Variadic arguments
Variadic functions are functions that may be called with different number of arguments.
# Notes
Although old-style (prototype-less) function declarations allow the subsequent function calls to use any number of arguments, they are not allowed to be variadic (as of C89). The definition of such function must specify a fixed number of parameters and cannot use the stdarg.h macros.
# Example
#include <stdio.h>
#include <time.h>
#include <stdarg.h>
void tlog(const char* fmt,...)
{
char msg[50];
strftime(msg, sizeof msg, "%T", localtime(&(time_t){time(NULL)}));
printf("[%s] ", msg);
va_list args;
va_start(args, fmt);
vprintf(fmt, args);
va_end(args);
}
int main(void)
{
tlog("logging %d %d %d...\n", 1, 2, 3);
}