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1.1       root        1: /* alloc.h
                      2:    Header file for uuconf memory allocation routines.
                      3: 
                      4:    Copyright (C) 1992 Ian Lance Taylor
                      5: 
                      6:    This file is part of the Taylor UUCP uuconf library.
                      7: 
                      8:    This library is free software; you can redistribute it and/or
                      9:    modify it under the terms of the GNU Library General Public License
                     10:    as published by the Free Software Foundation; either version 2 of
                     11:    the License, or (at your option) any later version.
                     12: 
                     13:    This library is distributed in the hope that it will be useful, but
                     14:    WITHOUT ANY WARRANTY; without even the implied warranty of
                     15:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
                     16:    Library General Public License for more details.
                     17: 
                     18:    You should have received a copy of the GNU Library General Public
                     19:    License along with this library; if not, write to the Free Software
                     20:    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
                     21: 
                     22:    The author of the program may be contacted at [email protected] or
                     23:    c/o Infinity Development Systems, P.O. Box 520, Waltham, MA 02254.
                     24:    */
                     25: 
                     26: /* This header file is private to the uuconf memory allocation
                     27:    routines, and should not be included by any other files.  */
                     28: 
                     29: /* We want to be able to keep track of allocated memory blocks, so
                     30:    that we can free them up later.  This will let us free up all the
                     31:    memory allocated to hold information for a system, for example.  We
                     32:    do this by allocating large chunks and doling them out.  Calling
                     33:    uuconf_malloc_block will return a pointer to a magic cookie which
                     34:    can then be passed to uuconf_malloc and uuconf_free.  Passing the
                     35:    pointer to uuconf_free_block will free all memory allocated for
                     36:    that block.  */
                     37: 
                     38: /* We allocate this much space in each block.  On most systems, this
                     39:    will make the actual structure 1024 bytes, which may be convenient
                     40:    for some types of memory allocators.  */
                     41: #define CALLOC_SIZE (1008)
                     42: 
                     43: /* This is the actual structure of a block.  */
                     44: struct sblock
                     45: {
                     46:   /* Next block in linked list.  */
                     47:   struct sblock *qnext;
                     48:   /* Index of next free spot.  */
                     49:   size_t ifree;
                     50:   /* Last value returned by uuconf_malloc for this block.  */
                     51:   pointer plast;
                     52:   /* List of additional memory blocks.  */
                     53:   struct sadded *qadded;
                     54:   /* Buffer of data.  We put it in a union with a double to make sure
                     55:      it is adequately aligned.  */
                     56:   union
                     57:     {
                     58:       char ab[CALLOC_SIZE];
                     59:       double l;
                     60:     } u;
                     61: };
                     62: 
                     63: /* There is a linked list of additional memory blocks inserted by
                     64:    uuconf_add_block.  */
                     65: struct sadded
                     66: {
                     67:   /* The next in the list.  */
                     68:   struct sadded *qnext;
                     69:   /* The added block.  */
                     70:   pointer padded;
                     71: };

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