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/*
x.movscn.c - implementation of the elfx_movscn(3) function.
Copyright (C) 1995 - 2001, 2003 Michael Riepe <michael@stud.uni-hannover.de>
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <private.h>
#ifndef lint
static const char rcsid[] = "@(#) $Id: x.movscn.c,v 1.10 2003/10/09 21:09:51 michael Exp $";
#endif /* lint */
size_t
elfx_movscn(Elf *elf, Elf_Scn *scn, Elf_Scn *after) {
Elf_Scn *prev;
Elf_Scn *tmp;
int off;
if (!elf || !scn || !after) {
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(after->s_magic == SCN_MAGIC);
if (scn->s_elf != elf || after->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;
}
if (scn == after || scn == after->s_link) {
/* nothing to do */
return scn->s_index;
}
/*
* Find previous section.
*/
prev = NULL;
for (tmp = elf->e_scn_1; tmp->s_link; tmp = tmp->s_link) {
if (tmp->s_link == scn) {
prev = tmp;
break;
}
}
elf_assert(prev != NULL);
/*
* Update section indices
*/
off = 0;
for (tmp = elf->e_scn_1; tmp; tmp = tmp->s_link) {
if (off) {
tmp->s_index += off;
}
if (tmp == after) {
off++;
}
else if (tmp == scn) {
off--;
}
}
elf_assert(off == 0);
/*
* Move section.
*/
prev->s_link = scn->s_link;
scn->s_link = after->s_link;
after->s_link = scn;
scn->s_index = after->s_index + 1;
if (elf->e_scn_n == scn) {
elf->e_scn_n = prev;
}
else if (elf->e_scn_n == after) {
elf->e_scn_n = scn;
}
#if ENABLE_DEBUG
/*
* Check section indices
*/
tmp = elf->e_scn_1;
elf_assert(tmp->s_index == 0);
while (tmp->s_link) {
elf_assert(tmp->s_link->s_index == tmp->s_index + 1);
tmp = tmp->s_link;
}
#endif /* ENABLE_DEBUG */
return scn->s_index;
}
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