Backport Tim's checkin 2.199: Fix buglet reported on c.l.py: map(fnc, file.xreadlines()) blows up. Took away map()'s insistence that sequences support __len__, and cleaned up the convoluted code that made it *look* like it really cared about __len__ (in fact the old ->len field was only *used* as a flag bit, as the main loop only looked at its sign bit, setting the field to -1 when IndexError got raised; renamed the field to ->saw_IndexError instead).

/* Portable fmod(x, y) implementation for systems that don't have it */

#include "config.h"

#include "pyport.h"
#include <errno.h>

double
fmod(double x, double y)
{
	double i, f;
	
	if (y == 0.0) {
		errno = EDOM;
		return 0.0;
	}
	
	/* return f such that x = i*y + f for some integer i
	   such that |f| < |y| and f has the same sign as x */
	
	i = floor(x/y);
	f = x - i*y;
	if ((x < 0.0) != (y < 0.0))
		f = f-y;
	return f;
}