1993-08-05 18:28:27 +00:00
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/* alloc.h
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Header file for uuconf memory allocation routines.
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Copyright (C) 1992 Ian Lance Taylor
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This file is part of the Taylor UUCP uuconf library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License
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as published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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The author of the program may be contacted at ian@airs.com or
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1994-05-07 18:14:43 +00:00
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c/o Cygnus Support, Building 200, 1 Kendall Square, Cambridge, MA 02139.
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1993-08-05 18:28:27 +00:00
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*/
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/* This header file is private to the uuconf memory allocation
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routines, and should not be included by any other files. */
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/* We want to be able to keep track of allocated memory blocks, so
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that we can free them up later. This will let us free up all the
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memory allocated to hold information for a system, for example. We
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do this by allocating large chunks and doling them out. Calling
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uuconf_malloc_block will return a pointer to a magic cookie which
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can then be passed to uuconf_malloc and uuconf_free. Passing the
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pointer to uuconf_free_block will free all memory allocated for
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that block. */
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/* We allocate this much space in each block. On most systems, this
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will make the actual structure 1024 bytes, which may be convenient
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for some types of memory allocators. */
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#define CALLOC_SIZE (1008)
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/* This is the actual structure of a block. */
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struct sblock
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{
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/* Next block in linked list. */
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struct sblock *qnext;
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/* Index of next free spot. */
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size_t ifree;
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/* Last value returned by uuconf_malloc for this block. */
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pointer plast;
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/* List of additional memory blocks. */
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struct sadded *qadded;
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/* Buffer of data. We put it in a union with a double to make sure
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it is adequately aligned. */
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union
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{
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char ab[CALLOC_SIZE];
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double l;
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} u;
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};
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/* There is a linked list of additional memory blocks inserted by
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uuconf_add_block. */
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struct sadded
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{
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/* The next in the list. */
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struct sadded *qnext;
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/* The added block. */
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pointer padded;
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};
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