Add a "fork" of musl as //fusl.

fusl/src/dirent/scandir.c

+#include <dirent.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <errno.h>
+#include <stddef.h>
+#include "libc.h"
+
+int scandir(const char *path, struct dirent ***res,
+        int (*sel)(const struct dirent *),
+        int (*cmp)(const struct dirent **, const struct dirent **))
+{
+        DIR *d = opendir(path);
+        struct dirent *de, **names=0, **tmp;
+        size_t cnt=0, len=0;
+        int old_errno = errno;
+
+        if (!d) return -1;
+
+        while ((errno=0), (de = readdir(d))) {
+                if (sel && !sel(de)) continue;
+                if (cnt >= len) {
+                        len = 2*len+1;
+                        if (len > SIZE_MAX/sizeof *names) break;
+                        tmp = realloc(names, len * sizeof *names);
+                        if (!tmp) break;
+                        names = tmp;
+                }
+                names[cnt] = malloc(de->d_reclen);
+                if (!names[cnt]) break;
+                memcpy(names[cnt++], de, de->d_reclen);
+        }
+
+        closedir(d);
+
+        if (errno) {
+                if (names) while (cnt-->0) free(names[cnt]);
+                free(names);
+                return -1;
+        }
+        errno = old_errno;
+
+        if (cmp) qsort(names, cnt, sizeof *names, (int (*)(const void *, const void *))cmp);
+        *res = names;
+        return cnt;
+}
+
+LFS64(scandir);