2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
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13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)scandir.c 8.3 (Berkeley) 1/2/94";
32 #endif /* LIBC_SCCS and not lint */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
37 * Scan the directory dirname calling select to make a list of selected
38 * directory entries then sort using qsort and compare routine dcomp.
39 * Returns the number of entries and a pointer to a list of pointers to
40 * struct dirent (through namelist). Returns -1 if there were any errors.
43 #include "namespace.h"
44 #include <sys/types.h>
49 #include "un-namespace.h"
52 * The DIRSIZ macro is the minimum record length which will hold the directory
53 * entry. This requires the amount of space in struct dirent without the
54 * d_name field, plus enough space for the name and a terminating nul byte
55 * (dp->d_namlen + 1), rounded up to a 4 byte boundary.
59 ((sizeof(struct dirent) - sizeof(dp)->d_name) + \
60 (((dp)->d_namlen + 1 + 3) &~ 3))
63 scandir(dirname, namelist, select, dcomp)
65 struct dirent ***namelist;
66 int (*select)(struct dirent *);
67 int (*dcomp)(const void *, const void *);
69 struct dirent *d, *p, **names = NULL;
75 if ((dirp = opendir(dirname)) == NULL)
77 if (_fstat(dirp->dd_fd, &stb) < 0)
81 * estimate the array size by taking the size of the directory file
82 * and dividing it by a multiple of the minimum size entry.
84 arraysz = (stb.st_size / 24);
85 names = (struct dirent **)malloc(arraysz * sizeof(struct dirent *));
89 while ((d = readdir(dirp)) != NULL) {
90 if (select != NULL && !(*select)(d))
91 continue; /* just selected names */
93 * Make a minimum size copy of the data
95 p = (struct dirent *)malloc(DIRSIZ(d));
98 p->d_fileno = d->d_fileno;
99 p->d_type = d->d_type;
100 p->d_reclen = d->d_reclen;
101 p->d_namlen = d->d_namlen;
102 bcopy(d->d_name, p->d_name, p->d_namlen + 1);
104 * Check to make sure the array has space left and
105 * realloc the maximum size.
107 if (nitems >= arraysz) {
108 const int inc = 10; /* increase by this much */
109 struct dirent **names2;
111 names2 = (struct dirent **)realloc((char *)names,
112 (arraysz + inc) * sizeof(struct dirent *));
113 if (names2 == NULL) {
123 if (nitems && dcomp != NULL)
124 qsort(names, nitems, sizeof(struct dirent *), dcomp);
130 free(names[--nitems]);
137 * Alphabetic order comparison routine for those who want it.
144 return(strcmp((*(struct dirent **)d1)->d_name,
145 (*(struct dirent **)d2)->d_name));