1  /* xmemdup.c -- Duplicate a memory buffer, using xmalloc.
       2     This trivial function is in the public domain.
       3     Jeff Garzik, September 1999.  */
       4  
       5  /*
       6  
       7  @deftypefn Replacement void* xmemdup (void *@var{input}, @
       8    size_t @var{copy_size}, size_t @var{alloc_size})
       9  
      10  Duplicates a region of memory without fail.  First, @var{alloc_size} bytes
      11  are allocated, then @var{copy_size} bytes from @var{input} are copied into
      12  it, and the new memory is returned.  If fewer bytes are copied than were
      13  allocated, the remaining memory is zeroed.
      14  
      15  @end deftypefn
      16  
      17  */
      18  
      19  #ifdef HAVE_CONFIG_H
      20  #include "config.h"
      21  #endif
      22  #include "ansidecl.h"
      23  #include "libiberty.h"
      24  
      25  #include <sys/types.h> /* For size_t. */
      26  #ifdef HAVE_STRING_H
      27  #include <string.h>
      28  #else
      29  # ifdef HAVE_STRINGS_H
      30  #  include <strings.h>
      31  # endif
      32  #endif
      33  
      34  void *
      35  xmemdup (const void *input, size_t copy_size, size_t alloc_size)
      36  {
      37    void *output = xmalloc (alloc_size);
      38    if (alloc_size > copy_size)
      39      memset ((char *) output + copy_size, 0, alloc_size - copy_size);
      40    return (void *) memcpy (output, input, copy_size);
      41  }