Question

I have little doubt about string reading in C.

string reading functions like gets, scanf, read, fscanf , fgets…

which C function can do a secure or safe string reading from any file?

Or

Which C function can be reliable to read a string in a file ?

Answer 1

An input function will be secure/safe(not allow buffer overflow) if it takes the length of the buffer as an arguments so that the function does not read more char than the buffer can hold.

Of the function you’ve listed fgets() and read() take the buffer length as argument and can be considered safe.