I have written sxmlc to be as simple as possible and I know people use it in routers, to perform in-place parsing of web queries.
Unfortunately (and I'm 5 years late...) it does use memory allocation, though kept at a minimum: one buffer to read each "XML line" (what lies between < and >, sorry ;)), and many small buffer to keep track of the tag name, attributes names and values, and text (though I always wanted to use char[16] or so for those).
And it makes use of strdup/strcpy and such.
As I want that anybody can use it freely, the licence is BSD.
