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