rpn.h

#include "linenoise.h"

#define VERSION     0.69

#define MAXSIZE     10
#define DEFBASE     10
#define BASECHAR    '#'

#define ERR_DIVBYZERO   "Division by zero."
#define ERR_DOMAIN  "Argument is outside of function domain."
#define ERR_UNKNOWNCMD  "Unknown command."
#define ERR_ARGC    "Too few arguments."

struct metastack {
    struct object *t;
    struct object *b;
    struct metastack *n;
    size_t d;
};

struct object {
    double num;
    struct object *prev;
    struct object *next;
};

struct command {
    char *name;
    long numargs;
    void (*function)(void);
};

struct macro {
    char *name;
    char *operation;
    struct macro *prev;
    struct macro *next;
};

void addcommand(struct command *c);
void completion(const char *, linenoiseCompletions *);
unsigned countstack(void);
void error(char *);
struct command *findcmd(char *);
char *findmacro(char *);
void init_macros(void);
double peeknthnum(unsigned off);
struct object *pop(void);
double popnum(void);
void popobj(struct object *);
void pushnum(double);
struct object *top(void);