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

   1 /* -*-c-*-
   2  *
   3  * $Id: alloc.h,v 1.7 2004/04/08 01:36:11 mdw Exp $
   4  *
   5  * Memory allocation functions
   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 #ifndef MLIB_ALLOC_H
  31 #define MLIB_ALLOC_H
  32
  33 #ifdef __cplusplus
  34   extern "C" {
  35 #endif
  36
  37 /*----- Required header files ---------------------------------------------*/
  38
  39 #include <stddef.h>
  40
  41 #ifndef MLIB_ARENA_H
  42 #  include "arena.h"
  43 #endif
  44
  45 /*----- Functions and macros ----------------------------------------------*/
  46
  47 /* --- @x_alloc@ --- *
  48  *
  49  * Arguments:   @arena *a@ = pointer to underlying arena
  50  *              @size_t sz@ = size of block to allocate
  51  *
  52  * Returns:     Pointer to allocated block.
  53  *
  54  * Use:         Allocates memory.  If there's not enough memory, the
  55  *              exception @EXC_NOMEM@ is thrown.
  56  */
  57
  58 extern void *x_alloc(arena */*a*/, size_t /*sz*/);
  59
  60 /* --- @x_strdup@ --- *
  61  *
  62  * Arguments:   @arena *a@ = pointer to underlying arena
  63  *              @const char *s@ = pointer to a string
  64  *
  65  * Returns:     Pointer to a copy of the string.
  66  *
  67  * Use:         Copies a string (like @strdup@ would, if it existed).  If
  68  *              there's not enough memory, the exception @EXC_NOMEM@ is
  69  *              thrown.
  70  */
  71
  72 extern char *x_strdup(arena */*a*/, const char */*s*/);
  73
  74 /* --- @x_realloc@ --- *
  75  *
  76  * Arguments:   @arena *a@ = pointer to underlying arena
  77  *              @void *p@ = pointer to a block of memory
  78  *              @size_t sz@ = new size desired for the block
  79  *              @size_t osz@ = size of the old block
  80  *
  81  * Returns:     Pointer to the resized memory block (which is almost
  82  *              certainly not in the same place any more).
  83  *
  84  * Use:         Resizes a memory block.  If there's not enough memory, the
  85  *              exception @EXC_NOMEM@ is thrown.
  86  */
  87
  88 extern void *x_realloc(arena */*a*/, void */*p*/,
  89                        size_t /*sz*/, size_t /*osz*/);
  90
  91 /* --- @x_free@ --- *
  92  *
  93  * Arguments:   @arena *a@ = pointer to underlying arena
  94  *              @void *p@ = pointer to a block of memory.
  95  *
  96  * Returns:     ---
  97  *
  98  * Use:         Frees a block of memory.
  99  */
 100
 101 extern void x_free(arena */*a*/, void */*p*/);
 102 #define x_free(a, p) A_FREE(a, p)
 103
 104 /*----- Old functions for the standard arena ------------------------------*/
 105
 106 /* --- @xmalloc@ --- *
 107  *
 108  * Arguments:   @size_t sz@ = size of block to allocate
 109  *
 110  * Returns:     Pointer to allocated block.
 111  *
 112  * Use:         Allocates memory.  If there's not enough memory, the
 113  *              exception @EXC_NOMEM@ is thrown.
 114  */
 115
 116 extern void *xmalloc(size_t /*sz*/);
 117 #define xmalloc(sz) x_alloc(arena_global, (sz))
 118
 119 /* --- @xstrdup@ --- *
 120  *
 121  * Arguments:   @const char *s@ = pointer to a string
 122  *
 123  * Returns:     Pointer to a copy of the string.
 124  *
 125  * Use:         Copies a string (like @strdup@ would, if it existed).  If
 126  *              there's not enough memory, the exception @EXC_NOMEM@ is
 127  *              thrown.
 128  */
 129
 130 extern char *xstrdup(const char */*s*/);
 131 #define xstrdup(p) x_strdup(arena_global, (p))
 132
 133 /* --- @xrealloc@ --- *
 134  *
 135  * Arguments:   @void *p@ = pointer to a block of memory
 136  *              @size_t sz@ = new size desired for the block
 137  *              @size_t osz@ = size of the old block
 138  *
 139  * Returns:     Pointer to the resized memory block (which is almost
 140  *              certainly not in the same place any more).
 141  *
 142  * Use:         Resizes a memory block.  If there's not enough memory, the
 143  *              exception @EXC_NOMEM@ is thrown.
 144  */
 145
 146 extern void *xrealloc(void */*p*/, size_t /*sz*/, size_t /*osz*/);
 147 #define xrealloc(p, sz, osz) x_realloc(arena_global, (p), (sz), (osz))
 148
 149 /* --- @xfree@ --- *
 150  *
 151  * Arguments:   @void *p@ = pointer to a block of memory.
 152  *
 153  * Returns:     ---
 154  *
 155  * Use:         Frees a block of memory.
 156  */
 157
 158 extern void xfree(void */*p*/);
 159 #define xfree(p) x_free(arena_global, (p))
 160
 161 /*----- That's all, folks -------------------------------------------------*/
 162
 163 #ifdef __cplusplus
 164   }
 165 #endif
 166
 167 #endif