/*-
 * Copyright (c) 2009 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by David A. Holland.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef ARRAY_H
#define ARRAY_H

#define ARRAYS_CHECKED

#ifdef ARRAYS_CHECKED
#include <assert.h>
#define arrayassert assert
#else
#define arrayassert(x) ((void)(x))
#endif

////////////////////////////////////////////////////////////
// type and base operations

struct array {
        void **v;
        unsigned num, max;
};

struct array *array_create(void);
void array_destroy(struct array *);
void array_init(struct array *);
void array_cleanup(struct array *);
unsigned array_num(const struct array *);
void *array_get(const struct array *, unsigned index_);
void array_set(const struct array *, unsigned index_, void *val);
int array_setsize(struct array *, unsigned num);
int array_add(struct array *, void *val, unsigned *index_ret);
int array_insert(struct array *a, unsigned index_);
void array_remove(struct array *a, unsigned index_);

////////////////////////////////////////////////////////////
// inlining for base operations

#ifndef ARRAYINLINE
#define ARRAYINLINE extern __attribute__((__gnu_inline__)) __inline
#endif

ARRAYINLINE unsigned
array_num(const struct array *a)
{
        return a->num;
}

ARRAYINLINE void *
array_get(const struct array *a, unsigned index_)
{
        arrayassert(index_ < a->num);
        return a->v[index_];
}

ARRAYINLINE void
array_set(const struct array *a, unsigned index_, void *val)
{
        arrayassert(index_ < a->num);
        a->v[index_] = val;
}

ARRAYINLINE int
array_add(struct array *a, void *val, unsigned *index_ret)
{
        unsigned index_ = a->num;
        if (array_setsize(a, index_+1)) {
                return -1;
        }
        a->v[index_] = val;
        if (index_ret != NULL) {
                *index_ret = index_;
        }
        return 0;
}

////////////////////////////////////////////////////////////
// bits for declaring and defining typed arrays

/*
 * Usage:
 *
 * DECLARRAY_BYTYPE(foo, bar) declares "struct foo", which is
 * an array of pointers to "bar", plus the operations on it.
 *
 * DECLARRAY(foo) is equivalent to DECLARRAY_BYTYPE(fooarray, struct foo).
 *
 * DEFARRAY_BYTYPE and DEFARRAY are the same as DECLARRAY except that
 * they define the operations, and both take an extra argument INLINE.
 * For C99 this should be INLINE in header files and empty in the
 * master source file, the same as the usage of ARRAYINLINE above and
 * in array.c.
 *
 * Example usage in e.g. item.h of some game:
 * 
 * DECLARRAY_BYTYPE(stringarray, char);
 * DECLARRAY(potion);
 * DECLARRAY(sword);
 *
 * #ifndef ITEMINLINE
 * #define ITEMINLINE INLINE
 * #endif
 *
 * DEFARRAY_BYTYPE(stringarray, char, ITEMINLINE);
 * DEFARRAY(potion, ITEMINLINE);
 * DEFARRAY(sword, ITEMINLINE);
 *
 * Then item.c would do "#define ITEMINLINE" before including item.h.
 */

#define DECLARRAY_BYTYPE(ARRAY, T) \
        struct ARRAY {                                          \
                struct array arr;                               \
        };                                                      \
                                                                \
        struct ARRAY *ARRAY##_create(void);                     \
        void ARRAY##_destroy(struct ARRAY *a);                  \
        void ARRAY##_init(struct ARRAY *a);                     \
        void ARRAY##_cleanup(struct ARRAY *a);                  \
        unsigned ARRAY##_num(const struct ARRAY *a);            \
        T *ARRAY##_get(const struct ARRAY *a, unsigned index_); \
        void ARRAY##_set(struct ARRAY *a, unsigned index_, T *val); \
        int ARRAY##_setsize(struct ARRAY *a, unsigned num);     \
        int ARRAY##_add(struct ARRAY *a, T *val, unsigned *index_ret); \
        int ARRAY##_insert(struct ARRAY *a, unsigned index_);   \
        void ARRAY##_remove(struct ARRAY *a, unsigned index_)


#define DEFARRAY_BYTYPE(ARRAY, T, INLINE) \
        INLINE void                                             \
        ARRAY##_init(struct ARRAY *a)                           \
        {                                                       \
                array_init(&a->arr);                            \
        }                                                       \
                                                                \
        INLINE void                                             \
        ARRAY##_cleanup(struct ARRAY *a)                        \
        {                                                       \
                array_cleanup(&a->arr);                         \
        }                                                       \
                                                                \
        INLINE struct                                           \
        ARRAY *ARRAY##_create(void)                             \
        {                                                       \
                struct ARRAY *a;                                \
                                                                \
                a  = malloc(sizeof(*a));                        \
                if (a == NULL) {                                \
                        return NULL;                            \
                }                                               \
                ARRAY##_init(a);                                \
                return a;                                       \
        }                                                       \
                                                                \
        INLINE void                                             \
        ARRAY##_destroy(struct ARRAY *a)                        \
        {                                                       \
                ARRAY##_cleanup(a);                             \
                free(a);                                        \
        }                                                       \
                                                                \
        INLINE unsigned                                         \
        ARRAY##_num(const struct ARRAY *a)                      \
        {                                                       \
                return array_num(&a->arr);                      \
        }                                                       \
                                                                \
        INLINE T *                                              \
        ARRAY##_get(const struct ARRAY *a, unsigned index_)     \
        {                                                       \
                return (T *)array_get(&a->arr, index_);         \
        }                                                       \
                                                                \
        INLINE void                                             \
        ARRAY##_set(struct ARRAY *a, unsigned index_, T *val)   \
        {                                                       \
                array_set(&a->arr, index_, (void *)val);        \
        }                                                       \
                                                                \
        INLINE int                                              \
        ARRAY##_setsize(struct ARRAY *a, unsigned num)          \
        {                                                       \
                return array_setsize(&a->arr, num);             \
        }                                                       \
                                                                \
        INLINE int                                              \
        ARRAY##_add(struct ARRAY *a, T *val, unsigned *ret)     \
        {                                                       \
                return array_add(&a->arr, (void *)val, ret);    \
        }                                                       \
                                                                \
        INLINE int                                              \
        ARRAY##_insert(struct ARRAY *a, unsigned index_)        \
        {                                                       \
                return array_insert(&a->arr, index_);           \
        }                                                       \
                                                                \
        INLINE void                                             \
        ARRAY##_remove(struct ARRAY *a, unsigned index_)        \
        {                                                       \
                return array_remove(&a->arr, index_);           \
        }

#define DECLARRAY(T) DECLARRAY_BYTYPE(T##array, struct T)
#define DEFARRAY(T, INLINE) DEFARRAY_BYTYPE(T##array, struct T, INLINE)

////////////////////////////////////////////////////////////
// basic array types

DECLARRAY_BYTYPE(stringarray, char);
DEFARRAY_BYTYPE(stringarray, char, ARRAYINLINE);

#endif /* ARRAY_H */