merge from gcc
[binutils.git] / libiberty / xmemdup.c
blobd4831163a204fe8e3a9ec5454577f269bd0fc514
1 /* xmemdup.c -- Duplicate a memory buffer, using xcalloc.
2 This trivial function is in the public domain.
3 Jeff Garzik, September 1999. */
5 /*
7 @deftypefn Replacement void* xmemdup (void *@var{input}, size_t @var{copy_size}, size_t @var{alloc_size})
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.
14 @end deftypefn
18 #ifdef HAVE_CONFIG_H
19 #include "config.h"
20 #endif
21 #include "ansidecl.h"
22 #include "libiberty.h"
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
33 PTR
34 xmemdup (const PTR input, size_t copy_size, size_t alloc_size)
36 PTR output = xcalloc (1, alloc_size);
37 return (PTR) memcpy (output, input, copy_size);