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/* Get section at specific index.
Copyright (C) 2005, 2008 Red Hat, Inc.
This file is part of elfutils.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2005.
This file is free software; you can redistribute it and/or modify
it under the terms of either
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at
your option) any later version
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at
your option) any later version
or both in parallel, as here.
elfutils is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <assert.h>
#include <stddef.h>
#include <stdlib.h>
#include "libelfP.h"
#ifndef LIBELFBITS
# define LIBELFBITS 32
#endif
Elf_Scn *
elfw2(LIBELFBITS,offscn) (elf, offset)
Elf *elf;
ElfW2(LIBELFBITS,Off) offset;
{
if (elf == NULL)
return NULL;
if (unlikely (elf->kind != ELF_K_ELF))
{
__libelf_seterrno (ELF_E_INVALID_HANDLE);
return NULL;
}
Elf_ScnList *runp = &elf->state.ELFW(elf,LIBELFBITS).scns;
/* If we have not looked at section headers before,
we might need to read them in first. */
if (runp->cnt > 0
&& unlikely (runp->data[0].shdr.ELFW(e,LIBELFBITS) == NULL)
&& unlikely (elfw2(LIBELFBITS,getshdr) (&runp->data[0]) == NULL))
return NULL;
rwlock_rdlock (elf->lock);
Elf_Scn *result = NULL;
/* Find the section in the list. */
while (1)
{
for (unsigned int i = 0; i < runp->cnt; ++i)
if (runp->data[i].shdr.ELFW(e,LIBELFBITS)->sh_offset == offset)
{
result = &runp->data[i];
/* If this section is empty, the following one has the same
sh_offset. We presume the caller is looking for a nonempty
section, so keep looking if this one is empty. */
if (runp->data[i].shdr.ELFW(e,LIBELFBITS)->sh_size != 0
&& runp->data[i].shdr.ELFW(e,LIBELFBITS)->sh_type != SHT_NOBITS)
goto out;
}
runp = runp->next;
if (runp == NULL)
{
__libelf_seterrno (ELF_E_INVALID_OFFSET);
break;
}
}
out:
rwlock_unlock (elf->lock);
return result;
}
INTDEF(elfw2(LIBELFBITS,offscn))
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