2 * collectd - src/utils_match.c
3 * Copyright (C) 2008 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"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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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>
31 #include "utils_match.h"
35 #define UTILS_MATCH_FLAGS_FREE_USER_DATA 0x01
36 #define UTILS_MATCH_FLAGS_EXCLUDE_REGEX 0x02
44 int (*callback) (const char *str, char * const *matches, size_t matches_num,
52 static char *match_substr (const char *str, int begin, int end)
57 if ((begin < 0) || (end < 0) || (begin >= end))
59 if ((size_t) end > (strlen (str) + 1))
61 ERROR ("utils_match: match_substr: `end' points after end of string.");
65 ret_len = end - begin;
66 ret = (char *) malloc (sizeof (char) * (ret_len + 1));
69 ERROR ("utils_match: match_substr: malloc failed.");
73 sstrncpy (ret, str + begin, ret_len + 1);
75 } /* char *match_substr */
77 static int default_callback (const char __attribute__((unused)) *str,
78 char * const *matches, size_t matches_num, void *user_data)
80 cu_match_value_t *data = (cu_match_value_t *) user_data;
82 if (data->ds_type & UTILS_MATCH_DS_TYPE_GAUGE)
90 value = (gauge_t) strtod (matches[1], &endptr);
91 if (matches[1] == endptr)
94 if ((data->values_num == 0)
95 || (data->ds_type & UTILS_MATCH_CF_GAUGE_LAST))
97 data->value.gauge = value;
99 else if (data->ds_type & UTILS_MATCH_CF_GAUGE_AVERAGE)
101 double f = ((double) data->values_num)
102 / ((double) (data->values_num + 1));
103 data->value.gauge = (data->value.gauge * f) + (value * (1.0 - f));
105 else if (data->ds_type & UTILS_MATCH_CF_GAUGE_MIN)
107 if (data->value.gauge > value)
108 data->value.gauge = value;
110 else if (data->ds_type & UTILS_MATCH_CF_GAUGE_MAX)
112 if (data->value.gauge < value)
113 data->value.gauge = value;
117 ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
123 else if (data->ds_type & UTILS_MATCH_DS_TYPE_COUNTER)
128 if (data->ds_type & UTILS_MATCH_CF_COUNTER_INC)
130 data->value.counter++;
138 value = (counter_t) strtoull (matches[1], &endptr, 0);
139 if (matches[1] == endptr)
142 if (data->ds_type & UTILS_MATCH_CF_COUNTER_SET)
143 data->value.counter = value;
144 else if (data->ds_type & UTILS_MATCH_CF_COUNTER_ADD)
145 data->value.counter += value;
148 ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
154 else if (data->ds_type & UTILS_MATCH_DS_TYPE_DERIVE)
159 if (data->ds_type & UTILS_MATCH_CF_DERIVE_INC)
161 data->value.counter++;
169 value = (derive_t) strtoll (matches[1], &endptr, 0);
170 if (matches[1] == endptr)
173 if (data->ds_type & UTILS_MATCH_CF_DERIVE_SET)
174 data->value.derive = value;
175 else if (data->ds_type & UTILS_MATCH_CF_DERIVE_ADD)
176 data->value.derive += value;
179 ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
185 else if (data->ds_type & UTILS_MATCH_DS_TYPE_ABSOLUTE)
193 value = (absolute_t) strtoull (matches[1], &endptr, 0);
194 if (matches[1] == endptr)
197 if (data->ds_type & UTILS_MATCH_CF_ABSOLUTE_SET)
198 data->value.absolute = value;
201 ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
209 ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
214 } /* int default_callback */
219 cu_match_t *match_create_callback (const char *regex, const char *excluderegex,
220 int (*callback) (const char *str,
221 char * const *matches, size_t matches_num, void *user_data),
227 DEBUG ("utils_match: match_create_callback: regex = %s, excluderegex = %s",
228 regex, excluderegex);
230 obj = (cu_match_t *) malloc (sizeof (cu_match_t));
233 memset (obj, '\0', sizeof (cu_match_t));
235 status = regcomp (&obj->regex, regex, REG_EXTENDED | REG_NEWLINE);
238 ERROR ("Compiling the regular expression \"%s\" failed.", regex);
243 if (excluderegex && strcmp(excluderegex, "") != 0) {
244 status = regcomp (&obj->excluderegex, excluderegex, REG_EXTENDED);
247 ERROR ("Compiling the excluding regular expression \"%s\" failed.",
252 obj->flags |= UTILS_MATCH_FLAGS_EXCLUDE_REGEX;
255 obj->callback = callback;
256 obj->user_data = user_data;
259 } /* cu_match_t *match_create_callback */
261 cu_match_t *match_create_simple (const char *regex,
262 const char *excluderegex, int match_ds_type)
264 cu_match_value_t *user_data;
267 user_data = (cu_match_value_t *) malloc (sizeof (cu_match_value_t));
268 if (user_data == NULL)
270 memset (user_data, '\0', sizeof (cu_match_value_t));
271 user_data->ds_type = match_ds_type;
273 obj = match_create_callback (regex, excluderegex,
274 default_callback, user_data);
281 obj->flags |= UTILS_MATCH_FLAGS_FREE_USER_DATA;
284 } /* cu_match_t *match_create_simple */
286 void match_destroy (cu_match_t *obj)
291 if (obj->flags & UTILS_MATCH_FLAGS_FREE_USER_DATA)
293 sfree (obj->user_data);
297 } /* void match_destroy */
299 int match_apply (cu_match_t *obj, const char *str)
302 regmatch_t re_match[32];
307 if ((obj == NULL) || (str == NULL))
310 if (obj->flags & UTILS_MATCH_FLAGS_EXCLUDE_REGEX) {
311 status = regexec (&obj->excluderegex, str,
312 STATIC_ARRAY_SIZE (re_match), re_match,
314 /* Regex did match, so exclude this line */
316 DEBUG("ExludeRegex matched, don't count that line\n");
321 status = regexec (&obj->regex, str,
322 STATIC_ARRAY_SIZE (re_match), re_match,
325 /* Regex did not match */
329 memset (matches, '\0', sizeof (matches));
330 for (matches_num = 0; matches_num < STATIC_ARRAY_SIZE (matches); matches_num++)
332 if ((re_match[matches_num].rm_so < 0)
333 || (re_match[matches_num].rm_eo < 0))
336 matches[matches_num] = match_substr (str,
337 re_match[matches_num].rm_so, re_match[matches_num].rm_eo);
338 if (matches[matches_num] == NULL)
347 ERROR ("utils_match: match_apply: match_substr failed.");
351 status = obj->callback (str, matches, matches_num, obj->user_data);
354 ERROR ("utils_match: match_apply: callback failed.");
358 for (i = 0; i < matches_num; i++)
364 } /* int match_apply */
366 void *match_get_user_data (cu_match_t *obj)
370 return (obj->user_data);
371 } /* void *match_get_user_data */
373 /* vim: set sw=2 sts=2 ts=8 : */