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

// ftell(…) returns the position in the file where we will read or write next.

// OK to copy/adapt this function if you understand it completely.
char const* write_file(char const* contents, char const* filename) {
    FILE* fp = fopen(filename, "w");
    fputs(contents, fp);
    fclose(fp);
    return filename;
}

int main(int argc, char* argv[]) {
    char const* filename = "DOES_NOT_EXIST.txt";
    
    logf_yellow("Open the file.\n");
    FILE* fp = fopen(filename, "r");
    // fopen(…) returns null if the file does not exist.

    if(fp != NULL) {
        // Jump to end of file.
        fseek(fp, 0, SEEK_END);  // 0 bytes from the end of the file
        // Specifically: Set the file position indicator to the end of the file.

        // Get current position (at end of file).  That will be the length of the file
        int position = ftell(fp);

        printf("File \"%s\" contains %d characters.\n", filename, position);

        fclose(fp);
    }

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