| 12 |
|
vector_destroy_function destroy_fn; |
| 13 |
|
} vector_header; |
| 14 |
|
|
| 15 |
< |
int statgrab_vector_resize(void **vector, vector_header *h, int count); |
| 16 |
< |
|
| 17 |
< |
/* Declare a vector. Specify the init/destroy functions as NULL if you don't |
| 18 |
< |
* need them. The block size is how many items to allocate at once. */ |
| 19 |
< |
#define VECTOR_DECLARE(name, item_type, block_size, init_fn, destroy_fn) \ |
| 20 |
< |
item_type * name = NULL; \ |
| 15 |
> |
#define VECTOR_HEADER(name, item_type, block_size, init_fn, destroy_fn) \ |
| 16 |
|
vector_header name##_header = { \ |
| 17 |
|
sizeof(item_type), \ |
| 18 |
|
0, \ |
| 22 |
|
(vector_destroy_function) destroy_fn \ |
| 23 |
|
} |
| 24 |
|
|
| 25 |
+ |
/* A pointer value that won't be returned by malloc, and isn't NULL, so can be |
| 26 |
+ |
* used as a sentinel by allocation routines that need to return NULL |
| 27 |
+ |
* sometimes. */ |
| 28 |
+ |
extern char statgrab_vector_sentinel_value; |
| 29 |
+ |
static void *statgrab_vector_sentinel = &statgrab_vector_sentinel_value; |
| 30 |
+ |
|
| 31 |
+ |
/* Internal function to resize the vector. Ideally it would take void ** as the |
| 32 |
+ |
* first parameter, but ANSI strict-aliasing rules would then prevent it from |
| 33 |
+ |
* doing anything with it, so we return a sentinel value as above instead if |
| 34 |
+ |
* allocation fails. */ |
| 35 |
+ |
void *statgrab_vector_resize(void *vector, vector_header *h, int count); |
| 36 |
+ |
|
| 37 |
+ |
/* Declare a vector. Specify the init/destroy functions as NULL if you don't |
| 38 |
+ |
* need them. The block size is how many items to allocate at once. */ |
| 39 |
+ |
#define VECTOR_DECLARE(name, item_type, block_size, init_fn, destroy_fn) \ |
| 40 |
+ |
item_type *name = NULL; \ |
| 41 |
+ |
VECTOR_HEADER(name, item_type, block_size, init_fn, destroy_fn) |
| 42 |
+ |
|
| 43 |
+ |
/* As VECTOR_DECLARE, but for a static vector. */ |
| 44 |
+ |
#define VECTOR_DECLARE_STATIC(name, item_type, block_size, init_fn, destroy_fn) \ |
| 45 |
+ |
static item_type *name = NULL; \ |
| 46 |
+ |
static VECTOR_HEADER(name, item_type, block_size, init_fn, destroy_fn) |
| 47 |
+ |
|
| 48 |
|
/* Return the current size of a vector. */ |
| 49 |
|
#define VECTOR_SIZE(name) \ |
| 50 |
|
name##_header.used_count |
| 51 |
|
|
| 52 |
|
/* Resize a vector. Returns 0 on success, -1 on out-of-memory. On |
| 53 |
|
* out-of-memory, the old contents of the vector will be destroyed and the old |
| 54 |
< |
* vector will be freed. */ |
| 54 |
> |
* vector will be freed. |
| 55 |
> |
* |
| 56 |
> |
* This is ugly because it needs to check for the sentinel value. |
| 57 |
> |
*/ |
| 58 |
|
#define VECTOR_RESIZE(name, num_items) \ |
| 59 |
< |
statgrab_vector_resize((void **) &name, &name##_header, num_items) |
| 59 |
> |
(((name = statgrab_vector_resize((char *) name, &name##_header, num_items)) \ |
| 60 |
> |
== statgrab_vector_sentinel) ? -1 : 0) |
| 61 |
|
|
| 62 |
|
/* Free a vector, destroying its contents. */ |
| 63 |
|
#define VECTOR_FREE(name) \ |
| 64 |
|
VECTOR_RESIZE(name, 0) |
| 43 |
– |
|
| 65 |
|
|
