+.SS "Byte order conversions"
+For each size suffix
+.IR w ,
+the macro invocation
+.BI ENDSWAP w ( x )
+returns the
+.IR w -bit
+value
+.IR x
+with its bytes reversed. The
+.B ENDSWAP8
+macro does nothing (except truncate its operand to 8 bits), but is
+provided for the sake of completeness.
+.PP
+A
+.I big-endian
+representation stores the most significant octet of an integer at the
+lowest address, with the following octets in decreasing order of
+significance. A
+.I little-endian
+representation instead stores the
+.I least
+significant octet at the lowest address, with the following octets in
+increasing order of significance. An environment has a preferred order
+for arranging the constituent octets of an integer of some given size in
+memory; this might be either the big- or little-endian representation
+just described, or something else strange.
+.PP
+It might be possible to rearrange the bits in an integer so that, when
+that integer is stored to memory in the environment's preferred manner,
+you end up with the big- or little-endian representation of the original
+integer; and, similarly, it might be possible to load a big- or
+little-endian representation of an integer into a variable using the
+environment's preferred ordering and then rearrange the bits so as to
+recover the integer value originally represented. If the environment is
+sufficiently strange, these things might not be possible, but this is
+actually quite rare.
+.PP
+Say that an integer has been converted to
+.I big-
+or
+.I "little-endian form"
+if, when it is stored in memory in the environment's preferred manner,
+one ends up with a big- or little-endian representation of the original
+integer. Equivalently, if one starts with a big- or little-endian
+representation of some integer, and loads it into a variable using the
+environment's preferred manner, one ends up with the big- or
+little-endian form of the original integer.
+.PP
+If these things are possible, then the following macros are defined.
+.TP
+.BI HTOL w ( x )
+Convert a
+.IR w -bit
+integer
+.I x
+to little-endian form.
+.TP
+.BI HTOB w ( x )
+Convert a
+.IR w -bit
+integer
+.I x
+to big-endian form.
+.TP
+.BI LTOH w ( x )
+Convert a
+.IR w -bit
+integer
+.I x
+from little-endian form.
+.TP
+.BI BTOH w ( x )
+Convert a
+.IR w -bit
+integer
+.I x
+from big-endian form.
+.