lib/malloc.c

   1 /* malloc() function that is glibc compatible.
   2
   3    Copyright (C) 1997-1998, 2006-2007, 2009-2024 Free Software Foundation, Inc.
   4
   5    This file is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    This file 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
  13    GNU Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 /* written by Jim Meyering and Bruno Haible */
  19
  20 /* Ensure that we call the system's malloc() below.  */
  21 #define _GL_USE_STDLIB_ALLOC 1
  22 #include <config.h>
  23
  24 #include <stdlib.h>
  25
  26 #include <errno.h>
  27 #include <stdckdint.h>
  28
  29 /* Allocate an N-byte block of memory from the heap, even if N is 0.  */
  30
  31 void *
  32 rpl_malloc (size_t n)
  33 {
  34 #if !HAVE_MALLOC_0_NONNULL
  35   if (n == 0)
  36     n = 1;
  37 #endif
  38
  39 #if !HAVE_MALLOC_PTRDIFF
  40   ptrdiff_t signed_n;
  41   if (ckd_add (&signed_n, n, 0))
  42     {
  43       errno = ENOMEM;
  44       return NULL;
  45     }
  46 #endif
  47
  48   void *result = malloc (n);
  49
  50 #if !HAVE_MALLOC_POSIX
  51   if (result == NULL)
  52     errno = ENOMEM;
  53 #endif
  54
  55   return result;
  56 }