kc3-lang/gnulib/lib/posix_memalign.c

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• Hash : 99bbb61c
  Author :
  Date : 2024-10-30T12:47:02
  

  posix_memalign: check for GNU behavior with size 0
  
  * lib/posix_memalign.c: Include stdckdint.h.
  (posix_memalign): Test for overflow more straightforwardly,
  and more portably to unlikely platforms where SIZE_MAX <= INT_MAX.
  Treat a zero size as if it were alignment.
  * m4/posix_memalign.m4 (gl_FUNC_POSIX_MEMALIGN):
  * tests/test-posix_memalign.c (main):
  Test zero size too.  Use volatile to avoid compiler optimizations.
  * modules/posix_memalign (Depends-on): Add stdckdint.
  

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• lib/posix_memalign.c

• /* A posix_memalign() function that works around platform bugs.
     Copyright (C) 2020-2024 Free Software Foundation, Inc.
  
     This file is free software: you can redistribute it and/or modify
     it under the terms of the GNU Lesser General Public License as
     published by the Free Software Foundation; either version 2.1 of the
     License, or (at your option) any later version.
  
     This file 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 Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include <stdlib.h>
  
  #include <errno.h>
  #include <stdckdint.h>
  
  int
  posix_memalign (void **memptr, size_t alignment, size_t size)
  #undef posix_memalign
  {
    /* Round SIZE up to the next multiple of ALIGNMENT.
       However, treat a zero size as if it were ALIGNMENT.  */
    size_t aligned_size;
    if (ckd_add (&aligned_size, size, alignment - !!size))
      return ENOMEM;
    aligned_size &= -alignment;
    return posix_memalign (memptr, alignment, aligned_size);
  }
  

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