1 /* Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
2  *
3  * Redistribution and use in source and binary forms, with or without
4  * modification, are permitted provided that the following conditions are
5  * met:
6  *     * Redistributions of source code must retain the above copyright
7  *       notice, this list of conditions and the following disclaimer.
8  *     * Redistributions in binary form must reproduce the above
9  *       copyright notice, this list of conditions and the following
10  *       disclaimer in the documentation and/or other materials provided
11  *       with the distribution.
12  *     * Neither the name of The Linux Foundation, nor the names of its
13  *       contributors may be used to endorse or promote products derived
14  *       from this software without specific prior written permission.
15  *
16  * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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24  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
25  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
26  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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28  */
29 
30 #define LOG_NDEBUG 0
31 #define LOG_TAG "LocSvc_utils_cfg"
32 
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <pthread.h>
36 #include <string.h>
37 #include <ctype.h>
38 #include <unistd.h>
39 #include <time.h>
40 #include <loc_cfg.h>
41 #include <platform_lib_includes.h>
42 #include <loc_misc_utils.h>
43 #ifdef USE_GLIB
44 #include <glib.h>
45 #endif
46 #include "platform_lib_includes.h"
47 
48 /*=============================================================================
49  *
50  *                          GLOBAL DATA DECLARATION
51  *
52  *============================================================================*/
53 
54 /* Parameter data */
55 static uint32_t DEBUG_LEVEL = 0xff;
56 static uint32_t TIMESTAMP = 0;
57 
58 /* Parameter spec table */
59 static const loc_param_s_type loc_param_table[] =
60 {
61     {"DEBUG_LEVEL",    &DEBUG_LEVEL, NULL,    'n'},
62     {"TIMESTAMP",      &TIMESTAMP,   NULL,    'n'},
63 };
64 static const int loc_param_num = sizeof(loc_param_table) / sizeof(loc_param_s_type);
65 
66 typedef struct loc_param_v_type
67 {
68     char* param_name;
69     char* param_str_value;
70     int param_int_value;
71     double param_double_value;
72 }loc_param_v_type;
73 
74 /*===========================================================================
75 FUNCTION loc_set_config_entry
76 
77 DESCRIPTION
78    Potentially sets a given configuration table entry based on the passed in
79    configuration value. This is done by using a string comparison of the
80    parameter names and those found in the configuration file.
81 
82 PARAMETERS:
83    config_entry: configuration entry in the table to possibly set
84    config_value: value to store in the entry if the parameter names match
85 
86 DEPENDENCIES
87    N/A
88 
89 RETURN VALUE
90    None
91 
92 SIDE EFFECTS
93    N/A
94 ===========================================================================*/
loc_set_config_entry(const loc_param_s_type * config_entry,loc_param_v_type * config_value)95 int loc_set_config_entry(const loc_param_s_type* config_entry, loc_param_v_type* config_value)
96 {
97     int ret=-1;
98     if(NULL == config_entry || NULL == config_value)
99     {
100         LOC_LOGE("%s: INVALID config entry or parameter", __FUNCTION__);
101         return ret;
102     }
103 
104     if (strcmp(config_entry->param_name, config_value->param_name) == 0 &&
105         config_entry->param_ptr)
106     {
107         switch (config_entry->param_type)
108         {
109         case 's':
110             if (strcmp(config_value->param_str_value, "NULL") == 0)
111             {
112                 *((char*)config_entry->param_ptr) = '\0';
113             }
114             else {
115                 strlcpy((char*) config_entry->param_ptr,
116                         config_value->param_str_value,
117                         LOC_MAX_PARAM_STRING + 1);
118             }
119             /* Log INI values */
120             LOC_LOGD("%s: PARAM %s = %s", __FUNCTION__,
121                      config_entry->param_name, (char*)config_entry->param_ptr);
122 
123             if(NULL != config_entry->param_set)
124             {
125                 *(config_entry->param_set) = 1;
126             }
127             ret = 0;
128             break;
129         case 'n':
130             *((int *)config_entry->param_ptr) = config_value->param_int_value;
131             /* Log INI values */
132             LOC_LOGD("%s: PARAM %s = %d", __FUNCTION__,
133                      config_entry->param_name, config_value->param_int_value);
134 
135             if(NULL != config_entry->param_set)
136             {
137                 *(config_entry->param_set) = 1;
138             }
139             ret = 0;
140             break;
141         case 'f':
142             *((double *)config_entry->param_ptr) = config_value->param_double_value;
143             /* Log INI values */
144             LOC_LOGD("%s: PARAM %s = %f", __FUNCTION__,
145                      config_entry->param_name, config_value->param_double_value);
146 
147             if(NULL != config_entry->param_set)
148             {
149                 *(config_entry->param_set) = 1;
150             }
151             ret = 0;
152             break;
153         default:
154             LOC_LOGE("%s: PARAM %s parameter type must be n, f, or s",
155                      __FUNCTION__, config_entry->param_name);
156         }
157     }
158     return ret;
159 }
160 
161 /*===========================================================================
162 FUNCTION loc_fill_conf_item
163 
164 DESCRIPTION
165    Takes a line of configuration item and sets defined values based on
166    the passed in configuration table. This table maps strings to values to
167    set along with the type of each of these values.
168 
169 PARAMETERS:
170    input_buf : buffer contanis config item
171    config_table: table definition of strings to places to store information
172    table_length: length of the configuration table
173 
174 DEPENDENCIES
175    N/A
176 
177 RETURN VALUE
178    0: Number of records in the config_table filled with input_buf
179 
180 SIDE EFFECTS
181    N/A
182 ===========================================================================*/
loc_fill_conf_item(char * input_buf,const loc_param_s_type * config_table,uint32_t table_length)183 int loc_fill_conf_item(char* input_buf,
184                        const loc_param_s_type* config_table, uint32_t table_length)
185 {
186     int ret = 0;
187 
188     if (input_buf && config_table) {
189         char *lasts;
190         loc_param_v_type config_value;
191         memset(&config_value, 0, sizeof(config_value));
192 
193         /* Separate variable and value */
194         config_value.param_name = strtok_r(input_buf, "=", &lasts);
195         /* skip lines that do not contain "=" */
196         if (config_value.param_name) {
197             config_value.param_str_value = strtok_r(NULL, "=", &lasts);
198 
199             /* skip lines that do not contain two operands */
200             if (config_value.param_str_value) {
201                 /* Trim leading and trailing spaces */
202                 loc_util_trim_space(config_value.param_name);
203                 loc_util_trim_space(config_value.param_str_value);
204 
205                 /* Parse numerical value */
206                 if ((strlen(config_value.param_str_value) >=3) &&
207                     (config_value.param_str_value[0] == '0') &&
208                     (tolower(config_value.param_str_value[1]) == 'x'))
209                 {
210                     /* hex */
211                     config_value.param_int_value = (int) strtol(&config_value.param_str_value[2],
212                                                                 (char**) NULL, 16);
213                 }
214                 else {
215                     config_value.param_double_value = (double) atof(config_value.param_str_value); /* float */
216                     config_value.param_int_value = atoi(config_value.param_str_value); /* dec */
217                 }
218 
219                 for(uint32_t i = 0; NULL != config_table && i < table_length; i++)
220                 {
221                     if(!loc_set_config_entry(&config_table[i], &config_value)) {
222                         ret += 1;
223                     }
224                 }
225             }
226         }
227     }
228 
229     return ret;
230 }
231 
232 /*===========================================================================
233 FUNCTION loc_read_conf_r (repetitive)
234 
235 DESCRIPTION
236    Reads the specified configuration file and sets defined values based on
237    the passed in configuration table. This table maps strings to values to
238    set along with the type of each of these values.
239    The difference between this and loc_read_conf is that this function returns
240    the file pointer position at the end of filling a config table. Also, it
241    reads a fixed number of parameters at a time which is equal to the length
242    of the configuration table. This functionality enables the caller to
243    repeatedly call the function to read data from the same file.
244 
245 PARAMETERS:
246    conf_fp : file pointer
247    config_table: table definition of strings to places to store information
248    table_length: length of the configuration table
249 
250 DEPENDENCIES
251    N/A
252 
253 RETURN VALUE
254    0: Table filled successfully
255    1: No more parameters to read
256   -1: Error filling table
257 
258 SIDE EFFECTS
259    N/A
260 ===========================================================================*/
loc_read_conf_r(FILE * conf_fp,const loc_param_s_type * config_table,uint32_t table_length)261 int loc_read_conf_r(FILE *conf_fp, const loc_param_s_type* config_table, uint32_t table_length)
262 {
263     int ret=0;
264 
265     unsigned int num_params=table_length;
266     if(conf_fp == NULL) {
267         LOC_LOGE("%s:%d]: ERROR: File pointer is NULL\n", __func__, __LINE__);
268         ret = -1;
269         goto err;
270     }
271 
272     /* Clear all validity bits */
273     for(uint32_t i = 0; NULL != config_table && i < table_length; i++)
274     {
275         if(NULL != config_table[i].param_set)
276         {
277             *(config_table[i].param_set) = 0;
278         }
279     }
280 
281     char input_buf[LOC_MAX_PARAM_LINE];  /* declare a char array */
282 
283     LOC_LOGD("%s:%d]: num_params: %d\n", __func__, __LINE__, num_params);
284     while(num_params)
285     {
286         if(!fgets(input_buf, LOC_MAX_PARAM_LINE, conf_fp)) {
287             LOC_LOGD("%s:%d]: fgets returned NULL\n", __func__, __LINE__);
288             break;
289         }
290 
291         num_params -= loc_fill_conf_item(input_buf, config_table, table_length);
292     }
293 
294 err:
295     return ret;
296 }
297 
298 /*===========================================================================
299 FUNCTION loc_udpate_conf
300 
301 DESCRIPTION
302    Parses the passed in buffer for configuration items, and update the table
303    that is also passed in.
304 
305 Reads the specified configuration file and sets defined values based on
306    the passed in configuration table. This table maps strings to values to
307    set along with the type of each of these values.
308 
309 PARAMETERS:
310    conf_data: configuration items in bufferas a string
311    length: strlen(conf_data)
312    config_table: table definition of strings to places to store information
313    table_length: length of the configuration table
314 
315 DEPENDENCIES
316    N/A
317 
318 RETURN VALUE
319    number of the records in the table that is updated at time of return.
320 
321 SIDE EFFECTS
322    N/A
323 ===========================================================================*/
loc_update_conf(const char * conf_data,int32_t length,const loc_param_s_type * config_table,uint32_t table_length)324 int loc_update_conf(const char* conf_data, int32_t length,
325                     const loc_param_s_type* config_table, uint32_t table_length)
326 {
327     int ret = -1;
328 
329     if (conf_data && length && config_table && table_length) {
330         // make a copy, so we do not tokenize the original data
331         char* conf_copy = (char*)malloc(length+1);
332 
333         if (conf_copy != NULL)
334         {
335             memcpy(conf_copy, conf_data, length);
336             // we hard NULL the end of string to be safe
337             conf_copy[length] = 0;
338 
339             // start with one record off
340             uint32_t num_params = table_length - 1;
341             char* saveptr = NULL;
342             char* input_buf = strtok_r(conf_copy, "\n", &saveptr);
343             ret = 0;
344 
345             LOC_LOGD("%s:%d]: num_params: %d\n", __func__, __LINE__, num_params);
346             while(num_params && input_buf) {
347                 ret++;
348                 num_params -= loc_fill_conf_item(input_buf, config_table, table_length);
349                 input_buf = strtok_r(NULL, "\n", &saveptr);
350             }
351             free(conf_copy);
352         }
353     }
354 
355     return ret;
356 }
357 
358 /*===========================================================================
359 FUNCTION loc_read_conf
360 
361 DESCRIPTION
362    Reads the specified configuration file and sets defined values based on
363    the passed in configuration table. This table maps strings to values to
364    set along with the type of each of these values.
365 
366 PARAMETERS:
367    conf_file_name: configuration file to read
368    config_table: table definition of strings to places to store information
369    table_length: length of the configuration table
370 
371 DEPENDENCIES
372    N/A
373 
374 RETURN VALUE
375    None
376 
377 SIDE EFFECTS
378    N/A
379 ===========================================================================*/
loc_read_conf(const char * conf_file_name,const loc_param_s_type * config_table,uint32_t table_length)380 void loc_read_conf(const char* conf_file_name, const loc_param_s_type* config_table,
381                    uint32_t table_length)
382 {
383     FILE *conf_fp = NULL;
384     char *lasts;
385     loc_param_v_type config_value;
386     uint32_t i;
387 
388     if((conf_fp = fopen(conf_file_name, "r")) != NULL)
389     {
390         LOC_LOGD("%s: using %s", __FUNCTION__, conf_file_name);
391         if(table_length && config_table) {
392             loc_read_conf_r(conf_fp, config_table, table_length);
393             rewind(conf_fp);
394         }
395         loc_read_conf_r(conf_fp, loc_param_table, loc_param_num);
396         fclose(conf_fp);
397     }
398     /* Initialize logging mechanism with parsed data */
399     loc_logger_init(DEBUG_LEVEL, TIMESTAMP);
400 }
401