1  /* Convert an IPv6 scope ID from text to the internal representation.
       2     Copyright (C) 2016-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library 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 GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <net-internal.h>
      20  
      21  #include <ctype.h>
      22  #include <errno.h>
      23  #include <locale.h>
      24  #include <net/if.h>
      25  #include <stdbool.h>
      26  #include <stdint.h>
      27  #include <stdlib.h>
      28  
      29  /* Parse SOURCE as a scope ID for ADDRESS.  Return 0 on success and -1
      30     on error.  */
      31  int
      32  __inet6_scopeid_pton (const struct in6_addr *address, const char *scope,
      33                        uint32_t *result)
      34  {
      35    if (IN6_IS_ADDR_LINKLOCAL (address)
      36        || IN6_IS_ADDR_MC_NODELOCAL (address)
      37        || IN6_IS_ADDR_MC_LINKLOCAL (address))
      38      {
      39        uint32_t number = __if_nametoindex (scope);
      40        if (number != 0)
      41          {
      42            *result = number;
      43            return 0;
      44          }
      45      }
      46  
      47    if (isdigit_l (scope[0], _nl_C_locobj_ptr))
      48      {
      49        char *end;
      50        unsigned long long number
      51          = ____strtoull_l_internal (scope, &end, /*base */ 10, /* group */ 0,
      52                                     /* bin_cst */ false, _nl_C_locobj_ptr);
      53        if (*end == '\0' && number <= UINT32_MAX)
      54          {
      55            *result = number;
      56            return 0;
      57          }
      58      }
      59  
      60    __set_errno (EINVAL);
      61    return -1;
      62  }
      63  
      64  libc_hidden_def (__inet6_scopeid_pton)