blob: 1d300ed2553294dcef8e7944e7814e3f4aa3283a [file] [log] [blame]
/* Implement the strndup function.
Copyright (C) 2005-2021 Free Software Foundation, Inc.
Written by Kaveh R. Ghazi <>.
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
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 strnlen (const char *s, size_t maxlen);
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 = strnlen (s, n);
result = (char *) malloc (len + 1);
if (!result)
return 0;
result[len] = '\0';
return (char *) memcpy (result, s, len);