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 = opendir(path);
13	struct dirent *de, **names=0, **tmp;
14	size_t cnt=0, len=0;
15	int old_errno = errno;
16
17	if (!d) return -1;
18
19	while ((errno=0), (de = readdir(d))) {
20		if (sel && !sel(de)) continue;
21		if (cnt >= len) {
22			len = 2*len+1;
23			if (len > SIZE_MAX/sizeof *names) break;
24			tmp = realloc(names, len * sizeof *names);
25			if (!tmp) break;
26			names = tmp;
27		}
28		names[cnt] = malloc(de->d_reclen);
29		if (!names[cnt]) break;
30		memcpy(names[cnt++], de, de->d_reclen);
31	}
32
33	closedir(d);
34
35	if (errno) {
36		if (names) while (cnt-->0) free(names[cnt]);
37		free(names);
38		return -1;
39	}
40	errno = old_errno;
41
42	if (cmp) qsort(names, cnt, sizeof *names, (int (*)(const void *, const void *))cmp);
43	*res = names;
44	return cnt;
45}