Scope and Visibility
An identifier's "visibility" determines the portions of the program in which it can be referenced — its "scope." An identifier is visible (i.e., can be used) only in portions of a program encompassed by its "scope," which may be limited (in order of increasing restrictiveness) to the file, function, block, or function prototype in which it appears. The scope of an identifier is the part of the pro
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2014å¹´08月21æ—¥ C/C++プリプãƒã‚»ãƒƒã‚µã®æŒ™å‹•ã®é•ã„（defined編） å‰å›žã®è¨˜äº‹ã§ãƒ“ルドã—㟠Facebook 社㮠Warp ã®æŒ™å‹•ã‚’調ã¹ã¦ã„ãŸæ‰€ã€#if ã‚„ #elif 指令ä¸ã§ã®ã¿ä½¿ç”¨å¯èƒ½ãª defined å˜é …演算åã®æŒ™å‹•ãŒ GCC ã®ãƒ—リプãƒã‚»ãƒƒã‚µã¨ç•°ãªã‚Šã€GCC 用ã®ãƒ˜ãƒƒãƒ€ã‚’å‰å‡¦ç†ã§ããªã„事例を発見ã—ãŸã®ã§ã€ãã®æ™‚ã®ãƒ¡ãƒ¢ã§ã™ã€‚ 以下ã®ã‚ˆã†ãªã€ç¾è±¡ãŒå†ç¾ã™ã‚‹æœ€å°ã‚³ãƒ¼ãƒ‰ç‰‡ã‚’用æ„ã—ã¾ã—ãŸã€‚ $ cat defined_test.c #define FOO defined (BAR) #define BAR #if FOO #endif ã“れ㯠warp.exe ã§ã¯ã‚¨ãƒ©ãƒ¼ã«ãªã‚Šã¾ã™ã€‚FOO ã®æœ€åˆã®ãƒžã‚¯ãƒå±•é–‹ã®æ™‚ã« defined 演算åã®å¼•æ•°ã® BAR も一緒㫠#if defined() ã®ã‚ˆã†ã«å±•é–‹ï¼ˆå‰Šé™¤ï¼‰ã•ã‚Œã€ã‚¨ãƒ©ãƒ¼ã«ãªã£ã¦ã„るよã†ã«æ€ã‚ã‚Œã¾ã™ã€‚ $ ./warp
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3. core dumpã¨ã¯ UNIX/Linuxç³»OSã®æ©Ÿèƒ½ プãƒã‚»ã‚¹å®Ÿè¡Œæ™‚ã®ã‚¨ãƒ©ãƒ¼ã«ã‚ˆã‚Šã€ãƒ—ãƒã‚»ã‚¹ã®å‹•ä½œç¶™ç¶š ãŒä¸å¯èƒ½ã ã¨OSãŒåˆ¤æ–ã—ãŸæ™‚ã€ãƒ—ãƒã‚»ã‚¹å¼·åˆ¶çµ‚了㨠åŒæ™‚ã«ãƒ¡ãƒ¢ãƒªå†…容ãªã©ã‚’ディスクã«æ›¸ã込む 書ãè¾¼ã¿å…ˆã®ãƒ•ã‚¡ã‚¤ãƒ«ã‚’通称coreã¨å‘¼ã¶ coreã¯ãƒ—ãƒã‚»ã‚¹ã®æ»ä½“。æ»ã¬ç›´å‰ã®æƒ…å ±ï¼ˆãƒ¡ãƒ¢ãƒªå†… 容ãªã©ï¼‰ãŒè©°ã¾ã£ã¦ã‚‹â†’ãƒã‚°è§£æžã«å½¹ç«‹ã¤ アクセスä¿è·é•å・å˜åœ¨ã—ãªã„命令・ãã®ä»–ä¸æ•´åˆ segmentation fault/bus error
JPCERT C Secure Coding Standard 日本語版 - プリプãƒã‚»ãƒƒã‚µ (PRE) (#c01)
CERT C コーディングスタンダード 日本語翻訳版コーディングスタンダードã®ã”利用æ¡ä»¶ï¼è‘—作権・å…è²¬äº‹é … 00. ã¯ã˜ã‚ã« 01. プリプãƒã‚»ãƒƒã‚µ (PRE) 02. 宣言ã¨åˆæœŸåŒ– (DCL) 03. å¼ (EXP) 04. æ•´æ•° (INT) 05. 浮動å°æ•°ç‚¹ (FLP) 06. é…列 (ARR) 07. æ–‡å—ã¨æ–‡å—列 (STR) 08. ãƒ¡ãƒ¢ãƒªç®¡ç† (MEM) 09. 入出力 (FIO) 10. 環境 (ENV) 11. シグナル (SIG) 12. ã‚¨ãƒ©ãƒ¼å‡¦ç† (ERR) 13. Application Programming Interface (API) 14. 並行性 (CON) 49. 雑則 (MSC) 50. POSIX (POS) AA. å‚è€ƒæƒ…å ± BB. Definitions CC. 未定義ã®å‹•ä½œ DD. 未è¦å®šã®å‹•ä½œ XX. ãŠå•ã„åˆã‚ã› 00ã¯ã˜ã‚ã« ã“ã®ãƒšãƒ¼ã‚¸
Catching Integer Overflows in C
Update 20150422: clang and gcc 5 have builtins now for this, look for __builtin_add_overflow and __builtin_mul_overflow in the documentation. That makes these macros obsolete. Note: This document and the macros make two important assumptions: There are 8 bits in a char. This is not guaranteed by the C standard, and is in fact not true on all platforms, most notably some ancient mainframes. You cou
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OMakeã™ã”ã„。OMakeã¯ãƒžã‚¸ã§ã™ã”ã„。 OMakeã¯GNU makeã®ä»£æ›¿å“ã¿ãŸã„ãªã‚‚ã®ãªã‚“ã ã‘ã©ã€æ£ç›´ãªã¨ã“ã‚ã“ã®ãƒ„ールã®å¼·åŠ›ã•ã¯GNU makeã¨æ¯”ã¹ã‚‹ã¨å¤±ç¤¼ãªãらã„ã™ã”ã„。ã“ã‚Œã®ãŠã‹ã’ã§ã€ã€Œã‚³ãƒ¼ãƒ‰ä¿®æ£â†’ビルド→デãƒãƒƒã‚°â†’コード修æ£â†’・・・ã€ã®ãƒ«ãƒ¼ãƒ—ã®ã€ãƒ“ルドã«ã‚ãŸã‚‹ä½œæ¥ãŒã»ã¼æ¶ˆãˆåŽ»ã£ãŸã€‚ ファイルã®ä¾å˜é–¢ä¿‚ã®è§£æžãŒã¨ã«ã‹ãã™ã”ã„。よãã‚るユースケースãªã‚“ã‹ã®å ´åˆã€æœ€å°é™ã®æ‰‹é–“ã§ã»ã¼å®Œç’§ã«ä¾å˜é–¢ä¿‚を網羅ã—ã¦ã€ã‚ˆã—ãªã«ãƒ“ルドã—ã¦ãれる。 ã¨ã‚Šã‚ãˆãšã€ã¯ã‚„ã¿ãšãŒå®Ÿéš›ã«ä½¿ã£ã¦ã¿ãŸã‚±ãƒ¼ã‚¹ã‚’例ã«ã¨ã£ã¦ãã®ã™ã”ã•ã®ä¸€ç«¯ã‚’紹介ã—よã†ã¨æ€ã†ã€‚ case study è«–ã‚ˆã‚Šè¨¼æ‹ ã¨ã„ã†ã“ã¨ã§ã€è‡ªåˆ†ãŒ OMake を試ã—ã«ã¤ã‹ã£ã¦ã¿ãŸã‚±ãƒ¼ã‚¹ã‚’紹介ã™ã‚‹ã€‚C言語ã§ã‚¹ã‚¿ãƒ†ã‚£ãƒƒã‚¯ãƒ©ã‚¤ãƒ–ラリを作ã£ã¦ã„ã¦ã€ãã‚Œã«åŠ ãˆã¦ç°¡å˜ãªãƒ†ã‚¹ãƒˆãƒ—ãƒã‚°ãƒ©ãƒ を書ã„ã¦ã„る。 /include/ 以下ã«ãƒ˜ãƒƒãƒ€ãƒ•ã‚¡ã‚¤ãƒ«ãŒå…¨éƒ¨ã‚ã‚‹ /sr
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Terence Parr Even experienced C programmers have difficulty reading declarations that go beyond simple arrays and pointers. For example, is the following an array of pointers or a pointer to an array? Naturally, it's a pointer to an array of pointers to functions returning integers. This short article tells you how to read any C declaration correctly using a very simple technique. I am 99% certai
An Interview With Linus Torvalds: Linux and Git - Part 1 30 Years Of Linux
Jeremy founded Tag1 Consulting in 2007. He has been a contributing core Drupal developer since 2002, and helped establish Drupal as a successful CMS through the early popularity of his personal blog, KernelTrap.org. Over the years, he authored and maintained the core statistics module and throttle module, as well as the pager logic and the initial Drupal 5 installer. He continues to contribute to
ユメã®ãƒã‚«ãƒ©: The C Programming Language
プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°è¨€èªžCã®æ•™ç§‘書ã®å®šç•ªã¨è¨€ãˆã°ã€ã‚«ãƒ¼ãƒ‹ãƒãƒ³ã¨ãƒªãƒƒãƒãƒ¼ã«ã‚ˆã‚‹ã‚‚ã®ãŒæœ‰åã 。K&Rã¨å‘¼ã°ã‚Œã¦ã„ã¦ã€ä»Šã ã«ãれを推薦ã™ã‚‹äººã‚‚ã‚ã¨ã‚’ãŸãŸãªã„。 ã‚ãŸã—ã®æœ¬æ£šã«ã‚‚2nd editionãŒã‚る。黄ã°ã‚“ã 表紙ã®å¥¥ä»˜ã‚’見るã¨95/8/12ã¨ãƒ¡ãƒ¢ã—ã¦ã‚る。渡米ã—ã¦ã™ãリファレンスã¨ã—ã¦è³¼å…¥ã—ãŸã‚‚ã®ã 。 プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°è¨€èªžã®å…¥é–€æ›¸ã§æœ€åˆã®ä¾‹ãŒãªã«ãŒãªã‚“ã§ã‚‚hello, worldã¨ã„ã†ã‚‚ã®ã€K&Rã‹ã‚‰ã®æ‚ªã—ã慣習ã§ã‚る。 プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®åˆå¿ƒè€…ãŒã€ãƒ—ãƒã‚°ãƒ©ãƒ ã‚’ã©ã†æ›¸ãã‹ã¨ã„ã†äº‹ã‚’ç¿’ã†æ•™ç§‘書ã¨ã—ã¦ä½¿ã†ã«ã¯ã„ãŸã ã‘ãªã„。ã„ãŸã ã‘ãªã„ç†ç”±ã¯å¤šåˆ†ã„ãã¤ã‚‚ã‚ã‚‹ã‹ã¨æ€ã†ã®ã ã‘ã©ã€ãƒ—ãƒãƒ•ã‚§ãƒƒã‚·ãƒ§ãƒŠãƒ«ã‹ã‚‰è¦‹ã¦ã‚‚ã„ãŸã ã‘ãªã„記述ãŒã„ã£ã±ã„ã‚る。 例ãˆã° if (c >= '0' && c <= '9') ... ã¨ã‹ã„ã†ã‚¤ãƒ‡ã‚£ã‚ªãƒ ã¨ã‹ã€ c - '0' ãªã‚“ã¦ã„ã†ã‚¤ãƒ‡ã‚£ã‚ªãƒ ãŒã„ãŸã‚‹ã¨ã“ã‚(？)ã«ã§ã¦ãã‚‹ã®ã§ã‚ã‚‹ãŒã€
Optimization of Computer Programs in C
Michael E. Lee Senior Programmer/Analyst Ontek Corporation 22941 Mill Creek Road Laguna Hills, CA 92653 USA Abstract: A substantial portion of a knowledge worker's life may be spent waiting for a computer program to produce output. Users and organizations control their wait time by purchasing faster computers, adding memory, or using faster network connections. Developers of application progra
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what malloc(0) should returns?
https://www.hi-matic.org/diary/index.cgi?20131119
http://blog.monoweb.info/blog/2012/07/14/c99-array/
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definition of NULL correct?
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