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}