mdw@git.distorted.org.uk Git - disorder/blob - lib/mem.c

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2004, 2005, 2006 Richard Kettlewell
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18  * USA
  19  */
  20
  21 #include <config.h>
  22 #include "types.h"
  23
  24 #include <gc.h>
  25 #include <errno.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29
  30 #include "mem.h"
  31 #include "log.h"
  32 #include "printf.h"
  33
  34 #include "disorder.h"
  35
  36 static void *(*do_malloc)(size_t) = GC_malloc;
  37 static void *(*do_realloc)(void *, size_t) = GC_realloc;
  38 static void *(*do_malloc_atomic)(size_t) = GC_malloc_atomic;
  39 static void (*do_free)(void *) = GC_free;
  40
  41 static void *malloc_and_zero(size_t n) {
  42   void *ptr = malloc(n);
  43
  44   if(ptr) memset(ptr, 0, n);
  45   return ptr;
  46 }
  47
  48 void mem_init(int gc) {
  49   const char *e;
  50
  51   if(!gc || ((e = getenv("DISORDER_GC")) && !strcmp(e, "no"))) {
  52     do_malloc = malloc_and_zero;
  53     do_malloc_atomic = malloc;
  54     do_realloc = realloc;
  55     do_free = free;
  56   } else
  57     GC_init();
  58 }
  59
  60 void *xmalloc(size_t n) {
  61   void *ptr;
  62
  63   if(!(ptr = do_malloc(n)) && n)
  64     fatal(errno, "error allocating memory");
  65   return ptr;
  66 }
  67
  68 void *xrealloc(void *ptr, size_t n) {
  69   if(!(ptr = do_realloc(ptr, n)) && n)
  70     fatal(errno, "error allocating memory");
  71   return ptr;
  72 }
  73
  74 void *xcalloc(size_t count, size_t size) {
  75   if(count > SIZE_MAX / size)
  76     fatal(0, "excessively large calloc");
  77   return xmalloc(count * size);
  78 }
  79
  80 void *xmalloc_noptr(size_t n) {
  81   void *ptr;
  82
  83   if(!(ptr = do_malloc_atomic(n)) && n)
  84     fatal(errno, "error allocating memory");
  85   return ptr;
  86 }
  87
  88 void *xrealloc_noptr(void *ptr, size_t n) {
  89   if(ptr == 0)
  90     return xmalloc_noptr(n);
  91   if(!(ptr = do_realloc(ptr, n)) && n)
  92     fatal(errno, "error allocating memory");
  93   return ptr;
  94 }
  95
  96 char *xstrdup(const char *s) {
  97   char *t;
  98
  99   if(!(t = do_malloc_atomic(strlen(s) + 1)))
 100     fatal(errno, "error allocating memory");
 101   return strcpy(t, s);
 102 }
 103
 104 char *xstrndup(const char *s, size_t n) {
 105   char *t;
 106
 107   if(!(t = do_malloc_atomic(n + 1)))
 108     fatal(errno, "error allocating memory");
 109   memcpy(t, s, n);
 110   t[n] = 0;
 111   return t;
 112 }
 113
 114 void xfree(void *ptr) {
 115   do_free(ptr);
 116 }
 117
 118 /*
 119 Local Variables:
 120 c-basic-offset:2
 121 comment-column:40
 122 End:
 123 */
 124 /* arch-tag:fceaf81fe79b2f4f87c9541774a2b8f2 */