[thirdparty/gcc.git] / libiberty / xmemdup.c

/* 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

PTR
xmemdup (const PTR input, size_t copy_size, size_t alloc_size)
{
  PTR output = xmalloc (alloc_size);
  if (alloc_size > copy_size)
    memset ((char *) output + copy_size, 0, alloc_size - copy_size);
  return (PTR) memcpy (output, input, copy_size);
}
Commit	Line	Data
	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	PTR
	35	xmemdup (const PTR input, size_t copy_size, size_t alloc_size)
	36	{
	37	PTR output = xmalloc (alloc_size);
	38	if (alloc_size > copy_size)
	39	memset ((char *) output + copy_size, 0, alloc_size - copy_size);
	40	return (PTR) memcpy (output, input, copy_size);
	41	}