readdirents(2) now properly reports ERANGE.

sortix/directory.cpp

@@ -81,6 +81,7 @@ namespace Sortix
 				// another one (provide as many as we can).
 				prev = dirent;
 				size_t bytesused = sizeof(sortix_dirent) + dirent->d_namelen + 1;
+				ASSERT(bytesused <= size);
 				size -= bytesused;
 				dirent = (sortix_dirent*) ( ((byte*) dirent) + bytesused );
 			}

sortix/fs/devfs.cpp

@@ -318,7 +318,7 @@ namespace Sortix
 		{
 			dirent->d_namelen = needed;
 			Error::Set(ERANGE);
-			return 0;
+			return -1;
 		}
 
 		Memory::Copy(dirent->d_name, name, namelen + 1);

sortix/fs/initfs.cpp

@@ -185,7 +185,7 @@ namespace Sortix
 		{
 			dirent->d_namelen = needed;
 			Error::Set(ERANGE);
-			return 0;
+			return -1;
 		}
 
 		Memory::Copy(dirent->d_name, name, namelen + 1);

sortix/fs/ramfs.cpp

@@ -223,7 +223,7 @@ namespace Sortix
 		{
 			dirent->d_namelen = needed;
 			Error::Set(ERANGE);
-			return 0;
+			return -1;
 		}
 
 		Memory::Copy(dirent->d_name, name, namelen + 1);