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  1. /* Implement the stpncpy function.
  2.    Copyright (C) 2003, 2011 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 Supplemental char* stpncpy (char *@var{dst}, const char *@var{src}, @
  24.   size_t @var{len})
  25.  
  26. Copies the string @var{src} into @var{dst}, copying exactly @var{len}
  27. and padding with zeros if necessary.  If @var{len} < strlen(@var{src})
  28. then return @var{dst} + @var{len}, otherwise returns @var{dst} +
  29. strlen(@var{src}).
  30.  
  31. @end deftypefn
  32.  
  33. */
  34.  
  35. #include <ansidecl.h>
  36. #include <stddef.h>
  37.  
  38. extern size_t strlen (const char *);
  39. extern char *strncpy (char *, const char *, size_t);
  40.  
  41. char *
  42. stpncpy (char *dst, const char *src, size_t len)
  43. {
  44.   size_t n = strlen (src);
  45.   if (n > len)
  46.     n = len;
  47.   return strncpy (dst, src, len) + n;
  48. }
  49.