Byte order identification

Macros
#define	U_BYTE_SWAP   0
	byte swapping into metafile is not required
#define	U_IS_BE   0
	this machine is not big endian
#define	U_IS_LE   1
	this machine is little endian
#define	U_XE   0
	do not rearrange endian for target
#define	U_LE   1
	target is Little Endian
#define	U_BE   2
	target is Big Endian
#define	U_RP   4
	replicate first instance
#define	U_XX   0xFF
	may be used to terminate a list of these target entries

Detailed Description

There is no way for the preprocessor, in general, to figure out endianness. So the command line must define WORDS_BIGENDIAN for a big endian machine. Otherwise we assume is is little endian. If it is something else this code won't work in any case.