How to check if a char is in a .txt file? - c

Question

In my program I am supposed to make a rush hour game in C. I am importing the board shown from a text file.
After than I ask the user for input, which is supposed to be the char on the board he wants to move.
My question is when the user picks the char, how can I check if the char he picked exists in the board.txt file, because if it doesn't, I need to ask the user to pick a new character.
This is how the input section of the code looks so far:
char Direction[1];
char Vehicle[1];
int intInput =0;
// get the char input for the type of vehicle
printf("Please enter which vehicle you would like to move:\n");
scanf("%s", &Vehicle);
//THIS IS WHERE I NEED TO CHECK IF THE CHAR PICKED EXISTS IN board.txt
printf(" This is the input: %s\n", Vehicle);
//get the char input for the direction you want to move
printf("Please choose if you want to move right(R) or left(L):\n");
scanf("%s", &Direction);
if(Direction != "r"||"l"){
printf("Please choose a valid direction(R=Right L=Left):\n");
scanf("%s", &Direction);
}
else{
printf("Your move was %s\n", Direction);
}
//get the int input
printf("Enter how far you would like to move:");
scanf("%d", &intInput);
if(intInput<0){
printf("Please enter a positive integer:");
scanf("%d", &intInput);
}
else{
printf("The inpuy is %d", intInput);
}

Answer 1

how I check if the char he picked exists in the board.txt
The best method is to read the data per line into a buffer to read use fgets
And find char in that buffer. To find use strchr
following code illustrate what i mean
FILE * fp;
fp= fopen("board.txt", "r");
char buffer[256];
if (!fp)
{
printf("error");
return;
}
while (fgets(buffer, 256, fp))
{
char *ptr = strchr(str, Direction);
if(ptr)
printf("found\n");
else
printf("Not found\n");
}
fclose(fp);