/***********************************************************************

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***********************************************************************/
/**************************************************/ /**
 @file innodb_utility.h

 Created 03/15/2011      Jimmy Yang (most macros and defines are adopted
                         from utility files in the InnoDB. Namely
                         ut/ut0lst.h, ut0rnd.h and hash0hash.h etc.)
 *******************************************************/

#ifndef INNODB_UTILITY_H
#define INNODB_UTILITY_H

#include "api0api.h"
#include "config.h"

#define UT_LIST_NODE_T(TYPE)                                      \
  struct {                                                        \
    TYPE *prev; /*!< pointer to the previous node,                \
                NULL if start of list */                          \
    TYPE *next; /*!< pointer to next node, NULL if end of list */ \
  }

#define UT_LIST_BASE_NODE_T(TYPE)                             \
  struct {                                                    \
    int count;   /*!< count of nodes in list */               \
    TYPE *start; /*!< pointer to list start, NULL if empty */ \
    TYPE *end;   /*!< pointer to list end, NULL if empty */   \
  }

/** Some Macros to manipulate the list, extracted from "ut0lst.h" */
#define UT_LIST_INIT(BASE) \
  {                        \
    (BASE).count = 0;      \
    (BASE).start = NULL;   \
    (BASE).end = NULL;     \
  }

#define UT_LIST_ADD_LAST(NAME, BASE, N) \
  {                                     \
    ((BASE).count)++;                   \
    ((N)->NAME).prev = (BASE).end;      \
    ((N)->NAME).next = NULL;            \
    if ((BASE).end != NULL) {           \
      (((BASE).end)->NAME).next = (N);  \
    }                                   \
    (BASE).end = (N);                   \
    if ((BASE).start == NULL) {         \
      (BASE).start = (N);               \
    }                                   \
  }

#define UT_LIST_ADD_FIRST(NAME, BASE, N)     \
  {                                          \
    ((BASE).count)++;                        \
    ((N)->NAME).next = (BASE).start;         \
    ((N)->NAME).prev = NULL;                 \
    if (UNIV_LIKELY((BASE).start != NULL)) { \
      (((BASE).start)->NAME).prev = (N);     \
    }                                        \
    (BASE).start = (N);                      \
    if (UNIV_UNLIKELY((BASE).end == NULL)) { \
      (BASE).end = (N);                      \
    }                                        \
  }

#define UT_LIST_REMOVE_CLEAR(NAME, N) \
  ((N)->NAME.prev = (N)->NAME.next =  \
       reinterpret_cast<decltype((N)->NAME.next)>(-1))

/** Removes a node from a linked list. */
#define UT_LIST_REMOVE(NAME, BASE, N)                     \
  do {                                                    \
    ((BASE).count)--;                                     \
    if (((N)->NAME).next != NULL) {                       \
      ((((N)->NAME).next)->NAME).prev = ((N)->NAME).prev; \
    } else {                                              \
      (BASE).end = ((N)->NAME).prev;                      \
    }                                                     \
    if (((N)->NAME).prev != NULL) {                       \
      ((((N)->NAME).prev)->NAME).next = ((N)->NAME).next; \
    } else {                                              \
      (BASE).start = ((N)->NAME).next;                    \
    }                                                     \
    UT_LIST_REMOVE_CLEAR(NAME, N);                        \
  } while (0)

#define UT_LIST_GET_NEXT(NAME, N) (((N)->NAME).next)

#define UT_LIST_GET_LEN(BASE) (BASE).count

#define UT_LIST_GET_FIRST(BASE) (BASE).start

/*************************************************************/ /**
 Folds a character string ending in the null character.
 Extracted from ut0rnd.h and ut0rnd.ic.
 @return folded value */

ib_ulint_t ut_fold_string(
    /*===========*/
    const char *str); /*!< in: null-terminated string */

typedef struct hash_cell_struct {
  void *node; /*!< hash chain node, NULL if none */
} hash_cell_t;

typedef struct hash_table_struct {
  ib_ulint_t n_cells; /* number of cells in the hash table */
  hash_cell_t *array; /*!< pointer to cell array */
} hash_table_t;

#define HASH_INSERT(TYPE, NAME, TABLE, FOLD, DATA)                    \
  do {                                                                \
    hash_cell_t *cell3333;                                            \
    TYPE *struct3333;                                                 \
                                                                      \
    (DATA)->NAME = NULL;                                              \
                                                                      \
    cell3333 = hash_get_nth_cell(TABLE, hash_calc_hash(FOLD, TABLE)); \
                                                                      \
    if (cell3333->node == NULL) {                                     \
      cell3333->node = DATA;                                          \
    } else {                                                          \
      struct3333 = (TYPE *)cell3333->node;                            \
                                                                      \
      while (struct3333->NAME != NULL) {                              \
        struct3333 = (TYPE *)struct3333->NAME;                        \
      }                                                               \
                                                                      \
      struct3333->NAME = DATA;                                        \
    }                                                                 \
  } while (0)

/*******************************************************************/ /**
 Gets the first struct in a hash chain, NULL if none. */

#define HASH_GET_FIRST(TABLE, HASH_VAL) \
  (hash_get_nth_cell(TABLE, HASH_VAL)->node)

/*******************************************************************/ /**
 Gets the next struct in a hash chain, NULL if none. */

#define HASH_GET_NEXT(NAME, DATA) ((DATA)->NAME)

/********************************************************************/ /**
 Looks for a struct in a hash table. */
#define HASH_SEARCH(NAME, TABLE, FOLD, TYPE, DATA, TEST)               \
  {                                                                    \
    (DATA) = (TYPE)HASH_GET_FIRST(TABLE, hash_calc_hash(FOLD, TABLE)); \
                                                                       \
    while ((DATA) != NULL) {                                           \
      if (TEST) {                                                      \
        break;                                                         \
      } else {                                                         \
        (DATA) = (TYPE)HASH_GET_NEXT(NAME, DATA);                      \
      }                                                                \
    }                                                                  \
  }

/********************************************************************/ /**
 Cleanup items in a hash table */
#define HASH_CLEANUP(TABLE, TYPE)                         \
  do {                                                    \
    ib_ulint_t i;                                         \
    TYPE data;                                            \
                                                          \
    for (i = 0; i < TABLE->n_cells; i++) {                \
      data = (TYPE)HASH_GET_FIRST(TABLE, i);              \
                                                          \
      while (data) {                                      \
        TYPE next_data;                                   \
        next_data = (TYPE)HASH_GET_NEXT(name_hash, data); \
        innodb_config_free(data);                         \
        free(data);                                       \
        data = next_data;                                 \
      }                                                   \
    }                                                     \
                                                          \
    free(TABLE->array);                                   \
    free(TABLE);                                          \
  } while (0)

/************************************************************/ /**
 Gets the nth cell in a hash table.
 @return pointer to cell */
hash_cell_t *hash_get_nth_cell(
    /*==============*/
    hash_table_t *table, /*!< in: hash table */
    ib_ulint_t n);       /*!< in: cell index */

/*************************************************************/ /**
 Creates a hash table with >= n array cells. The actual number
 of cells is chosen to be a prime number slightly bigger than n.
 @return own: created table */
hash_table_t *hash_create(
    /*========*/
    ib_ulint_t n); /*!< in: number of array cells */

/**************************************************************/ /**
 Calculates the hash value from a folded value.
 @return hashed value */
ib_ulint_t hash_calc_hash(
    /*===========*/
    ib_ulint_t fold,      /*!< in: folded value */
    hash_table_t *table); /*!< in: hash table */

#endif /* INNODB_UTILITY_H */