/* This is a public domain general purpose hash table package written by Peter Moore @ UCB. */

/* @(#) st.h 5.1 89/12/14 */

#ifndef RUBY_ST_H
#define RUBY_ST_H 1

#if defined(__cplusplus)
extern "C" {
#if 0
} /* satisfy cc-mode */
#endif
#endif

#if SIZEOF_LONG == SIZEOF_VOIDP
typedef unsigned long st_data_t;
#elif SIZEOF_LONG_LONG == SIZEOF_VOIDP
typedef unsigned LONG_LONG st_data_t;
#else
# error ---->> st.c requires sizeof(void*) == sizeof(long) to be compiled. <<----
#endif
#define ST_DATA_T_DEFINED

#ifndef CHAR_BIT
# ifdef HAVE_LIMITS_H
#  include <limits.h>
# else
#  define CHAR_BIT 8
# endif
#endif
#ifndef _
# define _(args) args
#endif
#ifndef ANYARGS
# ifdef __cplusplus
#   define ANYARGS ...
# else
#   define ANYARGS
# endif
#endif

typedef struct st_table st_table;

typedef int st_compare_func(st_data_t, st_data_t);
typedef int st_hash_func(st_data_t);

struct st_hash_type {
    int (*compare)(ANYARGS /*st_data_t, st_data_t*/); /* st_compare_func* */
    int (*hash)(ANYARGS /*st_data_t*/);               /* st_hash_func* */
};

typedef st_data_t st_index_t;
#define ST_INDEX_BITS (sizeof(st_index_t) * CHAR_BIT)

struct st_table {
    const struct st_hash_type *type;
    st_index_t num_bins;
    unsigned int entries_packed : 1;
#ifdef __GNUC__
    __extension__
#endif
    st_index_t num_entries : ST_INDEX_BITS - 1;
    struct st_table_entry **bins;
    struct st_table_entry *head;
};

#define st_is_member(table,key) st_lookup(table,key,(st_data_t *)0)

enum st_retval {ST_CONTINUE, ST_STOP, ST_DELETE, ST_CHECK};

st_table *st_init_table(const struct st_hash_type *);
st_table *st_init_table_with_size(const struct st_hash_type *, int);
st_table *st_init_numtable(void);
st_table *st_init_numtable_with_size(int);
st_table *st_init_strtable(void);
st_table *st_init_strtable_with_size(int);
st_table *st_init_strcasetable(void);
st_table *st_init_strcasetable_with_size(int);
int st_delete(st_table *, st_data_t *, st_data_t *); /* returns 0:notfound 1:deleted */
int st_delete_safe(st_table *, st_data_t *, st_data_t *, st_data_t);
int st_insert(st_table *, st_data_t, st_data_t);
int st_lookup(st_table *, st_data_t, st_data_t *);
int st_get_key(st_table *, st_data_t, st_data_t *);
int st_foreach(st_table *, int (*)(ANYARGS), st_data_t);
int st_reverse_foreach(st_table *, int (*)(ANYARGS), st_data_t);
void st_add_direct(st_table *, st_data_t, st_data_t);
void st_free_table(st_table *);
void st_cleanup_safe(st_table *, st_data_t);
void st_clear(st_table *);
st_table *st_copy(st_table *);
int st_numcmp(st_data_t, st_data_t);
int st_numhash(st_data_t);
int st_strcasecmp(const char *s1, const char *s2);
int st_strncasecmp(const char *s1, const char *s2, size_t n);

#if defined(__cplusplus)
#if 0
{ /* satisfy cc-mode */
#endif
}  /* extern "C" { */
#endif

#endif /* RUBY_ST_H */
