xref: /minix3/lib/libc/compat/sys/compat_getdents.c (revision f14fb602092e015ff630df58e17c2a9cd57d29b3)
1*f14fb602SLionel Sambuc /*	$NetBSD: compat_getdents.c,v 1.6 2012/03/13 22:24:48 joerg Exp $	*/
22fe8fb19SBen Gras 
32fe8fb19SBen Gras /*-
42fe8fb19SBen Gras  * Copyright (c) 2005 The NetBSD Foundation, Inc.
52fe8fb19SBen Gras  * All rights reserved.
62fe8fb19SBen Gras  *
72fe8fb19SBen Gras  * This code is derived from software contributed to The NetBSD Foundation
82fe8fb19SBen Gras  * by Christos Zoulas.
92fe8fb19SBen Gras  *
102fe8fb19SBen Gras  * Redistribution and use in source and binary forms, with or without
112fe8fb19SBen Gras  * modification, are permitted provided that the following conditions
122fe8fb19SBen Gras  * are met:
132fe8fb19SBen Gras  * 1. Redistributions of source code must retain the above copyright
142fe8fb19SBen Gras  *    notice, this list of conditions and the following disclaimer.
152fe8fb19SBen Gras  * 2. Redistributions in binary form must reproduce the above copyright
162fe8fb19SBen Gras  *    notice, this list of conditions and the following disclaimer in the
172fe8fb19SBen Gras  *    documentation and/or other materials provided with the distribution.
182fe8fb19SBen Gras  *
192fe8fb19SBen Gras  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
202fe8fb19SBen Gras  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
212fe8fb19SBen Gras  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
222fe8fb19SBen Gras  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
232fe8fb19SBen Gras  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
242fe8fb19SBen Gras  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
252fe8fb19SBen Gras  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
262fe8fb19SBen Gras  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
272fe8fb19SBen Gras  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
282fe8fb19SBen Gras  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
292fe8fb19SBen Gras  * POSSIBILITY OF SUCH DAMAGE.
302fe8fb19SBen Gras  */
312fe8fb19SBen Gras 
322fe8fb19SBen Gras #include <sys/cdefs.h>
332fe8fb19SBen Gras #if defined(LIBC_SCCS) && !defined(lint)
34*f14fb602SLionel Sambuc __RCSID("$NetBSD: compat_getdents.c,v 1.6 2012/03/13 22:24:48 joerg Exp $");
352fe8fb19SBen Gras #endif /* LIBC_SCCS and not lint */
362fe8fb19SBen Gras 
372fe8fb19SBen Gras #define __LIBC12_SOURCE__
382fe8fb19SBen Gras 
392fe8fb19SBen Gras #include "namespace.h"
402fe8fb19SBen Gras #include <sys/types.h>
41*f14fb602SLionel Sambuc #include <assert.h>
422fe8fb19SBen Gras #include <dirent.h>
43*f14fb602SLionel Sambuc #include <stddef.h>
442fe8fb19SBen Gras #include <compat/include/dirent.h>
452fe8fb19SBen Gras #include <string.h>
462fe8fb19SBen Gras 
472fe8fb19SBen Gras /*
482fe8fb19SBen Gras  * libc12 compatible getdents routine.
492fe8fb19SBen Gras  */
502fe8fb19SBen Gras int
getdents(int fd,char * buf,size_t nbytes)512fe8fb19SBen Gras getdents(int fd, char *buf, size_t nbytes)
522fe8fb19SBen Gras {
532fe8fb19SBen Gras 	struct dirent *ndp, *nndp, *endp;
542fe8fb19SBen Gras 	struct dirent12 *odp;
55*f14fb602SLionel Sambuc 	ino_t ino;
562fe8fb19SBen Gras 	int rv;
57*f14fb602SLionel Sambuc 	size_t len;
582fe8fb19SBen Gras 
592fe8fb19SBen Gras 	if ((rv = __getdents30(fd, buf, nbytes)) == -1)
602fe8fb19SBen Gras 		return rv;
612fe8fb19SBen Gras 
622fe8fb19SBen Gras 	odp = (struct dirent12 *)(void *)buf;
632fe8fb19SBen Gras 	ndp = (struct dirent *)(void *)buf;
642fe8fb19SBen Gras 	endp = (struct dirent *)(void *)&buf[rv];
652fe8fb19SBen Gras 
662fe8fb19SBen Gras 	/*
672fe8fb19SBen Gras 	 * In-place conversion. This works because odp
682fe8fb19SBen Gras 	 * is smaller than ndp, but it has to be done
692fe8fb19SBen Gras 	 * in the right sequence.
702fe8fb19SBen Gras 	 */
712fe8fb19SBen Gras 	for (; ndp < endp; ndp = nndp) {
722fe8fb19SBen Gras 		nndp = _DIRENT_NEXT(ndp);
732fe8fb19SBen Gras 		/* XXX: avoid unaligned 64-bit access on sparc64 */
74*f14fb602SLionel Sambuc 		/* XXX: does this work? */
75*f14fb602SLionel Sambuc 		memcpy(&ino, &ndp->d_ino, sizeof(ino_t));
76*f14fb602SLionel Sambuc 		odp->d_ino = (uint32_t)ino;
772fe8fb19SBen Gras 		if (ndp->d_namlen >= sizeof(odp->d_name))
782fe8fb19SBen Gras 			odp->d_namlen = sizeof(odp->d_name) - 1;
792fe8fb19SBen Gras 		else
802fe8fb19SBen Gras 			odp->d_namlen = (u_int8_t)ndp->d_namlen;
812fe8fb19SBen Gras 		odp->d_type = ndp->d_type;
822fe8fb19SBen Gras 		(void)memcpy(odp->d_name, ndp->d_name, (size_t)odp->d_namlen);
832fe8fb19SBen Gras 		odp->d_name[odp->d_namlen] = '\0';
84*f14fb602SLionel Sambuc 		len = _DIRENT_SIZE(odp);
85*f14fb602SLionel Sambuc 		_DIAGASSERT(__type_fit(uint16_t, len));
86*f14fb602SLionel Sambuc 		odp->d_reclen = (uint16_t)len;
872fe8fb19SBen Gras 		odp = _DIRENT_NEXT(odp);
882fe8fb19SBen Gras 	}
89*f14fb602SLionel Sambuc 	ptrdiff_t td = (((char *)(void *)odp) - buf);
90*f14fb602SLionel Sambuc 	_DIAGASSERT(__type_fit(int, td));
91*f14fb602SLionel Sambuc 	return (int)td;
922fe8fb19SBen Gras }
93