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/* Implement the strndup function.

   Copyright (C) 2005 Free Software Foundation, Inc.

   Written by Kaveh R. Ghazi <ghazi@caip.rutgers.edu>.

This file is part of the libiberty library.

Libiberty is free software; you can redistribute it and/or

modify it under the terms of the GNU Library General Public

License as published by the Free Software Foundation; either

version 2 of the License, or (at your option) any later version.

Libiberty is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

Library General Public License for more details.

You should have received a copy of the GNU Library General Public

License along with libiberty; see the file COPYING.LIB.  If

not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,

Boston, MA 02110-1301, USA.  */

/*

@deftypefn Extension char* strndup (const char *@var{s}, size_t @var{n})

Returns a pointer to a copy of @var{s} with at most @var{n} characters

in memory obtained from @code{malloc}, or @code{NULL} if insufficient

memory was available.  The result is always NUL terminated.

@end deftypefn

*/

#include "ansidecl.h"

#include <stddef.h>

extern size_t   strlen (const char*);

extern PTR      malloc (size_t);

extern PTR      memcpy (PTR, const PTR, size_t);

char *

strndup (const char *s, size_t n)

{

  char *result;

  size_t len = strlen (s);

  if (n < len)

    len = n;

  result = (char *) malloc (len + 1);

  if (!result)

    return 0;

  result[len] = '\0';

  return (char *) memcpy (result, s, len);

}