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33 * $FreeBSD: src/lib/libc/gen/scandir.c,v 1.5.6.1 2001/03/05 09:52:13 obrien Exp $
34 * $DragonFly: src/lib/libc/gen/scandir.c,v 1.5 2005/01/31 22:29:15 dillon Exp $
36 * @(#)scandir.c 8.3 (Berkeley) 1/2/94
40 * Scan the directory dirname calling select to make a list of selected
41 * directory entries then sort using qsort and compare routine dcomp.
42 * Returns the number of entries and a pointer to a list of pointers to
43 * struct dirent (through namelist). Returns -1 if there were any errors.
46 #include "namespace.h"
47 #include <sys/types.h>
52 #include "un-namespace.h"
55 * The DIRSIZ macro is the minimum record length which will hold the directory
56 * entry. This requires the amount of space in struct dirent without the
57 * d_name field, plus enough space for the name and a terminating nul byte
58 * (dp->d_namlen + 1), rounded up to a 4 byte boundary.
62 ((sizeof(struct dirent) - sizeof(dp)->d_name) + \
63 (((dp)->d_namlen + 1 + 3) &~ 3))
66 scandir(dirname, namelist, select, dcomp)
68 struct dirent ***namelist;
69 int (*select) (struct dirent *);
70 int (*dcomp) (const void *, const void *);
72 struct dirent *d, *p, **names = NULL;
78 if ((dirp = opendir(dirname)) == NULL)
80 if (_fstat(dirp->dd_fd, &stb) < 0)
84 * estimate the array size by taking the size of the directory file
85 * and dividing it by a multiple of the minimum size entry.
87 arraysz = (stb.st_size / 24);
88 names = (struct dirent **)malloc(arraysz * sizeof(struct dirent *));
92 while ((d = readdir(dirp)) != NULL) {
93 if (select != NULL && !(*select)(d))
94 continue; /* just selected names */
96 * Make a minimum size copy of the data
98 p = (struct dirent *)malloc(DIRSIZ(d));
101 p->d_fileno = d->d_fileno;
102 p->d_type = d->d_type;
103 p->d_reclen = d->d_reclen;
104 p->d_namlen = d->d_namlen;
105 bcopy(d->d_name, p->d_name, p->d_namlen + 1);
107 * Check to make sure the array has space left and
108 * realloc the maximum size.
110 if (nitems >= arraysz) {
111 const int inc = 10; /* increase by this much */
112 struct dirent **names2;
114 names2 = (struct dirent **)realloc((char *)names,
115 (arraysz + inc) * sizeof(struct dirent *));
116 if (names2 == NULL) {
126 if (nitems && dcomp != NULL)
127 qsort(names, nitems, sizeof(struct dirent *), dcomp);
133 free(names[--nitems]);
140 * Alphabetic order comparison routine for those who want it.
147 return(strcmp((*(struct dirent **)d1)->d_name,
148 (*(struct dirent **)d2)->d_name));