2 * collectd - src/utils_fbhash.c
3 * Copyright (C) 2009 Florian octo Forster
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
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9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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21 * DEALINGS IN THE SOFTWARE.
24 * Florian octo Forster <octo at collectd.org>
32 #include "utils_fbhash.h"
33 #include "utils_avltree.h"
47 static void fbh_free_tree (c_avl_tree_t *tree) /* {{{ */
59 status = c_avl_pick (tree, (void *) &key, (void *) &value);
68 } /* }}} void fbh_free_tree */
70 static int fbh_read_file (fbhash_t *h) /* {{{ */
78 fh = fopen (h->filename, "r");
82 memset (&fl, 0, sizeof (fl));
84 fl.l_whence = SEEK_SET;
86 fl.l_len = 0; /* == entire file */
87 /* TODO: Lock file? -> fcntl */
89 status = fcntl (fileno (fh), F_SETLK, &fl);
96 tree = c_avl_create ((void *) strcmp);
103 /* Read `fh' into `tree' */
104 while (fgets (buffer, sizeof (buffer), fh) != NULL) /* {{{ */
113 buffer[sizeof (buffer) - 1] = 0;
114 len = strlen (buffer);
116 /* Remove trailing newline characters. */
118 && ((buffer[len - 1] == '\n') || (buffer[len - 1] == '\r')))
124 /* Seek first non-space character */
126 while ((*key != 0) && isspace ((int) *key))
129 /* Skip empty lines and comments */
130 if ((key[0] == 0) || (key[0] == '#'))
133 /* Seek first colon */
134 value = strchr (key, ':');
138 /* Null-terminate `key'. */
142 /* Skip leading whitespace */
143 while ((*value != 0) && isspace ((int) *value))
146 /* Skip lines without value */
150 key_copy = strdup (key);
151 value_copy = strdup (value);
153 if ((key_copy == NULL) || (value_copy == NULL))
160 status = c_avl_insert (tree, key_copy, value_copy);
168 DEBUG ("utils_fbhash: fbh_read_file: key = %s; value = %s;",
170 } /* }}} while (fgets) */
174 fbh_free_tree (h->tree);
178 } /* }}} int fbh_read_file */
180 static int fbh_check_file (fbhash_t *h) /* {{{ */
185 memset (&statbuf, 0, sizeof (statbuf));
187 status = stat (h->filename, &statbuf);
191 if (h->mtime >= statbuf.st_mtime)
194 status = fbh_read_file (h);
196 h->mtime = statbuf.st_mtime;
199 } /* }}} int fbh_check_file */
204 fbhash_t *fbh_create (const char *file) /* {{{ */
212 h = malloc (sizeof (*h));
215 memset (h, 0, sizeof (*h));
217 h->filename = strdup (file);
218 if (h->filename == NULL)
225 pthread_mutex_init (&h->lock, /* attr = */ NULL);
227 status = fbh_check_file (h);
235 } /* }}} fbhash_t *fbh_create */
237 void fbh_destroy (fbhash_t *h) /* {{{ */
242 pthread_mutex_destroy (&h->lock);
244 fbh_free_tree (h->tree);
245 } /* }}} void fbh_destroy */
247 char *fbh_get (fbhash_t *h, const char *key) /* {{{ */
253 if ((h == NULL) || (key == NULL))
259 pthread_mutex_lock (&h->lock);
261 /* TODO: Checking this every time may be a bit much..? */
264 status = c_avl_get (h->tree, key, (void *) &value);
267 assert (value != NULL);
268 value_copy = strdup (value);
271 pthread_mutex_unlock (&h->lock);
274 } /* }}} char *fbh_get */
276 /* vim: set sw=2 sts=2 et fdm=marker : */