[Bug-gsl] [bug #39990] Use standard function names for Mathieu function calls

[Patrick Alken]

URL:
  <http://savannah.gnu.org/bugs/?39990>

                 Summary: Use standard function names for Mathieu function
calls
                 Project: GNU Scientific Library
            Submitted by: psa
            Submitted on: Mon 09 Sep 2013 05:53:58 PM GMT
                Category: None
                Severity: 3 - Normal
        Operating System: 
                  Status: None
             Assigned to: None
             Open/Closed: Open
                 Release: 
         Discussion Lock: Any

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Details:

The GSL special functions are each supposed to have two alternative
functional interfaces, a pure one:

double function(x, ...)

and one allowing for full error returns:

int function_e(x, ...  gsl_sf_result * result)

But the Mathieu function code doesn't follow this convention.

It doesn't offer the former interface at all and uses the second
convention for all its functions BUT without the '_e' name extension on
its function declarations. 

This is quite error prone since it is easy to assume that *gsl_sf_result
is simply a reference to a double when in fact it is a structure that is
longer than this (a library user on Windows made exactly this mistake
and wondered why his code was causing an illegal access exception).

I am doubtful that this is an intentional feature of the Mathieu
function code so I have created the attached patch to update the code to
use the normal conventions of the GSL special functions.  (this needs
testing since I have only tried it on WIndows).




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