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#include<stdio.h>
#include<stdlib.h>
#include<errno.h>
#include<fcntl.h>
#include<string.h>
#include<unistd.h>
#define BUFFER_LENGTH 256
///< The buffer length (crude but fine) static char receive[BUFFER_LENGTH];
///< The receive buffer from the LKM
int main(){
	int ret, fd;
    char stringToSend[BUFFER_LENGTH];
    printf("Starting device test code example...\n");
    fd = open("../../../dev/dev1", O_RDWR);             // Open the device with read/write access
    if (fd < 0){
       perror("Failed to open the device...");
       return errno;
    }
    printf("Type in a short string to send to the kernel module:\n");
    scanf("%[^\n]%*c", stringToSend);                // Read in a string (with spaces)
    printf("Writing message to the device [%s].\n", stringToSend);
    ret = write(fd, stringToSend, strlen(stringToSend)); // Send the string to the LKM
    if (ret < 0){
       perror("Failed to write the message to the device.");
       return errno;
    }
    printf("Press ENTER to read back from the device...\n");
    getchar();
    printf("Reading from the device...\n");
    ret = read(fd, receive, BUFFER_LENGTH);        // Read the response from the LKM
    if (ret < 0){
       perror("Failed to read the message from the device.");
       return errno;
    }
    printf("The received message is: [%s]\n", receive);
    printf("End of the program\n");
    return 0;
}