How size of buffer get full

Question

0.00/5 (No votes)

See more:

I am reading about stream and buffer in C Language.
I got that if stream is line buffered then the accumulated characters of buffer get transferred in the from of block whenever the newline character encounter.
and if stream is unbuffered then character are intended to appear from the source or appear at the destination as soon as possible without getting store in buffer.

but if stream is fully buffered then the accumulated characters of buffer get transfered in the form of block whenever the buffer get totally filled.
Now I am unable to understand that in which condition the buffer get totally filled.From where the buffer decides it's size?

What I have tried:

I have learnt about line buffered and got it clearly but there is problem with fully buffered.

Posted 15-Jun-21 18:52pm

surajgirioffl

Updated 15-Jun-21 19:05pm

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2021-06-15T19:05:00

From the source:

Online C11 standard, 7.21.3/3[^]:
When a stream is fully buffered, characters are intended to be transmitted to or from the host environment as a block when a buffer is filled.

Basically, with a fully buffered stream the source sends nothing until it's output buffer is completely full, or it reaches the end of data it wants to send.
So the destination gets no data until a buffer full is available (or the end of the source is reached).

Think of it as a shop selling loose peanuts: the assistant pours 500g into a bag and hands it over to the customer. Then they pour another 500g into another bag, and pass that over as well. Then finally, he pours 250g into a third bag, and the customer has his 1.25Kg of nuts, and can pay and go.
The bag can't take more than 500g, so that's what gets "delivered" at any one time.