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

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

int main(int argc, char* argv[]) {
    _write_file("abc.txt", "ABC\n\xff");

    FILE* file = fopen("abc.txt", "r");
    char ch = fgetc(file);
    printf("Found ascii %d '%c'\n", ch, ch);
    ch = fgetc(file);
    printf("Found ascii %d '%c'\n", ch, ch);
    ch = fgetc(file);
    printf("Found ascii %d '%c'\n", ch, ch);
    ch = fgetc(file);
    printf("Found ascii %d '%c'\n", ch, ch);
    // if you run out of data in a file,
    // fgetc returns EOF
    // note that if you are using char, we cannot
    // distinguish EOF from ascii 255
    int eof = fgetc(file);
    if (eof != EOF) {
        printf("Found ascii %d '%c'\n", eof, eof);
    }

    fclose(file);

    return EXIT_SUCCESS;
}
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