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, 2007 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 #if GC
  25 #include <gc.h>
  26 #endif
  27 #include <errno.h>
  28 #include <string.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <assert.h>
  32
  33 #include "mem.h"
  34 #include "log.h"
  35 #include "printf.h"
  36
  37 #include "disorder.h"
  38
  39 static void *malloc_and_zero(size_t n) {
  40   void *ptr = malloc(n);
  41
  42   if(ptr) memset(ptr, 0, n);
  43   return ptr;
  44 }
  45
  46 #if GC
  47 static void *(*do_malloc)(size_t) = GC_malloc;
  48 static void *(*do_realloc)(void *, size_t) = GC_realloc;
  49 static void *(*do_malloc_atomic)(size_t) = GC_malloc_atomic;
  50 static void (*do_free)(void *) = GC_free;
  51 #else
  52 static void *(*do_malloc)(size_t) = malloc_and_zero;
  53 static void *(*do_realloc)(void *, size_t) = realloc;
  54 static void *(*do_malloc_atomic)(size_t) = malloc;
  55 static void (*do_free)(void *) = free;
  56 #endif
  57
  58 void mem_init(void) {
  59 #if GC
  60   const char *e;
  61
  62   if(((e = getenv("DISORDER_GC")) && !strcmp(e, "no"))) {
  63     do_malloc = malloc_and_zero;
  64     do_malloc_atomic = malloc;
  65     do_realloc = realloc;
  66     do_free = free;
  67   } else {
  68     GC_init();
  69     assert(GC_all_interior_pointers);
  70   }
  71 #endif
  72 }
  73
  74 void *xmalloc(size_t n) {
  75   void *ptr;
  76
  77   if(!(ptr = do_malloc(n)) && n)
  78     fatal(errno, "error allocating memory");
  79   return ptr;
  80 }
  81
  82 void *xrealloc(void *ptr, size_t n) {
  83   if(!(ptr = do_realloc(ptr, n)) && n)
  84     fatal(errno, "error allocating memory");
  85   return ptr;
  86 }
  87
  88 void *xcalloc(size_t count, size_t size) {
  89   if(count > SIZE_MAX / size)
  90     fatal(0, "excessively large calloc");
  91   return xmalloc(count * size);
  92 }
  93
  94 void *xmalloc_noptr(size_t n) {
  95   void *ptr;
  96
  97   if(!(ptr = do_malloc_atomic(n)) && n)
  98     fatal(errno, "error allocating memory");
  99   return ptr;
 100 }
 101
 102 void *xrealloc_noptr(void *ptr, size_t n) {
 103   if(ptr == 0)
 104     return xmalloc_noptr(n);
 105   if(!(ptr = do_realloc(ptr, n)) && n)
 106     fatal(errno, "error allocating memory");
 107   return ptr;
 108 }
 109
 110 char *xstrdup(const char *s) {
 111   char *t;
 112
 113   if(!(t = do_malloc_atomic(strlen(s) + 1)))
 114     fatal(errno, "error allocating memory");
 115   return strcpy(t, s);
 116 }
 117
 118 char *xstrndup(const char *s, size_t n) {
 119   char *t;
 120
 121   if(!(t = do_malloc_atomic(n + 1)))
 122     fatal(errno, "error allocating memory");
 123   memcpy(t, s, n);
 124   t[n] = 0;
 125   return t;
 126 }
 127
 128 void xfree(void *ptr) {
 129   do_free(ptr);
 130 }
 131
 132 /*
 133 Local Variables:
 134 c-basic-offset:2
 135 comment-column:40
 136 End:
 137 */