Re: 80286 protected mode

On 10/10/2024 02:33, MitchAlsup1 wrote:

On Wed, 9 Oct 2024 21:52:39 +0000, Stephen Fuld wrote:
 

On 10/9/2024 1:20 PM, David Brown wrote:

>
There are lots of parts of the standard C library that cannot be written
completely in portable standard C.  (How would you write a function that
handles files?

 Do you mean things other than open(), close(), read(), write(), lseek()
??
 

The C standard library provides functions like fopen(), fclose(), fwrite(), etc.  It provides them because programs often need such functionality, and you cannot write them yourself in portable standard C.  (As Stephen pointed out, C could have had them built into the language - for many good reasons, C did not go that route.)
The functions you list here are the POSIX names - not the C standard library names.  Those POSIX functions cannot be implemented in portable standard C either if you exclude making wrappers around the standard library functions.
In both cases - implementing the standard library functions or implementing the POSIX functions - you need something beyond standard C, such as a way to call OS API's.

You need non-portable OS calls.)  That's why these
things are in the standard library in the first place.