src/util/cache.c (raw)
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/************************************************************************** * * 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; } |