libiberty/stpncpy.c

   1 /* Implement the stpncpy function.
   2    Copyright (C) 2003-2022 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 }