File read using POSIX API's

Question

Consider the following piece of code for reading the contents of the file into a buffer

#include 
#include 
#include 

        

Answer 1

1, you can get the file size with stat(filename, &stat), but define the buffer to page size is just fine

2, first, there is no NULL character after "Hello", it must be accident that the stack area you allocated was 0 before your code executed, please refer to APUE chapter 7.6. In fact you must initialize the local variable before using it.

I tried to generate the text file with vim, emacs and echo -n Hello > file-to-buff.txt, only vim adds a line break automatically