[cffi-devel] usage question

[Bruce Butterfield]

Due to my pretty rusty C skills I have what I hope is a naive question.
I'm writing a cffi interface to the tidy lib which among other things 
has the following construct:

// in include file:
struct _TidyBuffer;
typedef struct _TidyBuffer TidyBuffer;
typedef void* TidyDoc;

// example caller:
TidyBuffer output = {0};
TidyDoc tdoc = tidyCreate();
...
tidySaveBuffer(tdoc, &output)
...


so, tidy allocates some memory from a pointer reference supplied by the 
client. How do I declare and pass this reference to the foreign function?