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RIOT/sys/oneway-malloc/oneway-malloc.c 1.45 KB
a752c7ab   elopes   add first test an...
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  /*
   * Copyright (C) 2013 Freie Universitรคt Berlin
   *
   * This file is subject to the terms and conditions of the GNU Lesser
   * General Public License v2.1. See the file LICENSE in the top level
   * directory for more details.
   */
  
  /**
   * @addtogroup oneway_malloc
   * @ingroup sys
   * @{
   *
   * @file
   * @brief       Simple malloc wrapper for SBRK
  
   * @author      Kaspar Schleiser <kaspar@schleiser.de>
   *
   * @}
   */
  
  #include <string.h>
  
  #include "malloc.h"
  
  #define ENABLE_DEBUG    (0)
  #include "debug.h"
  
  extern void *sbrk(int incr);
  
  void __attribute__((weak)) *malloc(size_t size)
  {
      if (size != 0) {
          void *ptr = sbrk(size);
  
          DEBUG("malloc(): allocating block of size %u at %p.\n", (unsigned int) size, ptr);
  
          if (ptr != (void*) -1) {
              return ptr;
          }
      }
      return NULL;
  }
  
  void __attribute__((weak)) *realloc(void *ptr, size_t size)
  {
      if (ptr == NULL) {
          return malloc(size);
      }
      else if (size == 0) {
          free(ptr);
          return NULL;
      }
      else {
          void *newptr = malloc(size);
          if (newptr) {
              memcpy(newptr, ptr, size);
          }
          return newptr;
      }
  }
  
  void __attribute__((weak)) *calloc(size_t size, size_t cnt)
  {
      void *mem = malloc(size * cnt);
      if (mem) {
          memset(mem, 0, size * cnt);
      }
      return mem;
  }
  
  void __attribute__((weak)) free(void *ptr)
  {
      /* who cares about pointers? */
      (void) ptr;
  
      DEBUG("free(): block at %p lost.\n", ptr);
  }