+ do {
+ line_len = getline (&line, &line_size, input);
+
+ /* empty input file not considered an error */
+ if (line_len < 0)
+ return 0;
+
+ } while ((line_len == 0) ||
+ (line[0] == '#') ||
+ /* the cast is safe because we checked about for line_len < 0 */
+ (strspn (line, " \t\n") == (unsigned)line_len));
+
+ char *p;