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15637ed4 RG |
1 | /*- |
2 | * Copyright (c) 1991 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Kenneth Almquist. | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. All advertising materials mentioning features or use of this software | |
17 | * must display the following acknowledgement: | |
18 | * This product includes software developed by the University of | |
19 | * California, Berkeley and its contributors. | |
20 | * 4. Neither the name of the University nor the names of its contributors | |
21 | * may be used to endorse or promote products derived from this software | |
22 | * without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
34 | * SUCH DAMAGE. | |
35 | */ | |
36 | ||
37 | #ifndef lint | |
68de1ca3 AM |
38 | /*static char sccsid[] = "from: @(#)dirent.c 5.1 (Berkeley) 3/7/91";*/ |
39 | static char rcsid[] = "dirent.c,v 1.4 1993/08/01 18:58:21 mycroft Exp"; | |
15637ed4 RG |
40 | #endif /* not lint */ |
41 | ||
42 | #include "shell.h" /* definitions for pointer, NULL, DIRENT, and BSD */ | |
43 | ||
44 | #if ! DIRENT | |
45 | ||
46 | #include <errno.h> | |
47 | #include <sys/types.h> | |
48 | #include <sys/stat.h> | |
49 | #include <fcntl.h> | |
50 | #include <dirent.h> | |
51 | ||
52 | #ifndef S_ISDIR /* macro to test for directory file */ | |
53 | #define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR) | |
54 | #endif | |
55 | ||
56 | #ifdef BSD | |
57 | ||
58 | #ifdef __STDC__ | |
59 | int stat(char *, struct stat *); | |
60 | #else | |
61 | int stat(); | |
62 | #endif | |
63 | ||
64 | ||
65 | /* | |
66 | * The BSD opendir routine doesn't check that what is being opened is a | |
67 | * directory, so we have to include the check in a wrapper routine. | |
68 | */ | |
69 | ||
70 | #undef opendir | |
71 | ||
72 | DIR * | |
73 | myopendir(dirname) | |
74 | char *dirname; /* name of directory */ | |
75 | { | |
76 | struct stat statb; | |
77 | ||
78 | if (stat(dirname, &statb) != 0 || ! S_ISDIR(statb.st_mode)) { | |
79 | errno = ENOTDIR; | |
80 | return NULL; /* not a directory */ | |
81 | } | |
82 | return opendir(dirname); | |
83 | } | |
84 | ||
85 | #else /* not BSD */ | |
86 | ||
87 | /* | |
88 | * Dirent routines for old style file systems. | |
89 | */ | |
90 | ||
91 | #ifdef __STDC__ | |
92 | pointer malloc(unsigned); | |
93 | void free(pointer); | |
94 | int open(char *, int, ...); | |
95 | int close(int); | |
96 | int fstat(int, struct stat *); | |
97 | #else | |
98 | pointer malloc(); | |
99 | void free(); | |
100 | int open(); | |
101 | int close(); | |
102 | int fstat(); | |
103 | #endif | |
104 | ||
105 | ||
106 | DIR * | |
107 | opendir(dirname) | |
108 | char *dirname; /* name of directory */ | |
109 | { | |
110 | register DIR *dirp; /* -> malloc'ed storage */ | |
111 | register int fd; /* file descriptor for read */ | |
112 | struct stat statb; /* result of fstat() */ | |
113 | ||
114 | #ifdef O_NDELAY | |
115 | fd = open(dirname, O_RDONLY|O_NDELAY); | |
116 | #else | |
117 | fd = open(dirname, O_RDONLY); | |
118 | #endif | |
119 | if (fd < 0) | |
120 | return NULL; /* errno set by open() */ | |
121 | ||
122 | if (fstat(fd, &statb) != 0 || !S_ISDIR(statb.st_mode)) { | |
123 | (void)close(fd); | |
124 | errno = ENOTDIR; | |
125 | return NULL; /* not a directory */ | |
126 | } | |
127 | ||
128 | if ((dirp = (DIR *)malloc(sizeof(DIR))) == NULL) { | |
129 | (void)close(fd); | |
130 | errno = ENOMEM; | |
131 | return NULL; /* not enough memory */ | |
132 | } | |
133 | ||
134 | dirp->dd_fd = fd; | |
135 | dirp->dd_nleft = 0; /* refill needed */ | |
136 | ||
137 | return dirp; | |
138 | } | |
139 | ||
140 | ||
141 | ||
142 | int | |
143 | closedir(dirp) | |
144 | register DIR *dirp; /* stream from opendir() */ | |
145 | { | |
146 | register int fd; | |
147 | ||
148 | if (dirp == NULL) { | |
149 | errno = EFAULT; | |
150 | return -1; /* invalid pointer */ | |
151 | } | |
152 | ||
153 | fd = dirp->dd_fd; | |
154 | free((pointer)dirp); | |
155 | return close(fd); | |
156 | } | |
157 | ||
158 | ||
159 | ||
160 | struct dirent * | |
161 | readdir(dirp) | |
162 | register DIR *dirp; /* stream from opendir() */ | |
163 | { | |
164 | register struct direct *dp; | |
165 | register char *p, *q; | |
166 | register int i; | |
167 | ||
168 | do { | |
169 | if ((dirp->dd_nleft -= sizeof (struct direct)) < 0) { | |
170 | if ((i = read(dirp->dd_fd, | |
171 | (char *)dirp->dd_buf, | |
172 | DIRBUFENT*sizeof(struct direct))) <= 0) { | |
173 | if (i == 0) | |
174 | errno = 0; /* unnecessary */ | |
175 | return NULL; /* EOF or error */ | |
176 | } | |
177 | dirp->dd_loc = dirp->dd_buf; | |
178 | dirp->dd_nleft = i - sizeof (struct direct); | |
179 | } | |
180 | dp = dirp->dd_loc++; | |
181 | } while (dp->d_ino == 0); | |
182 | dirp->dd_entry.d_ino = dp->d_ino; | |
183 | ||
184 | /* now copy the name, nul terminating it */ | |
185 | p = dp->d_name; | |
186 | q = dirp->dd_entry.d_name; | |
187 | i = DIRSIZ; | |
188 | while (--i >= 0 && *p != '\0') | |
189 | *q++ = *p++; | |
190 | *q = '\0'; | |
191 | return &dirp->dd_entry; | |
192 | } | |
193 | ||
194 | #endif /* BSD */ | |
195 | #endif /* DIRENT */ |