node.h

#ifndef NODE_H
#define NODE_H

enum node_type_e
{
    NODE_COMMAND,           
    NODE_VAR,               
};

enum val_type_e
{
    VAL_SINT = 1,       
    VAL_UINT,           
    VAL_SLLONG,         
    VAL_ULLONG,         
    VAL_FLOAT,          
    VAL_LDOUBLE,        
    VAL_CHR,            
    VAL_STR,            
};

union symval_u
{
    long               sint;
    unsigned long      uint;
    long long          sllong;
    unsigned long long ullong;
    double             sfloat;
    long double        ldouble;
    char               chr;
    char              *str;
};

struct node_s
{
    enum   node_type_e type;    
    enum   val_type_e val_type; 
    union  symval_u val;        
    int    children;            
    struct node_s *first_child; 
    struct node_s *next_sibling, *prev_sibling; /*
                                                 * if this is a child node, keep
                                                 * pointers to prev/next siblings
                                                 */
};

struct  node_s *new_node(enum node_type_e type);
void    add_child_node(struct node_s *parent, struct node_s *child);
void    free_node_tree(struct node_s *node);
void    set_node_val_str(struct node_s *node, char *val);

#endif