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The Underhanded C Contest
The official perfectly innocent web page for law-abiding good guys 2.3.16 Results of the 2015 Underhanded C Contest Posted at 9:55 am by XcottCraver We have judged all submissions, and are pleased to announce the runners up and winner of the 2015 Underhanded C Contest. This year we had over 40 submissions, and they were all of high quality. As a result, our list of runners up is pretty long. I wil
Overloading Macro on Number of Arguments
I have two macros FOO2 and FOO3: #define FOO2(x,y) ... #define FOO3(x,y,z) ... I want to define a new macro FOO as follows: #define FOO(x,y) FOO2(x,y) #define FOO(x,y,z) FOO3(x,y,z) But this doesn't work because macros do not overload on number of arguments. Without modifying FOO2 and FOO3, is there some way to define a macro FOO (using __VA_ARGS__ or otherwise) to get the same effect of dispatchi
GCC Explorer - an interactive take on compilation — Matt Godbolt’s blog
One of the things I spend a fair amount of time doing at work is compiling my C/C++ code and looking at the disassembly output. Call me old-fashioned, but I think sometimes the only way to really grok your code is to see what the processor will actually execute. Particularly with some of the newer features of C++11 — lambdas, move constructors, threading primitives etc — it’s nice to be able to se
Deep C
Programming is hard. Programming correct C and C++ is particularly hard. Indeed, both in C and certainly in C++, it is uncommon to see a screenful containing only well defined and conforming code.Why do professional programmers write code like this? Because most programmers do not have a deep understanding of the language they are using.While they sometimes know that certain things are undefined o
Big Sky :: Re: サブドメインに任意の文字列が入るウェブアプリのローカル開発
サブドメインに任意の文字列が入るウェブアプリのローカル開発 - 冬通りに消え行く制服ガールは?夢物語にリアルを求めない。 - subtech サブドメインに任意の文字列が入るようなサービスをローカルで開発しようとすると、いろんなホストを /etc/hosts に書かないといけなくてすごく不便なので、なんとかしようと思っていたところ、id:hakobe932 先生に「それアレでできますよ」との御言葉を頂き、簡単なスクリプトを書きました。 http://subtech.g.hatena.ne.jp/cho45/20110804/1312389877 僕ならこうやるかも libcho45.c #define _GNU_SOURCE #include <dlfcn.h> #include <stdio.h> #include <string.h> #include <stdlib.h> #incl
あらゆるCプログラマが未定義の動作について知るべきこと - YAMDAS現更新履歴
LLVM Project Blog: What Every C Programmer Should Know About Undefined Behavior #1/3 LLVM Project Blog: What Every C Programmer Should Know About Undefined Behavior #2/3 LLVM Project Blog: What Every C Programmer Should Know About Undefined Behavior #3/3 コンパイラ基盤 LLVM のブログで、未定義の動作という C 言語のダークサイドについての記事が3回シリーズで公開されている。 C 言語で未定義の動作を実行したら、「鼻から悪魔が飛び出しても文句が言えない」というジョークは有名で……いや、そんなのを知ってるのは年寄りくらいか（参考：nasa
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KariyaSiesta | C 言語向けのコーディングチェッカ