Mercurial > hg > CbC > CbC_gcc
comparison libiberty/strndup.c @ 0:a06113de4d67
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author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
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children | 04ced10e8804 |
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1 /* Implement the strndup function. | |
2 Copyright (C) 2005 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 strlen (const char*); | |
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 = strlen (s); | |
45 | |
46 if (n < len) | |
47 len = n; | |
48 | |
49 result = (char *) malloc (len + 1); | |
50 if (!result) | |
51 return 0; | |
52 | |
53 result[len] = '\0'; | |
54 return (char *) memcpy (result, s, len); | |
55 } |