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1 /* Implement the strndup function.
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2 Copyright (C) 2005 Free Software Foundation, Inc.
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3 Written by Kaveh R. Ghazi <ghazi@caip.rutgers.edu>.
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4
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5 This file is part of the libiberty library.
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6 Libiberty is free software; you can redistribute it and/or
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7 modify it under the terms of the GNU Library General Public
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8 License as published by the Free Software Foundation; either
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9 version 2 of the License, or (at your option) any later version.
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10
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11 Libiberty is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 Library General Public License for more details.
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15
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16 You should have received a copy of the GNU Library General Public
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17 License along with libiberty; see the file COPYING.LIB. If
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18 not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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19 Boston, MA 02110-1301, USA. */
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20
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21 /*
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22
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23 @deftypefn Extension char* strndup (const char *@var{s}, size_t @var{n})
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24
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25 Returns a pointer to a copy of @var{s} with at most @var{n} characters
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26 in memory obtained from @code{malloc}, or @code{NULL} if insufficient
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27 memory was available. The result is always NUL terminated.
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28
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29 @end deftypefn
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30
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31 */
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32
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33 #include "ansidecl.h"
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34 #include <stddef.h>
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35
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36 extern size_t strlen (const char*);
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37 extern PTR malloc (size_t);
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38 extern PTR memcpy (PTR, const PTR, size_t);
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39
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40 char *
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41 strndup (const char *s, size_t n)
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42 {
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43 char *result;
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44 size_t len = strlen (s);
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45
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46 if (n < len)
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47 len = n;
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48
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49 result = (char *) malloc (len + 1);
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50 if (!result)
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51 return 0;
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52
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53 result[len] = '\0';
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54 return (char *) memcpy (result, s, len);
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55 }
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