The results are not identical to running src2www at your location. In particular, since you can submit only a single file through this form, we won't attempt to build a global alphabetic index of symbols.
Old-style (K&R) C, or Ansi C with old-style function headers, will not be properly indexed. A function header like
int foo(int i) {should be correctly indexed, but
int foo(i) int i; {will be mistaken for a prototype.
Simple C++ may be recognized, but templates and some other features will not be recognized.
Macros can confuse c2html, especially if they contain control flow or if they are expanded in function headers.