1 /* Implement the stpncpy function.
2 Copyright (C) 2003-2018 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 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 *
stpncpy(char * dst,const char * src,size_t len)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