(OP here)

I went with the fmemopen/open_memstream route.

They seem to do what I want without too much trouble, and I can live with the fact that they aren't portable - the library itself is pretty much Linux-only at this point.

In reply to Re^2: Use a string as a FILE * stream in XS code by Anonymous Monk
in thread Use a string as a FILE * stream in XS code by Anonymous Monk

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