libiberty/xmemdup.c

   1 /* xmemdup.c -- Duplicate a memory buffer, using xcalloc.
   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}, size_t @var{copy_size}, size_t @var{alloc_size})
   8
   9 Duplicates a region of memory without fail.  First, @var{alloc_size} bytes
  10 are allocated, then @var{copy_size} bytes from @var{input} are copied into
  11 it, and the new memory is returned.  If fewer bytes are copied than were
  12 allocated, the remaining memory is zeroed.
  13
  14 @end deftypefn
  15
  16 */
  17
  18 #ifdef HAVE_CONFIG_H
  19 #include "config.h"
  20 #endif
  21 #include "ansidecl.h"
  22 #include "libiberty.h"
  23
  24 #include <sys/types.h> /* For size_t. */
  25 #ifdef HAVE_STRING_H
  26 #include <string.h>
  27 #else
  28 # ifdef HAVE_STRINGS_H
  29 #  include <strings.h>
  30 # endif
  31 #endif
  32
  33 PTR
  34 xmemdup (const PTR input, size_t copy_size, size_t alloc_size)
  35 {
  36   PTR output = xcalloc (1, alloc_size);
  37   return (PTR) memcpy (output, input, copy_size);
  38 }