{"id":11615,"date":"2022-09-28T01:40:18","date_gmt":"2022-09-27T20:10:18","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-variable-arguments-in-c-functions\/"},"modified":"2022-09-28T01:40:18","modified_gmt":"2022-09-27T20:10:18","slug":"solved-variable-arguments-in-c-functions","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-variable-arguments-in-c-functions\/","title":{"rendered":"[Solved] Variable arguments in C functions"},"content":{"rendered":"

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c itself doesn’t specify things like “heap” or “stack”, so programming standard and portable c, you should better think in categories of the c standard: static, automatic and dynamic storage.<\/p>\n

Nevertheless, in a typical implementation, “automatic storage” translates to “the stack is used for it”. This is the case for function arguments and variadic functions are no exception here.<\/p>\n

The reason va_end()<\/code> might free some dynamic storage (typically: allocated on the heap) is that the va_arg()<\/code> macro typically needs some context information to find the next<\/em> argument. va_start()<\/code> will allocate the memory for that information<\/strong> (not for the arguments themselves) and initialize it in a way so that the first va_arg()<\/code> call returns the first variadic argument.<\/p>\n

Note that an implementation of va_start()<\/code> doesn’t have<\/strong> to allocate memory. va_list<\/code> might be defined in a way that it provides the space for the required context information. But that should be of no interest at all<\/em> to you as the programmer, all the va_*<\/code> stuff is a black box<\/em> for you and if the documentation states “call va_end()<\/code> when done for cleanup”, you just do it \ud83d\ude09<\/p>\n<\/p><\/div>\n

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solved Variable arguments in C functions <\/p>\n","protected":false},"excerpt":{"rendered":"

[ad_1] c itself doesn’t specify things like “heap” or “stack”, so programming standard and portable c, you should better think in categories of the c standard: static, automatic and dynamic storage. Nevertheless, in a typical implementation, “automatic storage” translates to “the stack is used for it”. This is the case for function arguments and variadic … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,378,3175],"class_list":["post-11615","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-heap-memory","tag-stack-memory"],"yoast_head":"\n[Solved] Variable arguments in C functions - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-variable-arguments-in-c-functions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Variable arguments in C functions - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] c itself doesn’t specify things like “heap” or “stack”, so programming standard and portable c, you should better think in categories of the c standard: static, automatic and dynamic storage. 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