Now i have this function, scriviDatabase, that takes in a tm struct and an int, reads the first char of the file and then creates a string that it writes into a file named database.txt: but whenever i run this code i get no output at all in the file database.txt, it exists and it is located in the program folder but still no output.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

void scriviDatabase(struct tm giorno,int temp) {
    int pos;
    char bufr;
    char buf[256];
    FILE *lgPos  = fopen("database.txt", "r ");
    if (lgPos == NULL) 
        {   
            printf("Errore! Non ho potuto trovare il database!\n"); 
            exit(-1);
        }
    fread(&bufr, 1,sizeof(bufr), lgPos);
    if (bufr == 10) {
        bufr = '0';
    }
    sprintf(buf,"%c Giorno: %s %d/%d/%d Temp: