1  /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <limits.h>
      19  #define ffsl __something_else
      20  #include <string.h>
      21  
      22  #undef	ffsll
      23  
      24  /* Find the first bit set in I.  */
      25  int
      26  ffsll (long long int i)
      27  {
      28    unsigned long long int x = i & -i;
      29  
      30    if (x <= 0xffffffff)
      31      return ffs (i);
      32    else
      33      return 32 + ffs (i >> 32);
      34  }
      35  
      36  #if ULONG_MAX != UINT_MAX
      37  #undef ffsl
      38  weak_alias (ffsll, ffsl)
      39  #endif