1 1dfba055 2020-10-07 stsp /* Auto-reallocating array for arbitrary member types. */
  2 1dfba055 2020-10-07 stsp /*
  3 1dfba055 2020-10-07 stsp  * Copyright (c) 2020 Neels Hofmeyr <neels@hofmeyr.de>
  4 1dfba055 2020-10-07 stsp  *
  5 1dfba055 2020-10-07 stsp  * Permission to use, copy, modify, and distribute this software for any
  6 1dfba055 2020-10-07 stsp  * purpose with or without fee is hereby granted, provided that the above
  7 1dfba055 2020-10-07 stsp  * copyright notice and this permission notice appear in all copies.
  8 1dfba055 2020-10-07 stsp  *
  9 1dfba055 2020-10-07 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 10 1dfba055 2020-10-07 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 11 1dfba055 2020-10-07 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 12 1dfba055 2020-10-07 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 13 1dfba055 2020-10-07 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 14 1dfba055 2020-10-07 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 15 1dfba055 2020-10-07 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 16 1dfba055 2020-10-07 stsp  */
 17 1dfba055 2020-10-07 stsp 
 18 1dfba055 2020-10-07 stsp /* Usage:
 19 1dfba055 2020-10-07 stsp  *
 20 1dfba055 2020-10-07 stsp  * ARRAYLIST(any_type_t) list;
 21 1dfba055 2020-10-07 stsp  * // OR
 22 1dfba055 2020-10-07 stsp  * typedef ARRAYLIST(any_type_t) any_type_list_t;
 23 1dfba055 2020-10-07 stsp  * any_type_list_t list;
 24 1dfba055 2020-10-07 stsp  *
 25 1dfba055 2020-10-07 stsp  * // pass the number of (at first unused) members to add on each realloc:
 26 1dfba055 2020-10-07 stsp  * ARRAYLIST_INIT(list, 128);
 27 1dfba055 2020-10-07 stsp  * any_type_t *x;
 28 1dfba055 2020-10-07 stsp  * while (bar) {
 29 1dfba055 2020-10-07 stsp  *         // This enlarges the allocated array as needed;
 30 1dfba055 2020-10-07 stsp  *         // list.head may change due to realloc:
 31 1dfba055 2020-10-07 stsp  *         ARRAYLIST_ADD(x, list);
 32 1dfba055 2020-10-07 stsp  *         if (!x)
 33 1dfba055 2020-10-07 stsp  *                 return ENOMEM; 
 34 1dfba055 2020-10-07 stsp  *         *x = random_foo_value;
 35 1dfba055 2020-10-07 stsp  * }
 36 1dfba055 2020-10-07 stsp  * for (i = 0; i < list.len; i++)
 37 1dfba055 2020-10-07 stsp  *         printf("%s", foo_to_str(list.head[i]));
 38 1dfba055 2020-10-07 stsp  * ARRAYLIST_FREE(list);
 39 1dfba055 2020-10-07 stsp  */
 40 1dfba055 2020-10-07 stsp #define ARRAYLIST(MEMBER_TYPE) \
 41 1dfba055 2020-10-07 stsp 	struct { \
 42 1dfba055 2020-10-07 stsp 		MEMBER_TYPE *head; \
 43 1dfba055 2020-10-07 stsp 		MEMBER_TYPE *p; \
 44 1dfba055 2020-10-07 stsp 		unsigned int len; \
 45 1dfba055 2020-10-07 stsp 		unsigned int allocated; \
 46 1dfba055 2020-10-07 stsp 		unsigned int alloc_blocksize; \
 47 1dfba055 2020-10-07 stsp 	}
 48 1dfba055 2020-10-07 stsp 
 49 1dfba055 2020-10-07 stsp #define ARRAYLIST_INIT(ARRAY_LIST, ALLOC_BLOCKSIZE) do { \
 50 1dfba055 2020-10-07 stsp 		(ARRAY_LIST).head = NULL; \
 51 1dfba055 2020-10-07 stsp 		(ARRAY_LIST).len = 0; \
 52 1dfba055 2020-10-07 stsp 		(ARRAY_LIST).allocated = 0; \
 53 1dfba055 2020-10-07 stsp 		(ARRAY_LIST).alloc_blocksize = ALLOC_BLOCKSIZE; \
 54 1dfba055 2020-10-07 stsp 	} while(0)
 55 1dfba055 2020-10-07 stsp 
 56 1dfba055 2020-10-07 stsp #define ARRAYLIST_ADD(NEW_ITEM_P, ARRAY_LIST) do { \
 57 1dfba055 2020-10-07 stsp 		if ((ARRAY_LIST).len && !(ARRAY_LIST).allocated) { \
 58 1dfba055 2020-10-07 stsp 			NEW_ITEM_P = NULL; \
 59 1dfba055 2020-10-07 stsp 			break; \
 60 1dfba055 2020-10-07 stsp 		} \
 61 1dfba055 2020-10-07 stsp 		if ((ARRAY_LIST).head == NULL \
 62 1dfba055 2020-10-07 stsp 		    || (ARRAY_LIST).allocated < (ARRAY_LIST).len + 1) { \
 63 1dfba055 2020-10-07 stsp 			(ARRAY_LIST).p = recallocarray((ARRAY_LIST).head, \
 64 1dfba055 2020-10-07 stsp 				(ARRAY_LIST).len, \
 65 1dfba055 2020-10-07 stsp 				(ARRAY_LIST).allocated + \
 66 1dfba055 2020-10-07 stsp 				((ARRAY_LIST).alloc_blocksize ? : 8), \
 67 1dfba055 2020-10-07 stsp 				sizeof(*(ARRAY_LIST).head)); \
 68 1dfba055 2020-10-07 stsp 			if ((ARRAY_LIST).p == NULL) { \
 69 1dfba055 2020-10-07 stsp 				NEW_ITEM_P = NULL; \
 70 1dfba055 2020-10-07 stsp 				break; \
 71 1dfba055 2020-10-07 stsp 			} \
 72 1dfba055 2020-10-07 stsp 			(ARRAY_LIST).allocated += \
 73 1dfba055 2020-10-07 stsp 				(ARRAY_LIST).alloc_blocksize ? : 8; \
 74 1dfba055 2020-10-07 stsp 			(ARRAY_LIST).head = (ARRAY_LIST).p; \
 75 1dfba055 2020-10-07 stsp 			(ARRAY_LIST).p = NULL; \
 76 1dfba055 2020-10-07 stsp 		}; \
 77 1dfba055 2020-10-07 stsp 		if ((ARRAY_LIST).head == NULL \
 78 1dfba055 2020-10-07 stsp 		    || (ARRAY_LIST).allocated < (ARRAY_LIST).len + 1) { \
 79 1dfba055 2020-10-07 stsp 			NEW_ITEM_P = NULL; \
 80 1dfba055 2020-10-07 stsp 			break; \
 81 1dfba055 2020-10-07 stsp 		} \
 82 1dfba055 2020-10-07 stsp 		(NEW_ITEM_P) = &(ARRAY_LIST).head[(ARRAY_LIST).len]; \
 83 1dfba055 2020-10-07 stsp 		(ARRAY_LIST).len++; \
 84 1dfba055 2020-10-07 stsp 	} while (0)
 85 1dfba055 2020-10-07 stsp 
 86 1dfba055 2020-10-07 stsp #define ARRAYLIST_INSERT(NEW_ITEM_P, ARRAY_LIST, AT_IDX) do { \
 87 1dfba055 2020-10-07 stsp 		ARRAYLIST_ADD(NEW_ITEM_P, ARRAY_LIST); \
 88 1dfba055 2020-10-07 stsp 		if ((NEW_ITEM_P) && (AT_IDX) < (ARRAY_LIST).len) \
 89 1dfba055 2020-10-07 stsp 			memmove(&(ARRAY_LIST).head[(AT_IDX) + 1], \
 90 1dfba055 2020-10-07 stsp 				&(ARRAY_LIST).head[AT_IDX], \
 91 1dfba055 2020-10-07 stsp 				((ARRAY_LIST).len - (AT_IDX)) \
 92 1dfba055 2020-10-07 stsp 					* sizeof(*(ARRAY_LIST).head)); \
 93 1dfba055 2020-10-07 stsp 	} while (0)
 94 1dfba055 2020-10-07 stsp 
 95 1dfba055 2020-10-07 stsp #define ARRAYLIST_CLEAR(ARRAY_LIST) \
 96 1dfba055 2020-10-07 stsp 	(ARRAY_LIST).len = 0
 97 1dfba055 2020-10-07 stsp 
 98 1dfba055 2020-10-07 stsp #define ARRAYLIST_FREE(ARRAY_LIST) \
 99 1dfba055 2020-10-07 stsp 	do { \
100 1dfba055 2020-10-07 stsp 		if ((ARRAY_LIST).head && (ARRAY_LIST).allocated) \
101 1dfba055 2020-10-07 stsp 			free((ARRAY_LIST).head); \
102 1dfba055 2020-10-07 stsp 		ARRAYLIST_INIT(ARRAY_LIST, (ARRAY_LIST).alloc_blocksize); \
103 1dfba055 2020-10-07 stsp 	} while(0)