When printing an error message, don't choke if tok->buf is NULL.

Parser/parsetok.c

@@ -89,6 +89,9 @@ parsefile(fp, filename, g, start, ps1, ps2, n_ret)
 		char *p;
 		fprintf(stderr, "Parsing error: file %s, line %d:\n",
 						filename, tok->lineno);
+		if (tok->buf == NULL)
+			fprintf(stderr, "(EOF)\n");
+		else {
 			*tok->inp = '\0';
 			if (tok->inp > tok->buf && tok->inp[-1] == '\n')
 				tok->inp[-1] = '\0';
@@ -101,6 +104,7 @@ parsefile(fp, filename, g, start, ps1, ps2, n_ret)
 			}
 			fprintf(stderr, "^\n");
 		}
+	}
 	tok_free(tok);
 	return ret;
 }