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compat_getdents.c revision 1.1 
      1 /*	$NetBSD: compat_getdents.c,v 1.1 2005/09/13 01:44:09 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2005 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #if defined(LIBC_SCCS) && !defined(lint)
     41 __RCSID("$NetBSD: compat_getdents.c,v 1.1 2005/09/13 01:44:09 christos Exp $");
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #define __LIBC12_SOURCE__
     45 
     46 #include "namespace.h"
     47 #include <sys/types.h>
     48 #include <dirent.h>
     49 #include <compat/include/dirent.h>
     50 #include <string.h>
     51 
     52 /*
     53  * libc12 compatible getdents routine.
     54  */
     55 int
     56 getdents(int fd, char *buf, size_t nbytes)
     57 {
     58 	struct dirent *ndp, *nndp, *endp;
     59 	struct dirent12 *odp;
     60 	int rv;
     61 
     62 	if ((rv = __getdents30(fd, buf, nbytes)) == -1)
     63 		return rv;
     64 
     65 	odp = (struct dirent12 *)(void *)buf;
     66 	ndp = (struct dirent *)(void *)buf;
     67 	endp = (struct dirent *)(void *)&buf[rv];
     68 
     69 	/*
     70 	 * In-place conversion. This works because odp
     71 	 * is smaller than ndp, but it has to be done
     72 	 * in the right sequence.
     73 	 */
     74 	for (; ndp < endp; ndp = nndp) {
     75 		nndp = _DIRENT_NEXT(ndp);
     76 		odp->d_ino = (u_int32_t)ndp->d_ino;
     77 		if (ndp->d_namlen >= sizeof(odp->d_name))
     78 			odp->d_namlen = sizeof(odp->d_name) - 1;
     79 		else
     80 			odp->d_namlen = (u_int8_t)ndp->d_namlen;
     81 		odp->d_type = ndp->d_type;
     82 		(void)memcpy(odp->d_name, ndp->d_name, (size_t)odp->d_namlen);
     83 		odp->d_name[odp->d_namlen] = '\0';
     84 		odp->d_reclen = _DIRENT_SIZE(odp);
     85 		odp = _DIRENT_NEXT(odp);
     86 	}
     87 	return ((char *)(void *)odp) - buf;
     88 }
     89