The While If

bulg

Here's one you've probably seen before..

while ( GlobalBufferPos > BytesToRead )
{
if (//enough space)
{
//copy data to GlobalBuffer
}
else
{
Temp = //space left;
// copy data into GlobalBuffer
// copy data into GlobalBuffer2
}
GlobalReadPos += BytesToRead;
if(GlobalReadPos > MAX_SIZE) GlobalReadPos -= MAX_SIZE;

GlobalBufferPos -= BytesToRead;
WriteData(...);
    Temp = BytesToRead
break;

}
// return ... ;

I suppose it made sense at the time.

PIEBALDconsult

Yeah, probably. I would assume that originally they wanted the while and later decided otherwise; I would either have removed the while or made the break conditional.

supercat9

I have on occasion used:

{
...
do {
...
if (condition) break;
...
if (condition) break;
...
} while(0);
...

with the while() "loop" being merely a block from which the code could "break". I wonder if the code here began as something similar, but replacing an "if()" and "do {} while()" with a "while()" and a "break".

PIEBALDconsult

No, that horror is by people who think it's less of a horror than a goto.

supercat9

PIEBALDconsult wrote:

No, that horror is by people who think it's less of a horror than a goto.

Many modern languages support exceptions on the basis that conventional structured programming constructs can't practically handle everything that programs need to do. In languages which support exceptions, they should be used when appropriate. What would you suggest doing, if not a 'goto' or 'break', in situations where an exception would be appropriate but the language doesn't support them? BTW, I wish some standards agency would draft an extension of the C99 standard which would allow something like exceptions but only within a particular function (C++, which allows full-fledged extensions, already exists, but run-time support for exceptions requires too much overhead to be practical on some smaller microcontrollers; limited support for exceptions within a function could improve program structure without impacting code size, speed, or RAM requirements.

PIEBALDconsult

Huh? I use goto when necessary (which is very rare).

Nagy Vilmos

goto bathroom. goto kitchen. goto pub. They seem necessary :-D

Panic, Chaos, Destruction. My work here is done.

PIEBALDconsult

Only the bathroom is a necessary.

bolivar123

Just an optional requirement..... :laugh: