gtcwdlnx.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 76 行

 /****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:  Implementation of getcwd() for Linux. 
*
****************************************************************************/


#include "variety.h"
#include "widechar.h"
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include "seterrno.h"
#include "liballoc.h"

#include "../../linux/h/syslinux.h"

_WCRTLINK CHAR_TYPE *__F_NAME(getcwd,_wgetcwd)( CHAR_TYPE *buf, size_t size )
{
    char path[_MAX_PATH];
    long realsize;
    CHAR_TYPE *out;
    char *in;
    CHAR_TYPE ch;

    realsize = sys_call2(SYS_getcwd, (u_long)path, _MAX_PATH);

    if( realsize < 0 ) {
        __set_errno(- realsize);
        return( NULL );
    }
    if( buf == NULL ) {
        buf = lib_malloc( max(size,realsize+1) * CHARSIZE );
        if( buf == NULL ) {
            __set_errno( ENOMEM );
            return( NULL );
        }
    } else {
        if( realsize > size ) {
            __set_errno( ERANGE );
            return( NULL );
        }
    }
    in = path;
    out = buf;
    do {
        ch = *(in++);
        *(out++) = ch;
    } while( ch );
    return( buf );
}