93 lines
2.0 KiB
C
93 lines
2.0 KiB
C
/* asm/byteorder.h
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Copyright 1996, 1998, 2000, 2001, 2006, 2009, 2011 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#ifndef _I386_BYTEORDER_H
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#define _I386_BYTEORDER_H
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#include <_ansi.h>
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#include <stdint.h>
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#include <bits/endian.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef __LITTLE_ENDIAN_BITFIELD
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#define __LITTLE_ENDIAN_BITFIELD
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#endif
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extern uint32_t ntohl(uint32_t);
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extern uint16_t ntohs(uint16_t);
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extern uint32_t htonl(uint32_t);
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extern uint16_t htons(uint16_t);
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_ELIDABLE_INLINE uint32_t __ntohl(uint32_t);
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_ELIDABLE_INLINE uint16_t __ntohs(uint16_t);
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_ELIDABLE_INLINE uint32_t
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__ntohl(uint32_t x)
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{
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__asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */
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"rorl $16,%0\n\t" /* swap words */
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"xchgb %b0,%h0" /* swap higher bytes */
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:"=q" (x)
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: "0" (x));
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return x;
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}
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#define __constant_ntohl(x) \
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((uint32_t)((((uint32_t)(x) & 0x000000ffU) << 24) | \
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(((uint32_t)(x) & 0x0000ff00U) << 8) | \
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(((uint32_t)(x) & 0x00ff0000U) >> 8) | \
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(((uint32_t)(x) & 0xff000000U) >> 24)))
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_ELIDABLE_INLINE uint16_t
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__ntohs(uint16_t x)
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{
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__asm__("xchgb %b0,%h0" /* swap bytes */
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: "=q" (x)
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: "0" (x));
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return x;
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}
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#define __constant_ntohs(x) \
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((uint16_t)((((uint16_t)(x) & 0x00ff) << 8) | \
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(((uint16_t)(x) & 0xff00) >> 8))) \
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#define __htonl(x) __ntohl(x)
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#define __htons(x) __ntohs(x)
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#define __constant_htonl(x) __constant_ntohl(x)
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#define __constant_htons(x) __constant_ntohs(x)
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#if defined (__OPTIMIZE__) && !defined (__NO_INLINE__)
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# define ntohl(x) \
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(__builtin_constant_p((long)(x)) ? \
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__constant_ntohl((x)) : \
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__ntohl((x)))
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# define ntohs(x) \
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(__builtin_constant_p((short)(x)) ? \
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__constant_ntohs((x)) : \
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__ntohs((x)))
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# define htonl(x) \
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(__builtin_constant_p((long)(x)) ? \
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__constant_htonl((x)) : \
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__htonl((x)))
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# define htons(x) \
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(__builtin_constant_p((short)(x)) ? \
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__constant_htons((x)) : \
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__htons((x)))
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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