dfunctions.h

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#ifndef DFUNCTIONS_H
#define DFUNCTIONS_H
 
#include <glib.h>
#include <epan/ftypes/ftypes.h>
#include <epan/dfilter/syntax-tree.h>
#include <epan/dfilter/dfilter-int.h>
 
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
 
/* Functions take any number of arguments and return 1. */
 
#define dfunc_fail(dfw, node, ...) \
    do { \
        ws_noisy("Semantic check failed here."); \
        dfilter_fail_throw(dfw, DF_ERROR_GENERIC, stnode_location(node), __VA_ARGS__); \
    } while (0)
 
/* The run-time logic of the dfilter function */
typedef bool (*DFFuncType)(GSList *stack, uint32_t arg_count, df_cell_t *retval);
 
/* The semantic check for the dfilter function */
typedef ftenum_t (*DFSemCheckType)(dfwork_t *dfw, const char *func_name, ftenum_t lhs_ftype,
                                GSList *param_list, df_loc_t func_loc);
 
typedef struct {
    const char*    name;                     
    DFFuncType     function;                 
    unsigned       min_nargs;                
    unsigned       max_nargs;                
    ftenum_t       return_ftype;             
    DFSemCheckType semcheck_param_function;  
} df_func_def_t;
 
WS_DLL_PUBLIC
ftenum_t
df_semcheck_param(dfwork_t *dfw, const char *func_name, ftenum_t logical_ftype,
                            stnode_t *param, df_loc_t func_loc);
 
void df_func_init(void);
 
WS_DLL_PUBLIC
bool df_func_register(df_func_def_t *func);
 
WS_DLL_PUBLIC
bool df_func_deregister(df_func_def_t *func);
 
WS_DLL_PUBLIC
df_func_def_t* df_func_lookup(const char *name);
 
WS_DLL_PUBLIC
GPtrArray *df_func_name_list(void);
 
void df_func_cleanup(void);
 
#ifdef __cplusplus
}
#endif /* __cplusplus */
 
#endif