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#include <gpiod.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "utils.h"
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(struct structCfg *dataCfg, const char *pathExe) {
char strBuffer[BUFSIZ];
char *pathCfg, *pathDirEnd, *tmpPtr = NULL;
const char *filenameCfg = "network_monitor.cfg";
int sizePathDir;
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(filenameCfg) + 2));
strncpy(pathCfg, pathExe, sizePathDir + 1);
strcat(pathCfg, filenameCfg);
/* Open the config file. */
fileCfg = fopen(pathCfg, "r");
if (fileCfg == NULL) {
printf("Cannot open config file \"%s\".\n", pathCfg);
goto readCfgFail1;
}
/* Check that it is not empty. */
if (fgets(strBuffer, BUFSIZ, fileCfg) == NULL) {
printf("Config file is empty.\n");
goto readCfgFail2;
}
/* Read the file and look for the "path_to_serial_port". */
rewind(fileCfg);
do {
fgets(strBuffer, BUFSIZ, fileCfg);
tmpPtr = strtok(strBuffer, " =\n\t\r\"");
if (tmpPtr == NULL)
continue;
if (strcmp("path_to_serial_port", tmpPtr) != 0)
continue;
tmpPtr = strtok(NULL, " =\n\t\r\"");
if (tmpPtr == NULL)
continue;
dataCfg->pathSerialPort =
realloc(dataCfg->pathSerialPort, sizeof(char) * (strlen(tmpPtr) + 1));
strcpy(dataCfg->pathSerialPort, tmpPtr);
break;
} while (feof(fileCfg) == 0);
if (dataCfg->pathSerialPort == NULL) {
printf("Could not find the \"path_to_serial_port\" variable.\n");
goto readCfgFail2;
}
/* Read the file and look for the "path_to_gpio_chip". */
rewind(fileCfg);
do {
fgets(strBuffer, BUFSIZ, fileCfg);
tmpPtr = strtok(strBuffer, " =\n\t\r\"");
if (tmpPtr == NULL)
continue;
if (strcmp("path_to_gpio_chip", tmpPtr) != 0)
continue;
tmpPtr = strtok(NULL, " =\n\t\r\"");
if (tmpPtr == NULL)
continue;
dataCfg->pathGpioChip =
realloc(dataCfg->pathGpioChip, sizeof(char) * (strlen(tmpPtr) + 1));
strcpy(dataCfg->pathGpioChip, tmpPtr);
break;
} while (feof(fileCfg) == 0);
if (dataCfg->pathGpioChip == NULL) {
printf("Could not find the \"path_to_gpio_chip\" variable.\n");
goto readCfgFail3;
}
/* Read the file and look for the "pin_pwr_key". */
rewind(fileCfg);
do {
fgets(strBuffer, BUFSIZ, fileCfg);
tmpPtr = strtok(strBuffer, " =\n\t\r\"");
if (tmpPtr == NULL)
continue;
if (strcmp("pin_pwr_key", tmpPtr) != 0)
continue;
tmpPtr = strtok(NULL, " =\n\t\r\"");
if (tmpPtr == NULL)
continue;
sscanf(tmpPtr, "%d%ln", &dataCfg->pinPwrKey, &numCharRead);
if ((numCharRead != strlen(tmpPtr)) || (strtok(NULL, " =\n\t\r\"") != NULL)) {
printf("Format error for \"pin_pwr_key\".\n");
goto readCfgFail4;
}
break;
} while (feof(fileCfg) == 0);
if (dataCfg->pinPwrKey == -1) {
printf("Error parsing the config file.\nCould not find the "
"\"pin_pwr_key\" variable.\n");
goto readCfgFail4;
}
/* Read the file and look for the "pin_status". */
rewind(fileCfg);
do {
fgets(strBuffer, BUFSIZ, fileCfg);
tmpPtr = strtok(strBuffer, " =\n\t\r\"");
if (tmpPtr == NULL)
continue;
if (strcmp("pin_status", tmpPtr) != 0)
continue;
tmpPtr = strtok(NULL, " =\n\t\r\"");
if (tmpPtr == NULL)
continue;
sscanf(tmpPtr, "%d%ln", &dataCfg->pinStatus, &numCharRead);
if ((numCharRead != strlen(tmpPtr)) || (strtok(NULL, " =\n\t\r\"") != NULL)) {
printf("Format error for \"pin_status\".\n");
goto readCfgFail4;
}
break;
} while (feof(fileCfg) == 0);
if (dataCfg->pinStatus == -1) {
printf("Error parsing the config file.\nCould not find the "
"\"pin_status\" variable.\n");
goto readCfgFail4;
}
free(pathCfg);
fclose(fileCfg);
return 0;
readCfgFail4:
free(dataCfg->pathGpioChip);
readCfgFail3:
free(dataCfg->pathSerialPort);
readCfgFail2:
fclose(fileCfg);
readCfgFail1:
free(pathCfg);
return 1;
}
/* Do not call this before initializing dataCfg with readCfg(). */
int freeCfgData(struct structCfg *dataCfg) {
dataCfg->pinPwrKey = -1;
dataCfg->pinStatus = -1;
free(dataCfg->pathGpioChip);
free(dataCfg->pathSerialPort);
return 0;
}
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