#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

void _write_file(char const* filename, char const* text) {
    FILE* file = fopen(filename, "w");
    fputs(text, file);
    fclose(file);
}

void print_file_contents(FILE* file) {
    printf("File position is %ld\n", ftell(file));
    for (char ch = fgetc(file);
            !feof(file); ch = fgetc(file)) {
        printf("Found character '%c', ascii value %d\n",
                ch, ch);
        printf("File position is %ld\n", ftell(file));
    }
}

int main(int argc, char* argv[]) {
    _write_file("long_file.txt", "abcdefghi\xff ABCDEF");
    FILE* file = fopen("long_file.txt", "r");

    printf("Seek cur to 10\n");
    fseek(file, 10, SEEK_CUR);
    print_file_contents(file);
    // current position is end of file  
    printf("Seek set to 0\n");
    fseek(file, 0, SEEK_SET);
    print_file_contents(file);
    // current position is end of file  
    printf("Seek end to -10\n");
    fseek(file, -10, SEEK_END);
    print_file_contents(file);

    fclose(file);
    return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */