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       1                 :            : /* Get next section.
       2                 :            :    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2015 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            :    Contributed by Ulrich Drepper <drepper@redhat.com>, 1998.
       5                 :            : 
       6                 :            :    This file is free software; you can redistribute it and/or modify
       7                 :            :    it under the terms of either
       8                 :            : 
       9                 :            :      * the GNU Lesser General Public License as published by the Free
      10                 :            :        Software Foundation; either version 3 of the License, or (at
      11                 :            :        your option) any later version
      12                 :            : 
      13                 :            :    or
      14                 :            : 
      15                 :            :      * the GNU General Public License as published by the Free
      16                 :            :        Software Foundation; either version 2 of the License, or (at
      17                 :            :        your option) any later version
      18                 :            : 
      19                 :            :    or both in parallel, as here.
      20                 :            : 
      21                 :            :    elfutils is distributed in the hope that it will be useful, but
      22                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      23                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24                 :            :    General Public License for more details.
      25                 :            : 
      26                 :            :    You should have received copies of the GNU General Public License and
      27                 :            :    the GNU Lesser General Public License along with this program.  If
      28                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      29                 :            : 
      30                 :            : #ifdef HAVE_CONFIG_H
      31                 :            : # include <config.h>
      32                 :            : #endif
      33                 :            : 
      34                 :            : #include <assert.h>
      35                 :            : #include <libelf.h>
      36                 :            : #include <stddef.h>
      37                 :            : 
      38                 :            : #include "libelfP.h"
      39                 :            : 
      40                 :            : 
      41                 :            : Elf_Scn *
      42                 :    9425903 : elf_nextscn (Elf *elf, Elf_Scn *scn)
      43                 :            : {
      44                 :    9425903 :   Elf_ScnList *list;
      45                 :    9425903 :   Elf_Scn *result = NULL;
      46                 :            : 
      47         [ +  - ]:    9425903 :   if (elf == NULL)
      48                 :            :     return NULL;
      49                 :            : 
      50                 :    9425903 :   rwlock_rdlock (elf->lock);
      51                 :            : 
      52         [ +  + ]:    9425903 :   if (scn == NULL)
      53                 :            :     {
      54                 :            :       /* If no section handle is given return the first (not 0th) section.
      55                 :            :          Set scn to the 0th section and perform nextscn.  */
      56                 :      39304 :       if (elf->class == ELFCLASS32
      57                 :            :            || (offsetof (Elf, state.elf32.scns)
      58                 :            :                == offsetof (Elf, state.elf64.scns)))
      59                 :      39304 :         list = &elf->state.elf32.scns;
      60                 :            :       else
      61                 :            :         list = &elf->state.elf64.scns;
      62                 :            : 
      63                 :      39304 :       scn = &list->data[0];
      64                 :            :     }
      65                 :            :   else
      66                 :    9386599 :     list = scn->list;
      67                 :            : 
      68         [ +  + ]:    9425903 :   if (scn + 1 < &list->data[list->cnt])
      69                 :            :     result = scn + 1;
      70         [ +  + ]:      25362 :   else if (scn + 1 == &list->data[list->max]
      71         [ +  + ]:      24350 :            && (list = list->next) != NULL)
      72                 :            :     {
      73                 :            :       /* If there is another element in the section list it must
      74                 :            :          have at least one entry.  */
      75         [ -  + ]:        778 :       assert (list->cnt > 0);
      76                 :        778 :       result = &list->data[0];
      77                 :            :     }
      78                 :            : 
      79                 :            :   rwlock_unlock (elf->lock);
      80                 :            : 
      81                 :            :   return result;
      82                 :            : }
      83                 :            : INTDEF(elf_nextscn)