ISALNUM
if (ISALNUM(***seg) && *(*seg + 2)) {
if ((isbuilding == 0) && !ISALNUM(c)) {
if (!ISALNUM(sv_peek(sv, 0)))
if (ISALNUM(c) || c == '_')
if (!ISALNUM(reg->ereg_name[i])) {
if (!ISALNUM(reg->ic_name[i])) {
if (ISALNUM(data[i]) == 0 || data[i] == ' ') {
return (ISALNUM(c));