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cell-binutils  2.17cvs20070401
strndup.c
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00001 /* Implement the strndup function.
00002    Copyright (C) 2005 Free Software Foundation, Inc.
00003    Written by Kaveh R. Ghazi <ghazi@caip.rutgers.edu>.
00004 
00005 This file is part of the libiberty library.
00006 Libiberty is free software; you can redistribute it and/or
00007 modify it under the terms of the GNU Library General Public
00008 License as published by the Free Software Foundation; either
00009 version 2 of the License, or (at your option) any later version.
00010 
00011 Libiberty is distributed in the hope that it will be useful,
00012 but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014 Library General Public License for more details.
00015 
00016 You should have received a copy of the GNU Library General Public
00017 License along with libiberty; see the file COPYING.LIB.  If
00018 not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
00019 Boston, MA 02110-1301, USA.  */
00020 
00021 /*
00022 
00023 @deftypefn Extension char* strndup (const char *@var{s}, size_t @var{n})
00024 
00025 Returns a pointer to a copy of @var{s} with at most @var{n} characters
00026 in memory obtained from @code{malloc}, or @code{NULL} if insufficient
00027 memory was available.  The result is always NUL terminated.
00028 
00029 @end deftypefn
00030 
00031 */
00032 
00033 #include "ansidecl.h"
00034 #include <stddef.h>
00035 
00036 extern size_t strlen (const char*);
00037 extern PTR    malloc (size_t);
00038 extern PTR    memcpy (PTR, const PTR, size_t);
00039 
00040 char *
00041 strndup (const char *s, size_t n)
00042 {
00043   char *result;
00044   size_t len = strlen (s);
00045 
00046   if (n < len)
00047     len = n;
00048 
00049   result = (char *) malloc (len + 1);
00050   if (!result)
00051     return 0;
00052 
00053   result[len] = '\0';
00054   return (char *) memcpy (result, s, len);
00055 }