kc3-lang/gnulib/tests/null-ptr.h

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• Hash : 7b089321
  Author :
  Date : 2025-01-01T09:24:36
  

  maint: run 'make update-copyright'
  

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• tests/null-ptr.h

• /* Return a NULL pointer, without letting the compiler know it.
     Copyright (C) 2017-2025 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  #include <stdlib.h>
  
  /* Return NULL.
     Usual compilers are not able to infer something about the return value.  */
  static void *
  null_ptr (void)
  {
    unsigned int x = rand ();
    unsigned int y = x * x;
    if (y & 2)
      return (void *) -1;
    else
      return (void *) 0;
  }
  
  /* If you want to know why this always returns NULL, read
     https://en.wikipedia.org/wiki/Quadratic_residue#Prime_power_modulus .  */
  

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