games/sail/array.h

   1 /*-
   2  * Copyright (c) 2009 The NetBSD Foundation, Inc.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to The NetBSD Foundation
   6  * by David A. Holland.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  20  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  27  * POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #ifndef ARRAY_H
  31 #define ARRAY_H
  32
  33 #define ARRAYS_CHECKED
  34
  35 #ifdef ARRAYS_CHECKED
  36 #include <assert.h>
  37 #define arrayassert assert
  38 #else
  39 #define arrayassert(x) ((void)(x))
  40 #endif
  41
  42 ////////////////////////////////////////////////////////////
  43 // type and base operations
  44
  45 struct array {
  46         void **v;
  47         unsigned num, max;
  48 };
  49
  50 struct array *array_create(void);
  51 void array_destroy(struct array *);
  52 void array_init(struct array *);
  53 void array_cleanup(struct array *);
  54 unsigned array_num(const struct array *);
  55 void *array_get(const struct array *, unsigned index_);
  56 void array_set(const struct array *, unsigned index_, void *val);
  57 int array_setsize(struct array *, unsigned num);
  58 int array_add(struct array *, void *val, unsigned *index_ret);
  59 int array_insert(struct array *a, unsigned index_);
  60 void array_remove(struct array *a, unsigned index_);
  61
  62 ////////////////////////////////////////////////////////////
  63 // inlining for base operations
  64
  65 #ifndef ARRAYINLINE
  66 #define ARRAYINLINE extern __attribute__((__gnu_inline__)) __inline
  67 #endif
  68
  69 ARRAYINLINE unsigned
  70 array_num(const struct array *a)
  71 {
  72         return a->num;
  73 }
  74
  75 ARRAYINLINE void *
  76 array_get(const struct array *a, unsigned index_)
  77 {
  78         arrayassert(index_ < a->num);
  79         return a->v[index_];
  80 }
  81
  82 ARRAYINLINE void
  83 array_set(const struct array *a, unsigned index_, void *val)
  84 {
  85         arrayassert(index_ < a->num);
  86         a->v[index_] = val;
  87 }
  88
  89 ARRAYINLINE int
  90 array_add(struct array *a, void *val, unsigned *index_ret)
  91 {
  92         unsigned index_ = a->num;
  93         if (array_setsize(a, index_+1)) {
  94                 return -1;
  95         }
  96         a->v[index_] = val;
  97         if (index_ret != NULL) {
  98                 *index_ret = index_;
  99         }
 100         return 0;
 101 }
 102
 103 ////////////////////////////////////////////////////////////
 104 // bits for declaring and defining typed arrays
 105
 106 /*
 107  * Usage:
 108  *
 109  * DECLARRAY_BYTYPE(foo, bar) declares "struct foo", which is
 110  * an array of pointers to "bar", plus the operations on it.
 111  *
 112  * DECLARRAY(foo) is equivalent to DECLARRAY_BYTYPE(fooarray, struct foo).
 113  *
 114  * DEFARRAY_BYTYPE and DEFARRAY are the same as DECLARRAY except that
 115  * they define the operations, and both take an extra argument INLINE.
 116  * For C99 this should be INLINE in header files and empty in the
 117  * master source file, the same as the usage of ARRAYINLINE above and
 118  * in array.c.
 119  *
 120  * Example usage in e.g. item.h of some game:
 121  *
 122  * DECLARRAY_BYTYPE(stringarray, char);
 123  * DECLARRAY(potion);
 124  * DECLARRAY(sword);
 125  *
 126  * #ifndef ITEMINLINE
 127  * #define ITEMINLINE INLINE
 128  * #endif
 129  *
 130  * DEFARRAY_BYTYPE(stringarray, char, ITEMINLINE);
 131  * DEFARRAY(potion, ITEMINLINE);
 132  * DEFARRAY(sword, ITEMINLINE);
 133  *
 134  * Then item.c would do "#define ITEMINLINE" before including item.h.
 135  */
 136
 137 #define DECLARRAY_BYTYPE(ARRAY, T) \
 138         struct ARRAY {                                          \
 139                 struct array arr;                               \
 140         };                                                      \
 141                                                                 \
 142         struct ARRAY *ARRAY##_create(void);                     \
 143         void ARRAY##_destroy(struct ARRAY *a);                  \
 144         void ARRAY##_init(struct ARRAY *a);                     \
 145         void ARRAY##_cleanup(struct ARRAY *a);                  \
 146         unsigned ARRAY##_num(const struct ARRAY *a);            \
 147         T *ARRAY##_get(const struct ARRAY *a, unsigned index_); \
 148         void ARRAY##_set(struct ARRAY *a, unsigned index_, T *val); \
 149         int ARRAY##_setsize(struct ARRAY *a, unsigned num);     \
 150         int ARRAY##_add(struct ARRAY *a, T *val, unsigned *index_ret); \
 151         int ARRAY##_insert(struct ARRAY *a, unsigned index_);   \
 152         void ARRAY##_remove(struct ARRAY *a, unsigned index_)
 153
 154
 155 #define DEFARRAY_BYTYPE(ARRAY, T, INLINE) \
 156         INLINE void                                             \
 157         ARRAY##_init(struct ARRAY *a)                           \
 158         {                                                       \
 159                 array_init(&a->arr);                            \
 160         }                                                       \
 161                                                                 \
 162         INLINE void                                             \
 163         ARRAY##_cleanup(struct ARRAY *a)                        \
 164         {                                                       \
 165                 array_cleanup(&a->arr);                         \
 166         }                                                       \
 167                                                                 \
 168         INLINE struct                                           \
 169         ARRAY *ARRAY##_create(void)                             \
 170         {                                                       \
 171                 struct ARRAY *a;                                \
 172                                                                 \
 173                 a  = malloc(sizeof(*a));                        \
 174                 if (a == NULL) {                                \
 175                         return NULL;                            \
 176                 }                                               \
 177                 ARRAY##_init(a);                                \
 178                 return a;                                       \
 179         }                                                       \
 180                                                                 \
 181         INLINE void                                             \
 182         ARRAY##_destroy(struct ARRAY *a)                        \
 183         {                                                       \
 184                 ARRAY##_cleanup(a);                             \
 185                 free(a);                                        \
 186         }                                                       \
 187                                                                 \
 188         INLINE unsigned                                         \
 189         ARRAY##_num(const struct ARRAY *a)                      \
 190         {                                                       \
 191                 return array_num(&a->arr);                      \
 192         }                                                       \
 193                                                                 \
 194         INLINE T *                                              \
 195         ARRAY##_get(const struct ARRAY *a, unsigned index_)     \
 196         {                                                       \
 197                 return (T *)array_get(&a->arr, index_);         \
 198         }                                                       \
 199                                                                 \
 200         INLINE void                                             \
 201         ARRAY##_set(struct ARRAY *a, unsigned index_, T *val)   \
 202         {                                                       \
 203                 array_set(&a->arr, index_, (void *)val);        \
 204         }                                                       \
 205                                                                 \
 206         INLINE int                                              \
 207         ARRAY##_setsize(struct ARRAY *a, unsigned num)          \
 208         {                                                       \
 209                 return array_setsize(&a->arr, num);             \
 210         }                                                       \
 211                                                                 \
 212         INLINE int                                              \
 213         ARRAY##_add(struct ARRAY *a, T *val, unsigned *ret)     \
 214         {                                                       \
 215                 return array_add(&a->arr, (void *)val, ret);    \
 216         }                                                       \
 217                                                                 \
 218         INLINE int                                              \
 219         ARRAY##_insert(struct ARRAY *a, unsigned index_)        \
 220         {                                                       \
 221                 return array_insert(&a->arr, index_);           \
 222         }                                                       \
 223                                                                 \
 224         INLINE void                                             \
 225         ARRAY##_remove(struct ARRAY *a, unsigned index_)        \
 226         {                                                       \
 227                 return array_remove(&a->arr, index_);           \
 228         }
 229
 230 #define DECLARRAY(T) DECLARRAY_BYTYPE(T##array, struct T)
 231 #define DEFARRAY(T, INLINE) DEFARRAY_BYTYPE(T##array, struct T, INLINE)
 232
 233 ////////////////////////////////////////////////////////////
 234 // basic array types
 235
 236 DECLARRAY_BYTYPE(stringarray, char);
 237 DEFARRAY_BYTYPE(stringarray, char, ARRAYINLINE);
 238
 239 #endif /* ARRAY_H */