1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/* $OpenBSD: scandir.c,v 1.12 2007/09/02 15:19:16 deraadt Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Scan the directory dirname calling select to make a list of selected
* directory entries then sort using qsort and compare routine dcomp.
* Returns the number of entries and a pointer to a list of pointers to
* struct dirent (through namelist). Returns -1 if there were any errors.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
/*
* The DIRSIZ macro is the minimum record length which will hold the directory
* entry. This requires the amount of space in struct dirent without the
* d_name field, plus enough space for the name and a terminating nul byte
* (dp->d_namlen + 1), rounded up to a 4 byte boundary.
*/
#undef DIRSIZ
#define DIRSIZ(dp) \
((sizeof(struct dirent) - sizeof(dp)->d_name) + \
(((dp)->d_namlen + 1 + 3) &~ 3))
int
scandir(const char *dirname, struct dirent ***namelist,
int (*select)(struct dirent *), int (*dcomp)(const void *, const void *))
{
struct dirent *d, *p, **names = NULL;
size_t nitems = 0;
struct stat stb;
long arraysz;
DIR *dirp;
if ((dirp = opendir(dirname)) == NULL)
return (-1);
if (fstat(dirp->dd_fd, &stb) < 0)
goto fail;
/*
* estimate the array size by taking the size of the directory file
* and dividing it by a multiple of the minimum size entry.
*/
arraysz = MAX(stb.st_size / 24, 16);
if (arraysz > SIZE_MAX / sizeof(struct dirent *)) {
errno = ENOMEM;
goto fail;
}
names = (struct dirent **)calloc(arraysz, sizeof(struct dirent *));
if (names == NULL)
goto fail;
while ((d = readdir(dirp)) != NULL) {
if (select != NULL && !(*select)(d))
continue; /* just selected names */
/*
* Check to make sure the array has space left and
* realloc the maximum size.
*/
if (nitems >= arraysz) {
struct dirent **nnames;
if (fstat(dirp->dd_fd, &stb) < 0)
goto fail;
arraysz *= 2;
if (SIZE_MAX / sizeof(struct dirent *) < arraysz)
goto fail;
nnames = (struct dirent **)realloc((char *)names,
arraysz * sizeof(struct dirent *));
if (nnames == NULL)
goto fail;
names = nnames;
}
/*
* Make a minimum size copy of the data
*/
p = (struct dirent *)malloc(DIRSIZ(d));
if (p == NULL)
goto fail;
p->d_ino = d->d_ino;
p->d_type = d->d_type;
p->d_reclen = d->d_reclen;
p->d_namlen = d->d_namlen;
bcopy(d->d_name, p->d_name, p->d_namlen + 1);
names[nitems++] = p;
}
closedir(dirp);
if (nitems && dcomp != NULL)
qsort(names, nitems, sizeof(struct dirent *), dcomp);
*namelist = names;
return (nitems);
fail:
while (nitems > 0)
free(names[--nitems]);
free(names);
closedir(dirp);
return (-1);
}
/*
* Alphabetic order comparison routine for those who want it.
*/
int
alphasort(const void *d1, const void *d2)
{
return(strcmp((*(struct dirent **)d1)->d_name,
(*(struct dirent **)d2)->d_name));
}
|
