1  /* Multiple versions of memmem.
       2     Copyright (C) 2018-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library 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 GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <ifunc-memmem.h>
      20  
      21  #if HAVE_MEMMEM_IFUNC
      22  # define memmem __redirect_memmem
      23  # define __memmem __redirect___memmem
      24  # include <string.h>
      25  # include <ifunc-resolve.h>
      26  # undef memmem
      27  # undef __memmem
      28  
      29  # if HAVE_MEMMEM_C
      30  extern __typeof (__redirect_memmem) MEMMEM_C attribute_hidden;
      31  # endif
      32  
      33  # if HAVE_MEMMEM_Z13
      34  extern __typeof (__redirect_memmem) MEMMEM_Z13 attribute_hidden;
      35  # endif
      36  
      37  # if HAVE_MEMMEM_ARCH13
      38  extern __typeof (__redirect_memmem) MEMMEM_ARCH13 attribute_hidden;
      39  # endif
      40  
      41  s390_libc_ifunc_expr (__redirect_memmem, __memmem,
      42  		      (HAVE_MEMMEM_ARCH13 && (hwcap & HWCAP_S390_VXRS_EXT2))
      43  		      ? MEMMEM_ARCH13
      44  		      : (HAVE_MEMMEM_Z13 && (hwcap & HWCAP_S390_VX))
      45  		      ? MEMMEM_Z13
      46  		      : MEMMEM_DEFAULT
      47  		      )
      48  weak_alias (__memmem, memmem)
      49  #endif