116dce513Schristos /* xmemdup.c -- Duplicate a memory buffer, using xmalloc.
216dce513Schristos This trivial function is in the public domain.
316dce513Schristos Jeff Garzik, September 1999. */
416dce513Schristos
516dce513Schristos /*
616dce513Schristos
716dce513Schristos @deftypefn Replacement void* xmemdup (void *@var{input}, @
816dce513Schristos size_t @var{copy_size}, size_t @var{alloc_size})
916dce513Schristos
1016dce513Schristos Duplicates a region of memory without fail. First, @var{alloc_size} bytes
1116dce513Schristos are allocated, then @var{copy_size} bytes from @var{input} are copied into
1216dce513Schristos it, and the new memory is returned. If fewer bytes are copied than were
1316dce513Schristos allocated, the remaining memory is zeroed.
1416dce513Schristos
1516dce513Schristos @end deftypefn
1616dce513Schristos
1716dce513Schristos */
1816dce513Schristos
1916dce513Schristos #ifdef HAVE_CONFIG_H
2016dce513Schristos #include "config.h"
2116dce513Schristos #endif
2216dce513Schristos #include "ansidecl.h"
2316dce513Schristos #include "libiberty.h"
2416dce513Schristos
2516dce513Schristos #include <sys/types.h> /* For size_t. */
2616dce513Schristos #ifdef HAVE_STRING_H
2716dce513Schristos #include <string.h>
2816dce513Schristos #else
2916dce513Schristos # ifdef HAVE_STRINGS_H
3016dce513Schristos # include <strings.h>
3116dce513Schristos # endif
3216dce513Schristos #endif
3316dce513Schristos
34*e992f068Schristos void *
xmemdup(const void * input,size_t copy_size,size_t alloc_size)35*e992f068Schristos xmemdup (const void *input, size_t copy_size, size_t alloc_size)
3616dce513Schristos {
37*e992f068Schristos void *output = xmalloc (alloc_size);
3816dce513Schristos if (alloc_size > copy_size)
3916dce513Schristos memset ((char *) output + copy_size, 0, alloc_size - copy_size);
40*e992f068Schristos return (void *) memcpy (output, input, copy_size);
4116dce513Schristos }
42