src/include/strlcat.c

   1 /* liblxcapi
   2  *
   3  * Copyright © 2018 Christian Brauner <christian@brauner.io>.
   4  * Copyright © 2018 Canonical Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * This function has been copied from musl.
  20  */
  21
  22 #include <limits.h>
  23 #include <stdint.h>
  24 #include <string.h>
  25
  26 #ifndef HAVE_STRLCPY
  27 #include "strlcpy.h"
  28 #endif
  29
  30 size_t strlcat(char *d, const char *s, size_t n)
  31 {
  32         size_t l = strnlen(d, n);
  33         if (l == n)
  34                 return l + strlen(s);
  35
  36         return l + strlcpy(d + l, s, n - l);
  37 }