scan: String Parsing

API

int scan_fromhex(unsigned char c)

size_t scan_ulong(const char *src, unsigned long int *dst)

size_t scan_xlong(const char *src, unsigned long *dst)

unsigned int scan_ip4(const char *src, ip4_t ip)

unsigned int scan_ip6(const char *src, ip6_t ip)

unsigned int scan_ip6_flat(const char *src, ip6_t ip)