147 lines
5 KiB
C
147 lines
5 KiB
C
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/***
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*fullpath.c -
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*
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* Copyright (c) 1987-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose: contains the function _fullpath which makes an absolute path out
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* of a relative path. i.e. ..\pop\..\main.c => c:\src\main.c if the
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* current directory is c:\src\src
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*
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*Revision History:
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* 12-21-87 WAJ Initial version
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* 01-08-88 WAJ now treats / as an \
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* 06-22-88 WAJ now handles network paths ie \\sl\users
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* 01-31-89 SKS/JCR Renamed _canonic to _fullpath
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* 04-03-89 WAJ Now returns "d:\dir" for "."
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* 05-09-89 SKS Do not change the case of arguments
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* 11-30-89 JCR Preserve errno setting from _getdcwd() call on errors
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* 03-07-90 GJF Replaced _LOAD_DS with _CALLTYPE1, added #include
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* <cruntime.h>, removed #include <register.h> and fixed
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* the copyright.
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* 04-25-90 JCR Fixed an incorrect errno setting
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* 06-14-90 SBM Fixed bugs in which case of user provided drive letter
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* was not always preserved, and c:\foo\\bar did not
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* generate an error
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* 08-10-90 SBM Compiles cleanly with -W3
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* 08-28-90 SBM Fixed bug in which UNC names were being rejected
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* 09-27-90 GJF New-style function declarator.
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* 01-18-91 GJF ANSI naming.
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* 11-30-92 KRS Ported _MBCS code from 16-bit tree.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 04-26-93 SKS Add check for drive validity
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* 08-03-93 KRS Change to use _ismbstrail instead of isdbcscode.
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* 09-27-93 CFW Avoid cast bug.
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* 12-07-93 CFW Wide char enable.
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* 01-26-94 CFW Remove unused isdbcscode function.
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* 11-08-94 GJF Revised to use GetFullPathName.
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* 02-08-95 JWM Spliced _WIN32 & Mac versions.
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* 03-28-96 GJF Free malloc-ed buffer if GetFullPathName fails.
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* Detab-ed. Also, cleaned up the ill-formatted Mac
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* version a bit and renamed isdbcscode to __isdbcscode.
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* 07-01-96 GJF Replaced defined(_WIN32) by !defined(_MAC).
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* 12-15-98 GJF Changes for 64-bit size_t.
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* 05-17-99 PML Remove all Macintosh support.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <stdio.h>
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#include <direct.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <internal.h>
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#include <tchar.h>
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#include <windows.h>
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/***
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*_TSCHAR *_fullpath( _TSCHAR *buf, const _TSCHAR *path, maxlen );
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*
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*Purpose:
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*
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* _fullpath - combines the current directory with path to form
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* an absolute path. i.e. _fullpath takes care of .\ and ..\
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* in the path.
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*
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* The result is placed in buf. If the length of the result
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* is greater than maxlen NULL is returned, otherwise
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* the address of buf is returned.
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*
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* If buf is NULL then a buffer is malloc'ed and maxlen is
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* ignored. If there are no errors then the address of this
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* buffer is returned.
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*
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* If path specifies a drive, the curent directory of this
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* drive is combined with path. If the drive is not valid
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* and _fullpath needs the current directory of this drive
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* then NULL is returned. If the current directory of this
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* non existant drive is not needed then a proper value is
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* returned.
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* For example: path = "z:\\pop" does not need z:'s current
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* directory but path = "z:pop" does.
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*
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*
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*
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*Entry:
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* _TSCHAR *buf - pointer to a buffer maintained by the user;
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* _TSCHAR *path - path to "add" to the current directory
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* int maxlen - length of the buffer pointed to by buf
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*
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*Exit:
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* Returns pointer to the buffer containing the absolute path
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* (same as buf if non-NULL; otherwise, malloc is
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* used to allocate a buffer)
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*
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*Exceptions:
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*
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*******************************************************************************/
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_TSCHAR * __cdecl _tfullpath (
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_TSCHAR *UserBuf,
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const _TSCHAR *path,
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size_t maxlen
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)
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{
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_TSCHAR *buf;
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_TSCHAR *pfname;
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unsigned long count;
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if ( !path || !*path ) /* no work to do */
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return( _tgetcwd( UserBuf, (int)maxlen ) );
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/* allocate buffer if necessary */
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if ( !UserBuf )
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if ( !(buf = malloc(_MAX_PATH * sizeof(_TSCHAR))) ) {
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errno = ENOMEM;
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return( NULL );
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}
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else
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maxlen = _MAX_PATH;
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else
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buf = UserBuf;
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count = GetFullPathName ( path,
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(int)maxlen,
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buf,
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&pfname );
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if ( count >= maxlen ) {
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if ( !UserBuf )
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free(buf);
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errno = ERANGE;
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return( NULL );
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}
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else if ( count == 0 ) {
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if ( !UserBuf )
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free(buf);
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_dosmaperr( GetLastError() );
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return( NULL );
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}
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return( buf );
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}
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