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#include <gpiod.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "utils.h"
static char configFilename[] = "celnetmon.cfg";
char *listStrDataNames[] = {
"path_to_serial_port", "path_to_gpio_chip", "mqtt_url",
"network_apn", "mqtt_username", "mqtt_password",
"mqtt_root_topic", "network_username", "network_password",
"network_auth"};
char *listIntDataNames[] = {"pin_pwr_key", "pin_status", "mqtt_port",
"network_operator"};
int checkPinVal(char *pathToChip, int pinNum) {
int pinVal = -1;
struct gpiod_chip *chip;
struct gpiod_line *line;
chip = gpiod_chip_open(pathToChip);
if (!chip) {
perror("Error opening GPIO chip");
return -1;
}
line = gpiod_chip_get_line(chip, pinNum);
if (!line) {
perror("Error getting GPIO line");
gpiod_chip_close(chip);
return -1;
}
if (gpiod_line_request_input(line, "pin status") < 0) {
perror("Error setting GPIO line as input");
gpiod_chip_close(chip);
return -1;
}
pinVal = gpiod_line_get_value(line);
if (pinVal < 0) {
perror("Error getting GPIO line value");
gpiod_chip_close(chip);
return -1;
}
gpiod_chip_close(chip);
return pinVal;
}
int readCfg(listCfgData *cfgData, const char *pathExe) {
char lineBuffer[BUFSIZ];
char *pathCfg, *pathDirEnd, *tmpPtr = NULL;
int sizePathDir, idx, idx2;
unsigned long numCharRead;
FILE *fileCfg;
/* Form config filepath string. */
pathDirEnd = strrchr(pathExe, '/');
sizePathDir = pathDirEnd - pathExe;
if (pathDirEnd == NULL) {
printf("Cannot obtain the executable directory.\n");
return 1;
}
pathCfg = malloc(sizeof(char) * (sizePathDir + strlen(configFilename) + 2));
strncpy(pathCfg, pathExe, sizePathDir + 1);
strcat(pathCfg, configFilename);
/* Open the config file. */
fileCfg = fopen(pathCfg, "r");
if (fileCfg == NULL) {
printf("Cannot open config file \"%s\".\n", pathCfg);
free(pathCfg);
return 1;
}
/* Check that it is not empty. */
if (fgets(lineBuffer, BUFSIZ, fileCfg) == NULL) {
printf("Config file is empty.\n");
fclose(fileCfg);
free(pathCfg);
return 1;
}
/* Allocate memory for the config data list. */
cfgData->strDataList = malloc(STR_LIST_LENGTH * sizeof(strData));
cfgData->intDataList = malloc(INT_LIST_LENGTH * sizeof(intData));
/* Read the file and populate the config string data. */
for (idx = 0; idx < STR_LIST_LENGTH; idx++) {
cfgData->strDataList[idx].name =
malloc(sizeof(char) * (strlen(listStrDataNames[idx]) + 1));
strcpy(cfgData->strDataList[idx].name, listStrDataNames[idx]);
cfgData->strDataList[idx].value = NULL;
rewind(fileCfg);
do {
fgets(lineBuffer, BUFSIZ, fileCfg);
tmpPtr = strtok(lineBuffer, "=");
if (tmpPtr == NULL)
continue;
if (tmpPtr[0] == '/' && tmpPtr[1] == '/')
continue;
if (strstr(tmpPtr, cfgData->strDataList[idx].name) == NULL)
continue;
do {
tmpPtr = strtok(NULL, "\"");
} while (tmpPtr != NULL && *tmpPtr == ' ');
if (tmpPtr == NULL)
continue;
cfgData->strDataList[idx].value =
malloc(sizeof(char) * (strlen(tmpPtr) + 1));
strcpy(cfgData->strDataList[idx].value, tmpPtr);
break;
} while (feof(fileCfg) == 0);
if (cfgData->strDataList[idx].value == NULL) {
if (idx < NETWORK_USERNAME_POS) {
printf("Error parsing the config file.\nCould not find the \"%s\" "
"variable.\n",
cfgData->strDataList[idx].name);
for (idx2 = 0; idx2 <= idx; idx2++) {
free(cfgData->strDataList[idx2].name);
free(cfgData->strDataList[idx2].value);
}
free(cfgData->strDataList);
fclose(fileCfg);
free(pathCfg);
return 1;
} else {
cfgData->strDataList[idx].value =
realloc(cfgData->strDataList[idx].value, sizeof(char));
strcpy(cfgData->strDataList[idx].value, "");
}
}
}
/* Populate the config integer data names. */
for (idx = 0; idx < INT_LIST_LENGTH; idx++) {
cfgData->intDataList[idx].name =
malloc(sizeof(char) * (strlen(listIntDataNames[idx]) + 1));
strcpy(cfgData->intDataList[idx].name, listIntDataNames[idx]);
cfgData->intDataList[idx].value = -1;
rewind(fileCfg);
do {
fgets(lineBuffer, BUFSIZ, fileCfg);
tmpPtr = strtok(lineBuffer, "=");
if (tmpPtr == NULL)
continue;
if (tmpPtr[0] == '/' && tmpPtr[1] == '/')
continue;
if (strstr(tmpPtr, cfgData->intDataList[idx].name) == NULL)
continue;
do {
tmpPtr = strtok(NULL, "\"");
} while (tmpPtr != NULL && *tmpPtr == ' ');
if (tmpPtr == NULL)
continue;
sscanf(tmpPtr, "%d%ln", &cfgData->intDataList[idx].value, &numCharRead);
if (numCharRead != strlen(tmpPtr)) {
printf("Format error for \"%s\".\n", cfgData->intDataList[idx].name);
for (idx2 = 0; idx2 <= idx; idx2++) {
free(cfgData->intDataList[idx2].name);
}
fclose(fileCfg);
free(pathCfg);
return 1;
}
break;
} while (feof(fileCfg) == 0);
if ((cfgData->intDataList[idx].value == -1) &&
(idx < NETWORK_OPERATOR_POS)) {
printf("Error parsing the config file.\nCould not find the \"%s\" "
"variable.\n",
cfgData->intDataList[idx].name);
for (idx2 = 0; idx2 <= idx; idx2++) {
free(cfgData->intDataList[idx2].name);
}
free(cfgData->strDataList);
free(cfgData->intDataList);
fclose(fileCfg);
free(pathCfg);
return 1;
}
}
free(pathCfg);
fclose(fileCfg);
return 0;
}
int freeCfgData(listCfgData *cfgData) {
int idx;
for (idx = 0; idx < STR_LIST_LENGTH; idx++) {
free(cfgData->strDataList[idx].name);
free(cfgData->strDataList[idx].value);
}
free(cfgData->strDataList);
for (idx = 0; idx < INT_LIST_LENGTH; idx++) {
free(cfgData->intDataList[idx].name);
cfgData->intDataList[idx].value = -1;
}
free(cfgData->intDataList);
return 0;
}
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