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?RCS:
?RCS: Copyright (c) 1991-1997, 2004-2006, 2012 Raphael Manfredi
?RCS:
?RCS: You may redistribute only under the terms of the Artistic License,
?RCS: as specified in the README file that comes with the distribution.
?RCS: You may reuse parts of this distribution only within the terms of
?RCS: that same Artistic License; a copy of which may be found at the root
?RCS: of the source tree for dist 4.0.
?RCS:
?MAKE:byteorder: cat contains echo n c Myread Oldconfig Loc +cc +ccflags rm _o
?MAKE: -pick add $@ %<
?S:byteorder:
?S: This variable holds the byte order. In the following, larger digits
?S: indicate more significance. The variable byteorder is either 4321
?S: on a big-endian machine, or 1234 on a little-endian one.
?S: cannot figure it out.
?S:.
?C:BYTEORDER:
?C: This symbol holds the hexadecimal constant defined in byteorder,
?C: i.e. 1234 for little-endian or 4321 for big-ending.
?C:.
?H:#define BYTEORDER 0x$byteorder /* large digits for MSB */
?H:.
?T:order
: check for ordering of bytes in a word
?X:
?X: An idea from Guido Draheim <Guido.Draheim@gmx.de> checking the endianness
?X: without actually executing code, which allows cross-compiling.
?X:
echo " "
$echo $n "Checking integer byte-ordering...$c" >&4
$cat >try.c <<'EOCP'
short ascii_be[] = { 0x4249, 0x4765, 0x6E44, 0x6961, 0x6E53, 0x7953, 0 };
short ascii_le[] = { 0x694C, 0x5454, 0x656C, 0x6E45, 0x6944, 0x6E61, 0 };
short ebcdic_be[] = { 0xC2C9, 0xC785, 0x95C4, 0x8981, 0x95E2, 0xA8E2, 0 };
short ebcdic_le[] = { 0x89D3, 0xE3E3, 0x8593, 0x95C5, 0x89C4, 0x9581, 0 };
EOCP
order=''
if $cc -c $ccflags try.c >/dev/null 2>&1; then
if $contains BIGenDianSyS try$_o >/dev/null 2>&1; then
order=4321
elif $contains LiTTleEnDian try$_o >/dev/null 2>&1; then
order=1234
else
$echo $n " wild guessing$c" >&4
order=4321
fi
fi
case "$order" in
'')
echo " cannot compute it." >&4
rp="Are integers stored in big-endian format?"
case "$byteorder" in
1234) dflt=n;;
*) dflt=y;;
esac
. ./myread
case "$ans" in
y*) order=4321;;
*) order=1234;;
esac
;;
1234) echo " little-endian." >&4;;
4321) echo " big-endian." >&4;;
esac
byteorder=$order
$rm -f try.c try$_o
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