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netinclude
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endian.h
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C/C++ Source or Header
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1997-12-04
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1KB
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45 lines
#ifndef _MACHINE_ENDIAN_H_
#define _MACHINE_ENDIAN_H_
#ifndef _SYS_TYPES_H_
#include <sys/types.h>
#endif
/*
* Definitions for byte order, according to byte significance from low
* address to high.
*/
#define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
#define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
#define BYTE_ORDER BIG_ENDIAN
unsigned long htonl(unsigned long);
unsigned short htons(unsigned short);
unsigned long ntohl(unsigned long);
unsigned short ntohs(unsigned short);
/*
* Macros for network/external number representation conversion.
*/
#if BYTE_ORDER == BIG_ENDIAN && !defined(lint)
#define ntohl(x) (x)
#define ntohs(x) (x)
#define htonl(x) (x)
#define htons(x) (x)
#define NTOHL(x) (x)
#define NTOHS(x) (x)
#define HTONL(x) (x)
#define HTONS(x) (x)
#else
#define NTOHL(x) (x) = ntohl((u_long)x)
#define NTOHS(x) (x) = ntohs((u_short)x)
#define HTONL(x) (x) = htonl((u_long)x)
#define HTONS(x) (x) = htons((u_short)x)
#endif
#endif /* !_ENDIAN_H_ */