libiberty/stpncpy.c

   1 /* Implement the stpncpy function.
   2    Copyright (C) 2003 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., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /*
  22
  23 @deftypefn Supplemental char* stpncpy (char *@var{dst}, const char *@var{src}, size_t @var{len})
  24
  25 Copies the string @var{src} into @var{dst}, copying exactly @var{len}
  26 and padding with zeros if necessary.  If @var{len} < strlen(@var{src})
  27 then return @var{dst} + @var{len}, otherwise returns @var{dst} +
  28 strlen(@var{src}).
  29
  30 @end deftypefn
  31
  32 */
  33
  34 #include <ansidecl.h>
  35 #ifdef ANSI_PROTOTYPES
  36 #include <stddef.h>
  37 #else
  38 #define size_t unsigned long
  39 #endif
  40
  41 extern size_t strlen PARAMS ((const char *));
  42 extern char *strncpy PARAMS ((char *, const char *, size_t));
  43
  44 char *
  45 stpncpy (dst, src, len)
  46      char *dst;
  47      const char *src;
  48      size_t len;
  49 {
  50   size_t n = strlen (src);
  51   if (n > len)
  52     n = len;
  53   return strncpy (dst, src, len) + n;
  54 }