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Full Discussion: Platform type in Unix
Top Forums Programming Platform type in Unix Post 302121146 by porter on Tuesday 12th of June 2007 04:50:58 AM
Old 06-12-2007
Sure, the issue with big/little endian is their storage in memory. So "\001\000\000\000" sets up four bytes of memory, this could also be done as

char buffer[]={1,0,0,0};

but the string approach allows it to be done inline and use octel encoding, hence the three digits per byte.

Then we try and read a short from that area of memory, now we actually don't know how big a short is, but it's unlikely to be more than four bytes, the spec only says that a short should not be longer than a long, so casting it to a (const short *) means this is a pointer to a short, then the preceeding * gets the value of at that pointer.

If this was a big-endian machine it would have loaded 0x0100 into the short, if it was little-endian it would have loaded 0x0001.

In the very rare case that a short was 4 bytes, then the big-endian machine would have loaded 0x01000000 hence the test for < 256.
 

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machid(1)							   User Commands							 machid(1)

NAME
machid, sun, iAPX286, i286, i386, i486, i860, pdp11, sparc, u3b, u3b2, u3b5, u3b15, vax, u370 - get processor type truth value SYNOPSIS
sun iAPX286 i386 pdp11 sparc u3b u3b2 u3b5 u3b15 vax u370 DESCRIPTION
The following commands will return a true value (exit code of 0) if you are using an instruction set that the command name indicates. sun True if you are on a Sun system. iAPX286 True if you are on a computer using an iAPX286 processor. i386 True if you are on a computer using an iAPX386 processor. pdp11 True if you are on a PDP-11/45tm or PDP-11/70tm. sparc True if you are on a computer using a SPARC-family processor. u3b True if you are on a 3B20 computer. u3b2 True if you are on a 3B2 computer. u3b5 True if you are on a 3B5 computer. u3b15 True if you are on a 3B15 computer. vax True if you are on a VAX-11/750tm or VAX-11/780tm. u370 True if you are on an IBM(R) System/370tm computer. The commands that do not apply will return a false (non-zero) value. These commands are often used within makefiles (see make(1S)) and shell scripts (see sh(1)) to increase portability. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
make(1S), sh(1), test(1), true(1), uname(1), attributes(5) NOTES
The machid family of commands is obsolete. Use uname -p and uname -m instead. SunOS 5.11 5 Jul 1990 machid(1)
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