tint2/src/util/cache.c
2017-04-13 14:07:23 +02:00

160 lines
3.9 KiB
C

/**************************************************************************
*
* Tint2 : cache
*
* Copyright (C) 2016 @o9000
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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 "cache.h"
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "common.h"
void init_cache(Cache *cache)
{
if (cache->_table)
free_cache(cache);
cache->_table = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_free);
cache->dirty = FALSE;
cache->loaded = FALSE;
}
void free_cache(Cache *cache)
{
if (cache->_table)
g_hash_table_destroy(cache->_table);
cache->_table = NULL;
cache->dirty = FALSE;
cache->loaded = FALSE;
}
void load_cache(Cache *cache, const gchar *cache_path)
{
init_cache(cache);
cache->loaded = TRUE;
int fd = open(cache_path, O_RDONLY);
if (fd == -1)
return;
flock(fd, LOCK_SH);
FILE *f = fopen(cache_path, "rt");
if (!f)
goto unlock;
char *line = NULL;
size_t line_size;
while (getline(&line, &line_size, f) >= 0) {
char *key, *value;
size_t line_len = strlen(line);
gboolean has_newline = FALSE;
if (line_len >= 1) {
if (line[line_len - 1] == '\n') {
line[line_len - 1] = '\0';
line_len--;
has_newline = TRUE;
}
}
if (!has_newline)
break;
if (line_len == 0)
continue;
if (parse_line(line, &key, &value)) {
g_hash_table_insert(cache->_table, g_strdup(key), g_strdup(value));
free(key);
free(value);
}
}
free(line);
fclose(f);
unlock:
flock(fd, LOCK_UN);
close(fd);
}
void write_cache_line(gpointer key, gpointer value, gpointer user_data)
{
gchar *k = key;
gchar *v = value;
FILE *f = user_data;
fprintf(f, "%s=%s\n", k, v);
}
void save_cache(Cache *cache, const gchar *cache_path)
{
int fd = open(cache_path, O_RDONLY | O_CREAT, 0600);
if (fd == -1) {
gchar *dir_path = g_path_get_dirname(cache_path);
g_mkdir_with_parents(dir_path, 0700);
g_free(dir_path);
fd = open(cache_path, O_RDONLY | O_CREAT, 0600);
}
if (fd == -1) {
fprintf(stderr, RED "Could not save icon theme cache!" RESET "\n");
return;
}
flock(fd, LOCK_EX);
FILE *f = fopen(cache_path, "w");
if (!f) {
fprintf(stderr, RED "Could not save icon theme cache!" RESET "\n");
goto unlock;
}
g_hash_table_foreach(cache->_table, write_cache_line, f);
fclose(f);
cache->dirty = FALSE;
unlock:
flock(fd, LOCK_UN);
close(fd);
}
const gchar *get_from_cache(Cache *cache, const gchar *key)
{
if (!cache->_table)
return NULL;
return g_hash_table_lookup(cache->_table, key);
}
void add_to_cache(Cache *cache, const gchar *key, const gchar *value)
{
if (!cache->_table)
init_cache(cache);
if (!key || !value)
return;
gchar *old_value = g_hash_table_lookup(cache->_table, key);
if (old_value && g_str_equal(old_value, value))
return;
g_hash_table_insert(cache->_table, g_strdup(key), g_strdup(value));
cache->dirty = TRUE;
}