ifsval
ifs = ifsset() ? ifsval() : " \t\n";
strchr(ifsset() ? ifsval() : " \t\n", c) != NULL) {
strchr(ifsset() ? ifsval() : " \t\n", c) != NULL) {
strchr(ifsset() ? ifsval() : " \t\n", c) != NULL) {
ifs = ifsset() ? ifsval() : " \t\n";
sep[0] = ifsval()[0];