/*+
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x.remscn.c - implementation of the elfx_remscn(3) function.+
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Copyright (C) 1995 - 2001, 2003 Michael Riepe+
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+
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This library is free software; you can redistribute it and/or+
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modify it under the terms of the GNU Library General Public+
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License as published by the Free Software Foundation; either+
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version 2 of the License, or (at your option) any later version.+
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+
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This library is distributed in the hope that it will be useful,+
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but WITHOUT ANY WARRANTY; without even the implied warranty of+
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU+
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Library General Public License for more details.+
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+
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You should have received a copy of the GNU Library General Public+
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License along with this library; if not, write to the Free Software+
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA+
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*/+
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+
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#include <private.h>+
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+
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#ifndef lint+
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static const char rcsid[] = "@(#) $Id: x.remscn.c,v 1.14 2005/05/21 15:39:27 michael Exp $";+
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#endif /* lint */+
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+
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size_t+
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elfx_remscn(Elf *elf, Elf_Scn *scn) {+
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    Elf_Scn *pscn;+
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    Scn_Data *sd;+
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    Scn_Data *tmp;+
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    size_t index;+
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+
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    if (!elf || !scn) {+
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	return SHN_UNDEF;+
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    }+
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    elf_assert(elf->e_magic == ELF_MAGIC);+
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    if (elf->e_kind != ELF_K_ELF) {+
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	seterr(ERROR_NOTELF);+
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	return SHN_UNDEF;+
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    }+
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    elf_assert(scn->s_magic == SCN_MAGIC);+
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    elf_assert(elf->e_ehdr);+
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    if (scn->s_elf != elf) {+
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	seterr(ERROR_ELFSCNMISMATCH);+
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	return SHN_UNDEF;+
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    }+
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    elf_assert(elf->e_scn_1);+
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    if (scn == elf->e_scn_1) {+
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	seterr(ERROR_NULLSCN);+
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	return SHN_UNDEF;+
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    }+
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+
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    /*+
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     * Find previous section.+
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     */+
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    for (pscn = elf->e_scn_1; pscn->s_link; pscn = pscn->s_link) {+
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	if (pscn->s_link == scn) {+
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	    break;+
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	}+
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    }+
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    if (pscn->s_link != scn) {+
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	seterr(ERROR_ELFSCNMISMATCH);+
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	return SHN_UNDEF;+
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    }+
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+
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    /*+
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     * Unlink section.+
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     */+
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    if (elf->e_scn_n == scn) {+
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	elf->e_scn_n = pscn;+
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    }+
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    pscn->s_link = scn->s_link;+
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    index = scn->s_index;+
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+
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    /*+
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     * Free section descriptor and data.+
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     */+
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    for (sd = scn->s_data_1; sd; sd = tmp) {+
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	elf_assert(sd->sd_magic == DATA_MAGIC);+
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	elf_assert(sd->sd_scn == scn);+
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	tmp = sd->sd_link;+
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	if (sd->sd_free_data && sd->sd_memdata) {+
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	    free(sd->sd_memdata);+
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	}+
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	if (sd->sd_freeme) {+
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	    free(sd);+
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	}+
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    }+
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    if ((sd = scn->s_rawdata)) {+
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	elf_assert(sd->sd_magic == DATA_MAGIC);+
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	elf_assert(sd->sd_scn == scn);+
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	if (sd->sd_free_data && sd->sd_memdata) {+
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	    free(sd->sd_memdata);+
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	}+
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	if (sd->sd_freeme) {+
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	    free(sd);+
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	}+
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    }+
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    if (scn->s_freeme) {+
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	elf_assert(scn->s_index > 0);+
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	free(scn);+
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    }+
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+
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    /*+
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     * Adjust section indices.+
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     */+
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    for (scn = pscn->s_link; scn; scn = scn->s_link) {+
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	elf_assert(scn->s_index > index);+
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	scn->s_index--;+
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    }+
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+
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    /*+
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     * Adjust section count in ELF header+
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     */+
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    if (_elf_update_shnum(elf, elf->e_scn_n->s_index + 1)) {+
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	return SHN_UNDEF;+
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    }+
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    return index;+
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}+
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