rxvt-unicode/src/salloc.C

#include "salloc.h"

#define SALLOC_BLOCK 65536 // size of basic block to allocate

rxvt_salloc::rxvt_salloc (unsigned int size)
{
  this->size = size < sizeof (chain) ? sizeof (chain) : size;
  firstline = 0;
  firstblock = 0;
  firstfree = SALLOC_BLOCK;
}

rxvt_salloc::~rxvt_salloc ()
{
  while (firstblock)
    {
      chain *next = firstblock->next;
      ::free (firstblock);
      firstblock = next;
    }
}

void *
rxvt_salloc::alloc ()
{
  void *r;

  if (firstline)
    {
      r = (void *)firstline;
      firstline = firstline->next;
    }
  else
    {
      if (firstfree + size > SALLOC_BLOCK)
        {
          chain *next = (chain *)rxvt_malloc ((SALLOC_BLOCK - sizeof (chain)) / size * size + sizeof (chain));
          next->next = firstblock;
          firstblock = next;
          firstfree = sizeof (chain);
        }

      r = (void *)((char *)firstblock + firstfree);

      firstfree += size;
    }

  return r;
}

void
rxvt_salloc::free (void *data)
{
  chain *line = (chain *)data;
  line->next = firstline;
  firstline = line;
}

Revision:	1.4
Committed:	Sat Jan 31 00:20:21 2004 UTC (20 years, 3 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	before_astyle, after_astyle
Changes since 1.3:	+1 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	#include "salloc.h"
2
3			#define SALLOC_BLOCK 65536 // size of basic block to allocate
4
5	pcg	1.4	rxvt_salloc::rxvt_salloc (unsigned int size)
6	pcg	1.1	{
7			this->size = size < sizeof (chain) ? sizeof (chain) : size;
8			firstline = 0;
9			firstblock = 0;
10			firstfree = SALLOC_BLOCK;
11			}
12
13			rxvt_salloc::~rxvt_salloc ()
14			{
15			while (firstblock)
16			{
17			chain *next = firstblock->next;
18			::free (firstblock);
19			firstblock = next;
20			}
21			}
22
23			void *
24			rxvt_salloc::alloc ()
25			{
26			void *r;
27
28			if (firstline)
29			{
30			r = (void *)firstline;
31			firstline = firstline->next;
32			}
33			else
34			{
35			if (firstfree + size > SALLOC_BLOCK)
36			{
37			chain next = (chain )rxvt_malloc ((SALLOC_BLOCK - sizeof (chain)) / size * size + sizeof (chain));
38			next->next = firstblock;
39			firstblock = next;
40			firstfree = sizeof (chain);
41			}
42
43			r = (void )((char )firstblock + firstfree);
44
45			firstfree += size;
46			}
47
48			return r;
49			}
50
51			void
52			rxvt_salloc::free (void *data)
53			{
54			chain line = (chain )data;
55			line->next = firstline;
56			firstline = line;
57			}
58