I'm working on an XS perl module and having troubles with an SV. From perlapi, SvPV should coerce any scalar to a string, but whenever I do this, I get a SegFault. Trying example #2 for Inline::C gives me the same. Here's some basic functions I've been testing:

void foo(SV * sv)
{
    if(sv)
    {
        printf("%s\n", SvPV_nolen(sv));
    }
}

void bar(SV * sv)
{
    printf ("%i\n", SvPOK(sv));
}

Mytest2::foo('asdf'); # prints asdf

Mytest2::bar(1); # prints 0

Mytest2::foo(1); # Segmentation Fault
[download]

Do I really have to do something like this:

void foo(SV * sv)
{
    char buf[1024];
    
    switch(SvTYPE(sv))
    {
        case SVt_IV:
            snprintf(buf, sizeof(buf), "%s\n", SvPV(sv));
            break;
            
        case SVt_PV:
            snprintf(buf, sizeof(buf), "%d\n", SvIV(sv));
            break;
            
        case SVt_NV:
            snprintf(buf, sizeof(buf), "%f\n", SvNV(sv));
            break;
            
            ... handle scalar refs here ...
    }
    printf("%s\n", buf);
}
[download]

This is on perl 5.14.2, linux x86-64

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