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
xmemdup(const PTR input,size_t copy_size,size_t alloc_size)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 }
42