m4/byteorder.m4 - platform/external/libmtp - Git at Google

 dnl AC_NEED_BYTEORDER_H ( HEADER-TO-GENERATE )
 dnl Copyright 2001-2002 by Dan Fandrich <dan@coneharvesters.com>
 dnl This file may be copied and used freely without restrictions.  No warranty
 dnl is expressed or implied.
 dnl
 dnl Create a header file that guarantees that byte swapping macros of the
 dnl ntohl variety as well as the extended types included in OpenBSD and
 dnl NetBSD such as le32toh are defined.  If possible, the standard ntohl
 dnl are overloaded as they are optimized for the given platform, but when
 dnl this is not possible (e.g. on a big-endian machine) they are defined
 dnl in this file.

 dnl Look for a symbol in a header file
 dnl AC_HAVE_SYMBOL ( IDENTIFIER, HEADER-FILE, ACTION-IF-FOUND, ACTION-IF-NOT-FOUND )
 AC_DEFUN([AC_HAVE_SYMBOL],
 [
 AC_MSG_CHECKING(for $1 in $2)
 AC_EGREP_CPP([symbol is present|\<$1\>],[
 #include <$2>
 #ifdef $1
  	symbol is present
 #endif
 	],
 [AC_MSG_RESULT(yes)
 $3
 ],
 [AC_MSG_RESULT(no)
 $4
 ])])


 dnl Create a header file that defines extended byte swapping macros
 AC_DEFUN([AC_NEED_BYTEORDER_H],
 [
 ac_dir=`AS_DIRNAME(["$1"])`
 if test "$ac_dir" != "$1" && test "$ac_dir" != .; then
   # The file is in a subdirectory.
   test ! -d "$ac_dir" && AS_MKDIR_P(["$ac_dir"])
 fi

 # We're only interested in the target CPU, but it's not always set
 effective_target="$target"
 if test "x$effective_target" = xNONE -o "x$effective_target" = x ; then
 	effective_target="$host"
 fi
 AC_SUBST(effective_target)

 cat > "$1" << EOF
 /* This file is generated automatically by configure */
 /* It is valid only for the system type ${effective_target} */

 #ifndef __BYTEORDER_H
 #define __BYTEORDER_H

 EOF

 dnl First, do an endian check
 AC_C_BIGENDIAN

 dnl Look for NetBSD-style extended byte swapping macros
 AC_HAVE_SYMBOL(le32toh,machine/endian.h,
  [HAVE_LE32TOH=1
  cat >> "$1" << EOF
 /* extended byte swapping macros are already available */
 #include <machine/endian.h>

 EOF],

 [

 dnl Look for standard byte swapping macros
 AC_HAVE_SYMBOL(ntohl,arpa/inet.h,
  [cat >> "$1" << EOF
 /* ntohl and relatives live here */
 #include <arpa/inet.h>

 EOF],

  [AC_HAVE_SYMBOL(ntohl,netinet/in.h,
   [cat >> "$1" << EOF
 /* ntohl and relatives live here */
 #include <netinet/in.h>

 EOF],true)])
 ])

 dnl Look for generic byte swapping macros

 dnl OpenBSD
 AC_HAVE_SYMBOL(swap32,machine/endian.h,
  [cat >> "$1" << EOF
 /* swap32 and swap16 are defined in machine/endian.h */

 EOF],

  [
 dnl Linux GLIBC
   AC_HAVE_SYMBOL(bswap_32,byteswap.h,
    [cat >> "$1" << EOF
 /* Define generic byte swapping functions */
 #include <byteswap.h>
 #define swap16(x) bswap_16(x)
 #define swap32(x) bswap_32(x)
 #define swap64(x) bswap_64(x)

 EOF],

    [
 dnl NetBSD
   	AC_HAVE_SYMBOL(bswap32,machine/endian.h,
     dnl We're already including machine/endian.h if this test succeeds
   	 [cat >> "$1" << EOF
 /* Define generic byte swapping functions */
 EOF
 	if test "$HAVE_LE32TOH" != "1"; then
 		echo '#include <machine/endian.h>'>> "$1"
 	fi
 cat >> "$1" << EOF
 #define swap16(x) bswap16(x)
 #define swap32(x) bswap32(x)
 #define swap64(x) bswap64(x)

 EOF],

    [
 dnl FreeBSD
   	AC_HAVE_SYMBOL(__byte_swap_long,sys/types.h,
   	 [cat >> "$1" << EOF
 /* Define generic byte swapping functions */
 #include <sys/types.h>
 #define swap16(x) __byte_swap_word(x)
 #define swap32(x) __byte_swap_long(x)
 /* No optimized 64 bit byte swapping macro is available */
 #define swap64(x) ((uint64_t)(((uint64_t)(x) << 56) & 0xff00000000000000ULL | \\
 			      ((uint64_t)(x) << 40) & 0x00ff000000000000ULL | \\
 			      ((uint64_t)(x) << 24) & 0x0000ff0000000000ULL | \\
 			      ((uint64_t)(x) << 8)  & 0x000000ff00000000ULL | \\
 			      ((x) >> 8)  & 0x00000000ff000000ULL | \\
 			      ((x) >> 24) & 0x0000000000ff0000ULL | \\
 			      ((x) >> 40) & 0x000000000000ff00ULL | \\
 			      ((x) >> 56) & 0x00000000000000ffULL))

 EOF],

   	 [
 dnl OS X
   	AC_HAVE_SYMBOL(NXSwapLong,machine/byte_order.h,
   	 [cat >> "$1" << EOF
 /* Define generic byte swapping functions */
 #include <machine/byte_order.h>
 #define swap16(x) NXSwapShort(x)
 #define swap32(x) NXSwapLong(x)
 #define swap64(x) NXSwapLongLong(x)

 EOF],
          [
 	if test $ac_cv_c_bigendian = yes; then
 		cat >> "$1" << EOF
 /* No other byte swapping functions are available on this big-endian system */
 #define swap16(x)	((uint16_t)(((x) << 8) | ((uint16_t)(x) >> 8)))
 #define swap32(x)	((uint32_t)(((uint32_t)(x) << 24) & 0xff000000UL | \\
 				    ((uint32_t)(x) << 8)  & 0x00ff0000UL | \\
 				    ((x) >> 8)  & 0x0000ff00UL | \\
 				    ((x) >> 24) & 0x000000ffUL))
 #define swap64(x) ((uint64_t)(((uint64_t)(x) << 56) & 0xff00000000000000ULL | \\
 			      ((uint64_t)(x) << 40) & 0x00ff000000000000ULL | \\
 			      ((uint64_t)(x) << 24) & 0x0000ff0000000000ULL | \\
 			      ((uint64_t)(x) << 8)  & 0x000000ff00000000ULL | \\
 			      ((x) >> 8)  & 0x00000000ff000000ULL | \\
 			      ((x) >> 24) & 0x0000000000ff0000ULL | \\
 			      ((x) >> 40) & 0x000000000000ff00ULL | \\
 			      ((x) >> 56) & 0x00000000000000ffULL))

 EOF
 	else
  cat >> "$1" << EOF
 /* Use these as generic byteswapping macros on this little endian system */
 #define swap16(x)		ntohs(x)
 #define swap32(x)		ntohl(x)
 /* No optimized 64 bit byte swapping macro is available */
 #define swap64(x) ((uint64_t)(((uint64_t)(x) << 56) & 0xff00000000000000ULL | \\
 			      ((uint64_t)(x) << 40) & 0x00ff000000000000ULL | \\
 			      ((uint64_t)(x) << 24) & 0x0000ff0000000000ULL | \\
 			      ((uint64_t)(x) << 8)  & 0x000000ff00000000ULL | \\
 			      ((x) >> 8)  & 0x00000000ff000000ULL | \\
 			      ((x) >> 24) & 0x0000000000ff0000ULL | \\
 			      ((x) >> 40) & 0x000000000000ff00ULL | \\
 			      ((x) >> 56) & 0x00000000000000ffULL))

 EOF
 	fi
 ])
   	  ])
     ])
   ])
 ])


 [
 if test "$HAVE_LE32TOH" != "1"; then
  cat >> "$1" << EOF
 /* The byte swapping macros have the form: */
 /*   EENN[a]toh or htoEENN[a] where EE is be (big endian) or */
 /* le (little-endian), NN is 16 or 32 (number of bits) and a, */
 /* if present, indicates that the endian side is a pointer to an */
 /* array of uint8_t bytes instead of an integer of the specified length. */
 /* h refers to the host's ordering method. */

 /* So, to convert a 32-bit integer stored in a buffer in little-endian */
 /* format into a uint32_t usable on this machine, you could use: */
 /*   uint32_t value = le32atoh(&buf[3]); */
 /* To put that value back into the buffer, you could use: */
 /*   htole32a(&buf[3], value); */

 /* Define aliases for the standard byte swapping macros */
 /* Arguments to these macros must be properly aligned on natural word */
 /* boundaries in order to work properly on all architectures */
 #ifndef htobe16
 # define htobe16(x) htons(x)
 #endif
 #ifndef htobe32
 # define htobe32(x) htonl(x)
 #endif
 #ifndef be16toh
 # define be16toh(x) ntohs(x)
 #endif
 #ifndef be32toh
 # define be32toh(x) ntohl(x)
 #endif

 #define HTOBE16(x) (x) = htobe16(x)
 #define HTOBE32(x) (x) = htobe32(x)
 #define BE32TOH(x) (x) = be32toh(x)
 #define BE16TOH(x) (x) = be16toh(x)

 EOF

  if test $ac_cv_c_bigendian = yes; then
   cat >> "$1" << EOF
 /* Define our own extended byte swapping macros for big-endian machines */
 #ifndef htole16
 # define htole16(x)      swap16(x)
 #endif
 #ifndef htole32
 # define htole32(x)      swap32(x)
 #endif
 #ifndef le16toh
 # define le16toh(x)      swap16(x)
 #endif
 #ifndef le32toh
 # define le32toh(x)      swap32(x)
 #endif
 #ifndef le64toh
 # define le64toh(x)      swap64(x)
 #endif

 #ifndef htobe64
 # define htobe64(x)      (x)
 #endif
 #ifndef be64toh
 # define be64toh(x)      (x)
 #endif

 #define HTOLE16(x)      (x) = htole16(x)
 #define HTOLE32(x)      (x) = htole32(x)
 #define LE16TOH(x)      (x) = le16toh(x)
 #define LE32TOH(x)      (x) = le32toh(x)
 #define LE64TOH(x)      (x) = le64toh(x)

 #define HTOBE64(x)      (void) (x)
 #define BE64TOH(x)      (void) (x)

 EOF
  else
   cat >> "$1" << EOF
 /* On little endian machines, these macros are null */
 #ifndef htole16
 # define htole16(x)      (x)
 #endif
 #ifndef htole32
 # define htole32(x)      (x)
 #endif
 #ifndef htole64
 # define htole64(x)      (x)
 #endif
 #ifndef le16toh
 # define le16toh(x)      (x)
 #endif
 #ifndef le32toh
 # define le32toh(x)      (x)
 #endif
 #ifndef le64toh
 # define le64toh(x)      (x)
 #endif

 #define HTOLE16(x)      (void) (x)
 #define HTOLE32(x)      (void) (x)
 #define HTOLE64(x)      (void) (x)
 #define LE16TOH(x)      (void) (x)
 #define LE32TOH(x)      (void) (x)
 #define LE64TOH(x)      (void) (x)

 /* These don't have standard aliases */
 #ifndef htobe64
 # define htobe64(x)      swap64(x)
 #endif
 #ifndef be64toh
 # define be64toh(x)      swap64(x)
 #endif

 #define HTOBE64(x)      (x) = htobe64(x)
 #define BE64TOH(x)      (x) = be64toh(x)

 EOF
  fi
 fi

 cat >> "$1" << EOF
 /* Define the C99 standard length-specific integer types */
 #include <_stdint.h>

 EOF

 case "${effective_target}" in
  i[3456]86-*)
   cat >> "$1" << EOF
 /* Here are some macros to create integers from a byte array */
 /* These are used to get and put integers from/into a uint8_t array */
 /* with a specific endianness.  This is the most portable way to generate */
 /* and read messages to a network or serial device.  Each member of a */
 /* packet structure must be handled separately. */

 /* The i386 and compatibles can handle unaligned memory access, */
 /* so use the optimized macros above to do this job */
 #ifndef be16atoh
 # define be16atoh(x)     be16toh(*(uint16_t*)(x))
 #endif
 #ifndef be32atoh
 # define be32atoh(x)     be32toh(*(uint32_t*)(x))
 #endif
 #ifndef be64atoh
 # define be64atoh(x)     be64toh(*(uint64_t*)(x))
 #endif
 #ifndef le16atoh
 # define le16atoh(x)     le16toh(*(uint16_t*)(x))
 #endif
 #ifndef le32atoh
 # define le32atoh(x)     le32toh(*(uint32_t*)(x))
 #endif
 #ifndef le64atoh
 # define le64atoh(x)     le64toh(*(uint64_t*)(x))
 #endif

 #ifndef htob16a
 # define htobe16a(a,x)   *(uint16_t*)(a) = htobe16(x)
 #endif
 #ifndef htobe32a
 # define htobe32a(a,x)   *(uint32_t*)(a) = htobe32(x)
 #endif
 #ifndef htobe64a
 # define htobe64a(a,x)   *(uint64_t*)(a) = htobe64(x)
 #endif
 #ifndef htole16a
 # define htole16a(a,x)   *(uint16_t*)(a) = htole16(x)
 #endif
 #ifndef htole32a
 # define htole32a(a,x)   *(uint32_t*)(a) = htole32(x)
 #endif
 #ifndef htole64a
 # define htole64a(a,x)   *(uint64_t*)(a) = htole64(x)
 #endif

 EOF
   ;;

  *)
   cat >> "$1" << EOF
 /* Here are some macros to create integers from a byte array */
 /* These are used to get and put integers from/into a uint8_t array */
 /* with a specific endianness.  This is the most portable way to generate */
 /* and read messages to a network or serial device.  Each member of a */
 /* packet structure must be handled separately. */

 /* Non-optimized but portable macros */
 #define be16atoh(x)     ((uint16_t)(((x)[0]<<8)|(x)[1]))
 #define be32atoh(x)     ((uint32_t)(((x)[0]<<24)|((x)[1]<<16)|((x)[2]<<8)|(x)[3]))
 #define be64atoh_x(x,off,shift) 	(((uint64_t)((x)[off]))<<shift)
 #define be64atoh(x)     ((uint64_t)(be64atoh_x(x,0,56)|be64atoh_x(x,1,48)|be64atoh_x(x,2,40)| \\
         be64atoh_x(x,3,32)|be64atoh_x(x,4,24)|be64atoh_x(x,5,16)|be64atoh_x(x,6,8)|((x)[7])))
 #define le16atoh(x)     ((uint16_t)(((x)[1]<<8)|(x)[0]))
 #define le32atoh(x)     ((uint32_t)(((x)[3]<<24)|((x)[2]<<16)|((x)[1]<<8)|(x)[0]))
 #define le64atoh_x(x,off,shift) (((uint64_t)(x)[off])<<shift)
 #define le64atoh(x)     ((uint64_t)(le64atoh_x(x,7,56)|le64atoh_x(x,6,48)|le64atoh_x(x,5,40)| \\
         le64atoh_x(x,4,32)|le64atoh_x(x,3,24)|le64atoh_x(x,2,16)|le64atoh_x(x,1,8)|((x)[0])))

 #define htobe16a(a,x)   (a)[0]=(uint8_t)((x)>>8), (a)[1]=(uint8_t)(x)
 #define htobe32a(a,x)   (a)[0]=(uint8_t)((x)>>24), (a)[1]=(uint8_t)((x)>>16), \\
         (a)[2]=(uint8_t)((x)>>8), (a)[3]=(uint8_t)(x)
 #define htobe64a(a,x)   (a)[0]=(uint8_t)((x)>>56), (a)[1]=(uint8_t)((x)>>48), \\
         (a)[2]=(uint8_t)((x)>>40), (a)[3]=(uint8_t)((x)>>32), \\
         (a)[4]=(uint8_t)((x)>>24), (a)[5]=(uint8_t)((x)>>16), \\
         (a)[6]=(uint8_t)((x)>>8), (a)[7]=(uint8_t)(x)
 #define htole16a(a,x)   (a)[1]=(uint8_t)((x)>>8), (a)[0]=(uint8_t)(x)
 #define htole32a(a,x)   (a)[3]=(uint8_t)((x)>>24), (a)[2]=(uint8_t)((x)>>16), \\
         (a)[1]=(uint8_t)((x)>>8), (a)[0]=(uint8_t)(x)
 #define htole64a(a,x)   (a)[7]=(uint8_t)((x)>>56), (a)[6]=(uint8_t)((x)>>48), \\
         (a)[5]=(uint8_t)((x)>>40), (a)[4]=(uint8_t)((x)>>32), \\
         (a)[3]=(uint8_t)((x)>>24), (a)[2]=(uint8_t)((x)>>16), \\
         (a)[1]=(uint8_t)((x)>>8), (a)[0]=(uint8_t)(x)

 EOF
   ;;
 esac
 ]

 cat >> "$1" << EOF
 #endif /*__BYTEORDER_H*/
 EOF])
	dnl AC_NEED_BYTEORDER_H ( HEADER-TO-GENERATE )
	dnl Copyright 2001-2002 by Dan Fandrich <dan@coneharvesters.com>
	dnl This file may be copied and used freely without restrictions. No warranty
	dnl is expressed or implied.
	dnl
	dnl Create a header file that guarantees that byte swapping macros of the
	dnl ntohl variety as well as the extended types included in OpenBSD and
	dnl NetBSD such as le32toh are defined. If possible, the standard ntohl
	dnl are overloaded as they are optimized for the given platform, but when
	dnl this is not possible (e.g. on a big-endian machine) they are defined
	dnl in this file.

	dnl Look for a symbol in a header file
	dnl AC_HAVE_SYMBOL ( IDENTIFIER, HEADER-FILE, ACTION-IF-FOUND, ACTION-IF-NOT-FOUND )
	AC_DEFUN([AC_HAVE_SYMBOL],
	[
	AC_MSG_CHECKING(for $1 in $2)
	AC_EGREP_CPP([symbol is present\|\<$1\>],[
	#include <$2>
	#ifdef $1
	symbol is present
	#endif
	],
	[AC_MSG_RESULT(yes)
	$3
	],
	[AC_MSG_RESULT(no)
	$4
	])])


	dnl Create a header file that defines extended byte swapping macros
	AC_DEFUN([AC_NEED_BYTEORDER_H],
	[
	ac_dir=`AS_DIRNAME(["$1"])`
	if test "$ac_dir" != "$1" && test "$ac_dir" != .; then
	# The file is in a subdirectory.
	test ! -d "$ac_dir" && AS_MKDIR_P(["$ac_dir"])
	fi

	# We're only interested in the target CPU, but it's not always set
	effective_target="$target"
	if test "x$effective_target" = xNONE -o "x$effective_target" = x ; then
	effective_target="$host"
	fi
	AC_SUBST(effective_target)

	cat > "$1" << EOF
	/* This file is generated automatically by configure */
	/* It is valid only for the system type ${effective_target} */

	#ifndef __BYTEORDER_H
	#define __BYTEORDER_H

	EOF

	dnl First, do an endian check
	AC_C_BIGENDIAN

	dnl Look for NetBSD-style extended byte swapping macros
	AC_HAVE_SYMBOL(le32toh,machine/endian.h,
	[HAVE_LE32TOH=1
	cat >> "$1" << EOF
	/* extended byte swapping macros are already available */
	#include <machine/endian.h>

	EOF],

	[

	dnl Look for standard byte swapping macros
	AC_HAVE_SYMBOL(ntohl,arpa/inet.h,
	[cat >> "$1" << EOF
	/* ntohl and relatives live here */
	#include <arpa/inet.h>

	EOF],

	[AC_HAVE_SYMBOL(ntohl,netinet/in.h,
	[cat >> "$1" << EOF
	/* ntohl and relatives live here */
	#include <netinet/in.h>

	EOF],true)])
	])

	dnl Look for generic byte swapping macros

	dnl OpenBSD
	AC_HAVE_SYMBOL(swap32,machine/endian.h,
	[cat >> "$1" << EOF
	/* swap32 and swap16 are defined in machine/endian.h */

	EOF],

	[
	dnl Linux GLIBC
	AC_HAVE_SYMBOL(bswap_32,byteswap.h,
	[cat >> "$1" << EOF
	/* Define generic byte swapping functions */
	#include <byteswap.h>
	#define swap16(x) bswap_16(x)
	#define swap32(x) bswap_32(x)
	#define swap64(x) bswap_64(x)

	EOF],

	[
	dnl NetBSD
	AC_HAVE_SYMBOL(bswap32,machine/endian.h,
	dnl We're already including machine/endian.h if this test succeeds
	[cat >> "$1" << EOF
	/* Define generic byte swapping functions */
	EOF
	if test "$HAVE_LE32TOH" != "1"; then
	echo '#include <machine/endian.h>'>> "$1"
	fi
	cat >> "$1" << EOF
	#define swap16(x) bswap16(x)
	#define swap32(x) bswap32(x)
	#define swap64(x) bswap64(x)

	EOF],

	[
	dnl FreeBSD
	AC_HAVE_SYMBOL(__byte_swap_long,sys/types.h,
	[cat >> "$1" << EOF
	/* Define generic byte swapping functions */
	#include <sys/types.h>
	#define swap16(x) __byte_swap_word(x)
	#define swap32(x) __byte_swap_long(x)
	/* No optimized 64 bit byte swapping macro is available */
	#define swap64(x) ((uint64_t)(((uint64_t)(x) << 56) & 0xff00000000000000ULL \| \\
	((uint64_t)(x) << 40) & 0x00ff000000000000ULL \| \\
	((uint64_t)(x) << 24) & 0x0000ff0000000000ULL \| \\
	((uint64_t)(x) << 8) & 0x000000ff00000000ULL \| \\
	((x) >> 8) & 0x00000000ff000000ULL \| \\
	((x) >> 24) & 0x0000000000ff0000ULL \| \\
	((x) >> 40) & 0x000000000000ff00ULL \| \\
	((x) >> 56) & 0x00000000000000ffULL))

	EOF],

	[
	dnl OS X
	AC_HAVE_SYMBOL(NXSwapLong,machine/byte_order.h,
	[cat >> "$1" << EOF
	/* Define generic byte swapping functions */
	#include <machine/byte_order.h>
	#define swap16(x) NXSwapShort(x)
	#define swap32(x) NXSwapLong(x)
	#define swap64(x) NXSwapLongLong(x)

	EOF],
	[
	if test $ac_cv_c_bigendian = yes; then
	cat >> "$1" << EOF
	/* No other byte swapping functions are available on this big-endian system */
	#define swap16(x) ((uint16_t)(((x) << 8) \| ((uint16_t)(x) >> 8)))
	#define swap32(x) ((uint32_t)(((uint32_t)(x) << 24) & 0xff000000UL \| \\
	((uint32_t)(x) << 8) & 0x00ff0000UL \| \\
	((x) >> 8) & 0x0000ff00UL \| \\
	((x) >> 24) & 0x000000ffUL))
	#define swap64(x) ((uint64_t)(((uint64_t)(x) << 56) & 0xff00000000000000ULL \| \\
	((uint64_t)(x) << 40) & 0x00ff000000000000ULL \| \\
	((uint64_t)(x) << 24) & 0x0000ff0000000000ULL \| \\
	((uint64_t)(x) << 8) & 0x000000ff00000000ULL \| \\
	((x) >> 8) & 0x00000000ff000000ULL \| \\
	((x) >> 24) & 0x0000000000ff0000ULL \| \\
	((x) >> 40) & 0x000000000000ff00ULL \| \\
	((x) >> 56) & 0x00000000000000ffULL))

	EOF
	else
	cat >> "$1" << EOF
	/* Use these as generic byteswapping macros on this little endian system */
	#define swap16(x) ntohs(x)
	#define swap32(x) ntohl(x)
	/* No optimized 64 bit byte swapping macro is available */
	#define swap64(x) ((uint64_t)(((uint64_t)(x) << 56) & 0xff00000000000000ULL \| \\
	((uint64_t)(x) << 40) & 0x00ff000000000000ULL \| \\
	((uint64_t)(x) << 24) & 0x0000ff0000000000ULL \| \\
	((uint64_t)(x) << 8) & 0x000000ff00000000ULL \| \\
	((x) >> 8) & 0x00000000ff000000ULL \| \\
	((x) >> 24) & 0x0000000000ff0000ULL \| \\
	((x) >> 40) & 0x000000000000ff00ULL \| \\
	((x) >> 56) & 0x00000000000000ffULL))

	EOF
	fi
	])
	])
	])
	])
	])


	[
	if test "$HAVE_LE32TOH" != "1"; then
	cat >> "$1" << EOF
	/* The byte swapping macros have the form: */
	/* EENN[a]toh or htoEENN[a] where EE is be (big endian) or */
	/* le (little-endian), NN is 16 or 32 (number of bits) and a, */
	/* if present, indicates that the endian side is a pointer to an */
	/* array of uint8_t bytes instead of an integer of the specified length. */
	/* h refers to the host's ordering method. */

	/* So, to convert a 32-bit integer stored in a buffer in little-endian */
	/* format into a uint32_t usable on this machine, you could use: */
	/* uint32_t value = le32atoh(&buf[3]); */
	/* To put that value back into the buffer, you could use: */
	/* htole32a(&buf[3], value); */

	/* Define aliases for the standard byte swapping macros */
	/* Arguments to these macros must be properly aligned on natural word */
	/* boundaries in order to work properly on all architectures */
	#ifndef htobe16
	# define htobe16(x) htons(x)
	#endif
	#ifndef htobe32
	# define htobe32(x) htonl(x)
	#endif
	#ifndef be16toh
	# define be16toh(x) ntohs(x)
	#endif
	#ifndef be32toh
	# define be32toh(x) ntohl(x)
	#endif

	#define HTOBE16(x) (x) = htobe16(x)
	#define HTOBE32(x) (x) = htobe32(x)
	#define BE32TOH(x) (x) = be32toh(x)
	#define BE16TOH(x) (x) = be16toh(x)

	EOF

	if test $ac_cv_c_bigendian = yes; then
	cat >> "$1" << EOF
	/* Define our own extended byte swapping macros for big-endian machines */
	#ifndef htole16
	# define htole16(x) swap16(x)
	#endif
	#ifndef htole32
	# define htole32(x) swap32(x)
	#endif
	#ifndef le16toh
	# define le16toh(x) swap16(x)
	#endif
	#ifndef le32toh
	# define le32toh(x) swap32(x)
	#endif
	#ifndef le64toh
	# define le64toh(x) swap64(x)
	#endif

	#ifndef htobe64
	# define htobe64(x) (x)
	#endif
	#ifndef be64toh
	# define be64toh(x) (x)
	#endif

	#define HTOLE16(x) (x) = htole16(x)
	#define HTOLE32(x) (x) = htole32(x)
	#define LE16TOH(x) (x) = le16toh(x)
	#define LE32TOH(x) (x) = le32toh(x)
	#define LE64TOH(x) (x) = le64toh(x)

	#define HTOBE64(x) (void) (x)
	#define BE64TOH(x) (void) (x)

	EOF
	else
	cat >> "$1" << EOF
	/* On little endian machines, these macros are null */
	#ifndef htole16
	# define htole16(x) (x)
	#endif
	#ifndef htole32
	# define htole32(x) (x)
	#endif
	#ifndef htole64
	# define htole64(x) (x)
	#endif
	#ifndef le16toh
	# define le16toh(x) (x)
	#endif
	#ifndef le32toh
	# define le32toh(x) (x)
	#endif
	#ifndef le64toh
	# define le64toh(x) (x)
	#endif

	#define HTOLE16(x) (void) (x)
	#define HTOLE32(x) (void) (x)
	#define HTOLE64(x) (void) (x)
	#define LE16TOH(x) (void) (x)
	#define LE32TOH(x) (void) (x)
	#define LE64TOH(x) (void) (x)

	/* These don't have standard aliases */
	#ifndef htobe64
	# define htobe64(x) swap64(x)
	#endif
	#ifndef be64toh
	# define be64toh(x) swap64(x)
	#endif

	#define HTOBE64(x) (x) = htobe64(x)
	#define BE64TOH(x) (x) = be64toh(x)

	EOF
	fi
	fi

	cat >> "$1" << EOF
	/* Define the C99 standard length-specific integer types */
	#include <_stdint.h>

	EOF

	case "${effective_target}" in
	i[3456]86-*)
	cat >> "$1" << EOF
	/* Here are some macros to create integers from a byte array */
	/* These are used to get and put integers from/into a uint8_t array */
	/* with a specific endianness. This is the most portable way to generate */
	/* and read messages to a network or serial device. Each member of a */
	/* packet structure must be handled separately. */

	/* The i386 and compatibles can handle unaligned memory access, */
	/* so use the optimized macros above to do this job */
	#ifndef be16atoh
	# define be16atoh(x) be16toh((uint16_t)(x))
	#endif
	#ifndef be32atoh
	# define be32atoh(x) be32toh((uint32_t)(x))
	#endif
	#ifndef be64atoh
	# define be64atoh(x) be64toh((uint64_t)(x))
	#endif
	#ifndef le16atoh
	# define le16atoh(x) le16toh((uint16_t)(x))
	#endif
	#ifndef le32atoh
	# define le32atoh(x) le32toh((uint32_t)(x))
	#endif
	#ifndef le64atoh
	# define le64atoh(x) le64toh((uint64_t)(x))
	#endif

	#ifndef htob16a
	# define htobe16a(a,x) (uint16_t)(a) = htobe16(x)
	#endif
	#ifndef htobe32a
	# define htobe32a(a,x) (uint32_t)(a) = htobe32(x)
	#endif
	#ifndef htobe64a
	# define htobe64a(a,x) (uint64_t)(a) = htobe64(x)
	#endif
	#ifndef htole16a
	# define htole16a(a,x) (uint16_t)(a) = htole16(x)
	#endif
	#ifndef htole32a
	# define htole32a(a,x) (uint32_t)(a) = htole32(x)
	#endif
	#ifndef htole64a
	# define htole64a(a,x) (uint64_t)(a) = htole64(x)
	#endif

	EOF
	;;

	*)
	cat >> "$1" << EOF
	/* Here are some macros to create integers from a byte array */
	/* These are used to get and put integers from/into a uint8_t array */
	/* with a specific endianness. This is the most portable way to generate */
	/* and read messages to a network or serial device. Each member of a */
	/* packet structure must be handled separately. */

	/* Non-optimized but portable macros */
	#define be16atoh(x) ((uint16_t)(((x)[0]<<8)\|(x)[1]))
	#define be32atoh(x) ((uint32_t)(((x)[0]<<24)\|((x)[1]<<16)\|((x)[2]<<8)\|(x)[3]))
	#define be64atoh_x(x,off,shift) (((uint64_t)((x)[off]))<<shift)
	#define be64atoh(x) ((uint64_t)(be64atoh_x(x,0,56)\|be64atoh_x(x,1,48)\|be64atoh_x(x,2,40)\| \\
	be64atoh_x(x,3,32)\|be64atoh_x(x,4,24)\|be64atoh_x(x,5,16)\|be64atoh_x(x,6,8)\|((x)[7])))
	#define le16atoh(x) ((uint16_t)(((x)[1]<<8)\|(x)[0]))
	#define le32atoh(x) ((uint32_t)(((x)[3]<<24)\|((x)[2]<<16)\|((x)[1]<<8)\|(x)[0]))
	#define le64atoh_x(x,off,shift) (((uint64_t)(x)[off])<<shift)
	#define le64atoh(x) ((uint64_t)(le64atoh_x(x,7,56)\|le64atoh_x(x,6,48)\|le64atoh_x(x,5,40)\| \\
	le64atoh_x(x,4,32)\|le64atoh_x(x,3,24)\|le64atoh_x(x,2,16)\|le64atoh_x(x,1,8)\|((x)[0])))

	#define htobe16a(a,x) (a)[0]=(uint8_t)((x)>>8), (a)[1]=(uint8_t)(x)
	#define htobe32a(a,x) (a)[0]=(uint8_t)((x)>>24), (a)[1]=(uint8_t)((x)>>16), \\
	(a)[2]=(uint8_t)((x)>>8), (a)[3]=(uint8_t)(x)
	#define htobe64a(a,x) (a)[0]=(uint8_t)((x)>>56), (a)[1]=(uint8_t)((x)>>48), \\
	(a)[2]=(uint8_t)((x)>>40), (a)[3]=(uint8_t)((x)>>32), \\
	(a)[4]=(uint8_t)((x)>>24), (a)[5]=(uint8_t)((x)>>16), \\
	(a)[6]=(uint8_t)((x)>>8), (a)[7]=(uint8_t)(x)
	#define htole16a(a,x) (a)[1]=(uint8_t)((x)>>8), (a)[0]=(uint8_t)(x)
	#define htole32a(a,x) (a)[3]=(uint8_t)((x)>>24), (a)[2]=(uint8_t)((x)>>16), \\
	(a)[1]=(uint8_t)((x)>>8), (a)[0]=(uint8_t)(x)
	#define htole64a(a,x) (a)[7]=(uint8_t)((x)>>56), (a)[6]=(uint8_t)((x)>>48), \\
	(a)[5]=(uint8_t)((x)>>40), (a)[4]=(uint8_t)((x)>>32), \\
	(a)[3]=(uint8_t)((x)>>24), (a)[2]=(uint8_t)((x)>>16), \\
	(a)[1]=(uint8_t)((x)>>8), (a)[0]=(uint8_t)(x)

	EOF
	;;
	esac
	]

	cat >> "$1" << EOF
	#endif /__BYTEORDER_H/
	EOF])