Initial revision

1 files changed, 1638 insertions, 0 deletions

diff --git a/src/gmalloc.c b/src/gmalloc.c
new file mode 100644
index 00000000000..7e7a8939238
--- /dev/null
+++ b/src/gmalloc.c
@@ -0,0 +1,1638 @@
+/* This file is no longer automatically generated from libc.  */
+
+#define _MALLOC_INTERNAL
+
+/* The malloc headers and source files from the C library follow here.  */
+
+/* Declarations for `malloc' and friends.
+   Copyright 1990, 91, 92, 93, 95, 96 Free Software Foundation, Inc.
+                  Written May 1989 by Mike Haertel.
+
+This 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.
+
+This 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 this library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, 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.  */
+
+#ifndef _MALLOC_H
+
+#define _MALLOC_H       1
+
+#ifdef _MALLOC_INTERNAL
+
+#ifdef  HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#if defined (__cplusplus) || (defined (__STDC__) && __STDC__)
+#undef  __P
+#define __P(args)       args
+#undef  __ptr_t
+#define __ptr_t         void *
+#else /* Not C++ or ANSI C.  */
+#undef  __P
+#define __P(args)       ()
+#undef  const
+#define const
+#undef  __ptr_t
+#define __ptr_t         char *
+#endif /* C++ or ANSI C.  */
+
+#if     defined(_LIBC) || defined(STDC_HEADERS) || defined(USG)
+#include <string.h>
+#else
+#ifndef memset
+#define memset(s, zero, n)      bzero ((s), (n))
+#endif
+#ifndef memcpy
+#define memcpy(d, s, n)         bcopy ((s), (d), (n))
+#endif
+#endif
+
+#if     defined (__GNU_LIBRARY__) || (defined (__STDC__) && __STDC__)
+#include <limits.h>
+#else
+#ifndef CHAR_BIT
+#define CHAR_BIT        8
+#endif
+#endif
+
+#ifdef  HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#endif  /* _MALLOC_INTERNAL.  */
+
+
+#ifdef  __cplusplus
+extern "C"
+{
+#endif
+
+#if defined (__STDC__) && __STDC__
+#include <stddef.h>
+#define __malloc_size_t         size_t
+#define __malloc_ptrdiff_t      ptrdiff_t
+#else
+#define __malloc_size_t         unsigned int
+#define __malloc_ptrdiff_t      int
+#endif
+
+#ifndef NULL
+#define NULL    0
+#endif
+
+
+/* Allocate SIZE bytes of memory.  */
+extern __ptr_t malloc __P ((__malloc_size_t __size));
+/* Re-allocate the previously allocated block
+   in __ptr_t, making the new block SIZE bytes long.  */
+extern __ptr_t realloc __P ((__ptr_t __ptr, __malloc_size_t __size));
+/* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
+extern __ptr_t calloc __P ((__malloc_size_t __nmemb, __malloc_size_t __size));
+/* Free a block allocated by `malloc', `realloc' or `calloc'.  */
+extern void free __P ((__ptr_t __ptr));
+
+/* Allocate SIZE bytes allocated to ALIGNMENT bytes.  */
+#if ! (defined (_MALLOC_INTERNAL) && __DJGPP__ - 0 == 1) /* Avoid conflict.  */
+extern __ptr_t memalign __P ((__malloc_size_t __alignment,
+                              __malloc_size_t __size));
+#endif
+
+/* Allocate SIZE bytes on a page boundary.  */
+#if ! (defined (_MALLOC_INTERNAL) && defined (GMALLOC_INHIBIT_VALLOC))
+extern __ptr_t valloc __P ((__malloc_size_t __size));
+#endif
+
+
+#ifdef _MALLOC_INTERNAL
+
+/* The allocator divides the heap into blocks of fixed size; large
+   requests receive one or more whole blocks, and small requests
+   receive a fragment of a block.  Fragment sizes are powers of two,
+   and all fragments of a block are the same size.  When all the
+   fragments in a block have been freed, the block itself is freed.  */
+#define INT_BIT         (CHAR_BIT * sizeof(int))
+#define BLOCKLOG        (INT_BIT > 16 ? 12 : 9)
+#define BLOCKSIZE       (1 << BLOCKLOG)
+#define BLOCKIFY(SIZE)  (((SIZE) + BLOCKSIZE - 1) / BLOCKSIZE)
+
+/* Determine the amount of memory spanned by the initial heap table
+   (not an absolute limit).  */
+#define HEAP            (INT_BIT > 16 ? 4194304 : 65536)
+
+/* Number of contiguous free blocks allowed to build up at the end of
+   memory before they will be returned to the system.  */
+#define FINAL_FREE_BLOCKS       8
+
+/* Data structure giving per-block information.  */
+typedef union
+  {
+    /* Heap information for a busy block.  */
+    struct
+      {
+        /* Zero for a large (multiblock) object, or positive giving the
+           logarithm to the base two of the fragment size.  */
+        int type;
+        union
+          {
+            struct
+              {
+                __malloc_size_t nfree; /* Free frags in a fragmented block.  */
+                __malloc_size_t first; /* First free fragment of the block.  */
+              } frag;
+            /* For a large object, in its first block, this has the number
+               of blocks in the object.  In the other blocks, this has a
+               negative number which says how far back the first block is.  */
+            __malloc_ptrdiff_t size;
+          } info;
+      } busy;
+    /* Heap information for a free block
+       (that may be the first of a free cluster).  */
+    struct
+      {
+        __malloc_size_t size;   /* Size (in blocks) of a free cluster.  */
+        __malloc_size_t next;   /* Index of next free cluster.  */
+        __malloc_size_t prev;   /* Index of previous free cluster.  */
+      } free;
+  } malloc_info;
+
+/* Pointer to first block of the heap.  */
+extern char *_heapbase;
+
+/* Table indexed by block number giving per-block information.  */
+extern malloc_info *_heapinfo;
+
+/* Address to block number and vice versa.  */
+#define BLOCK(A)        (((char *) (A) - _heapbase) / BLOCKSIZE + 1)
+#define ADDRESS(B)      ((__ptr_t) (((B) - 1) * BLOCKSIZE + _heapbase))
+
+/* Current search index for the heap table.  */
+extern __malloc_size_t _heapindex;
+
+/* Limit of valid info table indices.  */
+extern __malloc_size_t _heaplimit;
+
+/* Doubly linked lists of free fragments.  */
+struct list
+  {
+    struct list *next;
+    struct list *prev;
+  };
+
+/* Free list headers for each fragment size.  */
+extern struct list _fraghead[];
+
+/* List of blocks allocated with `memalign' (or `valloc').  */
+struct alignlist
+  {
+    struct alignlist *next;
+    __ptr_t aligned;            /* The address that memaligned returned.  */
+    __ptr_t exact;              /* The address that malloc returned.  */
+  };
+extern struct alignlist *_aligned_blocks;
+
+/* Instrumentation.  */
+extern __malloc_size_t _chunks_used;
+extern __malloc_size_t _bytes_used;
+extern __malloc_size_t _chunks_free;
+extern __malloc_size_t _bytes_free;
+
+/* Internal versions of `malloc', `realloc', and `free'
+   used when these functions need to call each other.
+   They are the same but don't call the hooks.  */
+extern __ptr_t _malloc_internal __P ((__malloc_size_t __size));
+extern __ptr_t _realloc_internal __P ((__ptr_t __ptr, __malloc_size_t __size));
+extern void _free_internal __P ((__ptr_t __ptr));
+
+#endif /* _MALLOC_INTERNAL.  */
+
+/* Given an address in the middle of a malloc'd object,
+   return the address of the beginning of the object.  */
+extern __ptr_t malloc_find_object_address __P ((__ptr_t __ptr));
+
+/* Underlying allocation function; successive calls should
+   return contiguous pieces of memory.  */
+extern __ptr_t (*__morecore) __P ((__malloc_ptrdiff_t __size));
+
+/* Default value of `__morecore'.  */
+extern __ptr_t __default_morecore __P ((__malloc_ptrdiff_t __size));
+
+/* If not NULL, this function is called after each time
+   `__morecore' is called to increase the data size.  */
+extern void (*__after_morecore_hook) __P ((void));
+
+/* Number of extra blocks to get each time we ask for more core.
+   This reduces the frequency of calling `(*__morecore)'.  */
+extern __malloc_size_t __malloc_extra_blocks;
+
+/* Nonzero if `malloc' has been called and done its initialization.  */
+extern int __malloc_initialized;
+/* Function called to initialize malloc data structures.  */
+extern int __malloc_initialize __P ((void));
+
+/* Hooks for debugging versions.  */
+extern void (*__malloc_initialize_hook) __P ((void));
+extern void (*__free_hook) __P ((__ptr_t __ptr));
+extern __ptr_t (*__malloc_hook) __P ((__malloc_size_t __size));
+extern __ptr_t (*__realloc_hook) __P ((__ptr_t __ptr, __malloc_size_t __size));
+extern __ptr_t (*__memalign_hook) __P ((__malloc_size_t __size,
+                                        __malloc_size_t __alignment));
+
+/* Return values for `mprobe': these are the kinds of inconsistencies that
+   `mcheck' enables detection of.  */
+enum mcheck_status
+  {
+    MCHECK_DISABLED = -1,       /* Consistency checking is not turned on.  */
+    MCHECK_OK,                  /* Block is fine.  */
+    MCHECK_FREE,                /* Block freed twice.  */
+    MCHECK_HEAD,                /* Memory before the block was clobbered.  */
+    MCHECK_TAIL                 /* Memory after the block was clobbered.  */
+  };
+
+/* Activate a standard collection of debugging hooks.  This must be called
+   before `malloc' is ever called.  ABORTFUNC is called with an error code
+   (see enum above) when an inconsistency is detected.  If ABORTFUNC is
+   null, the standard function prints on stderr and then calls `abort'.  */
+extern int mcheck __P ((void (*__abortfunc) __P ((enum mcheck_status))));
+
+/* Check for aberrations in a particular malloc'd block.  You must have
+   called `mcheck' already.  These are the same checks that `mcheck' does
+   when you free or reallocate a block.  */
+extern enum mcheck_status mprobe __P ((__ptr_t __ptr));
+
+/* Activate a standard collection of tracing hooks.  */
+extern void mtrace __P ((void));
+extern void muntrace __P ((void));
+
+/* Statistics available to the user.  */
+struct mstats
+  {
+    __malloc_size_t bytes_total; /* Total size of the heap. */
+    __malloc_size_t chunks_used; /* Chunks allocated by the user. */
+    __malloc_size_t bytes_used; /* Byte total of user-allocated chunks. */
+    __malloc_size_t chunks_free; /* Chunks in the free list. */
+    __malloc_size_t bytes_free; /* Byte total of chunks in the free list. */
+  };
+
+/* Pick up the current statistics. */
+extern struct mstats mstats __P ((void));
+
+/* Call WARNFUN with a warning message when memory usage is high.  */
+extern void memory_warnings __P ((__ptr_t __start,
+                                  void (*__warnfun) __P ((const char *))));
+
+
+/* Relocating allocator.  */
+
+/* Allocate SIZE bytes, and store the address in *HANDLEPTR.  */
+extern __ptr_t r_alloc __P ((__ptr_t *__handleptr, __malloc_size_t __size));
+
+/* Free the storage allocated in HANDLEPTR.  */
+extern void r_alloc_free __P ((__ptr_t *__handleptr));
+
+/* Adjust the block at HANDLEPTR to be SIZE bytes long.  */
+extern __ptr_t r_re_alloc __P ((__ptr_t *__handleptr, __malloc_size_t __size));
+
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif /* malloc.h  */
+/* Memory allocator `malloc'.
+   Copyright 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+                  Written May 1989 by Mike Haertel.
+
+This 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.
+
+This 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 this library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, 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.  */
+
+#ifndef _MALLOC_INTERNAL
+#define _MALLOC_INTERNAL
+#include <malloc.h>
+#endif
+#include <errno.h>
+
+/* How to really get more memory.  */
+__ptr_t (*__morecore) __P ((ptrdiff_t __size)) = __default_morecore;
+
+/* Debugging hook for `malloc'.  */
+__ptr_t (*__malloc_hook) __P ((__malloc_size_t __size));
+
+/* Pointer to the base of the first block.  */
+char *_heapbase;
+
+/* Block information table.  Allocated with align/__free (not malloc/free).  */
+malloc_info *_heapinfo;
+
+/* Number of info entries.  */
+static __malloc_size_t heapsize;
+
+/* Search index in the info table.  */
+__malloc_size_t _heapindex;
+
+/* Limit of valid info table indices.  */
+__malloc_size_t _heaplimit;
+
+/* Free lists for each fragment size.  */
+struct list _fraghead[BLOCKLOG];
+
+/* Instrumentation.  */
+__malloc_size_t _chunks_used;
+__malloc_size_t _bytes_used;
+__malloc_size_t _chunks_free;
+__malloc_size_t _bytes_free;
+
+/* Are you experienced?  */
+int __malloc_initialized;
+
+__malloc_size_t __malloc_extra_blocks;
+
+void (*__malloc_initialize_hook) __P ((void));
+void (*__after_morecore_hook) __P ((void));
+
+
+/* Aligned allocation.  */
+static __ptr_t align __P ((__malloc_size_t));
+static __ptr_t
+align (size)
+     __malloc_size_t size;
+{
+  __ptr_t result;
+  unsigned long int adj;
+
+  result = (*__morecore) (size);
+  adj = (unsigned long int) ((unsigned long int) ((char *) result -
+                                                  (char *) NULL)) % BLOCKSIZE;
+  if (adj != 0)
+    {
+      __ptr_t new;
+      adj = BLOCKSIZE - adj;
+      new = (*__morecore) (adj);
+      result = (char *) result + adj;
+    }
+
+  if (__after_morecore_hook)
+    (*__after_morecore_hook) ();
+
+  return result;
+}
+
+/* Get SIZE bytes, if we can get them starting at END.
+   Return the address of the space we got.
+   If we cannot get space at END, fail and return 0.  */
+static __ptr_t get_contiguous_space __P ((__malloc_ptrdiff_t, __ptr_t));
+static __ptr_t
+get_contiguous_space (size, position)
+     __malloc_ptrdiff_t size;
+     __ptr_t position;
+{
+  __ptr_t before;
+  __ptr_t after;
+
+  before = (*__morecore) (0);
+  /* If we can tell in advance that the break is at the wrong place,
+     fail now.  */
+  if (before != position)
+    return 0;
+
+  /* Allocate SIZE bytes and get the address of them.  */
+  after = (*__morecore) (size);
+  if (!after)
+    return 0;
+
+  /* It was not contiguous--reject it.  */
+  if (after != position)
+    {
+      (*__morecore) (- size);
+      return 0;
+    }
+
+  return after;
+}
+
+
+/* This is called when `_heapinfo' and `heapsize' have just
+   been set to describe a new info table.  Set up the table
+   to describe itself and account for it in the statistics.  */
+static void register_heapinfo __P ((void));
+#ifdef __GNUC__
+__inline__
+#endif
+static void
+register_heapinfo ()
+{
+  __malloc_size_t block, blocks;
+
+  block = BLOCK (_heapinfo);
+  blocks = BLOCKIFY (heapsize * sizeof (malloc_info));
+
+  /* Account for the _heapinfo block itself in the statistics.  */
+  _bytes_used += blocks * BLOCKSIZE;
+  ++_chunks_used;
+
+  /* Describe the heapinfo block itself in the heapinfo.  */
+  _heapinfo[block].busy.type = 0;
+  _heapinfo[block].busy.info.size = blocks;
+  /* Leave back-pointers for malloc_find_address.  */
+  while (--blocks > 0)
+    _heapinfo[block + blocks].busy.info.size = -blocks;
+}
+
+/* Set everything up and remember that we have.  */
+int
+__malloc_initialize ()
+{
+  if (__malloc_initialized)
+    return 0;
+
+  if (__malloc_initialize_hook)
+    (*__malloc_initialize_hook) ();
+
+  heapsize = HEAP / BLOCKSIZE;
+  _heapinfo = (malloc_info *) align (heapsize * sizeof (malloc_info));
+  if (_heapinfo == NULL)
+    return 0;
+  memset (_heapinfo, 0, heapsize * sizeof (malloc_info));
+  _heapinfo[0].free.size = 0;
+  _heapinfo[0].free.next = _heapinfo[0].free.prev = 0;
+  _heapindex = 0;
+  _heapbase = (char *) _heapinfo;
+  _heaplimit = BLOCK (_heapbase + heapsize * sizeof (malloc_info));
+
+  register_heapinfo ();
+
+  __malloc_initialized = 1;
+  return 1;
+}
+
+static int morecore_recursing;
+
+/* Get neatly aligned memory, initializing or
+   growing the heap info table as necessary. */
+static __ptr_t morecore __P ((__malloc_size_t));
+static __ptr_t
+morecore (size)
+     __malloc_size_t size;
+{
+  __ptr_t result;
+  malloc_info *newinfo, *oldinfo;
+  __malloc_size_t newsize;
+
+  if (morecore_recursing)
+    /* Avoid recursion.  The caller will know how to handle a null return.  */
+    return NULL;
+
+  result = align (size);
+  if (result == NULL)
+    return NULL;
+
+  /* Check if we need to grow the info table.  */
+  if ((__malloc_size_t) BLOCK ((char *) result + size) > heapsize)
+    {
+      /* Calculate the new _heapinfo table size.  We do not account for the
+         added blocks in the table itself, as we hope to place them in
+         existing free space, which is already covered by part of the
+         existing table.  */
+      newsize = heapsize;
+      do
+        newsize *= 2;
+      while ((__malloc_size_t) BLOCK ((char *) result + size) > newsize);
+
+      /* We must not reuse existing core for the new info table when called
+         from realloc in the case of growing a large block, because the
+         block being grown is momentarily marked as free.  In this case
+         _heaplimit is zero so we know not to reuse space for internal
+         allocation.  */
+      if (_heaplimit != 0)
+        {
+          /* First try to allocate the new info table in core we already
+             have, in the usual way using realloc.  If realloc cannot
+             extend it in place or relocate it to existing sufficient core,
+             we will get called again, and the code above will notice the
+             `morecore_recursing' flag and return null.  */
+          int save = errno;     /* Don't want to clobber errno with ENOMEM.  */
+          morecore_recursing = 1;
+          newinfo = (malloc_info *) _realloc_internal
+            (_heapinfo, newsize * sizeof (malloc_info));
+          morecore_recursing = 0;
+          if (newinfo == NULL)
+            errno = save;
+          else
+            {
+              /* We found some space in core, and realloc has put the old
+                 table's blocks on the free list.  Now zero the new part
+                 of the table and install the new table location.  */
+              memset (&newinfo[heapsize], 0,
+                      (newsize - heapsize) * sizeof (malloc_info));
+              _heapinfo = newinfo;
+              heapsize = newsize;
+              goto got_heap;
+            }
+        }
+
+      /* Allocate new space for the malloc info table.  */
+      while (1)
+        {
+          newinfo = (malloc_info *) align (newsize * sizeof (malloc_info));
+
+          /* Did it fail?  */
+          if (newinfo == NULL)
+            {
+              (*__morecore) (-size);
+              return NULL;
+            }
+
+          /* Is it big enough to record status for its own space?
+             If so, we win.  */
+          if ((__malloc_size_t) BLOCK ((char *) newinfo
+                                       + newsize * sizeof (malloc_info))
+              < newsize)
+            break;
+
+          /* Must try again.  First give back most of what we just got.  */
+          (*__morecore) (- newsize * sizeof (malloc_info));
+          newsize *= 2;
+        }
+
+      /* Copy the old table to the beginning of the new,
+         and zero the rest of the new table.  */
+      memcpy (newinfo, _heapinfo, heapsize * sizeof (malloc_info));
+      memset (&newinfo[heapsize], 0,
+              (newsize - heapsize) * sizeof (malloc_info));
+      oldinfo = _heapinfo;
+      _heapinfo = newinfo;
+      heapsize = newsize;
+
+      register_heapinfo ();
+
+      /* Reset _heaplimit so _free_internal never decides
+         it can relocate or resize the info table.  */
+      _heaplimit = 0;
+      _free_internal (oldinfo);
+
+      /* The new heap limit includes the new table just allocated.  */
+      _heaplimit = BLOCK ((char *) newinfo + heapsize * sizeof (malloc_info));
+      return result;
+    }
+
+ got_heap:
+  _heaplimit = BLOCK ((char *) result + size);
+  return result;
+}
+
+/* Allocate memory from the heap.  */
+__ptr_t
+_malloc_internal (size)
+     __malloc_size_t size;
+{
+  __ptr_t result;
+  __malloc_size_t block, blocks, lastblocks, start;
+  register __malloc_size_t i;
+  struct list *next;
+
+  /* ANSI C allows `malloc (0)' to either return NULL, or to return a
+     valid address you can realloc and free (though not dereference).
+
+     It turns out that some extant code (sunrpc, at least Ultrix's version)
+     expects `malloc (0)' to return non-NULL and breaks otherwise.
+     Be compatible.  */
+
+#if     0
+  if (size == 0)
+    return NULL;
+#endif
+
+  if (size < sizeof (struct list))
+    size = sizeof (struct list);
+
+#ifdef SUNOS_LOCALTIME_BUG
+  if (size < 16)
+    size = 16;
+#endif
+
+  /* Determine the allocation policy based on the request size.  */
+  if (size <= BLOCKSIZE / 2)
+    {
+      /* Small allocation to receive a fragment of a block.
+         Determine the logarithm to base two of the fragment size. */
+      register __malloc_size_t log = 1;
+      --size;
+      while ((size /= 2) != 0)
+        ++log;
+
+      /* Look in the fragment lists for a
+         free fragment of the desired size. */
+      next = _fraghead[log].next;
+      if (next != NULL)
+        {
+          /* There are free fragments of this size.
+             Pop a fragment out of the fragment list and return it.
+             Update the block's nfree and first counters. */
+          result = (__ptr_t) next;
+          next->prev->next = next->next;
+          if (next->next != NULL)
+            next->next->prev = next->prev;
+          block = BLOCK (result);
+          if (--_heapinfo[block].busy.info.frag.nfree != 0)
+            _heapinfo[block].busy.info.frag.first = (unsigned long int)
+              ((unsigned long int) ((char *) next->next - (char *) NULL)
+               % BLOCKSIZE) >> log;
+
+          /* Update the statistics.  */
+          ++_chunks_used;
+          _bytes_used += 1 << log;
+          --_chunks_free;
+          _bytes_free -= 1 << log;
+        }
+      else
+        {
+          /* No free fragments of the desired size, so get a new block
+             and break it into fragments, returning the first.  */
+          result = malloc (BLOCKSIZE);
+          if (result == NULL)
+            return NULL;
+
+          /* Link all fragments but the first into the free list.  */
+          next = (struct list *) ((char *) result + (1 << log));
+          next->next = NULL;
+          next->prev = &_fraghead[log];
+          _fraghead[log].next = next;
+
+          for (i = 2; i < (__malloc_size_t) (BLOCKSIZE >> log); ++i)
+            {
+              next = (struct list *) ((char *) result + (i << log));
+              next->next = _fraghead[log].next;
+              next->prev = &_fraghead[log];
+              next->prev->next = next;
+              next->next->prev = next;
+            }
+
+          /* Initialize the nfree and first counters for this block.  */
+          block = BLOCK (result);
+          _heapinfo[block].busy.type = log;
+          _heapinfo[block].busy.info.frag.nfree = i - 1;
+          _heapinfo[block].busy.info.frag.first = i - 1;
+
+          _chunks_free += (BLOCKSIZE >> log) - 1;
+          _bytes_free += BLOCKSIZE - (1 << log);
+          _bytes_used -= BLOCKSIZE - (1 << log);
+        }
+    }
+  else
+    {
+      /* Large allocation to receive one or more blocks.
+         Search the free list in a circle starting at the last place visited.
+         If we loop completely around without finding a large enough
+         space we will have to get more memory from the system.  */
+      blocks = BLOCKIFY (size);
+      start = block = _heapindex;
+      while (_heapinfo[block].free.size < blocks)
+        {
+          block = _heapinfo[block].free.next;
+          if (block == start)
+            {
+              /* Need to get more from the system.  Get a little extra.  */
+              __malloc_size_t wantblocks = blocks + __malloc_extra_blocks;
+              block = _heapinfo[0].free.prev;
+              lastblocks = _heapinfo[block].free.size;
+              /* Check to see if the new core will be contiguous with the
+                 final free block; if so we don't need to get as much.  */
+              if (_heaplimit != 0 && block + lastblocks == _heaplimit &&
+                  /* We can't do this if we will have to make the heap info
+                     table bigger to accomodate the new space.  */
+                  block + wantblocks <= heapsize &&
+                  get_contiguous_space ((wantblocks - lastblocks) * BLOCKSIZE,
+                                        ADDRESS (block + lastblocks)))
+                {
+                  /* We got it contiguously.  Which block we are extending
+                     (the `final free block' referred to above) might have
+                     changed, if it got combined with a freed info table.  */
+                  block = _heapinfo[0].free.prev;
+                  _heapinfo[block].free.size += (wantblocks - lastblocks);
+                  _bytes_free += (wantblocks - lastblocks) * BLOCKSIZE;
+                  _heaplimit += wantblocks - lastblocks;
+                  continue;
+                }
+              result = morecore (wantblocks * BLOCKSIZE);
+              if (result == NULL)
+                return NULL;
+              block = BLOCK (result);
+              /* Put the new block at the end of the free list.  */
+              _heapinfo[block].free.size = wantblocks;
+              _heapinfo[block].free.prev = _heapinfo[0].free.prev;
+              _heapinfo[block].free.next = 0;
+              _heapinfo[0].free.prev = block;
+              _heapinfo[_heapinfo[block].free.prev].free.next = block;
+              ++_chunks_free;
+              /* Now loop to use some of that block for this allocation.  */
+            }
+        }
+
+      /* At this point we have found a suitable free list entry.
+         Figure out how to remove what we need from the list. */
+      result = ADDRESS (block);
+      if (_heapinfo[block].free.size > blocks)
+        {
+          /* The block we found has a bit left over,
+             so relink the tail end back into the free list. */
+          _heapinfo[block + blocks].free.size
+            = _heapinfo[block].free.size - blocks;
+          _heapinfo[block + blocks].free.next
+            = _heapinfo[block].free.next;
+          _heapinfo[block + blocks].free.prev
+            = _heapinfo[block].free.prev;
+          _heapinfo[_heapinfo[block].free.prev].free.next
+            = _heapinfo[_heapinfo[block].free.next].free.prev
+            = _heapindex = block + blocks;
+        }
+      else
+        {
+          /* The block exactly matches our requirements,
+             so just remove it from the list. */
+          _heapinfo[_heapinfo[block].free.next].free.prev
+            = _heapinfo[block].free.prev;
+          _heapinfo[_heapinfo[block].free.prev].free.next
+            = _heapindex = _heapinfo[block].free.next;
+          --_chunks_free;
+        }
+
+      _heapinfo[block].busy.type = 0;
+      _heapinfo[block].busy.info.size = blocks;
+      ++_chunks_used;
+      _bytes_used += blocks * BLOCKSIZE;
+      _bytes_free -= blocks * BLOCKSIZE;
+
+      /* Mark all the blocks of the object just allocated except for the
+         first with a negative number so you can find the first block by
+         adding that adjustment.  */
+      while (--blocks > 0)
+        _heapinfo[block + blocks].busy.info.size = -blocks;
+    }
+
+  return result;
+}
+
+__ptr_t
+malloc (size)
+     __malloc_size_t size;
+{
+  if (!__malloc_initialized && !__malloc_initialize ())
+    return NULL;
+
+  return (__malloc_hook != NULL ? *__malloc_hook : _malloc_internal) (size);
+}
+
+#ifndef _LIBC
+
+/* On some ANSI C systems, some libc functions call _malloc, _free
+   and _realloc.  Make them use the GNU functions.  */
+
+__ptr_t
+_malloc (size)
+     __malloc_size_t size;
+{
+  return malloc (size);
+}
+
+void
+_free (ptr)
+     __ptr_t ptr;
+{
+  free (ptr);
+}
+
+__ptr_t
+_realloc (ptr, size)
+     __ptr_t ptr;
+     __malloc_size_t size;
+{
+  return realloc (ptr, size);
+}
+
+#endif
+/* Free a block of memory allocated by `malloc'.
+   Copyright 1990, 1991, 1992, 1994, 1995 Free Software Foundation, Inc.
+                  Written May 1989 by Mike Haertel.
+
+This 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.
+
+This 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 this library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, 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.  */
+
+#ifndef _MALLOC_INTERNAL
+#define _MALLOC_INTERNAL
+#include <malloc.h>
+#endif
+
+
+/* Cope with systems lacking `memmove'.    */
+#ifndef memmove
+#if  (defined (MEMMOVE_MISSING) || \
+      !defined(_LIBC) && !defined(STDC_HEADERS) && !defined(USG))
+#ifdef emacs
+#undef  __malloc_safe_bcopy
+#define __malloc_safe_bcopy safe_bcopy
+#endif
+/* This function is defined in realloc.c.  */
+extern void __malloc_safe_bcopy __P ((__ptr_t, __ptr_t, __malloc_size_t));
+#define memmove(to, from, size) __malloc_safe_bcopy ((from), (to), (size))
+#endif
+#endif
+
+
+/* Debugging hook for free.  */
+void (*__free_hook) __P ((__ptr_t __ptr));
+
+/* List of blocks allocated by memalign.  */
+struct alignlist *_aligned_blocks = NULL;
+
+/* Return memory to the heap.
+   Like `free' but don't call a __free_hook if there is one.  */
+void
+_free_internal (ptr)
+     __ptr_t ptr;
+{
+  int type;
+  __malloc_size_t block, blocks;
+  register __malloc_size_t i;
+  struct list *prev, *next;
+  __ptr_t curbrk;
+  const __malloc_size_t lesscore_threshold
+    /* Threshold of free space at which we will return some to the system.  */
+    = FINAL_FREE_BLOCKS + 2 * __malloc_extra_blocks;
+
+  register struct alignlist *l;
+
+  if (ptr == NULL)
+    return;
+
+  for (l = _aligned_blocks; l != NULL; l = l->next)
+    if (l->aligned == ptr)
+      {
+        l->aligned = NULL;      /* Mark the slot in the list as free.  */
+        ptr = l->exact;
+        break;
+      }
+
+  block = BLOCK (ptr);
+
+  type = _heapinfo[block].busy.type;
+  switch (type)
+    {
+    case 0:
+      /* Get as many statistics as early as we can.  */
+      --_chunks_used;
+      _bytes_used -= _heapinfo[block].busy.info.size * BLOCKSIZE;
+      _bytes_free += _heapinfo[block].busy.info.size * BLOCKSIZE;
+
+      /* Find the free cluster previous to this one in the free list.
+         Start searching at the last block referenced; this may benefit
+         programs with locality of allocation.  */
+      i = _heapindex;
+      if (i > block)
+        while (i > block)
+          i = _heapinfo[i].free.prev;
+      else
+        {
+          do
+            i = _heapinfo[i].free.next;
+          while (i > 0 && i < block);
+          i = _heapinfo[i].free.prev;
+        }
+
+      /* Determine how to link this block into the free list.  */
+      if (block == i + _heapinfo[i].free.size)
+        {
+          /* Coalesce this block with its predecessor.  */
+          _heapinfo[i].free.size += _heapinfo[block].busy.info.size;
+          block = i;
+        }
+      else
+        {
+          /* Really link this block back into the free list.  */
+          _heapinfo[block].free.size = _heapinfo[block].busy.info.size;
+          _heapinfo[block].free.next = _heapinfo[i].free.next;
+          _heapinfo[block].free.prev = i;
+          _heapinfo[i].free.next = block;
+          _heapinfo[_heapinfo[block].free.next].free.prev = block;
+          ++_chunks_free;
+        }
+
+      /* Now that the block is linked in, see if we can coalesce it
+         with its successor (by deleting its successor from the list
+         and adding in its size).  */
+      if (block + _heapinfo[block].free.size == _heapinfo[block].free.next)
+        {
+          _heapinfo[block].free.size
+            += _heapinfo[_heapinfo[block].free.next].free.size;
+          _heapinfo[block].free.next
+            = _heapinfo[_heapinfo[block].free.next].free.next;
+          _heapinfo[_heapinfo[block].free.next].free.prev = block;
+          --_chunks_free;
+        }
+
+      /* How many trailing free blocks are there now?  */
+      blocks = _heapinfo[block].free.size;
+
+      /* Where is the current end of accessible core?  */
+      curbrk = (*__morecore) (0);
+
+      if (_heaplimit != 0 && curbrk == ADDRESS (_heaplimit))
+        {
+          /* The end of the malloc heap is at the end of accessible core.
+             It's possible that moving _heapinfo will allow us to
+             return some space to the system.  */
+
+          __malloc_size_t info_block = BLOCK (_heapinfo);
+          __malloc_size_t info_blocks = _heapinfo[info_block].busy.info.size;
+          __malloc_size_t prev_block = _heapinfo[block].free.prev;
+          __malloc_size_t prev_blocks = _heapinfo[prev_block].free.size;
+          __malloc_size_t next_block = _heapinfo[block].free.next;
+          __malloc_size_t next_blocks = _heapinfo[next_block].free.size;
+
+          if (/* Win if this block being freed is last in core, the info table
+                 is just before it, the previous free block is just before the
+                 info table, and the two free blocks together form a useful
+                 amount to return to the system.  */
+              (block + blocks == _heaplimit &&
+               info_block + info_blocks == block &&
+               prev_block != 0 && prev_block + prev_blocks == info_block &&
+               blocks + prev_blocks >= lesscore_threshold) ||
+              /* Nope, not the case.  We can also win if this block being
+                 freed is just before the info table, and the table extends
+                 to the end of core or is followed only by a free block,
+                 and the total free space is worth returning to the system.  */
+              (block + blocks == info_block &&
+               ((info_block + info_blocks == _heaplimit &&
+                 blocks >= lesscore_threshold) ||
+                (info_block + info_blocks == next_block &&
+                 next_block + next_blocks == _heaplimit &&
+                 blocks + next_blocks >= lesscore_threshold)))
+              )
+            {
+              malloc_info *newinfo;
+              __malloc_size_t oldlimit = _heaplimit;
+
+              /* Free the old info table, clearing _heaplimit to avoid
+                 recursion into this code.  We don't want to return the
+                 table's blocks to the system before we have copied them to
+                 the new location.  */
+              _heaplimit = 0;
+              _free_internal (_heapinfo);
+              _heaplimit = oldlimit;
+
+              /* Tell malloc to search from the beginning of the heap for
+                 free blocks, so it doesn't reuse the ones just freed.  */
+              _heapindex = 0;
+
+              /* Allocate new space for the info table and move its data.  */
+              newinfo = (malloc_info *) _malloc_internal (info_blocks
+                                                          * BLOCKSIZE);
+              memmove (newinfo, _heapinfo, info_blocks * BLOCKSIZE);
+              _heapinfo = newinfo;
+
+              /* We should now have coalesced the free block with the
+                 blocks freed from the old info table.  Examine the entire
+                 trailing free block to decide below whether to return some
+                 to the system.  */
+              block = _heapinfo[0].free.prev;
+              blocks = _heapinfo[block].free.size;
+            }
+
+          /* Now see if we can return stuff to the system.  */
+          if (block + blocks == _heaplimit && blocks >= lesscore_threshold)
+            {
+              register __malloc_size_t bytes = blocks * BLOCKSIZE;
+              _heaplimit -= blocks;
+              (*__morecore) (-bytes);
+              _heapinfo[_heapinfo[block].free.prev].free.next
+                = _heapinfo[block].free.next;
+              _heapinfo[_heapinfo[block].free.next].free.prev
+                = _heapinfo[block].free.prev;
+              block = _heapinfo[block].free.prev;
+              --_chunks_free;
+              _bytes_free -= bytes;
+            }
+        }
+
+      /* Set the next search to begin at this block.  */
+      _heapindex = block;
+      break;
+
+    default:
+      /* Do some of the statistics.  */
+      --_chunks_used;
+      _bytes_used -= 1 << type;
+      ++_chunks_free;
+      _bytes_free += 1 << type;
+
+      /* Get the address of the first free fragment in this block.  */
+      prev = (struct list *) ((char *) ADDRESS (block) +
+                              (_heapinfo[block].busy.info.frag.first << type));
+
+      if (_heapinfo[block].busy.info.frag.nfree == (BLOCKSIZE >> type) - 1)
+        {
+          /* If all fragments of this block are free, remove them
+             from the fragment list and free the whole block.  */
+          next = prev;
+          for (i = 1; i < (__malloc_size_t) (BLOCKSIZE >> type); ++i)
+            next = next->next;
+          prev->prev->next = next;
+          if (next != NULL)
+            next->prev = prev->prev;
+          _heapinfo[block].busy.type = 0;
+          _heapinfo[block].busy.info.size = 1;
+
+          /* Keep the statistics accurate.  */
+          ++_chunks_used;
+          _bytes_used += BLOCKSIZE;
+          _chunks_free -= BLOCKSIZE >> type;
+          _bytes_free -= BLOCKSIZE;
+
+          free (ADDRESS (block));
+        }
+      else if (_heapinfo[block].busy.info.frag.nfree != 0)
+        {
+          /* If some fragments of this block are free, link this
+             fragment into the fragment list after the first free
+             fragment of this block. */
+          next = (struct list *) ptr;
+          next->next = prev->next;
+          next->prev = prev;
+          prev->next = next;
+          if (next->next != NULL)
+            next->next->prev = next;
+          ++_heapinfo[block].busy.info.frag.nfree;
+        }
+      else
+        {
+          /* No fragments of this block are free, so link this
+             fragment into the fragment list and announce that
+             it is the first free fragment of this block. */
+          prev = (struct list *) ptr;
+          _heapinfo[block].busy.info.frag.nfree = 1;
+          _heapinfo[block].busy.info.frag.first = (unsigned long int)
+            ((unsigned long int) ((char *) ptr - (char *) NULL)
+             % BLOCKSIZE >> type);
+          prev->next = _fraghead[type].next;
+          prev->prev = &_fraghead[type];
+          prev->prev->next = prev;
+          if (prev->next != NULL)
+            prev->next->prev = prev;
+        }
+      break;
+    }
+}
+
+/* Return memory to the heap.  */
+void
+free (ptr)
+     __ptr_t ptr;
+{
+  if (__free_hook != NULL)
+    (*__free_hook) (ptr);
+  else
+    _free_internal (ptr);
+}
+
+/* Define the `cfree' alias for `free'.  */
+#ifdef weak_alias
+weak_alias (free, cfree)
+#else
+void
+cfree (ptr)
+     __ptr_t ptr;
+{
+  free (ptr);
+}
+#endif
+/* Change the size of a block allocated by `malloc'.
+   Copyright 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+                     Written May 1989 by Mike Haertel.
+
+This 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.
+
+This 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 this library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, 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.  */
+
+#ifndef _MALLOC_INTERNAL
+#define _MALLOC_INTERNAL
+#include <malloc.h>
+#endif
+
+
+
+/* Cope with systems lacking `memmove'.    */
+#if  (defined (MEMMOVE_MISSING) || \
+      !defined(_LIBC) && !defined(STDC_HEADERS) && !defined(USG))
+
+#ifdef emacs
+#undef  __malloc_safe_bcopy
+#define __malloc_safe_bcopy safe_bcopy
+#else
+
+/* Snarfed directly from Emacs src/dispnew.c:
+   XXX Should use system bcopy if it handles overlap.  */
+
+/* Like bcopy except never gets confused by overlap.  */
+
+void
+__malloc_safe_bcopy (afrom, ato, size)
+     __ptr_t afrom;
+     __ptr_t ato;
+     __malloc_size_t size;
+{
+  char *from = afrom, *to = ato;
+
+  if (size <= 0 || from == to)
+    return;
+
+  /* If the source and destination don't overlap, then bcopy can
+     handle it.  If they do overlap, but the destination is lower in
+     memory than the source, we'll assume bcopy can handle that.  */
+  if (to < from || from + size <= to)
+    bcopy (from, to, size);
+
+  /* Otherwise, we'll copy from the end.  */
+  else
+    {
+      register char *endf = from + size;
+      register char *endt = to + size;
+
+      /* If TO - FROM is large, then we should break the copy into
+         nonoverlapping chunks of TO - FROM bytes each.  However, if
+         TO - FROM is small, then the bcopy function call overhead
+         makes this not worth it.  The crossover point could be about
+         anywhere.  Since I don't think the obvious copy loop is too
+         bad, I'm trying to err in its favor.  */
+      if (to - from < 64)
+        {
+          do
+            *--endt = *--endf;
+          while (endf != from);
+        }
+      else
+        {
+          for (;;)
+            {
+              endt -= (to - from);
+              endf -= (to - from);
+
+              if (endt < to)
+                break;
+
+              bcopy (endf, endt, to - from);
+            }
+
+          /* If SIZE wasn't a multiple of TO - FROM, there will be a
+             little left over.  The amount left over is
+             (endt + (to - from)) - to, which is endt - from.  */
+          bcopy (from, to, endt - from);
+        }
+    }
+}
+#endif /* emacs */
+
+#ifndef memmove
+extern void __malloc_safe_bcopy __P ((__ptr_t, __ptr_t, __malloc_size_t));
+#define memmove(to, from, size) __malloc_safe_bcopy ((from), (to), (size))
+#endif
+
+#endif
+
+
+#define min(A, B) ((A) < (B) ? (A) : (B))
+
+/* Debugging hook for realloc.  */
+__ptr_t (*__realloc_hook) __P ((__ptr_t __ptr, __malloc_size_t __size));
+
+/* 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 free and malloc. */
+__ptr_t
+_realloc_internal (ptr, size)
+     __ptr_t ptr;
+     __malloc_size_t size;
+{
+  __ptr_t result;
+  int type;
+  __malloc_size_t block, blocks, oldlimit;
+
+  if (size == 0)
+    {
+      _free_internal (ptr);
+      return _malloc_internal (0);
+    }
+  else if (ptr == NULL)
+    return _malloc_internal (size);
+
+  block = BLOCK (ptr);
+
+  type = _heapinfo[block].busy.type;
+  switch (type)
+    {
+    case 0:
+      /* Maybe reallocate a large block to a small fragment.  */
+      if (size <= BLOCKSIZE / 2)
+        {
+          result = _malloc_internal (size);
+          if (result != NULL)
+            {
+              memcpy (result, ptr, size);
+              _free_internal (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 < _heapinfo[block].busy.info.size)
+        {
+          /* The new size is smaller; return
+             excess memory to the free list. */
+          _heapinfo[block + blocks].busy.type = 0;
+          _heapinfo[block + blocks].busy.info.size
+            = _heapinfo[block].busy.info.size - blocks;
+          _heapinfo[block].busy.info.size = blocks;
+          /* We have just created a new chunk by splitting a chunk in two.
+             Now we will free this chunk; increment the statistics counter
+             so it doesn't become wrong when _free_internal decrements it.  */
+          ++_chunks_used;
+          _free_internal (ADDRESS (block + blocks));
+          result = ptr;
+        }
+      else if (blocks == _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 = _heapinfo[block].busy.info.size;
+          /* Prevent free from actually returning memory to the system.  */
+          oldlimit = _heaplimit;
+          _heaplimit = 0;
+          _free_internal (ptr);
+          result = _malloc_internal (size);
+          if (_heaplimit == 0)
+            _heaplimit = oldlimit;
+          if (result == NULL)
+            {
+              /* Now we're really in trouble.  We have to unfree
+                 the thing we just freed.  Unfortunately it might
+                 have been coalesced with its neighbors.  */
+              if (_heapindex == block)
+                (void) _malloc_internal (blocks * BLOCKSIZE);
+              else
+                {
+                  __ptr_t previous
+                    = _malloc_internal ((block - _heapindex) * BLOCKSIZE);
+                  (void) _malloc_internal (blocks * BLOCKSIZE);
+                  _free_internal (previous);
+                }
+              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 > (__malloc_size_t) (1 << (type - 1)) &&
+          size <= (__malloc_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 = _malloc_internal (size);
+          if (result == NULL)
+            return NULL;
+          memcpy (result, ptr, min (size, (__malloc_size_t) 1 << type));
+          _free_internal (ptr);
+        }
+      break;
+    }
+
+  return result;
+}
+
+__ptr_t
+realloc (ptr, size)
+     __ptr_t ptr;
+     __malloc_size_t size;
+{
+  if (!__malloc_initialized && !__malloc_initialize ())
+    return NULL;
+
+  return (__realloc_hook != NULL ? *__realloc_hook : _realloc_internal)
+    (ptr, size);
+}
+/* Copyright (C) 1991, 1992, 1994 Free Software Foundation, Inc.
+
+This 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.
+
+This 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 this library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, 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.  */
+
+#ifndef _MALLOC_INTERNAL
+#define _MALLOC_INTERNAL
+#include <malloc.h>
+#endif
+
+/* Allocate an array of NMEMB elements each SIZE bytes long.
+   The entire array is initialized to zeros.  */
+__ptr_t
+calloc (nmemb, size)
+     register __malloc_size_t nmemb;
+     register __malloc_size_t size;
+{
+  register __ptr_t result = malloc (nmemb * size);
+
+  if (result != NULL)
+    (void) memset (result, 0, nmemb * size);
+
+  return result;
+}
+/* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with the GNU C Library; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#ifndef _MALLOC_INTERNAL
+#define _MALLOC_INTERNAL
+#include <malloc.h>
+#endif
+
+#ifndef __GNU_LIBRARY__
+#define __sbrk  sbrk
+#endif
+
+#ifdef __GNU_LIBRARY__
+/* It is best not to declare this and cast its result on foreign operating
+   systems with potentially hostile include files.  */
+
+#include <stddef.h>
+extern __ptr_t __sbrk __P ((ptrdiff_t increment));
+#endif
+
+#ifndef NULL
+#define NULL 0
+#endif
+
+/* Allocate INCREMENT more bytes of data space,
+   and return the start of data space, or NULL on errors.
+   If INCREMENT is negative, shrink data space.  */
+__ptr_t
+__default_morecore (increment)
+     __malloc_ptrdiff_t increment;
+{
+  __ptr_t result = (__ptr_t) __sbrk (increment);
+  if (result == (__ptr_t) -1)
+    return NULL;
+  return result;
+}
+/* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
+
+This 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.
+
+This 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 this library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#ifndef _MALLOC_INTERNAL
+#define _MALLOC_INTERNAL
+#include <malloc.h>
+#endif
+
+#if __DJGPP__ - 0 == 1
+
+/* There is some problem with memalign in DJGPP v1 and we are supposed
+   to omit it.  Noone told me why, they just told me to do it.  */
+
+#else
+
+__ptr_t (*__memalign_hook) __P ((size_t __size, size_t __alignment));
+
+__ptr_t
+memalign (alignment, size)
+     __malloc_size_t alignment;
+     __malloc_size_t size;
+{
+  __ptr_t result;
+  unsigned long int adj, lastadj;
+
+  if (__memalign_hook)
+    return (*__memalign_hook) (alignment, size);
+
+  /* Allocate a block with enough extra space to pad the block with up to
+     (ALIGNMENT - 1) bytes if necessary.  */
+  result = malloc (size + alignment - 1);
+  if (result == NULL)
+    return NULL;
+
+  /* Figure out how much we will need to pad this particular block
+     to achieve the required alignment.  */
+  adj = (unsigned long int) ((char *) result - (char *) NULL) % alignment;
+
+  do
+    {
+      /* Reallocate the block with only as much excess as it needs.  */
+      free (result);
+      result = malloc (adj + size);
+      if (result == NULL)       /* Impossible unless interrupted.  */
+        return NULL;
+
+      lastadj = adj;
+      adj = (unsigned long int) ((char *) result - (char *) NULL) % alignment;
+      /* It's conceivable we might have been so unlucky as to get a
+         different block with weaker alignment.  If so, this block is too
+         short to contain SIZE after alignment correction.  So we must
+         try again and get another block, slightly larger.  */
+    } while (adj > lastadj);
+
+  if (adj != 0)
+    {
+      /* Record this block in the list of aligned blocks, so that `free'
+         can identify the pointer it is passed, which will be in the middle
+         of an allocated block.  */
+
+      struct alignlist *l;
+      for (l = _aligned_blocks; l != NULL; l = l->next)
+        if (l->aligned == NULL)
+          /* This slot is free.  Use it.  */
+          break;
+      if (l == NULL)
+        {
+          l = (struct alignlist *) malloc (sizeof (struct alignlist));
+          if (l == NULL)
+            {
+              free (result);
+              return NULL;
+            }
+          l->next = _aligned_blocks;
+          _aligned_blocks = l;
+        }
+      l->exact = result;
+      result = l->aligned = (char *) result + alignment - adj;
+    }
+
+  return result;
+}
+
+#endif /* Not DJGPP v1 */
+/* Allocate memory on a page boundary.
+   Copyright (C) 1991, 92, 93, 94, 96 Free Software Foundation, Inc.
+
+This 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.
+
+This 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 this library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, 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.  */
+
+#if defined (_MALLOC_INTERNAL) && defined (GMALLOC_INHIBIT_VALLOC)
+
+/* Emacs defines GMALLOC_INHIBIT_VALLOC to avoid this definition
+   on MSDOS, where it conflicts with a system header file.  */
+
+#define ELIDE_VALLOC
+
+#endif
+
+#ifndef ELIDE_VALLOC
+
+#if defined (__GNU_LIBRARY__) || defined (_LIBC)
+#include <stddef.h>
+#include <sys/cdefs.h>
+extern size_t __getpagesize __P ((void));
+#else
+#include "getpagesize.h"
+#define  __getpagesize()        getpagesize()
+#endif
+
+#ifndef _MALLOC_INTERNAL
+#define _MALLOC_INTERNAL
+#include <malloc.h>
+#endif
+
+static __malloc_size_t pagesize;
+
+__ptr_t
+valloc (size)
+     __malloc_size_t size;
+{
+  if (pagesize == 0)
+    pagesize = __getpagesize ();
+
+  return memalign (pagesize, size);
+}
+
+#endif  /* Not ELIDE_VALLOC.  */