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/*
x.remscn.c - implementation of the elfx_remscn(3) function.
Copyright (C) 1995 - 2001, 2003 Michael Riepe
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <private.h>
#ifndef lint
static const char rcsid[] = "@(#) $Id: x.remscn.c,v 1.15 2008/05/23 08:15:35 michael Exp $";
#endif /* lint */
size_t
elfx_remscn(Elf *elf, Elf_Scn *scn) {
Elf_Scn *pscn;
Scn_Data *sd;
Scn_Data *tmp;
size_t index;
if (!elf || !scn) {
return SHN_UNDEF;
}
elf_assert(elf->e_magic == ELF_MAGIC);
if (elf->e_kind != ELF_K_ELF) {
seterr(ERROR_NOTELF);
return SHN_UNDEF;
}
elf_assert(scn->s_magic == SCN_MAGIC);
elf_assert(elf->e_ehdr);
if (scn->s_elf != elf) {
seterr(ERROR_ELFSCNMISMATCH);
return SHN_UNDEF;
}
elf_assert(elf->e_scn_1);
if (scn == elf->e_scn_1) {
seterr(ERROR_NULLSCN);
return SHN_UNDEF;
}
/*
* Find previous section.
*/
for (pscn = elf->e_scn_1; pscn->s_link; pscn = pscn->s_link) {
if (pscn->s_link == scn) {
break;
}
}
if (pscn->s_link != scn) {
seterr(ERROR_ELFSCNMISMATCH);
return SHN_UNDEF;
}
/*
* Unlink section.
*/
if (elf->e_scn_n == scn) {
elf->e_scn_n = pscn;
}
pscn->s_link = scn->s_link;
index = scn->s_index;
/*
* Free section descriptor and data.
*/
for (sd = scn->s_data_1; sd; sd = tmp) {
elf_assert(sd->sd_magic == DATA_MAGIC);
elf_assert(sd->sd_scn == scn);
tmp = sd->sd_link;
if (sd->sd_free_data && sd->sd_memdata) {
free(sd->sd_memdata);
}
if (sd->sd_freeme) {
free(sd);
}
}
if ((sd = scn->s_rawdata)) {
elf_assert(sd->sd_magic == DATA_MAGIC);
elf_assert(sd->sd_scn == scn);
if (sd->sd_free_data && sd->sd_memdata) {
free(sd->sd_memdata);
}
if (sd->sd_freeme) {
free(sd);
}
}
if (scn->s_freeme) {
elf_assert(scn->s_index > 0);
free(scn);
}
/*
* Adjust section indices.
*/
for (scn = pscn->s_link; scn; scn = scn->s_link) {
elf_assert(scn->s_index > index);
scn->s_index--;
}
/*
* Adjust section count in ELF header
*/
if (_elf_update_shnum(elf, elf->e_scn_n->s_index + 1)) {
return SHN_UNDEF;
}
return index;
}
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