Function xsltSetTransformErrorFunc 

pub fn xsltSetTransformErrorFunc(
    ctxt: *mut _xsltTransformContext,
    ctx: *mut c_void,
    handler: Option<unsafe extern "C" fn(*mut c_void, *const c_char)>,
)

Set the transform error handler for a context.

Registers a per-context error handler that will be called for every error reported during the transformation. Pass None to restore the default handler.

Parameters

• ctxt — The transform context, or std::ptr::null_mut() for the global handler.
• ctx — Opaque user-data pointer passed to the handler.
• handler — The error handler function, or None to reset.