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Activity for alx
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #287748 |
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| Edit | Post #287748 |
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| Edit | Post #287748 |
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| Edit | Post #287748 |
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| Edit | Post #287748 |
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| Edit | Post #287748 |
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| Edit | Post #287748 |
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| Edit | Post #287748 | Initial revision | — | about 2 years ago |
| Question | — |
Strict aliasing rules and function boundaries Let's analyze this code, assuming an architecture where the alignment of `int64t` is the same as that of `double`: ```c void bar(double f, int64t j) { (int64t )f = j; } void foo(void) { int64t i = 1; bar((double ) &i, &i); } ``` - The object is of type `int64t`. - ... (more) |
— | about 2 years ago |
| Edit | Post #287522 |
Post edited: ffix |
— | over 2 years ago |
| Edit | Post #287522 |
Post edited: reorder params |
— | over 2 years ago |
| Edit | Post #285946 |
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| Edit | Post #287522 |
Post edited: revert last change. ***cat() functions have the common meaning of appending after finding a NUL; this one doesn't. |
— | over 2 years ago |
| Edit | Post #287522 |
Post edited: Rename to stpecat() |
— | over 2 years ago |
| Edit | Post #287522 |
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| Edit | Post #287522 |
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| Edit | Post #287522 |
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| Edit | Post #287522 |
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| Edit | Post #287522 |
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| Edit | Post #287522 | Initial revision | — | over 2 years ago |
| Answer | — |
A: stpecpy(): Design a better string copy function that truncates After addressing @Lundin 's suggestions: - Implemented in terms of libc functions for performance. - const correctness - style improvements I have a few more that I realized after trying to replace some existing code: Much code out there has `char end = buf + nitems(buf);` (although that s... (more) |
— | over 2 years ago |
| Edit | Post #287345 |
Post edited: parentheses |
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| Edit | Post #287345 |
Post edited: decay arrays |
— | over 2 years ago |
| Edit | Post #287345 |
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| Edit | Post #287345 | Initial revision | — | over 2 years ago |
| Answer | — |
A: How to write a macro that discards the const qualifier, for any type? I developed this macro (using GNU C) similar to C++'s constcast(). ```c #define constcast(t, p) \ ({ \ staticassert(builtintypescompatiblep(typeof(&(p)), const t)); \ ... (more) |
— | over 2 years ago |
| Comment | Post #286578 |
I was wondering about Unix systems in general, and Linux if there are differences across Unices. (more) |
— | almost 3 years ago |
| Comment | Post #286628 |
...
The static assert would need to be at call site, but that would not make sure the function is not referenced anywhere else in the code. And a static assert at the A_* function definitions would always be triggered, as long as the functions are being compiled.
I only want to trigger it if t... (more) |
— | almost 3 years ago |
| Comment | Post #286628 |
Okay, so the problem (the current code I'm dealing with) is:
A program might be compiled with support for feature A, or without support for it (I guess for having a slimmer/faster binary). The feature is basically some A_*() functions, and some calls to those functions from core functions.
Rig... (more) |
— | almost 3 years ago |
| Edit | Post #286628 |
Post edited: tfix |
— | almost 3 years ago |
| Edit | Post #286628 |
Post edited: renamed landmine() to assert_not_present_in_binary_if(), per Dirk's suggestion. |
— | almost 3 years ago |
| Comment | Post #286628 |
That makes sense to me :) Thanks! (more) |
— | almost 3 years ago |
| Edit | Post #286628 |
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| Edit | Post #286628 |
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| Edit | Post #286628 | Initial revision | — | almost 3 years ago |
| Answer | — |
A: Assert that some code is not present in the final binary, at compile or link time. Calling an undefined function will have that behavior at link time: `landmine.c`: ```c #ifndef CONSTANT #define CONSTANT 0 #endif #define assertnotinbinaryif(e) do \ { \ if (e) \ undefinedfunction(); \ } while (0) void undefinedfunction(void); [[gnu::noipa]] static void foo0(vo... (more) |
— | almost 3 years ago |
| Edit | Post #286627 |
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