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/*
* Copyright (C) 2003-2009 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program 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 program 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "songvec.h"
#include "song.h"
#include "tag.h"
#include <glib.h>
#include <assert.h>
#include <string.h>
#include <stdlib.h>
static GMutex *nr_lock = NULL;
/**
* Compare two tag values which should contain an integer value
* (e.g. disc or track number). Either one may be NULL.
*/
static int
compare_number_string(const char *a, const char *b)
{
long ai = a == NULL ? 0 : strtol(a, NULL, 10);
long bi = b == NULL ? 0 : strtol(b, NULL, 10);
if (ai <= 0)
return bi <= 0 ? 0 : -1;
if (bi <= 0)
return 1;
return ai - bi;
}
static int
compare_tag_item(const struct tag *a, const struct tag *b, enum tag_type type)
{
if (a == NULL)
return b == NULL ? 0 : -1;
if (b == NULL)
return 1;
return compare_number_string(tag_get_value(a, type),
tag_get_value(b, type));
}
/* Only used for sorting/searchin a songvec, not general purpose compares */
static int songvec_cmp(const void *s1, const void *s2)
{
const struct song *a = ((const struct song * const *)s1)[0];
const struct song *b = ((const struct song * const *)s2)[0];
int ret;
/* first sort by disc */
ret = compare_tag_item(a->tag, b->tag, TAG_DISC);
if (ret != 0)
return ret;
/* then by track number */
ret = compare_tag_item(a->tag, b->tag, TAG_TRACK);
if (ret != 0)
return ret;
/* still no difference? compare file name */
return g_utf8_collate(a->uri, b->uri);
}
static size_t sv_size(const struct songvec *sv)
{
return sv->nr * sizeof(struct song *);
}
void songvec_init(void)
{
g_assert(nr_lock == NULL);
nr_lock = g_mutex_new();
}
void songvec_deinit(void)
{
g_assert(nr_lock != NULL);
g_mutex_free(nr_lock);
nr_lock = NULL;
}
void songvec_sort(struct songvec *sv)
{
g_mutex_lock(nr_lock);
qsort(sv->base, sv->nr, sizeof(struct song *), songvec_cmp);
g_mutex_unlock(nr_lock);
}
struct song *
songvec_find(const struct songvec *sv, const char *uri)
{
int i;
struct song *ret = NULL;
g_mutex_lock(nr_lock);
for (i = sv->nr; --i >= 0; ) {
if (strcmp(sv->base[i]->uri, uri))
continue;
ret = sv->base[i];
break;
}
g_mutex_unlock(nr_lock);
return ret;
}
int
songvec_delete(struct songvec *sv, const struct song *del)
{
size_t i;
g_mutex_lock(nr_lock);
for (i = 0; i < sv->nr; ++i) {
if (sv->base[i] != del)
continue;
/* we _don't_ call song_free() here */
if (!--sv->nr) {
g_free(sv->base);
sv->base = NULL;
} else {
memmove(&sv->base[i], &sv->base[i + 1],
(sv->nr - i) * sizeof(struct song *));
sv->base = g_realloc(sv->base, sv_size(sv));
}
g_mutex_unlock(nr_lock);
return i;
}
g_mutex_unlock(nr_lock);
return -1; /* not found */
}
void
songvec_add(struct songvec *sv, struct song *add)
{
g_mutex_lock(nr_lock);
++sv->nr;
sv->base = g_realloc(sv->base, sv_size(sv));
sv->base[sv->nr - 1] = add;
g_mutex_unlock(nr_lock);
}
void songvec_destroy(struct songvec *sv)
{
g_mutex_lock(nr_lock);
sv->nr = 0;
g_mutex_unlock(nr_lock);
g_free(sv->base);
sv->base = NULL;
}
int
songvec_for_each(const struct songvec *sv,
int (*fn)(struct song *, void *), void *arg)
{
size_t i;
size_t prev_nr;
g_mutex_lock(nr_lock);
for (i = 0; i < sv->nr; ) {
struct song *song = sv->base[i];
assert(song);
assert(*song->uri);
prev_nr = sv->nr;
g_mutex_unlock(nr_lock); /* fn() may block */
if (fn(song, arg) < 0)
return -1;
g_mutex_lock(nr_lock); /* sv->nr may change in fn() */
if (prev_nr == sv->nr)
++i;
}
g_mutex_unlock(nr_lock);
return 0;
}
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