82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/*
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The following macro definitions convert to and from the network standard byte
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order. The macros with their name in lower case guarantee to evaluate their
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argument exactly once. The function of the macros is encoded in their names;
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htons means convert a (unsigned) short in host byte order to network byte order.
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*/
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#ifndef _NET__HTON_H
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#define _NET__HTON_H
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#include <minix/sys_config.h>
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extern u16_t _tmp;
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extern u32_t _tmp_l;
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/* Find out about the byte order. */
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/* assume <minix/config.h> is included, let's check */
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#if (_MINIX_CHIP == 0)
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#include "_MINIX_CHIP macro not set, include <minix/config.h>"
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#endif
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#if (_MINIX_CHIP == _CHIP_INTEL)
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#define LITTLE_ENDIAN 1
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#endif
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#if (_MINIX_CHIP == _CHIP_M68000 || _MINIX_CHIP == _CHIP_SPARC)
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#define BIG_ENDIAN 1
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#endif
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#if (LITTLE_ENDIAN) && (BIG_ENDIAN)
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#include "both LITTLE_ENDIAN and BIG_ENDIAN are defined"
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/* LITTLE_ENDIAN and BIG_ENDIAN are both defined */
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#endif
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#if !(LITTLE_ENDIAN) && !(BIG_ENDIAN)
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#include "neither LITTLE_ENDIAN nor BIG_ENDIAN is defined"
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/* LITTLE_ENDIAN and BIG_ENDIAN are both NOT defined */
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#endif
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#if LITTLE_ENDIAN
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#define HTONS(x) ( ( (((unsigned short)(x)) >>8) & 0xff) | \
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((((unsigned short)(x)) & 0xff)<<8) )
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#define NTOHS(x) ( ( (((unsigned short)(x)) >>8) & 0xff) | \
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((((unsigned short)(x)) & 0xff)<<8) )
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#define HTONL(x) ((((x)>>24) & 0xffL) | (((x)>>8) & 0xff00L) | \
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(((x)<<8) & 0xff0000L) | (((x)<<24) & 0xff000000L))
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#define NTOHL(x) ((((x)>>24) & 0xffL) | (((x)>>8) & 0xff00L) | \
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(((x)<<8) & 0xff0000L) | (((x)<<24) & 0xff000000L))
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#if _WORD_SIZE > 2
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#define htons(x) (_tmp=(x), ((_tmp>>8) & 0xff) | ((_tmp<<8) & 0xff00))
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#define ntohs(x) (_tmp=(x), ((_tmp>>8) & 0xff) | ((_tmp<<8) & 0xff00))
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#define htonl(x) (_tmp_l=(x), ((_tmp_l>>24) & 0xffL) | \
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((_tmp_l>>8) & 0xff00L) | \
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((_tmp_l<<8) & 0xff0000L) | ((_tmp_l<<24) & 0xff000000L))
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#define ntohl(x) (_tmp_l=(x), ((_tmp_l>>24) & 0xffL) \
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| ((_tmp_l>>8) & 0xff00L) | \
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((_tmp_l<<8) & 0xff0000L) | ((_tmp_l<<24) & 0xff000000L))
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#else /* _WORD_SIZE == 2 */
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/* The above macros are too unwieldy for a 16-bit machine. */
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u16_t htons(u16_t x);
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u16_t ntohs(u16_t x);
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u32_t htonl(u32_t x);
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u32_t ntohl(u32_t x);
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#endif /* _WORD_SIZE == 2 */
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#endif /* LITTLE_ENDIAN */
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#if BIG_ENDIAN
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#define htons(x) (x)
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#define HTONS(x) (x)
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#define ntohs(x) (x)
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#define NTOHS(x) (x)
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#define htonl(x) (x)
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#define HTONL(x) (x)
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#define ntohl(x) (x)
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#define NTOHL(x) (x)
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#endif /* BIG_ENDIAN */
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#endif /* _NET__HTON_H */
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