"Renewc"
  The XSUB-writer's interface to the C "realloc" function, with cast.

  Memory obtained by this should ONLY be freed with "Safefree".

    void  Renewc(void* ptr, int nitems, type, cast)

[download]

So actually not how you commented it. The Renewc function modifies the pointer rather than returning anything.

Basically the OP's new version of the code works because sizeof(int) < 2*sizeof(char*)

The renewc is unneeded though, it could just be 

message= (EdjeMessageStringSet*) safemalloc(
  sizeof(EdjeMessageStringSet) + (count-1)*sizeof(char*)
)

[download]

For this code, the Newx type casting & sizing behavior is simply the wrong API to try to use.

In reply to Re^4: Perl XS binding to a struct with an array of chars* by NERDVANA
in thread Perl XS binding to a struct with an array of chars* by MaxPerl

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