openrc/src/librc/librc-stringlist.c

/*
   librc-strlist.h
   String list functions to make using queue(3) a little easier.
   */

/*
 * Copyright 2007-2008 Roy Marples
 * All rights reserved

 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "librc.h"

RC_STRINGLIST *rc_stringlist_new(void)
{
	RC_STRINGLIST *l = xmalloc(sizeof(*l));
	TAILQ_INIT(l);
	return l;
}

RC_STRING *rc_stringlist_add (RC_STRINGLIST *list, const char *value)
{
	RC_STRING *s = xmalloc(sizeof(*s));

	s->value = xstrdup(value);
	TAILQ_INSERT_TAIL(list, s, entries);
	return s;
}
librc_hidden_def(rc_stringlist_add)

RC_STRING *rc_stringlist_addu (RC_STRINGLIST *list, const char *value)
{
	RC_STRING *s;

	TAILQ_FOREACH(s, list, entries)
		if (strcmp(s->value, value) == 0) {
			errno = EEXIST;
			return NULL;
		}

	return rc_stringlist_add(list, value);
}
librc_hidden_def(rc_stringlist_addu)

bool rc_stringlist_delete(RC_STRINGLIST *list, const char *value)
{
	RC_STRING *s;

	TAILQ_FOREACH(s, list, entries)
		if (strcmp(s->value, value) == 0) {
			TAILQ_REMOVE(list, s, entries);
			free (s->value);
			free (s);
			return true;
		}

	errno = EEXIST;
	return false;
}
librc_hidden_def(rc_stringlist_delete)

void rc_stringlist_sort(RC_STRINGLIST **list)
{
	RC_STRINGLIST *l = *list;
	RC_STRINGLIST *new = rc_stringlist_new();
	RC_STRING *s;
	RC_STRING *sn;
	RC_STRING *n;
	RC_STRING *last;

	TAILQ_FOREACH_SAFE(s, l, entries, sn) {
		TAILQ_REMOVE(l, s, entries);
		last = NULL;
		TAILQ_FOREACH (n, new, entries) {
			if (strcmp (s->value, n->value) < 0)
				break;
			last = n;
		}
		if (last)
			TAILQ_INSERT_AFTER(new, last, s, entries);
		else
			TAILQ_INSERT_HEAD(new, s, entries);
	}

	/* Now we've sorted the list, copy across the new head */
	free(l);
	*list = new;
}
librc_hidden_def(rc_stringlist_sort)

void rc_stringlist_free(RC_STRINGLIST *list)
{
	RC_STRING *s1; 
	RC_STRING *s2;

	if (!list)
		return;

	s1 = TAILQ_FIRST(list);
	while (s1) {
		s2 = TAILQ_NEXT(s1, entries);
		free(s1->value);
		free(s1);
		s1 = s2;
	}
	free(list);
}
librc_hidden_def(rc_stringlist_free)