zmalloc.c

   1 /* zmalloc - total amount of allocated memory aware version of malloc()
   2  *
   3  * Copyright (c) 2006-2009, Salvatore Sanfilippo <antirez at gmail dot com>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  *   * Redistributions of source code must retain the above copyright notice,
  10  *     this list of conditions and the following disclaimer.
  11  *   * Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  *   * Neither the name of Redis nor the names of its contributors may be used
  15  *     to endorse or promote products derived from this software without
  16  *     specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28  * POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include "config.h"
  34
  35 static size_t used_memory = 0;
  36
  37 void *zmalloc(size_t size) {
  38     void *ptr = malloc(size+sizeof(size_t));
  39
  40     if (!ptr) return NULL;
  41 #ifdef HAVE_MALLOC_SIZE
  42     used_memory += redis_malloc_size(ptr);
  43     return ptr;
  44 #else
  45     *((size_t*)ptr) = size;
  46     used_memory += size+sizeof(size_t);
  47     return (char*)ptr+sizeof(size_t);
  48 #endif
  49 }
  50
  51 void *zrealloc(void *ptr, size_t size) {
  52 #ifndef HAVE_MALLOC_SIZE
  53     void *realptr;
  54 #endif
  55     size_t oldsize;
  56     void *newptr;
  57
  58     if (ptr == NULL) return zmalloc(size);
  59 #ifdef HAVE_MALLOC_SIZE
  60     oldsize = redis_malloc_size(ptr);
  61     newptr = realloc(ptr,size);
  62     if (!newptr) return NULL;
  63
  64     used_memory -= oldsize;
  65     used_memory += redis_malloc_size(newptr);
  66     return newptr;
  67 #else
  68     realptr = (char*)ptr-sizeof(size_t);
  69     oldsize = *((size_t*)realptr);
  70     newptr = realloc(realptr,size+sizeof(size_t));
  71     if (!newptr) return NULL;
  72
  73     *((size_t*)newptr) = size;
  74     used_memory -= oldsize;
  75     used_memory += size;
  76     return (char*)newptr+sizeof(size_t);
  77 #endif
  78 }
  79
  80 void zfree(void *ptr) {
  81 #ifndef HAVE_MALLOC_SIZE
  82     void *realptr;
  83     size_t oldsize;
  84 #endif
  85
  86     if (ptr == NULL) return;
  87 #ifdef HAVE_MALLOC_SIZE
  88     used_memory -= redis_malloc_size(ptr);
  89     free(ptr);
  90 #else
  91     realptr = (char*)ptr-sizeof(size_t);
  92     oldsize = *((size_t*)realptr);
  93     used_memory -= oldsize+sizeof(size_t);
  94     free(realptr);
  95 #endif
  96 }
  97
  98 char *zstrdup(const char *s) {
  99     size_t l = strlen(s)+1;
 100     char *p = zmalloc(l);
 101
 102     memcpy(p,s,l);
 103     return p;
 104 }
 105
 106 size_t zmalloc_used_memory(void) {
 107     return used_memory;
 108 }