_TSCHAR *p;
|
|
_TSCHAR dirbuf[_MAX_PATH];
|
|
_TSCHAR drvstr[4];
|
|
int len;
|
|
_TSCHAR *pname; /* only used as argument to GetFullPathName */
|
|
|
|
/*
|
|
* GetCurrentDirectory only works for the default drive in Win32
|
|
*/
|
|
if ( drive != 0 ) {
|
|
/*
|
|
* Not the default drive - make sure it's valid.
|
|
*/
|
|
if ( !_validdrive(drive) ) {
|
|
_doserrno = ERROR_INVALID_DRIVE;
|
|
errno = EACCES;
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Get the current directory string on that drive and its length
|
|
*/
|
|
drvstr[0] = _T('A') - 1 + drive;
|
|
drvstr[1] = _T(':');
|
|
drvstr[2] = _T('.');
|
|
drvstr[3] = _T('\0');
|
|
len = GetFullPathName( drvstr,
|
|
sizeof(dirbuf) / sizeof(_TSCHAR),
|
|
dirbuf,
|
|
&pname );
|
|
|
|
} else {
|
|
|
|
/*
|
|
* Get the current directory string and its length
|
|
*/
|
|
len = GetCurrentDirectory( sizeof(dirbuf) / sizeof(_TSCHAR),
|
|
(LPTSTR)dirbuf );
|
|
}
|
|
|
|
/* API call failed, or buffer not large enough */
|
|
if ( len == 0 || ++len > sizeof(dirbuf)/sizeof(_TSCHAR) )
|
|
return NULL;
|
|
|
|
/*
|
|
* Set up the buffer.
|
|
*/
|
|
if ( (p = pnbuf) == NULL ) {
|
|
/*
|
|
* Allocate a buffer for the user.
|
|
*/
|
|
if ( (p = (_TSCHAR *)malloc(__max(len, maxlen) * sizeof(_TSCHAR)))
|
|
== NULL )
|
|
{
|
|
errno = ENOMEM;
|
|
return NULL;
|
|
}
|
|
}
|
|
else if ( len > maxlen ) {
|
|
/*
|
|
* Won't fit in the user-supplied buffer!
|
|
*/
|
|
errno = ERANGE; /* Won't fit in user buffer */
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Place the current directory string into the user buffer
|
|
*/
|
|
|
|
return _tcscpy(p, dirbuf);
|
|
}
|
|
|
|
#ifndef WPRFLAG
|
|
|
|
/***
|
|
*int _validdrive( unsigned drive ) -
|
|
*
|
|
*Purpose: returns non zero if drive is a valid drive number.
|
|
*
|
|
*Entry: drive = 0 => default drive, 1 => a:, 2 => b: ...
|
|
*
|
|
*Exit: 0 => drive does not exist.
|
|
*
|
|
*Exceptions:
|
|
*
|
|
*******************************************************************************/
|
|
|
|
int __cdecl _validdrive (
|
|
unsigned drive
|
|
)
|
|
{
|
|
unsigned retcode;
|
|
char drvstr[4];
|
|
|
|
if ( drive == 0 )
|
|
return 1;
|
|
|
|
drvstr[0] = 'A' + drive - 1;
|
|
drvstr[1] = ':';
|
|
drvstr[2] = '\\';
|
|
drvstr[3] = '\0';
|
|
|
|
if ( ((retcode = GetDriveType( drvstr )) == DRIVE_UNKNOWN) ||
|
|
(retcode == DRIVE_NO_ROOT_DIR) )
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
#endif /* WPRFLAG */
|