Block Allocator

Types

type ymo_blalloc_t

Structure used to wrap stack-style block storage.

Definition

typedef struct ymo_blalloc {
    blit_t* current;
    blit_t* end;
    size_t  total;
    size_t  remain;
    blit_t  val[FLEXIBLE_ARRAY_MEMBER];
} ymo_blalloc_t;

Functions

ymo_blalloc_t *ymo_blalloc_create(size_t n)

Create a block alloc pool.

Parameters

• n – size, in bytes, of the pool to create.

Returns

pointer to ymo_blalloc_t on success; NULL, otherwise.

YMO_BLALLOC

Allocate a type from the block e.g. my_type_t* my_var = YMO_BLALLOC(block, my_type_t)

Definition

#define YMO_BLALLOC(b,t) \
        ymo_blalloc(b, alignof(t), sizeof(t))

void *ymo_blalloc(ymo_blalloc_t *block, size_t a, size_t n)

Allocate a type from the block (prefer YMO_BLALLOC ).

e.g.:

my_type_t* obj = ymo_blalloc(
    block, alignof(my_type_t), sizeof(my_type_t));

char* my_str = ymo_blalloc(block, alignof(char), strlen(my_str));

Parameters

• t_align – type alignment (per alignof)

• t_size – type size in bytes (per sizeof)

Returns

allocated space on success; NULL with errno set on failure.

char *ymo_blalloc_strdup(struct ymo_blalloc *block, const char *s)

strdup implemented on top of blalloc. If there’s space enough: you’ll get a copy. Otherwise, it’ll return NULL.

Parameters

• block – memory block used to allocate storage for s

• s – the string to copy

Returns

a pointer to the duplicated string on success; NULL with errno set, otherwise

void ymo_blalloc_reset(ymo_blalloc_t *block)

Reset a block alloc pool.

Parameters

• block – the pool to reset

void ymo_blalloc_free(ymo_blalloc_t *block)

Free a block alloc pool.

Warning

This is the pool free function — i.e. it is used to free the ymo_blalloc_t created by ymo_blalloc_create.

Don’t call this function to free memory allocated allocated from a pool by ymo_blalloc()!

Parameters

• block – the pool to free