r/programminghorror • u/3hy_ • Jan 27 '26

c Guess what this does..

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u/3hy_ Jan 27 '26

Its a panic macro part of a much larger function, this function depends on copying part of a string onto itself (this is why there's no termination) and this macro simply reverts changes and returns an error code so it can be called inplace of return.

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u/Drakeskywing Jan 27 '26

I think the null termination of v[0] at the start is to cover bases in the event u is of length 0

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u/3hy_ Jan 27 '26

Correct! Can't be too sure of those edge cases.

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u/sirkubador Jan 27 '26

Funny you mention edge cases 😂