binutils-gdb/libiberty/xmemdup.c

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/* xmemdup.c -- Duplicate a memory buffer, using xmalloc.
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This trivial function is in the public domain.
Jeff Garzik, September 1999. */
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/*
@deftypefn Replacement void* xmemdup (void *@var{input}, @
size_t @var{copy_size}, size_t @var{alloc_size})
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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
*/
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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ansidecl.h"
#include "libiberty.h"
#include <sys/types.h> /* For size_t. */
#ifdef HAVE_STRING_H
#include <string.h>
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#else
# ifdef HAVE_STRINGS_H
# include <strings.h>
# endif
#endif
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PTR
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xmemdup (const PTR input, size_t copy_size, size_t alloc_size)
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{
PTR output = xmalloc (alloc_size);
if (alloc_size > copy_size)
memset ((char *) output + copy_size, 0, alloc_size - copy_size);
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return (PTR) memcpy (output, input, copy_size);
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}