adtools/clib2

/*
 * $Id: unistd_chown.c,v 1.12 2006-09-25 15:41:50 obarthel Exp $
 *
 * :ts=4
 *
 * Portable ISO 'C' (1994) runtime library for the Amiga computer
 * Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Neither the name of Olaf Barthel nor the names of contributors
 *     may be used to endorse or promote products derived from this
 *     software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _STDLIB_NULL_POINTER_CHECK_H
#include "stdlib_null_pointer_check.h"
#endif /* _STDLIB_NULL_POINTER_CHECK_H */

/****************************************************************************/

#ifndef _UNISTD_HEADERS_H
#include "unistd_headers.h"
#endif /* _UNISTD_HEADERS_H */

/****************************************************************************/

/* The following is not part of the ISO 'C' (1994) standard. */

/****************************************************************************/

int
chown(const char * path_name, uid_t owner, gid_t group)
{
    #if defined(UNIX_PATH_SEMANTICS)
    struct name_translation_info path_name_nti;
    #endif /* UNIX_PATH_SEMANTICS */
    struct DevProc * dvp = NULL;
    BPTR file_lock = ZERO;
    BOOL owner_changed = TRUE;
    LONG status;
    int result = ERROR;

    ENTER();

    SHOWSTRING(path_name);
    SHOWVALUE(owner);
    SHOWVALUE(group);

    assert( path_name != NULL );

    if(__check_abort_enabled)
        __check_abort();

    #if defined(CHECK_FOR_NULL_POINTERS)
    {
        if(path_name == NULL)
        {
            SHOWMSG("invalid path name");

            __set_errno(EFAULT);
            goto out;
        }
    }
    #endif /* CHECK_FOR_NULL_POINTERS */

    #if defined(UNIX_PATH_SEMANTICS)
    {
        if(__unix_path_semantics)
        {
            if(path_name[0] == '\0')
            {
                SHOWMSG("no name given");

                __set_errno(ENOENT);
                goto out;
            }

            if(__translate_unix_to_amiga_path_name(&path_name,&path_name_nti) != 0)
                goto out;

            if(path_name_nti.is_root)
            {
                __set_errno(EACCES);
                goto out;
            }
        }
    }
    #endif /* UNIX_PATH_SEMANTICS */

    /* A value of -1 for either the owner or the group ID means
       that what's currently being used should not be changed. */
    if(owner == (uid_t)-1 || group == (gid_t)-1)
    {
        D_S(struct FileInfoBlock,fib);

        PROFILE_OFF();

        /* Try to find out which owner/group information
           is currently in use. */
        file_lock = Lock((STRPTR)path_name,SHARED_LOCK);
        if(file_lock == ZERO || CANNOT Examine(file_lock,fib))
        {
            PROFILE_ON();

            __set_errno(__translate_access_io_error_to_errno(IoErr()));
            goto out;
        }

        UnLock(file_lock);
        file_lock = ZERO;

        PROFILE_ON();

        /* Replace the information that should not be changed. */
        if(owner == (uid_t)-1)
            owner = fib->fib_OwnerUID;

        if(group == (gid_t)-1)
            group = fib->fib_OwnerGID;

        /* Is anything different at all? */
        if(owner == fib->fib_OwnerUID && group == fib->fib_OwnerGID)
            owner_changed = FALSE;
    }

    if(owner > 65535 || group > 65535)
    {
        SHOWMSG("invalid owner or group");

        __set_errno(EINVAL);
        goto out;
    }

    if(owner_changed)
    {
        D(("changing owner of '%s'",path_name));

        #if defined(__amigaos4__)
        {
            PROFILE_OFF();
            status = SetOwner((STRPTR)path_name,(LONG)((((ULONG)owner) << 16) | group));
            PROFILE_ON();
        }
        #else
        {
            if(((struct Library *)DOSBase)->lib_Version >= 39)
            {
                PROFILE_OFF();
                status = SetOwner((STRPTR)path_name,(LONG)((((ULONG)owner) << 16) | group));
                PROFILE_ON();
            }
            else
            {
                D_S(struct bcpl_name,new_name);
                size_t len;

                len = strlen(path_name);
                if(len >= sizeof(new_name->name))
                {
                    __set_errno(ENAMETOOLONG);
                    goto out;
                }

                PROFILE_OFF();
                dvp = GetDeviceProc((STRPTR)path_name,NULL);
                PROFILE_ON();

                if(dvp == NULL)
                {
                    __set_errno(__translate_io_error_to_errno(IoErr()));
                    goto out;
                }

                new_name->name[0] = len;
                memmove(&new_name->name[1],path_name,len);

                PROFILE_OFF();
                status = DoPkt(dvp->dvp_Port,ACTION_SET_OWNER,0,dvp->dvp_Lock,MKBADDR(new_name),(LONG)((((ULONG)owner) << 16) | group),0);
                PROFILE_ON();
            }
        }
        #endif /* __amigaos4__ */

        if(status == DOSFALSE)
        {
            __set_errno(__translate_io_error_to_errno(IoErr()));
            goto out;
        }
    }

    result = OK;

 out:

    PROFILE_OFF();

    FreeDeviceProc(dvp);

    if(file_lock != ZERO)
        UnLock(file_lock);

    PROFILE_ON();

    RETURN(result);
    return(result);
}