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#include "alloc.h"
#include "gralloc.h"
#include "compile.h"
/* TODO
* calloc stuff.
* implement arithmetic capacity strategy.
*/
#define DEBUG 0
typedef struct memnext
{ struct memnext* next
;
} memnext ;
/* future idea; use higher bita as perbytage style coefficients. duh. */
#define n1(grim) ((grim->flags >> 16) & 0xFF)
#define n2(grim) ((grim->flags >> 24) & 0xFF)
typedef struct grim_buf
{ char* units /* n_units * (sizeof(memnext) + sz_unit) */
; long n_units /* number of units available for this struct */
; struct grim_buf* prev
;
} grim_buf ;
struct mcxGrim
{ grim_buf* buf
; long sz_unit /* size of one unit */
; memnext* na /* next available */
; long ct /* number in use */
; mcxbits flags /* allocation strategy, numbers */
;
} ;
grim_buf* grim_buf_new
( long sz_unit
, long n_units
)
{ long i
; grim_buf* buf
; char* units
; long sz_load = sizeof(memnext) + sz_unit
; if (!(buf = mcxAlloc(sizeof(grim_buf), RETURN_ON_FAIL)))
return NULL
; if
( !(buf->units
= units
= mcxAlloc(n_units * sz_load, RETURN_ON_FAIL)
) )
{ mcxFree(buf)
; return NULL
; }
buf->prev = NULL
; buf->n_units = n_units
;if (DEBUG)
fprintf (stderr, "Extending grim with <%ld> units\n", n_units);
; for (i=0;i<n_units-1;i++)
((memnext*) (units + i * sz_load))->next
= (memnext*) (units + (i+1) * sz_load)
; ((memnext*) (buf->units + (n_units-1) * sz_load))->next = NULL
; return buf
; }
mcxGrim* mcxGrimNew
( long sz_unit
, long n_units
, mcxbits options
)
{ mcxGrim* src = mcxAlloc(sizeof(mcxGrim), RETURN_ON_FAIL)
; if (!src)
return NULL
; if (!(src->buf = grim_buf_new(sz_unit, n_units)))
{ mcxFree(src)
; return NULL
; }
src->buf->prev = src->buf
; src->flags = options
; src->na = (void*) src->buf->units
; src->ct = 0
; src->sz_unit = sz_unit
; return src
; }
mcxbool mcx_grim_extend
( mcxGrim* src
)
{ grim_buf* prevbuf = src->buf->prev
; long diff = prevbuf->n_units - prevbuf->prev->n_units
; long n_units = (src->flags & MCX_GRIM_GEOMETRIC) || !diff
? 2 * prevbuf->n_units
: prevbuf->n_units + (diff > 0 ? diff : -diff)
; grim_buf* newbuf = grim_buf_new(src->sz_unit, n_units)
; if (!newbuf)
return FALSE
; newbuf->prev = src->buf->prev
; src->buf->prev = newbuf
; src->na = (void*) newbuf->units
; return TRUE
; }
void mcxGrimFree
( mcxGrim** srcp
)
{ grim_buf *buf = (*srcp)->buf, *this = buf->prev
; buf->prev = NULL
; while (this)
{ grim_buf* tmp = this->prev
; mcxFree(this->units)
; mcxFree(this)
; this = tmp
; }
mcxFree(*srcp)
; *srcp = NULL
; }
void mcxGrimLet
( mcxGrim* src
, void* mem
)
{ memnext* na = (void*) ((char*) mem - sizeof(memnext))
; na->next = src->na ? src->na->next : NULL
; src->na = na
; src->ct--
; }
void* mcxGrimGet
( mcxGrim* src
)
{ void* mem
; if (!src->na && !mcx_grim_extend(src))
return NULL
; mem = ((char*) src->na) + sizeof(memnext)
; src->na = src->na->next
; src->ct++
; return mem
; }
long mcxGrimCount
( mcxGrim* src
)
{ return src->ct
; }
#undef DEBUG
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