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       1                 :            : /* Advance in archive to next element.
       2                 :            :    Copyright (C) 1998-2009, 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_Cmd
      42                 :      13978 : elf_next (Elf *elf)
      43                 :            : {
      44                 :      13978 :   Elf *parent;
      45                 :      13978 :   Elf_Cmd ret;
      46                 :            : 
      47                 :            :   /* Be gratious, the specs demand it.  */
      48   [ +  -  -  + ]:      13978 :   if (elf == NULL || elf->parent == NULL)
      49                 :            :     return ELF_C_NULL;
      50                 :            : 
      51                 :            :   /* We can be sure the parent is an archive.  */
      52                 :      13978 :   parent = elf->parent;
      53         [ -  + ]:      13978 :   assert (parent->kind == ELF_K_AR);
      54                 :            : 
      55                 :      13978 :   rwlock_wrlock (parent->lock);
      56                 :            : 
      57                 :            :   /* Now advance the offset.  */
      58                 :      13978 :   parent->state.ar.offset += (sizeof (struct ar_hdr)
      59                 :      13978 :                               + ((parent->state.ar.elf_ar_hdr.ar_size + 1)
      60                 :      13978 :                                  & ~1l));
      61                 :            : 
      62                 :            :   /* Get the next archive header.  */
      63         [ +  + ]:      13978 :   ret = __libelf_next_arhdr_wrlock (parent) != 0 ? ELF_C_NULL : elf->cmd;
      64                 :            : 
      65                 :            :   /* If necessary, mark the archive header as unusable.  */
      66         [ -  + ]:      13940 :   if (ret == ELF_C_NULL)
      67                 :         38 :     parent->state.ar.elf_ar_hdr.ar_name = NULL;
      68                 :            : 
      69                 :            :   rwlock_unlock (parent->lock);
      70                 :            : 
      71                 :            :   return ret;
      72                 :            : }