-if (!buffer && !(buffer = US malloc(size))) return NULL;
-if (!(buffer = getcwd((char *)buffer, size))) return NULL;
-return realloc((char *)buffer, strlen(buffer) + 1);
+if (!b && !(b = malloc(size))) return NULL;
+if (!(b = getcwd(b, size))) return NULL;
+return realloc(b, strlen(b) + 1);