Messages in this thread | | | From | "Kars Mulder" <> | Date | Wed, 24 Jun 2020 17:25:45 +0200 | Subject | Re: Writing to a const pointer: is this supposed to happen? |
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On Wednesday, June 24, 2020 15:10 CEST, Greg Kroah-Hartman wrote: > Have you hit any runtime issues with this code doing this? These > strings should be held in writable memory, right? Or do you see a > codepath where that is not the case?
I haven't ran into any issues with it; I was just looking at the code as reference for a patch I'm working on.
I initially assumed that casting a const pointer to non-const and writing to it would be undefined behaviour, but after reading through the C99 standard I can't find an unambiguous statement whether it is undefined behaviour even if the const pointer points to an object that was originally non-const (like char* -> const char* -> char* casts); it only says it is undefined behaviour if the object was defined with the const qualifier.
I should probably stop bothering you with my newbie questions.
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