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

   1 /* -*-c-*-
   2  *
   3  * $Id: alloc.c,v 1.4 2000/06/17 10:35:51 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 /*----- Revision history --------------------------------------------------*
  31  *
  32  * $Log: alloc.c,v $
  33  * Revision 1.4  2000/06/17 10:35:51  mdw
  34  * Major overhaul for arena support.
  35  *
  36  * Revision 1.3  1999/05/06 19:51:35  mdw
  37  * Reformatted the LGPL notice a little bit.
  38  *
  39  * Revision 1.2  1999/05/05 18:50:31  mdw
  40  * Change licensing conditions to LGPL.
  41  *
  42  * Revision 1.1.1.1  1998/06/17 23:44:42  mdw
  43  * Initial version of mLib
  44  *
  45  */
  46
  47 /*----- Header files ------------------------------------------------------*/
  48
  49 /* --- ANSI headers --- */
  50
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54
  55 /* --- Local headers --- */
  56
  57 #include "alloc.h"
  58 #include "arena.h"
  59 #include "exc.h"
  60
  61 /*----- Functions and macros ----------------------------------------------*/
  62
  63 /* --- @x_alloc@ --- *
  64  *
  65  * Arguments:   @arena *a@ = pointer to underlying arena
  66  *              @size_t sz@ = size of block to allocate
  67  *
  68  * Returns:     Pointer to allocated block.
  69  *
  70  * Use:         Allocates memory.  If there's not enough memory, the
  71  *              exception @EXC_NOMEM@ is thrown.
  72  */
  73
  74 void *x_alloc(arena *a, size_t sz)
  75 {
  76   void *p = A_ALLOC(a, sz);
  77   if (!p)
  78     THROW(EXC_NOMEM);
  79   return (p);
  80 }
  81
  82 /* --- @x_strdup@ --- *
  83  *
  84  * Arguments:   @arena *a@ = pointer to underlying arena
  85  *              @const char *s@ = pointer to a string
  86  *
  87  * Returns:     Pointer to a copy of the string.
  88  *
  89  * Use:         Copies a string (like @strdup@ would, if it existed).  If
  90  *              there's not enough memory, the exception @EXC_NOMEM@ is
  91  *              thrown.
  92  */
  93
  94 char *x_strdup(arena *a, const char *s)
  95 {
  96   size_t sz = strlen(s) + 1;
  97   char *p = x_alloc(a, sz);
  98   memcpy(p, s, sz);
  99   return (p);
 100 }
 101
 102 /* --- @x_realloc@ --- *
 103  *
 104  * Arguments:   @arena *a@ = pointer to underlying arena
 105  *              @void *p@ = pointer to a block of memory
 106  *              @size_t sz@ = new size desired for the block
 107  *
 108  * Returns:     Pointer to the resized memory block (which is almost
 109  *              certainly not in the same place any more).
 110  *
 111  * Use:         Resizes a memory block.  If there's not enough memory, the
 112  *              exception @EXC_NOMEM@ is thrown.
 113  */
 114
 115 void *x_realloc(arena *a, void *p, size_t sz)
 116 {
 117   p = A_REALLOC(a, p, sz);
 118   if (!p)
 119     THROW(EXC_NOMEM);
 120   return (p);
 121 }
 122
 123 /* --- @x_free@ --- *
 124  *
 125  * Arguments:   @arena *a@ = pointer to underlying arena
 126  *              @void *p@ = pointer to a block of memory.
 127  *
 128  * Returns:     ---
 129  *
 130  * Use:         Frees a block of memory.
 131  */
 132
 133 void (x_free)(arena *a, void *p) { x_free(a, p); }
 134
 135 /*----- Old functions for the standard arena ------------------------------*/
 136
 137 /* --- @xmalloc@ --- *
 138  *
 139  * Arguments:   @size_t sz@ = size of block to allocate
 140  *
 141  * Returns:     Pointer to allocated block.
 142  *
 143  * Use:         Allocates memory.  If there's not enough memory, the
 144  *              exception @EXC_NOMEM@ is thrown.
 145  */
 146
 147 void *(xmalloc)(size_t sz) { return xmalloc(sz); }
 148
 149 /* --- @xstrdup@ --- *
 150  *
 151  * Arguments:   @const char *s@ = pointer to a string
 152  *
 153  * Returns:     Pointer to a copy of the string.
 154  *
 155  * Use:         Copies a string (like @strdup@ would, if it existed).  If
 156  *              there's not enough memory, the exception @EXC_NOMEM@ is
 157  *              thrown.
 158  */
 159
 160 char *(xstrdup)(const char *s) { return xstrdup(s); }
 161
 162 /* --- @xrealloc@ --- *
 163  *
 164  * Arguments:   @void *p@ = pointer to a block of memory
 165  *              @size_t sz@ = new size desired for the block
 166  *
 167  * Returns:     Pointer to the resized memory block (which is almost
 168  *              certainly not in the same place any more).
 169  *
 170  * Use:         Resizes a memory block.  If there's not enough memory, the
 171  *              exception @EXC_NOMEM@ is thrown.
 172  */
 173
 174 void *(xrealloc)(void *p, size_t sz) { return xrealloc(p, sz); }
 175
 176 /* --- @xfree@ --- *
 177  *
 178  * Arguments:   @void *p@ = pointer to a block of memory.
 179  *
 180  * Returns:     ---
 181  *
 182  * Use:         Frees a block of memory.
 183  */
 184
 185 void (xfree)(void *p) { xfree(p); }
 186
 187 /*----- That's all, folks -------------------------------------------------*/