sscanf & long double seems broken ?

[David C Binderman]

Hello there,

Not sure this is the correct destination, but ISO C library
is *part* of ISO C++ ...
 
I find that sscanf, when used with ISO C specifiers %Le, %Lf and %Lg,
I cannot seem to get working, for RedHat Linux 5.1 on Alpha EV5.6,
for recent egcs snapshots.

# define NEAR(a, b) ((a >= (b * 0.99)) && (a <= (b * 1.01)))

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

int
main(void)
{
	const char * const pi = "3.14159265";

	// -----------------------------
	double x = 0.0;
	sscanf( pi, "%lg", &x);
	if (NEAR( x, M_PI))
	{
		printf( "1. ok\n");
	} else {
		printf( "1. broken, got %f, expected %f\n", x, M_PI);
	};

	// -----------------------------
	long double y = 0.0;
	sscanf( pi, "%Le", &y);
	if (NEAR( y, M_PI))
	{
		printf( "2. ok\n");
	} else {
		printf( "2. broken, got %Lf, expected %Lf\n", y, (long double) M_PI);
	};

	// -----------------------------
	long double z;
	sscanf( pi, "%Lf", &z);
	if (NEAR( z, M_PI))
	{
		printf( "3. ok\n");
	} else {
		printf( "3. broken, got %Lf, expected %Lf\n", z, (long double) M_PI);
	};

	// -----------------------------
	long double w;
	sscanf( pi, "%Lg", &w);
	if (NEAR( w, M_PI))
	{
		printf( "4. ok\n");
	} else {
		printf( "4. broken, got %Lf, expected %Lf\n", w, (long double) M_PI);
	};

	return 0;
}

produces

1. ok
2. broken, got 0.000000, expected 3.141593
3. broken, got 0.000000, expected 3.141593
4. broken, got 0.000000, expected 3.141593

Is this fixed in any later ISO C library ? 

I have glibc version glibc-2.0.7-13

Regards

David C Binderman MSc BSc	+44 1293 534847		dcb@pncl.co.uk