unibi_get_bool, unibi_set_bool, unibi_get_num, unibi_set_num,

 #include <unibilium.h>
 
 int unibi_get_bool(const unibi_term *ut, enum unibi_boolean b);
 void unibi_set_bool(unibi_term *ut, enum unibi_boolean b, int x);
 
 int unibi_get_num(const unibi_term *ut, enum unibi_numeric n);
 void unibi_set_num(unibi_term *ut, enum unibi_numeric n, int x);
 
 const char *unibi_get_str(const unibi_term *ut, enum unibi_string s);
 void unibi_set_str(unibi_term *ut, enum unibi_string s, const char *x);

Get/set boolean, numeric, and string capabilities. Absent numeric capabilities are represented as "-1", absent string capabilities as "NULL".

Note that "unibi_set_str" simply stores the pointer it is given; it will not free x or make a copy of the string.

unibilium.h(3)