xref: /onnv-gate/usr/src/lib/libbc/libc/sys/common/getdents.c (revision 0:68f95e015346)
1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate  * CDDL HEADER START
3*0Sstevel@tonic-gate  *
4*0Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*0Sstevel@tonic-gate  * with the License.
8*0Sstevel@tonic-gate  *
9*0Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate  * and limitations under the License.
13*0Sstevel@tonic-gate  *
14*0Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate  *
20*0Sstevel@tonic-gate  * CDDL HEADER END
21*0Sstevel@tonic-gate  */
22*0Sstevel@tonic-gate /*
23*0Sstevel@tonic-gate  * Copyright 1994 Sun Microsystems, Inc.  All rights reserved.
24*0Sstevel@tonic-gate  * Use is subject to license terms.
25*0Sstevel@tonic-gate  */
26*0Sstevel@tonic-gate 
27*0Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
28*0Sstevel@tonic-gate 
29*0Sstevel@tonic-gate #include <unistd.h>
30*0Sstevel@tonic-gate #include <sys/types.h>
31*0Sstevel@tonic-gate #include <sys/dirent.h>
32*0Sstevel@tonic-gate #include <sys/syscall.h>
33*0Sstevel@tonic-gate #include <sys/param.h>
34*0Sstevel@tonic-gate #include <sys/errno.h>
35*0Sstevel@tonic-gate 
36*0Sstevel@tonic-gate #define	ALIGN	4
37*0Sstevel@tonic-gate 
38*0Sstevel@tonic-gate extern int errno;
39*0Sstevel@tonic-gate 
40*0Sstevel@tonic-gate struct n_dirent{
41*0Sstevel@tonic-gate 	unsigned long	d_ino;
42*0Sstevel@tonic-gate 	long		d_off;
43*0Sstevel@tonic-gate 	unsigned short	d_reclen;
44*0Sstevel@tonic-gate 	char		d_name[1];
45*0Sstevel@tonic-gate };
46*0Sstevel@tonic-gate 
47*0Sstevel@tonic-gate 
getdents(fd,buf,bytes)48*0Sstevel@tonic-gate int getdents(fd, buf, bytes)
49*0Sstevel@tonic-gate int fd;
50*0Sstevel@tonic-gate char *buf;
51*0Sstevel@tonic-gate int bytes;
52*0Sstevel@tonic-gate {
53*0Sstevel@tonic-gate 	return(bc_getdents(fd, buf, bytes));
54*0Sstevel@tonic-gate }
55*0Sstevel@tonic-gate 
56*0Sstevel@tonic-gate 
bc_getdents(fd,buf,bytes)57*0Sstevel@tonic-gate int bc_getdents(fd, buf, bytes)
58*0Sstevel@tonic-gate int fd;
59*0Sstevel@tonic-gate char *buf;
60*0Sstevel@tonic-gate int bytes;
61*0Sstevel@tonic-gate {
62*0Sstevel@tonic-gate 	int ret, nbytes;
63*0Sstevel@tonic-gate 	char *nbuf;
64*0Sstevel@tonic-gate 	struct dirent *dir;
65*0Sstevel@tonic-gate 	struct n_dirent *ndir;
66*0Sstevel@tonic-gate 	int count=0;
67*0Sstevel@tonic-gate 	off_t last_off;
68*0Sstevel@tonic-gate 
69*0Sstevel@tonic-gate 	if (buf == (char *)0 || buf == (char *)-1) {
70*0Sstevel@tonic-gate 		errno = EFAULT;
71*0Sstevel@tonic-gate 		return(-1);
72*0Sstevel@tonic-gate 	}
73*0Sstevel@tonic-gate 
74*0Sstevel@tonic-gate 	nbytes = bytes; /* buffer can only be as large as user expects */
75*0Sstevel@tonic-gate 
76*0Sstevel@tonic-gate 	if ((nbuf = (char *)malloc(nbytes)) == NULL) {
77*0Sstevel@tonic-gate 		return(-1);
78*0Sstevel@tonic-gate 	}
79*0Sstevel@tonic-gate 
80*0Sstevel@tonic-gate 	if ((ret = _syscall(SYS_getdents, fd, nbuf, nbytes)) == -1) {
81*0Sstevel@tonic-gate 		free(nbuf);
82*0Sstevel@tonic-gate 		return(ret);
83*0Sstevel@tonic-gate 	}
84*0Sstevel@tonic-gate 
85*0Sstevel@tonic-gate 
86*0Sstevel@tonic-gate 	dir = (struct dirent *)buf;
87*0Sstevel@tonic-gate 	ndir = (struct n_dirent *)nbuf;	/* source directory format */
88*0Sstevel@tonic-gate 
89*0Sstevel@tonic-gate 	while ((((int)(((char *)dir) + sizeof(struct n_dirent) +
90*0Sstevel@tonic-gate 	    strlen(ndir->d_name) + ALIGN) & ~(ALIGN - 1)) <
91*0Sstevel@tonic-gate 	    (int)(buf + bytes)) &&
92*0Sstevel@tonic-gate 	    ((char *)ndir + sizeof(struct n_dirent) <= (nbuf + ret))) {
93*0Sstevel@tonic-gate 		dir->d_off = ndir->d_off;
94*0Sstevel@tonic-gate 		dir->d_fileno = ndir->d_ino;	/* NOT VALID */
95*0Sstevel@tonic-gate 		dir->d_namlen = strlen(ndir->d_name);
96*0Sstevel@tonic-gate 		dir->d_reclen = (short)((sizeof(struct dirent) - MAXNAMLEN +
97*0Sstevel@tonic-gate 		    dir->d_namlen + ALIGN) & -ALIGN);
98*0Sstevel@tonic-gate 		strncpy(dir->d_name, ndir->d_name, dir->d_namlen);
99*0Sstevel@tonic-gate 		dir->d_name[dir->d_namlen] = '\0';
100*0Sstevel@tonic-gate 		count += dir->d_reclen;
101*0Sstevel@tonic-gate 		last_off = ndir->d_off;
102*0Sstevel@tonic-gate 		dir  = (struct dirent *)((char *)dir +
103*0Sstevel@tonic-gate 				    ((int)( dir->d_reclen)));
104*0Sstevel@tonic-gate 		ndir = (struct n_dirent *)((char *)ndir +
105*0Sstevel@tonic-gate 				    ((int)(ndir->d_reclen)));
106*0Sstevel@tonic-gate 	}
107*0Sstevel@tonic-gate 
108*0Sstevel@tonic-gate 	/*
109*0Sstevel@tonic-gate 	 * Seek to the next entry in the directory. If all entries
110*0Sstevel@tonic-gate 	 * in ndir were not copied to dir, the next getdents syscall
111*0Sstevel@tonic-gate 	 * will start reading from there.
112*0Sstevel@tonic-gate 	 */
113*0Sstevel@tonic-gate 	(void)lseek(fd, last_off, SEEK_SET);
114*0Sstevel@tonic-gate 	free(nbuf);
115*0Sstevel@tonic-gate 	return(count);
116*0Sstevel@tonic-gate }
117