Why does `size` = `0` occur?

Question

I've been trying PSet4's Recover. I've been trying to obtain the size of the entered file (card.raw) but unfortunately size gives and output of 0.

Here's the code that I've made to find the file's size:

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

int main(int argc, char *argv[])
{
    int counter = 0;
    if(argc != 2)
    {
        printf("Usage: ./recover image\n");
        return 1;
    }
    FILE *recover = fopen(argv[1], "r");
    if(recover == NULL)
    {
        printf("ERRNO 1 IS %s\n", strerror(errno));
        exit(EXIT_FAILURE);
    }
    fseek(recover, 0L, SEEK_END);
    unsigned long size = ftell(recover);
    fseek(recover, 0L, SEEK_SET);
    printf("Size is : %lu", size);
} 

One thing that seems to be happening is that changing argv[1] to argv[0] actually gives me a non zero file size. Any reason why this happens?

Answer 1

The code is working correctly. If it's giving a file size of 0, the file size really is zero. Maybe it was overwritten? If the file weren't there, it would gen an error.

Why are you getting a file size when changing to argv[0]? Simple. The code is using the name of the executable file recover.

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