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       1                 :             : /* Get the section index of the extended section index table.
       2                 :             :    Copyright (C) 2007 Red Hat, Inc.
       3                 :             :    Copyright (C) 2025 Mark J. Wielaard <mark@klomp.org>
       4                 :             :    This file is part of elfutils.
       5                 :             :    Contributed by Ulrich Drepper <drepper@redhat.com>, 2007.
       6                 :             : 
       7                 :             :    This file is free software; you can redistribute it and/or modify
       8                 :             :    it under the terms of either
       9                 :             : 
      10                 :             :      * the GNU Lesser General Public License as published by the Free
      11                 :             :        Software Foundation; either version 3 of the License, or (at
      12                 :             :        your option) any later version
      13                 :             : 
      14                 :             :    or
      15                 :             : 
      16                 :             :      * the GNU General Public License as published by the Free
      17                 :             :        Software Foundation; either version 2 of the License, or (at
      18                 :             :        your option) any later version
      19                 :             : 
      20                 :             :    or both in parallel, as here.
      21                 :             : 
      22                 :             :    elfutils is distributed in the hope that it will be useful, but
      23                 :             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      24                 :             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      25                 :             :    General Public License for more details.
      26                 :             : 
      27                 :             :    You should have received copies of the GNU General Public License and
      28                 :             :    the GNU Lesser General Public License along with this program.  If
      29                 :             :    not, see <http://www.gnu.org/licenses/>.  */
      30                 :             : 
      31                 :             : #ifdef HAVE_CONFIG_H
      32                 :             : # include <config.h>
      33                 :             : #endif
      34                 :             : 
      35                 :             : #include "libelfP.h"
      36                 :             : 
      37                 :             : 
      38                 :             : int
      39                 :          96 : elf_scnshndx (Elf_Scn *scn)
      40                 :             : {
      41                 :          96 :   size_t scnndx;
      42                 :          96 :   GElf_Shdr shdr_mem;
      43                 :          96 :   GElf_Shdr *shdr;
      44                 :          96 :   Elf *elf;
      45                 :          96 :   Elf_Scn *nscn;
      46                 :             : 
      47         [ +  - ]:          96 :   if (scn == NULL)
      48                 :             :     return -1;
      49                 :             : 
      50                 :          96 :   scnndx = scn->index;
      51                 :          96 :   elf = scn->elf;
      52                 :             : 
      53                 :          96 :   shdr = gelf_getshdr (scn, &shdr_mem);
      54         [ +  - ]:          96 :   if (shdr == NULL)
      55                 :             :     return -1;
      56                 :             : 
      57                 :             :   /* Only SYMTAB sections can have a SHNDX section.  */
      58         [ +  + ]:          96 :   if (shdr->sh_type != SHT_SYMTAB)
      59                 :             :     return 0;
      60                 :             : 
      61                 :             :   /* By convention the SHT_SYMTAB_SHNDX section is right after the the
      62                 :             :      SHT_SYMTAB section, so start there.  */
      63                 :             :   nscn = scn;
      64         [ +  + ]:         116 :   while ((nscn = elf_nextscn (elf, nscn)) != NULL)
      65                 :             :     {
      66                 :          68 :       shdr = gelf_getshdr (nscn, &shdr_mem);
      67         [ +  - ]:          68 :       if (shdr == NULL)
      68                 :             :         return -1;
      69                 :             : 
      70   [ +  +  +  - ]:          68 :       if (shdr->sh_type == SHT_SYMTAB_SHNDX && shdr->sh_link == scnndx)
      71                 :          20 :         return nscn->index;
      72                 :             :     }
      73                 :             : 
      74                 :             :   /* OK, not found, start from the top.  */
      75                 :             :   nscn = NULL;
      76                 :        3744 :   while ((nscn = elf_nextscn (elf, nscn)) != NULL
      77   [ -  +  +  + ]:        1872 :          && nscn->index != scnndx)
      78                 :             :     {
      79                 :        1824 :       shdr = gelf_getshdr (nscn, &shdr_mem);
      80         [ +  - ]:        1824 :       if (shdr == NULL)
      81                 :             :         return -1;
      82                 :             : 
      83   [ -  +  -  - ]:        1824 :       if (shdr->sh_type == SHT_SYMTAB_SHNDX && shdr->sh_link == scnndx)
      84                 :           0 :         return nscn->index;
      85                 :             :     }
      86                 :             : 
      87                 :             :   /* No shndx found, but no errors.  */
      88                 :             :   return 0;
      89                 :             : }
      90                 :             : INTDEF(elf_scnshndx)