Restarting lex portably (or flex)

Is there a way to start lex processing a new file when the
previous one was *not* processed all the way to end-of-file?
[e.g. aborted compilation due to compiling].


flex provides yyrestart(FILE *f), but the wording of the
documentation is very consistent in saying 'after end-of-file
is reached on the previous file'; however, it is unclear whether
the documentation author meant it was a precondition.


Examining the lex output on my machine here reveals that
only an internal buffer pointer (yysptr I think) needs to
be reset, but I imagine this would not be portable.


I would prefer a solution for lex, but barring that,
a clarification of yyrestart() in flex would be useful.
[Lex lets you define its input macros any way you want. -John]
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