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/* The ingraphs library works with both libagraph and with
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* libgraph, with all user-supplied data. For this to work,
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* the include file relies upon its context to supply a
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* definition of Agraph_t.
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typedef Agraph_t* (*opengfn)(FILE*);
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extern ingraph_state* newIngraph (ingraph_state*, char**, opengfn);
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extern void closeIngraph (ingraph_state* sp);
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extern Agraph_t* nextGraph (ingraph_state*);
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extern char* fileName (ingraph_state*);