1*a9fa9459Szrj /* xmemdup.c -- Duplicate a memory buffer, using xmalloc.
2*a9fa9459Szrj This trivial function is in the public domain.
3*a9fa9459Szrj Jeff Garzik, September 1999. */
4*a9fa9459Szrj
5*a9fa9459Szrj /*
6*a9fa9459Szrj
7*a9fa9459Szrj @deftypefn Replacement void* xmemdup (void *@var{input}, @
8*a9fa9459Szrj size_t @var{copy_size}, size_t @var{alloc_size})
9*a9fa9459Szrj
10*a9fa9459Szrj Duplicates a region of memory without fail. First, @var{alloc_size} bytes
11*a9fa9459Szrj are allocated, then @var{copy_size} bytes from @var{input} are copied into
12*a9fa9459Szrj it, and the new memory is returned. If fewer bytes are copied than were
13*a9fa9459Szrj allocated, the remaining memory is zeroed.
14*a9fa9459Szrj
15*a9fa9459Szrj @end deftypefn
16*a9fa9459Szrj
17*a9fa9459Szrj */
18*a9fa9459Szrj
19*a9fa9459Szrj #ifdef HAVE_CONFIG_H
20*a9fa9459Szrj #include "config.h"
21*a9fa9459Szrj #endif
22*a9fa9459Szrj #include "ansidecl.h"
23*a9fa9459Szrj #include "libiberty.h"
24*a9fa9459Szrj
25*a9fa9459Szrj #include <sys/types.h> /* For size_t. */
26*a9fa9459Szrj #ifdef HAVE_STRING_H
27*a9fa9459Szrj #include <string.h>
28*a9fa9459Szrj #else
29*a9fa9459Szrj # ifdef HAVE_STRINGS_H
30*a9fa9459Szrj # include <strings.h>
31*a9fa9459Szrj # endif
32*a9fa9459Szrj #endif
33*a9fa9459Szrj
34*a9fa9459Szrj PTR
xmemdup(const PTR input,size_t copy_size,size_t alloc_size)35*a9fa9459Szrj xmemdup (const PTR input, size_t copy_size, size_t alloc_size)
36*a9fa9459Szrj {
37*a9fa9459Szrj PTR output = xmalloc (alloc_size);
38*a9fa9459Szrj if (alloc_size > copy_size)
39*a9fa9459Szrj memset ((char *) output + copy_size, 0, alloc_size - copy_size);
40*a9fa9459Szrj return (PTR) memcpy (output, input, copy_size);
41*a9fa9459Szrj }
42