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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. }
  56.