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I have done something like this just a few times and I remember them fairly clearly. One was because of performance reasons and the other was because C does not have templates. This does not appear to be either case. In fact, it's a single-pass pseudo-loop. I have done that too but never in a macro and never when there wasn't at least a few breaks in the "loop." I see no good reasons at all for this monstrosity.
"They have a consciousness, they have a life, they have a soul! Damn you! Let the rabbits wear glasses! Save our brothers! Can I get an amen?"
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Rick York wrote: I have done something like this just a few times and I remember them fairly clearly.
Don't worry, Rick. We won't tell anyone. 
Rick York wrote: I see no good reasons at all for this monstrosity.
Same. Peter (above) mentioned a good point, the code was written in C89 before the inline keyword. So, can only guess it was for performance. Personally, I think I would've taken the performance hit of a function call. Assuming it was written in the 90s due to C89... a function call wasn't that bad IMO.
Jeremy Falcon
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That's why function templates were created in C++. All of the compile time features without adding overhead or degradation in execution speed. When I am coding in C++, I rarely use/utilize macros.
Which isn't to say that macros, properly implemented aren't useful. Take, example, the need to "stringize" a set of characters. You can't really beat:
#define STRINGIZE(x) #x
One more thing... too often, macros are used to provide some way to represent a value, as opposed to using a const variable declaration.
One should eschew this:
#define PI 3.1415927f
in favor of this:
const float PI = 3.1415927f;
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1,000% agree. To be honest, my C++ is weak. I've always done "C in C++" but maybe it's time I revisit that.
Jeremy Falcon
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I got a stack overflow in my SVG code. It never used to do that before, and I barely changed anything. I just removed a few divisions in some relatively innocuous routines. Furthermore, reverting the changes didn't fix it.
There's something else going on. Well, on little embedded devices there's not a whole lot of memory protection. When you stack overflow it clobbers the stack so you can't get even a partial stack trace.
Okay. My code is cross platform. I'll fire it up on my PC under MSVC++
Compile errors. Turns out what I thought was a harmless feature add makes MSVC++'s compiler just scream. 100 errors for less than 10 lines of code. I removed the feature. It's a shame too, as it was a real convenience.
Got it building.
Put together my test code - basically just de-arduino-ing it and then making it spit the graphics as ascii art to the console. No big deal.
Run it. No crash. No stack overflow.
Which tells me the problem is the one I didn't want to try and solve. Now I need to figure out what's taking all the stack, rather than what is recursing indefinitely.
I did move 2KB off the stack but it's still dying on me.
This code is non-trivial. It's the SVG parsing code, and took me forever to create it. I tried to keep it light on the stack but apparently it's not light enough.
Pruning for stack space in a veritable labyrinth of function calls is not my idea of fun.
I have a dentist appointment later today which seems appealing by comparison. 
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
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honey the codewitch wrote: . It never used to do that before, and I barely changed anything. I just removed a few divisions in some relatively innocuous routines.
lol.
Famous last words...
CI/CD = Continuous Impediment/Continuous Despair
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Like I said, I reverted the changes and the problem still occurs.
I know better than not to verify that.
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
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I sympathise. Many years ago I worked on a desktop financial calculator which had 32K of EPROM for all the code and 16K of battery backed RAM for everything else, all the persistent storage and workspace, display buffer, the lot, and the number of times we had late nights reworking the code to save a few bytes here and there so it would fit in the EPROM, or shaving the stack usage so our variables survived ... a very character building time.
modified 21-Aug-24 5:52am.
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Rust.
(I'm sorry I felt this had to be done)
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I do not know anything about rust, but does rust have infinite stack ?
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Please explain why RUST would have solved this problem. Honest and curious question.
stack issues are common in embedded systems, no matter what development language you choose.
Charlie Gilley
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
Has never been more appropriate.
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Saw this absolutely stupid wording on my start screen today: "Matriculate your shopping over to [our browser] to help ensure low prices..."
Evidently MS, in their infinite stupidity, has re-enabled ads on the start screen even though I turned them off earlier. Looking into this more: Yes, yes they did. (Evidently on one of their 'minor point' updates.)
And the person who thinks 'matriculate' is a catchy word to entice people with should be fired, and not hired for anything more than cleaning toilets. 
Maybe this would keep them away from a keyboard: Chinese finger torture[^]
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There's always a possibility that there's a LLM behind this. It appears to be a common thing now, to write marketing copy from a prompt.
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If so, the person behind that decision should be fired, and not hired for anything more than cleaning toilets.
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I'm not even sure I'd hire someone that lazy to clean toilets. I'd be afraid they wouldn't use any cleaners.
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Make them lick it clean, then.
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I see a lot of clean bathrooms at MS just saying
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Maybe they just couldn't spell Ma*****ate.
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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Don't see why - Shift '8' is a relatively easy keystroke!
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That's a '(' on a Norwegian keyboard.
Religious freedom is the freedom to say that two plus two make five.
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Ads in the OS should be made illegal, I hope the EU will ![Elephant | [mastadon]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/elephant.gif) MS over with an oil drill on this.
GCS/GE d--(d) s-/+ a C+++ U+++ P-- L+@ E-- W+++ N+ o+ K- w+++ O? M-- V? PS+ PE Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
The shortest horror story: On Error Resume Next
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"we estimate we can sell up to 80% of an individual's visual field before inducing seizures"
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I had to look up that word and undoubtedly many non-English-as-first-language speakers with me (and probably some native English speakers as well) 
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Well, obviously the person who wrote the ad doesn't. 
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I consider my vocabulary to be pretty good. That usage didn't match my expectation, so I looked it up. Their usage is quite a stretch. The word is used so infrequently that most people won't be familiar with it, and will just be confused.
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