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