主机序和网络序转换

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主机序和网络序

uint32_t htonl(uint32_t hostlong);uint16_t htons(uint16_t hostshort);uint32_t ntohl(uint32_t netlong);uint16_t ntohs(uint16_t netshort);

网络序和点分十进制

int inet_aton(const char *cp, struct in_addr *inp);char *inet_ntoa(struct in_addr in);int inet_pton(int af, const char *src, void *dst);const char *inet_ntop(int af, const void *src, char *dst, socklen_t size);typedef uint32_t in_addr_t;struct in_addr{    in_addr_t s_addr;};

af：AF_INET、AF_INET6

inet_aton

char *ip = "127.0.0.1";struct in_addr in = {0};inet_aton(ip, &in);printf("in_addr: %x\n", *(unsigned int*)&in);# ./a.outin_addr: 100007f

inet_ntoa

uint32_t addr = 0x100007f;char *ip = inet_ntoa(*(struct in_addr*)&addr);printf("ip: %s\n", ip);# ./a.out ip: 127.0.0.1

inet_pton

char *ip = "127.0.0.1";struct in_addr in = {0};inet_pton(AF_INET, ip, (void*)&in);printf("in_addr: %x\n", *(unsigned int*)&in);# ./a.outin_addr: 100007f

inet_ntop

uint32_t addr = 0x100007f;char ip[20] = {0};inet_ntop(AF_INET, (void*)&addr, ip, sizeof(ip));printf("ip: %s\n", ip);# ./a.out ip: 127.0.0.1

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