enum VarCacheIdx { VDateStyle = 0, VClientEncoding, VTimeZone, VStdStr, VAppName, NumVars }; typedef struct VarCache VarCache; struct VarCache { struct PStr *var_list[NumVars]; }; bool varcache_set(VarCache *cache, const char *key, const char *value) /* _MUSTCHECK */; bool varcache_apply(PgSocket *server, PgSocket *client, bool *changes_p) _MUSTCHECK; void varcache_fill_unset(VarCache *src, PgSocket *dst); void varcache_clean(VarCache *cache); void varcache_add_params(PktBuf *pkt, VarCache *vars);