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authorDaniel Jacobowitz <drow@false.org>2006-05-04 15:12:00 +0000
committerDaniel Jacobowitz <drow@false.org>2006-05-04 15:12:00 +0000
commit482dd2f67b3254c4b72ecce7d903f9f25f9d9dda (patch)
tree8ae107011e30b7fc930b1ab77fc067997422e695 /mmalloc/mrealloc.c
parent39a7806daee10b8020ce7be18e54cab69c9e699f (diff)
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2006-05-04 Steve Ellcey <sje@cup.hp.com>
* blt, iwidgets, mmalloc: Remove directories.
Diffstat (limited to 'mmalloc/mrealloc.c')
-rw-r--r--mmalloc/mrealloc.c163
1 files changed, 0 insertions, 163 deletions
diff --git a/mmalloc/mrealloc.c b/mmalloc/mrealloc.c
deleted file mode 100644
index e2004aa..0000000
--- a/mmalloc/mrealloc.c
+++ /dev/null
@@ -1,163 +0,0 @@
-/* Change the size of a block allocated by `mmalloc'.
- Copyright 1990, 1991 Free Software Foundation
- Written May 1989 by Mike Haertel.
-
-The GNU C Library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public License as
-published by the Free Software Foundation; either version 2 of the
-License, or (at your option) any later version.
-
-The GNU C Library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-Library General Public License for more details.
-
-You should have received a copy of the GNU Library General Public
-License along with the GNU C Library; see the file COPYING.LIB. If
-not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.
-
- The author may be reached (Email) at the address mike@ai.mit.edu,
- or (US mail) as Mike Haertel c/o Free Software Foundation. */
-
-#include <string.h> /* Prototypes for memcpy, memmove, memset, etc */
-
-#include "mmprivate.h"
-
-/* Resize the given region to the new size, returning a pointer
- to the (possibly moved) region. This is optimized for speed;
- some benchmarks seem to indicate that greater compactness is
- achieved by unconditionally allocating and copying to a
- new region. This module has incestuous knowledge of the
- internals of both mfree and mmalloc. */
-
-PTR
-mrealloc (md, ptr, size)
- PTR md;
- PTR ptr;
- size_t size;
-{
- struct mdesc *mdp;
- PTR result;
- int type;
- size_t block, blocks, oldlimit;
-
- if (size == 0)
- {
- mfree (md, ptr);
- return (mmalloc (md, 0));
- }
- else if (ptr == NULL)
- {
- return (mmalloc (md, size));
- }
-
- mdp = MD_TO_MDP (md);
-
- if (mdp -> mrealloc_hook != NULL)
- {
- return ((*mdp -> mrealloc_hook) (md, ptr, size));
- }
-
- block = BLOCK (ptr);
-
- type = mdp -> heapinfo[block].busy.type;
- switch (type)
- {
- case 0:
- /* Maybe reallocate a large block to a small fragment. */
- if (size <= BLOCKSIZE / 2)
- {
- result = mmalloc (md, size);
- if (result != NULL)
- {
- memcpy (result, ptr, size);
- mfree (md, ptr);
- return (result);
- }
- }
-
- /* The new size is a large allocation as well;
- see if we can hold it in place. */
- blocks = BLOCKIFY (size);
- if (blocks < mdp -> heapinfo[block].busy.info.size)
- {
- /* The new size is smaller; return excess memory to the free list. */
- mdp -> heapinfo[block + blocks].busy.type = 0;
- mdp -> heapinfo[block + blocks].busy.info.size
- = mdp -> heapinfo[block].busy.info.size - blocks;
- mdp -> heapinfo[block].busy.info.size = blocks;
- mfree (md, ADDRESS (block + blocks));
- result = ptr;
- }
- else if (blocks == mdp -> heapinfo[block].busy.info.size)
- {
- /* No size change necessary. */
- result = ptr;
- }
- else
- {
- /* Won't fit, so allocate a new region that will.
- Free the old region first in case there is sufficient
- adjacent free space to grow without moving. */
- blocks = mdp -> heapinfo[block].busy.info.size;
- /* Prevent free from actually returning memory to the system. */
- oldlimit = mdp -> heaplimit;
- mdp -> heaplimit = 0;
- mfree (md, ptr);
- mdp -> heaplimit = oldlimit;
- result = mmalloc (md, size);
- if (result == NULL)
- {
- mmalloc (md, blocks * BLOCKSIZE);
- return (NULL);
- }
- if (ptr != result)
- {
- memmove (result, ptr, blocks * BLOCKSIZE);
- }
- }
- break;
-
- default:
- /* Old size is a fragment; type is logarithm
- to base two of the fragment size. */
- if (size > (size_t) (1 << (type - 1)) && size <= (size_t) (1 << type))
- {
- /* The new size is the same kind of fragment. */
- result = ptr;
- }
- else
- {
- /* The new size is different; allocate a new space,
- and copy the lesser of the new size and the old. */
- result = mmalloc (md, size);
- if (result == NULL)
- {
- return (NULL);
- }
- memcpy (result, ptr, MIN (size, (size_t) 1 << type));
- mfree (md, ptr);
- }
- break;
- }
-
- return (result);
-}
-
-/* When using this package, provide a version of malloc/realloc/free built
- on top of it, so that if we use the default sbrk() region we will not
- collide with another malloc package trying to do the same thing, if
- the application contains any "hidden" calls to malloc/realloc/free (such
- as inside a system library). */
-
-PTR
-realloc (ptr, size)
- PTR ptr;
- size_t size;
-{
- PTR result;
-
- result = mrealloc ((PTR) NULL, ptr, size);
- return (result);
-}