text: /* realloc() function that is glibc compatible.
  
     Copyright (C) 1997, 2003-2004, 2006-2007, 2009-2019 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/>.  */
  
  /* written by Jim Meyering and Bruno Haible */
  
  #define _GL_USE_STDLIB_ALLOC 1
  #include <config.h>
  
  /* Only the AC_FUNC_REALLOC macro defines 'realloc' already in config.h.  */
  #ifdef realloc
  # define NEED_REALLOC_GNU 1
  /* Whereas the gnulib module 'realloc-gnu' defines HAVE_REALLOC_GNU.  */
  #elif GNULIB_REALLOC_GNU && !HAVE_REALLOC_GNU
  # define NEED_REALLOC_GNU 1
  #endif
  
  /* Infer the properties of the system's malloc function.
     The gnulib module 'malloc-gnu' defines HAVE_MALLOC_GNU.  */
  #if GNULIB_MALLOC_GNU && HAVE_MALLOC_GNU
  # define SYSTEM_MALLOC_GLIBC_COMPATIBLE 1
  #endif
  
  #include <stdlib.h>
  
  #include <errno.h>
  
  /* Change the size of an allocated block of memory P to N bytes,
     with error checking.  If N is zero, change it to 1.  If P is NULL,
     use malloc.  */
  
  void *
  rpl_realloc (void *p, size_t n)
  {
    void *result;
  
  #if NEED_REALLOC_GNU
    if (n == 0)
      {
        n = 1;
  
        /* In theory realloc might fail, so don't rely on it to free.  */
        free (p);
        p = NULL;
      }
  #endif
  
    if (p == NULL)
      {
  #if GNULIB_REALLOC_GNU && !NEED_REALLOC_GNU && !SYSTEM_MALLOC_GLIBC_COMPATIBLE
        if (n == 0)
          n = 1;
  #endif
        result = malloc (n);
      }
    else
      result = realloc (p, n);
  
  #if !HAVE_REALLOC_POSIX
    if (result == NULL)
      errno = ENOMEM;
  #endif
  
    return result;
  }
  