1#include <dirent.h>
2#include <string.h>
3#include <stdlib.h>
4#include <stdint.h>
5#include <errno.h>
6#include <stddef.h>
7
8int scandir(const char *path, struct dirent ***res,
9	int (*sel)(const struct dirent *),
10	int (*cmp)(const struct dirent **, const struct dirent **))
11{
12	DIR *d;
13	struct dirent *de, **names=0, **tmp;
14	size_t cnt=0, len=0;
15	int old_errno = errno;
16	d = opendir(path);
17
18	if (!d) return -1;
19
20	while ((errno=0), (de = readdir(d))) {
21		if (sel && !sel(de)) continue;
22		if (cnt >= len) {
23			len = 2*len+1;
24			if (len > SIZE_MAX/sizeof *names) break;
25			tmp = realloc(names, len * sizeof *names);
26			if (!tmp) break;
27			names = tmp;
28		}
29		names[cnt] = malloc(de->d_reclen);
30		if (!names[cnt]) break;
31		memcpy(names[cnt++], de, de->d_reclen);
32	}
33
34	closedir(d);
35
36	if (errno) {
37		if (names) while (cnt-->0) free(names[cnt]);
38		free(names);
39		return -1;
40	}
41	errno = old_errno;
42
43	if (cmp) qsort(names, cnt, sizeof *names, (int (*)(const void *, const void *))cmp);
44	*res = names;
45	return cnt;
46}
47