/*

nextscn.c - implementation of the elf_nextscn(3) function.

Copyright (C) 1995 - 1998 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

#include <private.h>

#ifndef lint

static const char rcsid[] = "@(#) $Id: nextscn.c,v 1.6 2005/05/21 15:39:25 michael Exp $";

#endif /* lint */

Elf_Scn*

elf_nextscn(Elf *elf, Elf_Scn *scn) {

    if (!elf) {

	return NULL;

    }

    elf_assert(elf->e_magic == ELF_MAGIC);

    if (scn) {

	elf_assert(scn->s_magic == SCN_MAGIC);

	if (scn->s_elf == elf) {

	    return scn->s_link;

	}

	seterr(ERROR_ELFSCNMISMATCH);

    }

    else if (elf->e_kind != ELF_K_ELF) {

	seterr(ERROR_NOTELF);

    }

    else if (elf->e_ehdr || _elf_cook(elf)) {

	elf_assert(elf->e_ehdr);

	for (scn = elf->e_scn_1; scn; scn = scn->s_link) {

	    elf_assert(scn->s_magic == SCN_MAGIC);

	    elf_assert(scn->s_elf == elf);

	    if (scn->s_index == 1) {

		return scn;

	    }

	}

	seterr(ERROR_NOSUCHSCN);

    }

    return NULL;

}