03-03-2002
I have never heard of any macros like that and I don't see them in HP's include file.
Big Endian and Little Endian are two ways to distribute the 4 bytes of a 32 bit integer. At least one other scheme is in use. If big endian is 4321 and little endian is 1234, then the other scheme is 2143. It arose when a 16 bit big endian cpu with a 16 bit adder implemented 32 bit arithmetic in two stages. It needed to add the low order words first to get the carry for the second addition stage. And these are just the three schemes that I know exist. There are 21 other ways to distribute 4 bytes of a 32 bit integer. And even that assumes that we can all stay in agreement that the bytes themselves are big endian.
The macros that I mentioned will handle all of the possibilities. If you use them you should never have to worry about or even know the structure of a word on your computer.
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LEARN ABOUT OPENSOLARIS
mlib_vectorreversebyteorder
mlib_VectorReverseByteOrder(3MLIB) mediaLib Library Functions mlib_VectorReverseByteOrder(3MLIB)
NAME
mlib_VectorReverseByteOrder - reverse byte order of vector
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_VectorReverseByteOrder(void *z, const void *x,
mlib_s32 n, mlib_s32 s);
DESCRIPTION
The mlib_VectorReverseByteOrder() function changes the encoding of each element from big endian to little endian, or from little endian to
big endian.
It copies and reverses the byte order of each element of the input vector into the output vector.
PARAMETERS
The function takes the following arguments:
z Pointer to the output vector.
x Pointer to the input vector.
n Number of elements in the vectors.
s Size of elements in bytes.
RETURN VALUES
The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Committed |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO
mlib_VectorReverseByteOrder_Inp(3MLIB), mlib_VectorReverseByteOrder_S16(3MLIB), mlib_VectorReverseByteOrder_S16_S16(3MLIB), attributes(5)
SunOS 5.11 2 Mar 2007 mlib_VectorReverseByteOrder(3MLIB)