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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 | |
38 | static char sccsid[] = "@(#)dirent.c 5.1 (Berkeley) 3/7/91"; | |
39 | #endif /* not lint */ | |
40 | ||
41 | #include "shell.h" /* definitions for pointer, NULL, DIRENT, and BSD */ | |
42 | ||
43 | #if ! DIRENT | |
44 | ||
45 | #include <errno.h> | |
46 | #include <sys/types.h> | |
47 | #include <sys/stat.h> | |
48 | #include <fcntl.h> | |
49 | #include <dirent.h> | |
50 | ||
51 | #ifndef S_ISDIR /* macro to test for directory file */ | |
52 | #define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR) | |
53 | #endif | |
54 | ||
55 | #ifdef BSD | |
56 | ||
57 | #ifdef __STDC__ | |
58 | int stat(char *, struct stat *); | |
59 | #else | |
60 | int stat(); | |
61 | #endif | |
62 | ||
63 | ||
64 | /* | |
65 | * The BSD opendir routine doesn't check that what is being opened is a | |
66 | * directory, so we have to include the check in a wrapper routine. | |
67 | */ | |
68 | ||
69 | #undef opendir | |
70 | ||
71 | DIR * | |
72 | myopendir(dirname) | |
73 | char *dirname; /* name of directory */ | |
74 | { | |
75 | struct stat statb; | |
76 | ||
77 | if (stat(dirname, &statb) != 0 || ! S_ISDIR(statb.st_mode)) { | |
78 | errno = ENOTDIR; | |
79 | return NULL; /* not a directory */ | |
80 | } | |
81 | return opendir(dirname); | |
82 | } | |
83 | ||
84 | #else /* not BSD */ | |
85 | ||
86 | /* | |
87 | * Dirent routines for old style file systems. | |
88 | */ | |
89 | ||
90 | #ifdef __STDC__ | |
91 | pointer malloc(unsigned); | |
92 | void free(pointer); | |
93 | int open(char *, int, ...); | |
94 | int close(int); | |
95 | int fstat(int, struct stat *); | |
96 | #else | |
97 | pointer malloc(); | |
98 | void free(); | |
99 | int open(); | |
100 | int close(); | |
101 | int fstat(); | |
102 | #endif | |
103 | ||
104 | ||
105 | DIR * | |
106 | opendir(dirname) | |
107 | char *dirname; /* name of directory */ | |
108 | { | |
109 | register DIR *dirp; /* -> malloc'ed storage */ | |
110 | register int fd; /* file descriptor for read */ | |
111 | struct stat statb; /* result of fstat() */ | |
112 | ||
113 | #ifdef O_NDELAY | |
114 | fd = open(dirname, O_RDONLY|O_NDELAY); | |
115 | #else | |
116 | fd = open(dirname, O_RDONLY); | |
117 | #endif | |
118 | if (fd < 0) | |
119 | return NULL; /* errno set by open() */ | |
120 | ||
121 | if (fstat(fd, &statb) != 0 || !S_ISDIR(statb.st_mode)) { | |
122 | (void)close(fd); | |
123 | errno = ENOTDIR; | |
124 | return NULL; /* not a directory */ | |
125 | } | |
126 | ||
127 | if ((dirp = (DIR *)malloc(sizeof(DIR))) == NULL) { | |
128 | (void)close(fd); | |
129 | errno = ENOMEM; | |
130 | return NULL; /* not enough memory */ | |
131 | } | |
132 | ||
133 | dirp->dd_fd = fd; | |
134 | dirp->dd_nleft = 0; /* refill needed */ | |
135 | ||
136 | return dirp; | |
137 | } | |
138 | ||
139 | ||
140 | ||
141 | int | |
142 | closedir(dirp) | |
143 | register DIR *dirp; /* stream from opendir() */ | |
144 | { | |
145 | register int fd; | |
146 | ||
147 | if (dirp == NULL) { | |
148 | errno = EFAULT; | |
149 | return -1; /* invalid pointer */ | |
150 | } | |
151 | ||
152 | fd = dirp->dd_fd; | |
153 | free((pointer)dirp); | |
154 | return close(fd); | |
155 | } | |
156 | ||
157 | ||
158 | ||
159 | struct dirent * | |
160 | readdir(dirp) | |
161 | register DIR *dirp; /* stream from opendir() */ | |
162 | { | |
163 | register struct direct *dp; | |
164 | register char *p, *q; | |
165 | register int i; | |
166 | ||
167 | do { | |
168 | if ((dirp->dd_nleft -= sizeof (struct direct)) < 0) { | |
169 | if ((i = read(dirp->dd_fd, | |
170 | (char *)dirp->dd_buf, | |
171 | DIRBUFENT*sizeof(struct direct))) <= 0) { | |
172 | if (i == 0) | |
173 | errno = 0; /* unnecessary */ | |
174 | return NULL; /* EOF or error */ | |
175 | } | |
176 | dirp->dd_loc = dirp->dd_buf; | |
177 | dirp->dd_nleft = i - sizeof (struct direct); | |
178 | } | |
179 | dp = dirp->dd_loc++; | |
180 | } while (dp->d_ino == 0); | |
181 | dirp->dd_entry.d_ino = dp->d_ino; | |
182 | ||
183 | /* now copy the name, nul terminating it */ | |
184 | p = dp->d_name; | |
185 | q = dirp->dd_entry.d_name; | |
186 | i = DIRSIZ; | |
187 | while (--i >= 0 && *p != '\0') | |
188 | *q++ = *p++; | |
189 | *q = '\0'; | |
190 | return &dirp->dd_entry; | |
191 | } | |
192 | ||
193 | #endif /* BSD */ | |
194 | #endif /* DIRENT */ |