Description Farnaz Behrang 2012-12-11 18:01:02 EST

In the following program...
==========
#include <stdarg.h>
 void gmp_sscanf (va_list args, const char *fmt, ...){
 va_start(args, fmt); //extract
 }
int main() {
 va_list args;
 const char *fmt;
 gmp_sscanf(args,fmt);
 return 0;
}
==========

...if you select the statement on line 3 and invoke the Extract Function refactoring, CDT produces the following code:

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#include <stdarg.h>

void extracted_function(va_list args, const char* fmt) {
	va_start(args, fmt);
}

void gmp_sscanf(va_list args, const char *fmt, ...) {
	extracted_function(args, fmt);
 }
int main() {
 va_list args;
 const char *fmt;
 gmp_sscanf(args,fmt);
 return 0;
}
==========

va_start can only be used in a varargs function.