(libc.info.gz) Allocating Cleared Space

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 3.2.2.5 Allocating Cleared Space
 ................................
 
 The function `calloc' allocates memory and clears it to zero.  It is
 declared in `stdlib.h'.  
 
  -- Function: void * calloc (size_t COUNT, size_t ELTSIZE)
      This function allocates a block long enough to contain a vector of
      COUNT elements, each of size ELTSIZE.  Its contents are cleared to
      zero before `calloc' returns.
 
    You could define `calloc' as follows:
 
      void *
      calloc (size_t count, size_t eltsize)
      {
        size_t size = count * eltsize;
        void *value = malloc (size);
        if (value != 0)
          memset (value, 0, size);
        return value;
      }
 
    But in general, it is not guaranteed that `calloc' calls `malloc'
 internally.  Therefore, if an application provides its own
 `malloc'/`realloc'/`free' outside the C library, it should always
 define `calloc', too.
 

Info Catalog

(libc.info.gz) Changing Block Size

(libc.info.gz) Unconstrained Allocation

(libc.info.gz) Efficiency and Malloc