libiberty/xstrndup.c

   1 /* Implement the xstrndup function.
   2    Copyright (C) 2005-2018 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 Replacement char* xstrndup (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 without fail, using @code{xmalloc} to obtain memory.  The result is
  27 always NUL terminated.
  28
  29 @end deftypefn
  30
  31 */
  32
  33 #ifdef HAVE_CONFIG_H
  34 #include "config.h"
  35 #endif
  36 #include <sys/types.h>
  37 #ifdef HAVE_STRING_H
  38 #include <string.h>
  39 #else
  40 # ifdef HAVE_STRINGS_H
  41 #  include <strings.h>
  42 # endif
  43 #endif
  44 #include "ansidecl.h"
  45 #include "libiberty.h"
  46
  47 char *
  48 xstrndup (const char *s, size_t n)
  49 {
  50   char *result;
  51   size_t len = strnlen (s, n);
  52
  53   result = XNEWVEC (char, len + 1);
  54
  55   result[len] = '\0';
  56   return (char *) memcpy (result, s, len);
  57 }