-/* xmemdup.c -- Duplicate a memory buffer, using xcalloc.
+/* 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 <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 (input, copy_size, alloc_size)
- const PTR input;
- size_t copy_size;
- size_t alloc_size;
+xmemdup (const PTR input, size_t copy_size, size_t alloc_size)
{
- PTR output = xcalloc (1, alloc_size);
- memcpy (output, input, copy_size);
- return output;
+ 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);
}