[Ngspice-devel] Xspice bug or unsupported feature ?

[Paolo N. <p....@ie...>]

Hi all,

I have investigated the error on Al Niessner's netlist.

Bug description: Al contributed a netlist wich contains some POLY
sources. Particularly the following one:

FB 7 99 POLY(5) VB VC VE VLP VLN 0 4.715E6 -5E6 5E6 5E6 -5E6

this line is not traslated correctly by xspice and returns an error, an
invalid free() and a segfault. 

For the error the reason is in function get_poly_dimension() in
enhtrans.c :


   /*  This is stupid, but it works. . . . */
   if ( (dim == 0) || (dim == 1) || (dim == 2) ) {
   return(dim);
   }
   else {
     return(-1);
   }

It seems that only dimensions up 2 are supported. Xspice experts what
about this ? Is it a limitation or a bug ? 


On the free() issue:

This is some involuted, the problem lies in the error message returned.
In two2three_translate() error message are returned as:
 
return("ERROR - Argument to poly() is not an integer\n");

which then become "freed" with:

  tfree(dd->li_error);

in inp_dodeck() in line 564 in file inp.c.

For the segmentation fault ... still figuring out.

Ciao,
Paolo

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