long abs_safe(int n)

int fits_in_int(long value)

int cmp_mixed(int a, unsigned int b)

int add_overflows(int a, int b)

void div_mod_floor(int a, int b, int *q, int *r)

int checked_size(size_t n, size_t size, size_t *out)

int money_format(long cents, char *out)