2 * collectd - src/utils_match.c
3 * Copyright (C) 2008 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; either version 2 of the License, or (at your
8 * option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * Florian octo Forster <octo at verplant.org>
27 #include "utils_match.h"
31 #define UTILS_MATCH_FLAGS_FREE_USER_DATA 0x01
38 int (*callback) (const char *str, void *user_data);
45 static int default_callback (const char *str, void *user_data)
47 cu_match_value_t *data = (cu_match_value_t *) user_data;
49 if (data->ds_type & UTILS_MATCH_DS_TYPE_GAUGE)
54 value = strtod (str, &endptr);
58 if ((data->values_num == 0)
59 || (data->ds_type & UTILS_MATCH_CF_GAUGE_LAST))
61 data->value.gauge = value;
63 else if (data->ds_type & UTILS_MATCH_CF_GAUGE_AVERAGE)
65 double f = ((double) data->values_num)
66 / ((double) (data->values_num + 1));
67 data->value.gauge = (data->value.gauge * f) + (value * (1.0 - f));
69 else if (data->ds_type & UTILS_MATCH_CF_GAUGE_MIN)
71 if (data->value.gauge > value)
72 data->value.gauge = value;
74 else if (data->ds_type & UTILS_MATCH_CF_GAUGE_MAX)
76 if (data->value.gauge < value)
77 data->value.gauge = value;
81 ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
87 else if (data->ds_type & UTILS_MATCH_DS_TYPE_COUNTER)
92 if (data->ds_type & UTILS_MATCH_CF_COUNTER_INC)
94 data->value.counter++;
99 value = strtoll (str, &endptr, 0);
103 if (data->ds_type & UTILS_MATCH_CF_COUNTER_SET)
104 data->value.counter = value;
105 else if (data->ds_type & UTILS_MATCH_CF_COUNTER_ADD)
106 data->value.counter += value;
109 ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
117 ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
122 } /* int default_callback */
127 cu_match_t *match_create_callback (const char *regex,
128 int (*callback) (const char *str, void *user_data),
134 DEBUG ("utils_match: match_create_callback: regex = %s", regex);
136 obj = (cu_match_t *) malloc (sizeof (cu_match_t));
139 memset (obj, '\0', sizeof (cu_match_t));
141 status = regcomp (&obj->regex, regex, REG_EXTENDED);
144 ERROR ("Compiling the regular expression \"%s\" failed.", regex);
149 obj->callback = callback;
150 obj->user_data = user_data;
153 } /* cu_match_t *match_create_callback */
155 cu_match_t *match_create_simple (const char *regex, int match_ds_type)
157 cu_match_value_t *user_data;
160 user_data = (cu_match_value_t *) malloc (sizeof (cu_match_value_t));
161 if (user_data == NULL)
163 memset (user_data, '\0', sizeof (cu_match_value_t));
164 user_data->ds_type = match_ds_type;
166 obj = match_create_callback (regex, default_callback, user_data);
173 obj->flags |= UTILS_MATCH_FLAGS_FREE_USER_DATA;
176 } /* cu_match_t *match_create_simple */
178 void match_destroy (cu_match_t *obj)
183 if (obj->flags & UTILS_MATCH_FLAGS_FREE_USER_DATA)
185 sfree (obj->user_data);
189 } /* void match_destroy */
191 int match_apply (cu_match_t *obj, const char *str)
194 regmatch_t re_match[2];
196 size_t sub_match_len;
198 if ((obj == NULL) || (str == NULL))
201 re_match[0].rm_so = -1;
202 re_match[0].rm_eo = -1;
203 re_match[1].rm_so = -1;
204 re_match[1].rm_eo = -1;
205 status = regexec (&obj->regex, str, /* nmatch = */ 2, re_match,
208 /* Regex did not match */
212 /* re_match[0] is the location of the entire match.
213 * re_match[1] is the location of the sub-match. */
214 if (re_match[1].rm_so < 0)
216 status = obj->callback (str, obj->user_data);
220 assert (re_match[1].rm_so < re_match[1].rm_eo);
221 sub_match_len = (size_t) (re_match[1].rm_eo - re_match[1].rm_so);
222 sub_match = (char *) malloc (sizeof (char) * (sub_match_len + 1));
223 if (sub_match == NULL)
225 ERROR ("malloc failed.");
228 sstrncpy (sub_match, str + re_match[1].rm_so, sub_match_len + 1);
230 DEBUG ("utils_match: match_apply: Dispatching substring \"%s\" to "
231 "callback.", sub_match);
232 status = obj->callback (sub_match, obj->user_data);
237 } /* int match_apply */
239 void *match_get_user_data (cu_match_t *obj)
243 return (obj->user_data);
244 } /* void *match_get_user_data */
246 /* vim: set sw=2 sts=2 ts=8 : */