Blame tools/sequence.c

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/*
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  File: sequence.c
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  (Linux Access Control List Management)
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  Copyright (C) 1999, 2000
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  Andreas Gruenbacher, <a.gruenbacher@bestbits.at>
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  This program is free software; you can redistribute it and/or
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  modify it under the terms of the GNU Lesser General Public
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  License as published by the Free Software Foundation; either
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  version 2.1 of the License, or (at your option) any later version.
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  This program 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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  Lesser General Public License for more details.
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  You should have received a copy of the GNU Lesser 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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#include "config.h"
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#include <stdlib.h>
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#include "sequence.h"
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cmd_t
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cmd_init(
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	void)
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{
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	cmd_t cmd;
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	cmd = malloc(sizeof(struct cmd_obj));
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	if (cmd) {
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		cmd->c_tag = ACL_UNDEFINED_TAG;
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		cmd->c_perm = 0;
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	}
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	return cmd;
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}
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void
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cmd_free(
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	cmd_t cmd)
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{
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	free(cmd);
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}
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seq_t
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seq_init(
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	void)
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{
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	seq_t seq = (seq_t)malloc(sizeof(struct seq_obj));
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	if (seq == NULL)
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		return NULL;
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	seq->s_first = seq->s_last = NULL;
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	return seq;
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}
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int
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seq_free(
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	seq_t seq)
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{
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	cmd_t cmd = seq->s_first;
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	while (cmd) {
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		seq->s_first = seq->s_first->c_next;
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		cmd_free(cmd);
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		cmd = seq->s_first;
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	}
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	free(seq);
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	return 0;
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}
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int
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seq_empty(
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	seq_t seq)
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{
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	return (seq->s_first == NULL);
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}
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int
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seq_append(
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	seq_t seq,
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	cmd_t cmd)
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{
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	cmd->c_next = NULL;
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	if (seq->s_first == NULL) {
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		seq->s_first = seq->s_last = cmd;
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	} else {
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		seq->s_last->c_next = cmd;
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		seq->s_last = cmd;
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	}
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	return 0;
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}
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int
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seq_append_cmd(
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	seq_t seq,
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	cmd_tag_t cmd,
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	acl_type_t type)
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{
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	cmd_t cmd_d = cmd_init();
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	if (cmd_d == NULL)
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		return -1;
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	cmd_d->c_cmd = cmd;
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	cmd_d->c_type = type;
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	if (seq_append(seq, cmd_d) != 0) {
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		cmd_free(cmd_d);
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		return -1;
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	}
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	return 0;
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}
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int
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seq_get_cmd(
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	seq_t seq,
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	int which,
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	cmd_t *cmd)
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{
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	if (which == SEQ_FIRST_CMD) {
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		if (seq->s_first == NULL)
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			return 0;
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		if (cmd)
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			*cmd = seq->s_first;
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		return 1;
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	} else if (which == SEQ_NEXT_CMD) {
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		if (cmd == NULL)
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			return -1;
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		if (*cmd) {
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			*cmd = (*cmd)->c_next;
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			return (*cmd == NULL) ? 0 : 1;
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		}
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		return 0;
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	} else {
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		return -1;
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	}
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}
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int
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seq_delete_cmd(
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	seq_t seq,
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	cmd_t cmd)
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{
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	cmd_t prev = seq->s_first;
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	if (cmd == seq->s_first) {
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		seq->s_first = seq->s_first->c_next;
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		cmd_free(cmd);
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		return 0;
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	}
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	while (prev != NULL && prev->c_next != cmd)
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		prev = prev->c_next;
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	if (prev == NULL)
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		return -1;
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	if (cmd == seq->s_last)
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		seq->s_last = prev;
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	prev->c_next = cmd->c_next;
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	cmd_free(cmd);
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	return 0;
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}
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