ruby_strtoul     2148 include/ruby/ruby.h unsigned long ruby_strtoul(const char *str, char **endptr, int base);
ruby_strtoul     2149 include/ruby/ruby.h #define STRTOUL(str, endptr, base) (ruby_strtoul((str), (endptr), (base)))
ruby_strtoul     5822 io.c                       fdsize = (int)ruby_strtoul(p, (char **)NULL, 10);