Why is sscanf() not reading line from CSV file into array?

Question

I am trying to read the ints from a CSV file into a 2D-Array.

Here is my code...

FILE* fp = fopen(argv[1], "r");
int counter = 0;
char line[50];
while (fgets(line, 50, fp)) {
    counter++;
}
int arry[counter - 1][4];
NUM_ROWS = counter -1;
counter = 0;

//Iterate File Again to Populate 2D Array of PID, Arrival Time, Burst Time, Priority
//File in Format: #,#,#,# 
rewind(fp);
//Skip First Line of Var Names
fgets(line, 50, fp);
while(fgets(line, 50, fp)) {
    sscanf(line, "%d%d%d%d", &arry[counter][0], &arry[counter][1], &arry[counter][2], &arry[counter][3]);
    counter++;
}

However, sscanf() is not reading the line into the array. I am unsure why this is not working

Edit: Here is a picture of the file.

Answer 1

1. You need to have the scanf format string which reflects the format of the scanned line.
2. Always check the result of scanf

Example:

int main(void)
{
    char line[] = "34543,78765,34566,35456";
    int arry[1][4];
    int counter = 0;

    int result = sscanf(line, "%d,%d,%d,%d", &arry[counter][0], &arry[counter][1], &arry[counter][2], &arry[counter][3]);
    
    printf("result = %d\n", result);
    printf("CSV line = `%s`\n", line);
    printf("data read: %d, %d, %d, %d\n", arry[counter][0], arry[counter][1], arry[counter][2], arry[counter][3]);
}  

https://godbolt.org/z/zs5Y8ff8h