R-alpha: new version

[Thomas Lumley]

I have traced down the segfault that Venkat and I reported with C
routines. It is in S_alloc, which explains why only some routines cause
problems.

The problem is that size is declared but never set, resulting in
(xxgdb) print size
$10 = 1081754432

I don't know precisely what is happening here but my guess is that we
should have size=nelem*eltsize/sizeof(char). 

(Q: Is it necessary or even true that eltsize/sizeof(char) is always an
integer?) 

char *S_alloc(long nelem, int eltsize)
{
	unsigned int i, size;
	char *p = R_alloc(nelem, eltsize);
	for(i=0 ; i<size; i++)
		p[i] = 0;
	return p;
}


Thomas Lumley
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