?RCS: $Id: charsize.U,v 3.0.1.1 1994/10/29 16:07:13 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: charsize.U,v $
?RCS: Revision 3.0.1.1  1994/10/29  16:07:13  ram
?RCS: patch36: added ?F: line for metalint file checking
?RCS:
?RCS: Revision 3.0  1993/08/18  12:05:34  ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?MAKE:charsize charbits: cat rm_try Myread Compile run
?MAKE:	-pick add $@ %<
?S:charsize:
?S:	This variable contains the value of the CHARSIZE symbol, which
?S:	indicates to the C program how many bytes there are in a character.
?S:.
?S:charbits:
?S:	This variable contains the value of the CHARBITS symbol, which
?S:	indicates to the C program how many bits there are in a character.
?S:.
?C:CHARSIZE:
?C:	This symbol contains the size of a char, so that the C preprocessor
?C:	can make decisions based on it.
?C:.
?C:CHARBITS:
?C:	This symbol contains the size of a char, so that the C preprocessor
?C:	can make decisions based on it.
?C:.
?H:#define CHARSIZE $charsize		/**/
?H:#define CHARBITS $charbits		/**/
?H:.
?F:!try
: length of character in bytes. Is always 1, otherwise it is not C
: This used to be a test using sizeof
charsize=1

: Check for the number of bits in a character
case "$charbits" in
'')	echo "Checking how long a character is (in bits)..." >&4
	$cat >try.c <<EOCP
#include <stdio.h>
int main ()
{
    int n;
    unsigned char c;
    for (c = 1, n = 0; c; c <<= 1, n++) ;
    printf ("%d\n", n);
    return (0);
    }
EOCP
	set try
	if eval $compile_ok; then
		dflt=`$run ./try`
	else
		dflt='8'
		echo "(I can't seem to compile the test program.  Guessing...)"
	fi
	;;
*)
	dflt="$charbits"
	;;
esac
rp="What is the length of a character (in bits)?"
. ./myread
charbits="$ans"
$rm_try
case "$charbits" in
8)	;;
*)	cat >&4 << EOM
Your system has an unsigned character size of $charbits bits, which
is rather unusual (normally it is 8 bits).  Perl likely will not work
correctly on your system, with subtle bugs in various places.
EOM
	rp='Do you really want to continue?'
	dflt='n'
	. ./myread
	case "$ans" in
		[yY])	echo >&4 "Okay, continuing."	;;
		*)	exit 1				;;
	esac
esac

