| 1 | /* Implement the strndup function. |
| 2 | Copyright (C) 2005-2020 Free Software Foundation, Inc. |
| 3 | Written by Kaveh R. Ghazi <ghazi@caip.rutgers.edu>. |
| 4 | |
| 5 | This file is part of the libiberty library. |
| 6 | Libiberty is free software; you can redistribute it and/or |
| 7 | modify it under the terms of the GNU Library General Public |
| 8 | License as published by the Free Software Foundation; either |
| 9 | version 2 of the License, or (at your option) any later version. |
| 10 | |
| 11 | Libiberty is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | Library General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU Library General Public |
| 17 | License along with libiberty; see the file COPYING.LIB. If |
| 18 | not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, |
| 19 | Boston, MA 02110-1301, USA. */ |
| 20 | |
| 21 | /* |
| 22 | |
| 23 | @deftypefn Extension char* strndup (const char *@var{s}, size_t @var{n}) |
| 24 | |
| 25 | Returns a pointer to a copy of @var{s} with at most @var{n} characters |
| 26 | in memory obtained from @code{malloc}, or @code{NULL} if insufficient |
| 27 | memory was available. The result is always NUL terminated. |
| 28 | |
| 29 | @end deftypefn |
| 30 | |
| 31 | */ |
| 32 | |
| 33 | #include "ansidecl.h" |
| 34 | #include <stddef.h> |
| 35 | |
| 36 | extern size_t strnlen (const char *s, size_t maxlen); |
| 37 | extern PTR malloc (size_t); |
| 38 | extern PTR memcpy (PTR, const PTR, size_t); |
| 39 | |
| 40 | char * |
| 41 | strndup (const char *s, size_t n) |
| 42 | { |
| 43 | char *result; |
| 44 | size_t len = strnlen (s, n); |
| 45 | |
| 46 | result = (char *) malloc (len + 1); |
| 47 | if (!result) |
| 48 | return 0; |
| 49 | |
| 50 | result[len] = '\0'; |
| 51 | return (char *) memcpy (result, s, len); |
| 52 | } |