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* collectd - src/utils_match.c
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* Copyright (C) 2008 Florian octo Forster
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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* Florian octo Forster <octo at verplant.org>
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#include "utils_match.h"
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#define UTILS_MATCH_FLAGS_FREE_USER_DATA 0x01
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int (*callback) (const char *str, char * const *matches, size_t matches_num,
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static char *match_substr (const char *str, int begin, int end)
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if ((begin < 0) || (end < 0) || (begin >= end))
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if (end > (strlen (str) + 1))
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ERROR ("utils_match: match_substr: `end' points after end of string.");
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ret_len = end - begin;
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ret = (char *) malloc (sizeof (char) * (ret_len + 1));
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ERROR ("utils_match: match_substr: malloc failed.");
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sstrncpy (ret, str + begin, ret_len + 1);
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} /* char *match_substr */
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static int default_callback (const char *str,
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char * const *matches, size_t matches_num, void *user_data)
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cu_match_value_t *data = (cu_match_value_t *) user_data;
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if (data->ds_type & UTILS_MATCH_DS_TYPE_GAUGE)
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value = strtod (matches[1], &endptr);
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if (matches[1] == endptr)
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if ((data->values_num == 0)
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|| (data->ds_type & UTILS_MATCH_CF_GAUGE_LAST))
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data->value.gauge = value;
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else if (data->ds_type & UTILS_MATCH_CF_GAUGE_AVERAGE)
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double f = ((double) data->values_num)
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/ ((double) (data->values_num + 1));
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data->value.gauge = (data->value.gauge * f) + (value * (1.0 - f));
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else if (data->ds_type & UTILS_MATCH_CF_GAUGE_MIN)
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if (data->value.gauge > value)
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data->value.gauge = value;
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else if (data->ds_type & UTILS_MATCH_CF_GAUGE_MAX)
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if (data->value.gauge < value)
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data->value.gauge = value;
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ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
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else if (data->ds_type & UTILS_MATCH_DS_TYPE_COUNTER)
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if (data->ds_type & UTILS_MATCH_CF_COUNTER_INC)
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data->value.counter++;
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value = strtoll (matches[1], &endptr, 0);
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if (matches[1] == endptr)
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if (data->ds_type & UTILS_MATCH_CF_COUNTER_SET)
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data->value.counter = value;
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else if (data->ds_type & UTILS_MATCH_CF_COUNTER_ADD)
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data->value.counter += value;
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ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
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ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
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} /* int default_callback */
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cu_match_t *match_create_callback (const char *regex,
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int (*callback) (const char *str,
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char * const *matches, size_t matches_num, void *user_data),
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DEBUG ("utils_match: match_create_callback: regex = %s", regex);
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obj = (cu_match_t *) malloc (sizeof (cu_match_t));
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memset (obj, '\0', sizeof (cu_match_t));
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status = regcomp (&obj->regex, regex, REG_EXTENDED);
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ERROR ("Compiling the regular expression \"%s\" failed.", regex);
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obj->callback = callback;
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obj->user_data = user_data;
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} /* cu_match_t *match_create_callback */
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cu_match_t *match_create_simple (const char *regex, int match_ds_type)
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cu_match_value_t *user_data;
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user_data = (cu_match_value_t *) malloc (sizeof (cu_match_value_t));
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if (user_data == NULL)
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memset (user_data, '\0', sizeof (cu_match_value_t));
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user_data->ds_type = match_ds_type;
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obj = match_create_callback (regex, default_callback, user_data);
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obj->flags |= UTILS_MATCH_FLAGS_FREE_USER_DATA;
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} /* cu_match_t *match_create_simple */
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void match_destroy (cu_match_t *obj)
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if (obj->flags & UTILS_MATCH_FLAGS_FREE_USER_DATA)
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sfree (obj->user_data);
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} /* void match_destroy */
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int match_apply (cu_match_t *obj, const char *str)
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regmatch_t re_match[32];
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if ((obj == NULL) || (str == NULL))
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status = regexec (&obj->regex, str,
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STATIC_ARRAY_SIZE (re_match), re_match,
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/* Regex did not match */
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memset (matches, '\0', sizeof (matches));
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for (matches_num = 0; matches_num < STATIC_ARRAY_SIZE (matches); matches_num++)
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if ((re_match[matches_num].rm_so < 0)
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|| (re_match[matches_num].rm_eo < 0))
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matches[matches_num] = match_substr (str,
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re_match[matches_num].rm_so, re_match[matches_num].rm_eo);
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if (matches[matches_num] == NULL)
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ERROR ("utils_match: match_apply: match_substr failed.");
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status = obj->callback (str, matches, matches_num, obj->user_data);
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ERROR ("utils_match: match_apply: callback failed.");
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for (i = 0; i < matches_num; i++)
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} /* int match_apply */
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void *match_get_user_data (cu_match_t *obj)
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return (obj->user_data);
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} /* void *match_get_user_data */
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/* vim: set sw=2 sts=2 ts=8 : */