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[metaconfig.git] / dist / U / ssizetype.U

?RCS: $Id: ssizetype.U 1 2006-08-24 12:32:52Z rmanfredi $
?RCS:
?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi
?RCS: 
?RCS: You may redistribute only under the terms of the Artistic Licence,
?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 Licence; a copy of which may be found at the root
?RCS: of the source tree for dist 4.0.
?RCS:
?RCS: Original Author: Andy Dougherty <doughera@lafcol.lafayette.edu>
?RCS:
?RCS: $Log: ssizetype.U,v $
?RCS: Revision 3.0.1.3  1997/02/28  16:24:21  ram
?RCS: patch61: integrated perl5 concerns for mis-configured sfio
?RCS:
?RCS: Revision 3.0.1.2  1994/10/29  16:30:28  ram
?RCS: patch36: added ?F: line for metalint file checking
?RCS: patch36: added 'ldflags' to the test compile line (ADO)
?RCS:
?RCS: Revision 3.0.1.1  1994/08/29  16:33:06  ram
?RCS: patch32: created by ADO
?RCS:
?MAKE:ssizetype: Myread Typedef sizetype cat rm \
	+cc +optimize +ccflags +ldflags +libs _o
?MAKE:	-pick add $@ %<
?S:ssizetype:
?S:	This variable defines ssizetype to be something like ssize_t, 
?S:	long or int.  It is used by functions that return a count 
?S:	of bytes or an error condition.  It must be a signed type.
?S:	We will pick a type such that sizeof(SSize_t) == sizeof(Size_t).
?S:.
?C:SSize_t:
?C:	This symbol holds the type used by functions that return
?C:	a count of bytes or an error condition.  It must be a signed type.
?C:	It is usually ssize_t, but may be long or int, etc.
?C:	It may be necessary to include <sys/types.h> or <unistd.h>
?C:	to get any typedef'ed information.
?C:	We will pick a type such that sizeof(SSize_t) == sizeof(Size_t).
?C:.
?H:#define SSize_t $ssizetype	 /* signed count of bytes */
?H:.
?F:!ssize.out !ssize
: see what type is used for signed size_t
set ssize_t ssizetype int stdio.h sys/types.h
eval $typedef
dflt="$ssizetype"
?X: Now check out whether sizeof(SSize_t) == sizeof(Size_t)
$cat > ssize.c <<EOM
#include <stdio.h>
#include <sys/types.h>
#define Size_t $sizetype
#define SSize_t $dflt
int main()
{
	if (sizeof(Size_t) == sizeof(SSize_t))
		printf("$dflt\n");
	else if (sizeof(Size_t) == sizeof(int))
		printf("int\n");
	else 
		printf("long\n");
	fflush(stdout);
	exit(0);
}
EOM
echo " "
?X: If $libs contains -lsfio, and sfio is mis-configured, then it
?X: sometimes (apparently) runs and exits with a 0 status, but with no
?X: output!.  Thus we check with test -s whether we actually got any
?X: output.  I think it has to do with sfio's use of _exit vs. exit,
?X: but I don't know for sure.  --Andy Dougherty  1/27/97.
if $cc $optimize $ccflags $ldflags -o ssize ssize.c $libs > /dev/null 2>&1  &&
		./ssize > ssize.out 2>/dev/null && test -s ssize.out ; then
	ssizetype=`$cat ssize.out`
	echo "I'll be using $ssizetype for functions returning a byte count." >&4
else
	$cat >&4 <<EOM
Help! I can't compile and run the ssize_t test program: please enlighten me!
(This is probably a misconfiguration in your system or libraries, and
you really ought to fix it.  Still, I'll try anyway.)

I need a type that is the same size as $sizetype, but is guaranteed to
be signed.  Common values are ssize_t, int and long.

EOM
	rp="What signed type is the same size as $sizetype?"
	. ./myread
	ssizetype="$ans"
fi
$rm -f ssize ssize$_o ssize.*