mdw@git.distorted.org.uk Git - mLib/blob - sub.h

   1 /* -*-c-*-
   2  *
   3  * $Id: sub.h,v 1.3 1999/05/06 19:51:35 mdw Exp $
   4  *
   5  * Allocation of known-size blocks
   6  *
   7  * (c) 1998 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of the mLib utilities library.
  13  *
  14  * mLib is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU Library General Public License as
  16  * published by the Free Software Foundation; either version 2 of the
  17  * License, or (at your option) any later version.
  18  *
  19  * mLib is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Library General Public
  25  * License along with mLib; if not, write to the Free
  26  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 /*----- Revision history --------------------------------------------------*
  31  *
  32  * $Log: sub.h,v $
  33  * Revision 1.3  1999/05/06 19:51:35  mdw
  34  * Reformatted the LGPL notice a little bit.
  35  *
  36  * Revision 1.2  1999/05/05 18:50:31  mdw
  37  * Change licensing conditions to LGPL.
  38  *
  39  * Revision 1.1.1.1  1998/06/17 23:44:42  mdw
  40  * Initial version of mLib
  41  *
  42  */
  43
  44 #ifndef SUB_H
  45 #define SUB_H
  46
  47 #ifdef __cplusplus
  48   extern "C" {
  49 #endif
  50
  51 /*----- Required header files ---------------------------------------------*/
  52
  53 #include <stdlib.h>
  54
  55 #ifndef ALLOC_H
  56 #  include "alloc.h"
  57 #endif
  58
  59 /*----- Functions provided ------------------------------------------------*/
  60
  61 /* --- @sub_alloc@ --- *
  62  *
  63  * Arguments:   @size_t s@ = size of chunk wanted
  64  *
  65  * Returns:     Pointer to a block at least as large as the one wanted.
  66  *
  67  * Use:         Allocates a small block of memory.  If there is no more
  68  *              memory left, the exception @EXC_NOMEM@ is raised.
  69  */
  70
  71 #ifdef TRACK_ENABLE
  72 #  define sub_alloc(s) xmalloc(s)
  73 #else
  74 void *sub_alloc(size_t s);
  75 #endif
  76
  77 /* --- @sub_free@ --- *
  78  *
  79  * Arguments:   @void *p@ = address of block to free
  80  *              @size_t s@ = size of block
  81  *
  82  * Returns:     ---
  83  *
  84  * Use:         Frees a block allocated by @sub_alloc@.
  85  */
  86
  87 #ifdef TRACK_ENABLE
  88 #  define sub_free(p, s) free(p)
  89 #else
  90 void sub_free(void *p, size_t s);
  91 #endif
  92
  93 /* --- @CREATE@ --- *
  94  *
  95  * Arguments:   @type@ = type of object required; must be passable to
  96  *                      @sizeof@
  97  *
  98  * Returns:     Pointer to a block sufficiently big to hold an object of the
  99  *              named type.
 100  *
 101  * Use:         Allocates a block of the required type.
 102  */
 103
 104 #define CREATE(type) sub_alloc(sizeof(type))
 105
 106 /* --- @DESTROY@ --- *
 107  *
 108  * Arguments:   @void *p@ = pointer to an object
 109  *
 110  * Returns:     ---
 111  *
 112  * Use:         Frees the thing pointed to by @p@.
 113  */
 114
 115 #define DESTROY(p) sub_free(p, sizeof(*p))
 116
 117 /* --- @sub_init@ --- *
 118  *
 119  * Arguments:   ---
 120  *
 121  * Returns:     ---
 122  *
 123  * Use:         Initialises the magic allocator.
 124  */
 125
 126 void sub_init(void);
 127
 128 /*----- That's all, folks -------------------------------------------------*/
 129
 130 #ifdef __cplusplus
 131   }
 132 #endif
 133
 134 #endif