C file to check if file is empty or contains ASCII text

Question

I'm trying to write a program which should be able to take a file as input in terminal and then determine if the file is empty or written in ASCII text. But I keep getting segmentation fault 11.

My code is as follows:

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

int main(int argc, char *argv[])
{
    unsigned char c;
    int size;

    FILE *file = fopen(argv[1], "r");

    fseek(&c, 0, SEEK_END);
    size = ftell(file);

    if (size == 0)
    {
        printf("file is empty\n");
    }

    fclose(file);

    FILE *file = fopen(argv[1], "r");
    c = fgetc(file);

    if (c != EOF && c <= 127)
    {
        printf("ASCII\n");
    }

    fclose(file);
}

Any ideas as to why?

Answer 1

1] fseek doesnt have first argument unsgined char*, but FILE*.

fseek(file, 0, SEEK_END);

2] You shouldn't use unsigned char / char for checking for EOF, use int for sure.

3] Working and simplier code

int main(int argc, char *argv[])
{
    if (argc < 2)
    {
        // err we havent filename
        return 1;
    }

    int c;

    FILE *file = fopen(argv[1], "r");
    if (file == NULL)
    {
        // err failed to open file
        return 1;
    }

    c = fgetc(file);

    if (c == EOF)
    {
        printf("empty\n");
        fclose(file);
        return 0;
    }
    else
    {
        ungetc(c, file);
    }

    while ((c = fgetc(file)) != EOF)
    {
        if (c < 0 || c > 127)
        {
            // not ascii
            return 1;
        }
    }

    printf("ascii\n");

    fclose(file);
    return 0;
}