pass a non-standard object from C toTcl

[Umesh Singla]

Hi

How do I pass "reg_snapshot->ports" below C struct back to Tcl in
macports-base?

typedef struct {
    char* variant_name;
    char* variant_sign;
} variant;

typedef struct {
    char* name;
    int requested;
    char* state;
    variant* variants;
} port;

typedef struct {
    sqlite_int64 id; /* rowid in database */
    char* note;
    port* ports;
    reg_registry* reg; /* associated registry */
    char* proc; /* name of Tcl proc, if using Tcl */
} reg_snapshot;

I fetch the `ports` from a given reg_snapshot->id from SQLite, how can I
pass the resulting ports back to Tcl procedure? Do I need to have `proc` in
them too?

- Umesh
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