| 1 | /*
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| 2 | The following macro definitions convert to and from the network standard byte
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| 3 | order. The macros with their name in lower case guarantee to evaluate their
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| 4 | argument exactly once. The function of the macros is encoded in their names;
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| 5 | htons means convert a (unsigned) short in host byte order to network byte order.
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| 6 | */
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| 7 |
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| 8 | #ifndef _NET__HTON_H
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| 9 | #define _NET__HTON_H
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| 10 |
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| 11 | #include <minix/sys_config.h>
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| 12 |
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| 13 | extern u16_t _tmp;
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| 14 | extern u32_t _tmp_l;
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| 15 |
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| 16 | /* Find out about the byte order. */
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| 17 |
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| 18 | /* assume <minix/config.h> is included, let's check */
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| 19 | #if (_MINIX_CHIP == 0)
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| 20 | #include "_MINIX_CHIP macro not set, include <minix/config.h>"
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| 21 | #endif
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| 22 |
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| 23 | #if (_MINIX_CHIP == _CHIP_INTEL)
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| 24 | #define LITTLE_ENDIAN 1
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| 25 | #endif
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| 26 |
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| 27 | #if (_MINIX_CHIP == _CHIP_M68000 || _MINIX_CHIP == _CHIP_SPARC)
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| 28 | #define BIG_ENDIAN 1
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| 29 | #endif
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| 30 |
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| 31 | #if (LITTLE_ENDIAN) && (BIG_ENDIAN)
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| 32 | #include "both LITTLE_ENDIAN and BIG_ENDIAN are defined"
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| 33 | /* LITTLE_ENDIAN and BIG_ENDIAN are both defined */
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| 34 | #endif
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| 35 |
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| 36 | #if !(LITTLE_ENDIAN) && !(BIG_ENDIAN)
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| 37 | #include "neither LITTLE_ENDIAN nor BIG_ENDIAN is defined"
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| 38 | /* LITTLE_ENDIAN and BIG_ENDIAN are both NOT defined */
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| 39 | #endif
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| 40 |
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| 41 | #if LITTLE_ENDIAN
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| 42 | #define HTONS(x) ( ( (((unsigned short)(x)) >>8) & 0xff) | \
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| 43 | ((((unsigned short)(x)) & 0xff)<<8) )
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| 44 | #define NTOHS(x) ( ( (((unsigned short)(x)) >>8) & 0xff) | \
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| 45 | ((((unsigned short)(x)) & 0xff)<<8) )
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| 46 | #define HTONL(x) ((((x)>>24) & 0xffL) | (((x)>>8) & 0xff00L) | \
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| 47 | (((x)<<8) & 0xff0000L) | (((x)<<24) & 0xff000000L))
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| 48 | #define NTOHL(x) ((((x)>>24) & 0xffL) | (((x)>>8) & 0xff00L) | \
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| 49 | (((x)<<8) & 0xff0000L) | (((x)<<24) & 0xff000000L))
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| 50 |
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| 51 | #if _WORD_SIZE > 2
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| 52 | #define htons(x) (_tmp=(x), ((_tmp>>8) & 0xff) | ((_tmp<<8) & 0xff00))
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| 53 | #define ntohs(x) (_tmp=(x), ((_tmp>>8) & 0xff) | ((_tmp<<8) & 0xff00))
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| 54 | #define htonl(x) (_tmp_l=(x), ((_tmp_l>>24) & 0xffL) | \
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| 55 | ((_tmp_l>>8) & 0xff00L) | \
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| 56 | ((_tmp_l<<8) & 0xff0000L) | ((_tmp_l<<24) & 0xff000000L))
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| 57 | #define ntohl(x) (_tmp_l=(x), ((_tmp_l>>24) & 0xffL) \
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| 58 | | ((_tmp_l>>8) & 0xff00L) | \
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| 59 | ((_tmp_l<<8) & 0xff0000L) | ((_tmp_l<<24) & 0xff000000L))
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| 60 |
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| 61 | #else /* _WORD_SIZE == 2 */
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| 62 | /* The above macros are too unwieldy for a 16-bit machine. */
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| 63 | u16_t htons(u16_t x);
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| 64 | u16_t ntohs(u16_t x);
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| 65 | u32_t htonl(u32_t x);
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| 66 | u32_t ntohl(u32_t x);
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| 67 | #endif /* _WORD_SIZE == 2 */
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| 68 |
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| 69 | #endif /* LITTLE_ENDIAN */
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| 70 |
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| 71 | #if BIG_ENDIAN
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| 72 | #define htons(x) (x)
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| 73 | #define HTONS(x) (x)
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| 74 | #define ntohs(x) (x)
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| 75 | #define NTOHS(x) (x)
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| 76 | #define htonl(x) (x)
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| 77 | #define HTONL(x) (x)
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| 78 | #define ntohl(x) (x)
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| 79 | #define NTOHL(x) (x)
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| 80 | #endif /* BIG_ENDIAN */
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| 81 |
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| 82 | #endif /* _NET__HTON_H */
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