run-test262: handle scandir() results with DT_UNKNOWN d_type

In case the dirent items returned by scandir() have DT_UNKNOWN as
d_type it is not possible to assume they are "non directories", and
it is needed to stat() them to get the actual type.

Hence, tweak the existing bits to account for that:
- create an helper enum for file type to distinguish whether something
  is for sure a file, whether it is for sure a directory, or it is not
  known
- map d_type to the newly created enum
- adapt consider_test_file() to use the newly created enum, and case
  the file type is not known also to stat() the file to get the actual
  type

Author: pinotree

run-test262.c

@@ -31,6 +31,7 @@
 #include <ctype.h>
 #include <errno.h>
 #include <time.h>
+#include <sys/stat.h>
 
 #ifdef _WIN32
 #include <windows.h>
@@ -73,6 +74,12 @@ typedef struct namelist_t {
     int size;
 } namelist_t;
 
+enum file_type_t {
+    file_is_directory,
+    file_is_not_directory,
+    file_is_unknown,
+};
+
 long nthreads; // invariant: 0 < nthreads < countof(threads)
 js_thread_t threads[32];
 js_thread_t progress_thread;
@@ -407,7 +414,7 @@ static bool ispathsep(int c)
     return c == '/' || c == '\\';
 }
 
-static void consider_test_file(const char *path, const char *name, int is_dir)
+static void consider_test_file(const char *path, const char *name, enum file_type_t file_type)
 {
     size_t pathlen;
     char s[1024];
@@ -418,7 +425,11 @@ static void consider_test_file(const char *path, const char *name, int is_dir)
     while (pathlen > 0 && ispathsep(path[pathlen-1]))
         pathlen--;
     snprintf(s, sizeof(s), "%.*s/%s", (int)pathlen, path, name);
-    if (is_dir)
+    if (file_type == file_is_unknown) {
+        struct stat st;
+        file_type = stat(s, &st) == 0 && S_ISDIR(st.st_mode) ? file_is_directory : file_is_not_directory;
+    }
+    if (file_type == file_is_directory)
         find_test_files(s);
     else
         add_test_file(s);
@@ -437,7 +448,7 @@ static void find_test_files(const char *path)
         do {
             consider_test_file(path,
                                d.cFileName,
-                               d.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY);
+                               d.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY ? file_is_directory : file_is_not_directory);
         } while (FindNextFileA(h, &d));
         FindClose(h);
     }
@@ -448,7 +459,19 @@ static void find_test_files(const char *path)
     n = scandir(path, &ds, NULL, alphasort);
     for (i = 0; i < n; i++) {
         d = ds[i];
-        consider_test_file(path, d->d_name, d->d_type == DT_DIR);
+        enum file_type_t file_type;
+        switch (d->d_type) {
+        case DT_DIR:
+            file_type = file_is_directory;
+            break;
+        case DT_UNKNOWN:
+            file_type = file_is_unknown;
+            break;
+        default:
+            file_type = file_is_not_directory;
+            break;
+        }
+        consider_test_file(path, d->d_name, file_type);
         free(d);
     }
     free(ds);