1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/endian.c	Sun Oct 29 13:21:11 2017 +0200
     1.3 @@ -0,0 +1,58 @@
     1.4 +#include "endian.h"
     1.5 +
     1.6 +#ifdef NO_INET
     1.7 +static uint32_t init_once32(uint32_t x);
     1.8 +static uint16_t init_once16(uint16_t x);
     1.9 +
    1.10 +static uint16_t swap16(uint16_t x);
    1.11 +static uint32_t swap32(uint32_t x);
    1.12 +static uint16_t nop16(uint16_t x);
    1.13 +static uint32_t nop32(uint32_t x);
    1.14 +
    1.15 +uint16_t (*ntohs)(uint16_t) = init_once16;
    1.16 +uint16_t (*htons)(uint16_t) = init_once16;
    1.17 +uint32_t (*ntohl)(uint32_t) = init_once32;
    1.18 +uint32_t (*htonl)(uint32_t) = init_once32;
    1.19 +
    1.20 +static uint16_t init_once16(uint16_t x)
    1.21 +{
    1.22 +	int be = bigendian();
    1.23 +	ntohs = be ? nop16 : swap16;
    1.24 +	htons = be ? nop16 : swap16;
    1.25 +	return ntohs(x);
    1.26 +}
    1.27 +
    1.28 +static uint32_t init_once32(uint32_t x)
    1.29 +{
    1.30 +	int be = bigendian();
    1.31 +	ntohl = be ? nop32 : swap32;
    1.32 +	htonl = be ? nop32 : swap32;
    1.33 +	return ntohl(x);
    1.34 +}
    1.35 +
    1.36 +static uint16_t swap16(uint16_t x)
    1.37 +{
    1.38 +	return (x << 8) | (x >> 8);
    1.39 +}
    1.40 +
    1.41 +static uint32_t swap32(uint32_t x)
    1.42 +{
    1.43 +	return (x << 24) | (x >> 24) | ((x << 16) & 0xff0000) | ((x >> 16) & 0xff00);
    1.44 +}
    1.45 +
    1.46 +static uint16_t nop16(uint16_t x)
    1.47 +{
    1.48 +	return x;
    1.49 +}
    1.50 +
    1.51 +static uint32_t nop32(uint32_t x)
    1.52 +{
    1.53 +	return x;
    1.54 +}
    1.55 +#endif
    1.56 +
    1.57 +int bigendian(void)
    1.58 +{
    1.59 +	static const uint16_t x = 0xaabb;
    1.60 +	return *(unsigned char*)&x == 0xaa;
    1.61 +}