https://code-reference.com/ 2026-06-21T05:29:21+02:00 https://code-reference.com/ https://code-reference.com/ttps://code-reference.com/lib/tpl/dokuwiki/images/favicon.ico text/html 2024-02-16T01:05:46+02:00 https://code-reference.com/c/stdarg.h/va_arg?rev=1708041946&do=diff type va_arg(va_list ap, type); description The va_arg() macro expands to an expression that has the type and value of the next argument in the call. The argument ap is the va_list ap initialized by va_start(). Each call to va_arg() modifies ap so that the next call returns the next argument. The argument type is a type name specified so that the type of a pointer to an object that has the specified type can be obtained simply by adding a * to type… text/html 2024-02-16T01:05:46+02:00 https://code-reference.com/c/stdarg.h/va_copy?rev=1708041946&do=diff void va_copy(va_list dest, va_list src); An obvious implementation would have a va_list be a pointer to the stack frame of the variadic function. In such a setup (by far the most common) there seems nothing against an assignment va_list aq = ap; Unfortunately, there are also systems that make it an array of pointers (of length 1), and there one needs va_list aq; *aq = *ap; Finally, on systems where… text/html 2024-02-16T01:05:46+02:00 https://code-reference.com/c/stdarg.h/va_end?rev=1708041946&do=diff void va_end(va_list ap); description Each invocation of va_start() must be matched by a corresponding invocation of va_end() in the same function. After the call va_end(ap) the variable ap is undefined. Multiple traversals of the list, each bracketed by va_start() and va_end() are possible. va_end() may be a macro or a function. text/html 2013-02-28T20:32:31+02:00 https://code-reference.com/c/stdarg.h/va_list?rev=1362079951&do=diff va_list argPointer; description va_list is a data type that is used for the macro variable arguments in function calls with any number of arguments to keep the arguments in a list. It is only for the macros va_start (), va_arg, va_end () function. text/html 2024-02-16T01:05:46+02:00 https://code-reference.com/c/stdarg.h/va_start?rev=1708041946&do=diff void va_start(va_list ap, argN); description The va_start() macro initializes ap for subsequent use by va_arg() and va_end(), and must be called first. The argument last is the name of the last argument before the variable argument list, that is, the last argument of which the calling function knows the type. Because the address of this argument may be used in the va_start() macro, it should not be declared as a register variable, or…