/* xmemdup.c -- Duplicate a memory buffer, using xmalloc.

   This trivial function is in the public domain.

   Jeff Garzik, September 1999.  */

/*

@deftypefn Replacement void* xmemdup (void *@var{input}, @

  size_t @var{copy_size}, size_t @var{alloc_size})

Duplicates a region of memory without fail.  First, @var{alloc_size} bytes

are allocated, then @var{copy_size} bytes from @var{input} are copied into

it, and the new memory is returned.  If fewer bytes are copied than were

allocated, the remaining memory is zeroed.

@end deftypefn

*/

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "ansidecl.h"

#include "libiberty.h"

#include <sys/types.h> /* For size_t. */

#ifdef HAVE_STRING_H

#include <string.h>

#else

# ifdef HAVE_STRINGS_H

#  include <strings.h>

# endif

#endif

void *

xmemdup (const void *input, size_t copy_size, size_t alloc_size)

{

  void *output = xmalloc (alloc_size);

  if (alloc_size > copy_size)

    memset ((char *) output + copy_size, 0, alloc_size - copy_size);

  return (void *) memcpy (output, input, copy_size);

}