/*
 * libdpkg - Debian packaging suite library routines
 * pkg.c - primitives for pkg handling
 *
 * Copyright © 1995, 1996 Ian Jackson <ian@chiark.greenend.org.uk>
 * Copyright © 2009 Guillem Jover <guillem@debian.org>
 *
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <config.h>
#include <compat.h>

#include <string.h>

#include <dpkg/dpkg-db.h>
#include <dpkg/pkg.h>

void
pkgbin_blank(struct pkgbin *pkgbin)
{
	pkgbin->essential = false;
	pkgbin->depends = NULL;
	pkgbin->depended = NULL;
	pkgbin->description = NULL;
	pkgbin->maintainer = NULL;
	pkgbin->source = NULL;
	pkgbin->installedsize = NULL;
	pkgbin->bugs = NULL;
	pkgbin->origin = NULL;
	pkgbin->arch = NULL;
	blankversion(&pkgbin->version);
	pkgbin->conffiles = NULL;
	pkgbin->arbs = NULL;
}

void
pkg_blank(struct pkginfo *pkg)
{
	pkg->name = NULL;
	pkg->status = stat_notinstalled;
	pkg->eflag = eflag_ok;
	pkg->want = want_unknown;
	pkg->priority = pri_unknown;
	pkg->otherpriority = NULL;
	pkg->section = NULL;
	blankversion(&pkg->configversion);
	pkg->files = NULL;
	pkg->clientdata = NULL;
	pkg->trigaw.head = NULL;
	pkg->trigaw.tail = NULL;
	pkg->othertrigaw_head = NULL;
	pkg->trigpend_head = NULL;
	pkgbin_blank(&pkg->installed);
	pkgbin_blank(&pkg->available);
}

static int
nes(const char *s)
{
	return s && *s;
}

/**
 * Check if a pkg is informative.
 *
 * Used by dselect and dpkg query options as an aid to decide whether to
 * display things, and by dump to decide whether to write them out.
 */
bool
pkg_is_informative(struct pkginfo *pkg, struct pkgbin *pkgbin)
{
	/* We ignore Section and Priority, as these tend to hang around. */
	if (pkgbin == &pkg->installed &&
	    (pkg->want != want_unknown ||
	     pkg->eflag != eflag_ok ||
	     pkg->status != stat_notinstalled ||
	     informativeversion(&pkg->configversion)))
		return true;

	if (pkgbin->depends ||
	    nes(pkgbin->description) ||
	    nes(pkgbin->maintainer) ||
	    nes(pkgbin->origin) ||
	    nes(pkgbin->bugs) ||
	    nes(pkgbin->installedsize) ||
	    nes(pkgbin->source) ||
	    informativeversion(&pkgbin->version) ||
	    pkgbin->conffiles ||
	    pkgbin->arbs)
		return true;

	return false;
}

/**
 * Compare a package to be sorted by name.
 *
 * @param a A pointer of a pointer to a struct pkginfo.
 * @param b A pointer of a pointer to a struct pkginfo.
 *
 * @return An integer with the result of the comparison.
 * @retval -1 a is earlier than b.
 * @retval 0 a is equal to b.
 * @retval 1 a is later than b.
 */
int
pkg_sorter_by_name(const void *a, const void *b)
{
	const struct pkginfo *pa = *(const struct pkginfo **)a;
	const struct pkginfo *pb = *(const struct pkginfo **)b;

	return strcmp(pa->name, pb->name);
}