Bestimmung der Dateigröße mit fseek und ftell

#include <stdio.h>
 
long get_file_size(const char *path) {
    FILE *file = fopen(path, "rb");
    if (!file) return -1;
 
    fseek(file, 0L, SEEK_END); // Move pointer to end
    long size = ftell(file);   // Get current offset
    fclose(file);
    
    return size;
}
 
int main(void) {
    long bytes = get_file_size("example.bin");
    if (bytes != -1) printf("File size: %ld bytes\n", bytes);
    return 0;
}