nuclear@7: #include "endian.h"
nuclear@7: 
nuclear@7: #ifdef NO_INET
nuclear@7: static uint32_t init_once32(uint32_t x);
nuclear@7: static uint16_t init_once16(uint16_t x);
nuclear@7: 
nuclear@7: static uint16_t swap16(uint16_t x);
nuclear@7: static uint32_t swap32(uint32_t x);
nuclear@7: static uint16_t nop16(uint16_t x);
nuclear@7: static uint32_t nop32(uint32_t x);
nuclear@7: 
nuclear@7: uint16_t (*ntohs)(uint16_t) = init_once16;
nuclear@7: uint16_t (*htons)(uint16_t) = init_once16;
nuclear@7: uint32_t (*ntohl)(uint32_t) = init_once32;
nuclear@7: uint32_t (*htonl)(uint32_t) = init_once32;
nuclear@7: 
nuclear@7: static uint16_t init_once16(uint16_t x)
nuclear@7: {
nuclear@7: 	int be = bigendian();
nuclear@7: 	ntohs = be ? nop16 : swap16;
nuclear@7: 	htons = be ? nop16 : swap16;
nuclear@7: 	return ntohs(x);
nuclear@7: }
nuclear@7: 
nuclear@7: static uint32_t init_once32(uint32_t x)
nuclear@7: {
nuclear@7: 	int be = bigendian();
nuclear@7: 	ntohl = be ? nop32 : swap32;
nuclear@7: 	htonl = be ? nop32 : swap32;
nuclear@7: 	return ntohl(x);
nuclear@7: }
nuclear@7: 
nuclear@7: static uint16_t swap16(uint16_t x)
nuclear@7: {
nuclear@7: 	return (x << 8) | (x >> 8);
nuclear@7: }
nuclear@7: 
nuclear@7: static uint32_t swap32(uint32_t x)
nuclear@7: {
nuclear@7: 	return (x << 24) | (x >> 24) | ((x << 16) & 0xff0000) | ((x >> 16) & 0xff00);
nuclear@7: }
nuclear@7: 
nuclear@7: static uint16_t nop16(uint16_t x)
nuclear@7: {
nuclear@7: 	return x;
nuclear@7: }
nuclear@7: 
nuclear@7: static uint32_t nop32(uint32_t x)
nuclear@7: {
nuclear@7: 	return x;
nuclear@7: }
nuclear@7: #endif
nuclear@7: 
nuclear@7: int bigendian(void)
nuclear@7: {
nuclear@7: 	static const uint16_t x = 0xaabb;
nuclear@7: 	return *(unsigned char*)&x == 0xaa;
nuclear@7: }