2 * collectd - src/meta_data.c
3 * Copyright (C) 2008,2009 Florian octo Forster
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 * Florian octo Forster <octo at verplant.org>
24 #include "meta_data.h"
34 int64_t mv_signed_int;
35 uint64_t mv_unsigned_int;
39 typedef union meta_value_u meta_value_t;
42 typedef struct meta_entry_s meta_entry_t;
60 static char *md_strdup (const char *orig) /* {{{ */
68 sz = strlen (orig) + 1;
69 dest = (char *) malloc (sz);
73 memcpy (dest, orig, sz);
76 } /* }}} char *md_strdup */
78 static meta_entry_t *md_entry_alloc (const char *key) /* {{{ */
82 e = (meta_entry_t *) malloc (sizeof (*e));
85 ERROR ("md_entry_alloc: malloc failed.");
88 memset (e, 0, sizeof (*e));
90 e->key = md_strdup (key);
94 ERROR ("md_entry_alloc: md_strdup failed.");
102 } /* }}} meta_entry_t *md_entry_alloc */
104 static void md_entry_free (meta_entry_t *e) /* {{{ */
111 if (e->type == MD_TYPE_STRING)
112 free (e->value.mv_string);
115 md_entry_free (e->next);
118 } /* }}} void md_entry_free */
120 static int md_entry_insert (meta_data_t *md, meta_entry_t *e) /* {{{ */
125 if ((md == NULL) || (e == NULL))
128 pthread_mutex_lock (&md->lock);
134 if (strcasecmp (e->key, this->key) == 0)
143 /* This key does not exist yet. */
144 if (md->head == NULL)
148 assert (prev != NULL);
154 else /* (this != NULL) */
161 e->next = this->next;
164 pthread_mutex_unlock (&md->lock);
169 md_entry_free (this);
173 } /* }}} int md_entry_insert */
175 /* XXX: The lock on md must be held while calling this function! */
176 static meta_entry_t *md_entry_lookup (meta_data_t *md, /* {{{ */
181 if ((md == NULL) || (key == NULL))
184 for (e = md->head; e != NULL; e = e->next)
185 if (strcasecmp (key, e->key) == 0)
189 } /* }}} meta_entry_t *md_entry_lookup */
194 meta_data_t *meta_data_create (void) /* {{{ */
198 md = (meta_data_t *) malloc (sizeof (*md));
201 ERROR ("meta_data_create: malloc failed.");
204 memset (md, 0, sizeof (*md));
207 pthread_mutex_init (&md->lock, /* attr = */ NULL);
210 } /* }}} meta_data_t *meta_data_create */
212 void meta_data_destroy (meta_data_t *md) /* {{{ */
217 md_entry_free (md->head);
219 } /* }}} void meta_data_destroy */
221 int meta_data_exists (meta_data_t *md, const char *key) /* {{{ */
225 if ((md == NULL) || (key == NULL))
228 pthread_mutex_lock (&md->lock);
230 for (e = md->head; e != NULL; e = e->next)
232 if (strcasecmp (key, e->key) == 0)
234 pthread_mutex_unlock (&md->lock);
239 pthread_mutex_unlock (&md->lock);
241 } /* }}} int meta_data_exists */
243 int meta_data_type (meta_data_t *md, const char *key) /* {{{ */
247 if ((md == NULL) || (key == NULL))
250 pthread_mutex_lock (&md->lock);
252 for (e = md->head; e != NULL; e = e->next)
254 if (strcasecmp (key, e->key) == 0)
256 pthread_mutex_unlock (&md->lock);
261 pthread_mutex_unlock (&md->lock);
263 } /* }}} int meta_data_type */
265 int meta_data_delete (meta_data_t *md, const char *key) /* {{{ */
270 if ((md == NULL) || (key == NULL))
273 pthread_mutex_lock (&md->lock);
279 if (strcasecmp (key, this->key) == 0)
288 pthread_mutex_unlock (&md->lock);
293 md->head = this->next;
295 prev->next = this->next;
297 pthread_mutex_unlock (&md->lock);
300 md_entry_free (this);
303 } /* }}} int meta_data_delete */
308 int meta_data_add_string (meta_data_t *md, /* {{{ */
309 const char *key, const char *value)
313 if ((md == NULL) || (key == NULL) || (value == NULL))
316 e = md_entry_alloc (key);
320 e->value.mv_string = md_strdup (value);
321 if (e->value.mv_string == NULL)
323 ERROR ("meta_data_add_string: md_strdup failed.");
327 e->type = MD_TYPE_STRING;
329 return (md_entry_insert (md, e));
330 } /* }}} int meta_data_add_string */
332 int meta_data_add_signed_int (meta_data_t *md, /* {{{ */
333 const char *key, int64_t value)
337 if ((md == NULL) || (key == NULL))
340 e = md_entry_alloc (key);
344 e->value.mv_signed_int = value;
345 e->type = MD_TYPE_SIGNED_INT;
347 return (md_entry_insert (md, e));
348 } /* }}} int meta_data_add_signed_int */
350 int meta_data_add_unsigned_int (meta_data_t *md, /* {{{ */
351 const char *key, uint64_t value)
355 if ((md == NULL) || (key == NULL))
358 e = md_entry_alloc (key);
362 e->value.mv_unsigned_int = value;
363 e->type = MD_TYPE_UNSIGNED_INT;
365 return (md_entry_insert (md, e));
366 } /* }}} int meta_data_add_unsigned_int */
368 int meta_data_add_double (meta_data_t *md, /* {{{ */
369 const char *key, double value)
373 if ((md == NULL) || (key == NULL))
376 e = md_entry_alloc (key);
380 e->value.mv_double = value;
381 e->type = MD_TYPE_DOUBLE;
383 return (md_entry_insert (md, e));
384 } /* }}} int meta_data_add_double */
386 int meta_data_add_boolean (meta_data_t *md, /* {{{ */
387 const char *key, _Bool value)
391 if ((md == NULL) || (key == NULL))
394 e = md_entry_alloc (key);
398 e->value.mv_boolean = value;
399 e->type = MD_TYPE_BOOLEAN;
401 return (md_entry_insert (md, e));
402 } /* }}} int meta_data_add_boolean */
407 int meta_data_get_string (meta_data_t *md, /* {{{ */
408 const char *key, char **value)
413 if ((md == NULL) || (key == NULL) || (value == NULL))
416 pthread_mutex_lock (&md->lock);
418 e = md_entry_lookup (md, key);
421 pthread_mutex_unlock (&md->lock);
425 if (e->type != MD_TYPE_STRING)
427 ERROR ("meta_data_get_signed_int: Type mismatch for key `%s'", e->key);
428 pthread_mutex_unlock (&md->lock);
432 temp = md_strdup (e->value.mv_string);
435 pthread_mutex_unlock (&md->lock);
436 ERROR ("meta_data_get_string: md_strdup failed.");
440 pthread_mutex_unlock (&md->lock);
445 } /* }}} int meta_data_get_string */
447 int meta_data_get_signed_int (meta_data_t *md, /* {{{ */
448 const char *key, int64_t *value)
452 if ((md == NULL) || (key == NULL) || (value == NULL))
455 pthread_mutex_lock (&md->lock);
457 e = md_entry_lookup (md, key);
460 pthread_mutex_unlock (&md->lock);
464 if (e->type != MD_TYPE_SIGNED_INT)
466 ERROR ("meta_data_get_signed_int: Type mismatch for key `%s'", e->key);
467 pthread_mutex_unlock (&md->lock);
471 *value = e->value.mv_signed_int;
473 pthread_mutex_unlock (&md->lock);
475 } /* }}} int meta_data_get_signed_int */
477 int meta_data_get_unsigned_int (meta_data_t *md, /* {{{ */
478 const char *key, uint64_t *value)
482 if ((md == NULL) || (key == NULL) || (value == NULL))
485 pthread_mutex_lock (&md->lock);
487 e = md_entry_lookup (md, key);
490 pthread_mutex_unlock (&md->lock);
494 if (e->type != MD_TYPE_UNSIGNED_INT)
496 ERROR ("meta_data_get_unsigned_int: Type mismatch for key `%s'", e->key);
497 pthread_mutex_unlock (&md->lock);
501 *value = e->value.mv_unsigned_int;
503 pthread_mutex_unlock (&md->lock);
505 } /* }}} int meta_data_get_unsigned_int */
507 int meta_data_get_double (meta_data_t *md, /* {{{ */
508 const char *key, double *value)
512 if ((md == NULL) || (key == NULL) || (value == NULL))
515 pthread_mutex_lock (&md->lock);
517 e = md_entry_lookup (md, key);
520 pthread_mutex_unlock (&md->lock);
524 if (e->type != MD_TYPE_DOUBLE)
526 ERROR ("meta_data_get_double: Type mismatch for key `%s'", e->key);
527 pthread_mutex_unlock (&md->lock);
531 *value = e->value.mv_double;
533 pthread_mutex_unlock (&md->lock);
535 } /* }}} int meta_data_get_double */
537 int meta_data_get_boolean (meta_data_t *md, /* {{{ */
538 const char *key, _Bool *value)
542 if ((md == NULL) || (key == NULL) || (value == NULL))
545 pthread_mutex_lock (&md->lock);
547 e = md_entry_lookup (md, key);
550 pthread_mutex_unlock (&md->lock);
554 if (e->type != MD_TYPE_BOOLEAN)
556 ERROR ("meta_data_get_boolean: Type mismatch for key `%s'", e->key);
557 pthread_mutex_unlock (&md->lock);
561 *value = e->value.mv_boolean;
563 pthread_mutex_unlock (&md->lock);
565 } /* }}} int meta_data_get_boolean */
567 /* vim: set sw=2 sts=2 et fdm=marker : */