b4d50a580cdbbb4e5db910c455f5fc8bf0344372
1 /**
2 * collectd - src/utils_match.c
3 * Copyright (C) 2008 Florian octo Forster
4 *
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.
9 *
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.
14 *
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
18 *
19 * Authors:
20 * Florian octo Forster <octo at verplant.org>
21 **/
23 #include "collectd.h"
24 #include "common.h"
25 #include "plugin.h"
27 #include "utils_match.h"
29 #include <regex.h>
31 #define UTILS_MATCH_FLAGS_FREE_USER_DATA 0x01
33 struct cu_match_s
34 {
35 regex_t regex;
36 int flags;
38 int (*callback) (const char *str, void *user_data);
39 void *user_data;
40 };
42 /*
43 * Private functions
44 */
45 static int default_callback (const char *str, void *user_data)
46 {
47 cu_match_value_t *data = (cu_match_value_t *) user_data;
49 if (data->ds_type == UTILS_MATCH_DS_TYPE_GAUGE)
50 {
51 gauge_t value;
52 char *endptr = NULL;
54 value = strtod (str, &endptr);
55 if (str == endptr)
56 return (-1);
58 data->value.gauge = value;
59 }
60 else if ((data->ds_type == UTILS_MATCH_DS_TYPE_COUNTER_SET)
61 || (data->ds_type == UTILS_MATCH_DS_TYPE_COUNTER_ADD))
62 {
63 counter_t value;
64 char *endptr = NULL;
66 value = strtoll (str, &endptr, 0);
67 if (str == endptr)
68 return (-1);
70 if (data->ds_type == UTILS_MATCH_DS_TYPE_COUNTER_SET)
71 data->value.counter = value;
72 else
73 data->value.counter += value;
74 }
75 else if (data->ds_type == UTILS_MATCH_DS_TYPE_COUNTER_INC)
76 {
77 data->value.counter++;
78 }
79 else
80 {
81 return (-1);
82 }
84 return (0);
85 } /* int default_callback */
87 /*
88 * Public functions
89 */
90 cu_match_t *match_create_callback (const char *regex,
91 int (*callback) (const char *str, void *user_data),
92 void *user_data)
93 {
94 cu_match_t *obj;
95 int status;
97 obj = (cu_match_t *) malloc (sizeof (cu_match_t));
98 if (obj == NULL)
99 return (NULL);
100 memset (obj, '\0', sizeof (cu_match_t));
102 status = regcomp (&obj->regex, regex, REG_EXTENDED);
103 if (status != 0)
104 {
105 ERROR ("Compiling the regular expression \"%s\" failed.", regex);
106 sfree (obj);
107 return (NULL);
108 }
110 obj->callback = callback;
111 obj->user_data = user_data;
113 return (obj);
114 } /* cu_match_t *match_create_callback */
116 cu_match_t *match_create_simple (const char *regex, int match_ds_type)
117 {
118 cu_match_value_t *user_data;
119 cu_match_t *obj;
121 user_data = (cu_match_value_t *) malloc (sizeof (cu_match_value_t));
122 if (user_data == NULL)
123 return (NULL);
124 memset (user_data, '\0', sizeof (cu_match_value_t));
126 obj = match_create_callback (regex, default_callback, user_data);
127 if (obj == NULL)
128 {
129 sfree (user_data);
130 return (NULL);
131 }
133 obj->flags |= UTILS_MATCH_FLAGS_FREE_USER_DATA;
135 return (obj);
136 } /* cu_match_t *match_create_simple */
138 void match_destroy (cu_match_t *obj)
139 {
140 if (obj == NULL)
141 return;
143 if (obj->flags & UTILS_MATCH_FLAGS_FREE_USER_DATA)
144 {
145 sfree (obj->user_data);
146 }
148 sfree (obj);
149 } /* void match_destroy */
151 int match_apply (cu_match_t *obj, const char *str)
152 {
153 int status;
154 regmatch_t re_match;
155 char *sub_match;
156 size_t sub_match_len;
158 if ((obj == NULL) || (str == NULL))
159 return (-1);
161 re_match.rm_so = -1;
162 re_match.rm_eo = -1;
164 status = regexec (&obj->regex, str, /* nmatch = */ 1, &re_match,
165 /* eflags = */ 0);
167 /* Regex did not match */
168 if (status != 0)
169 return (0);
171 if (re_match.rm_so < 0)
172 {
173 status = obj->callback (str, obj->user_data);
174 return (status);
175 }
177 assert (re_match.rm_so < re_match.rm_eo);
178 sub_match_len = (size_t) (re_match.rm_eo - re_match.rm_so);
179 sub_match = (char *) malloc (sizeof (char) * (sub_match_len + 1));
180 if (sub_match == NULL)
181 {
182 ERROR ("malloc failed.");
183 return (-1);
184 }
185 sstrncpy (sub_match, str + re_match.rm_so, sub_match_len + 1);
187 status = obj->callback (sub_match, obj->user_data);
189 sfree (sub_match);
191 return (status);
192 } /* int match_apply */
194 void *match_get_user_data (cu_match_t *obj)
195 {
196 if (obj == NULL)
197 return (NULL);
198 return (obj->user_data);
199 } /* void *match_get_user_data */
201 /* vim: set sw=2 sts=2 ts=8 : */