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[metaconfig.git] / U / compline / d_sanemcmp.U

?RCS: $Id: d_sanemcmp.U,v 3.0.1.1 1997/02/28 15:41:19 ram Exp $
?RCS:
?RCS: Copyright (c) 1991-1993, 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 3.0.
?RCS:
?RCS: $Log: d_sanemcmp.U,v $
?RCS: Revision 3.0.1.1  1997/02/28  15:41:19  ram
?RCS: patch61: created
?RCS:
?RCS:
?MAKE:d_sanemcmp: Compile cat d_memcmp rm_try run \
	i_memory i_stdlib i_string i_unistd Oldconfig Setvar
?MAKE:	-pick add $@ %<
?S:d_sanemcmp:
?S:	This variable conditionally defines the HAS_SANE_MEMCMP symbol if
?S:	the memcpy() routine is available and can be used to compare relative
?S:	magnitudes of chars with their high bits set.
?S:.
?C:HAS_SANE_MEMCMP:
?C:	This symbol, if defined, indicates that the memcmp routine is available
?C:	and can be used to compare relative magnitudes of chars with their high
?C:	bits set.  If it is not defined, roll your own version.
?C:.
?H:#$d_sanemcmp HAS_SANE_MEMCMP	/**/
?H:.
?F:!try
?LINT: set d_sanemcmp
: can memcmp be trusted to compare relative magnitude?
?X: assume the worst
val="$undef"
case "$d_memcmp" in
"$define")
	echo " "
	echo "Checking if your memcmp() can compare relative magnitude..." >&4
	$cat >try.c <<EOCP
#$i_memory I_MEMORY
#$i_stdlib I_STDLIB
#$i_string I_STRING
#$i_unistd I_UNISTD
EOCP
	$cat >>try.c <<'EOCP'
#include <stdio.h>
#ifdef I_MEMORY
#  include <memory.h>
#endif
#ifdef I_STDLIB
#  include <stdlib.h>
#endif
#ifdef I_STRING
#  include <string.h>
#else
#  include <strings.h>
#endif
#ifdef I_UNISTD
#  include <unistd.h>  /* Needed for NetBSD */
#endif
int main()
{
char a = -1;
char b = 0;
if ((a < b) && memcmp(&a, &b, 1) < 0)
	exit(1);
exit(0);
}
EOCP
	set try
	if eval $compile_ok; then
		if $run ./try 2>/dev/null; then
			echo "Yes, it can."
			val="$define"
		else
			echo "No, it can't (it uses signed chars)."
		fi
	else
		echo "(I can't compile the test program, so we'll assume not...)"
	fi
	;;
esac
$rm_try
set d_sanemcmp
eval $setvar