Getting excess characters with fread() in C - c

Question

Okay, so I have tried to read a whole file with fread(), and I can do it successfully, but the longer the file, the more the excess characters I get on the output.
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main() {
FILE* fpointer = fopen("test.txt", "r");
char* wholeFile;
long int fileSize;
if (fpointer == NULL) return 0;
fseek(fpointer, 0, SEEK_END);
fileSize = ftell(fpointer);
rewind(fpointer);
printf("fileSize == %ld\n", fileSize);
wholeFile = (char*)malloc(fileSize+1, sizeof(char));
if (wholeFile == NULL) return 1;
fread(wholeFile, sizeof(char), fileSize, fpointer);
fclose(fpointer);
wholeFile[fileSize] = '\0';
printf("This is whole file:\n\n%s", wholeFile);
free(wholeFile);
return 0;
}
If the file looks like this:
This is cool file.
I get this as output:
This is cool file.²²²²
And if the file is like this:
This
is
cool
file.
I get this as the output:
This
is
cool
file.═══²²²²
Any idea where I'm wrong?
EDIT: Edited code according to comments.

Answer 1

You need to allocate one more than the size of the file and set the last position in the buffer to 0.
C expects character arrays to be null terminated.
Use "rb" to open the file in binary mode. This will ensure you get a reliable count of bytes in the file from Windows.
FILE* fpointer = fopen("test.txt", "rb");
wholeFile = (char*)malloc(fileSize + 1);
wholeFile[fileSize] = '\0';