C test: var-args, like printf()

result.txt

❯❯❯ gcc variable_length_arg_func.c && ./a.out
var:01

var1:11 var2:12

var1:F1 var2:F2 var3:F3

variable_arg_length.c

#include <stdio.h>
#include <stdarg.h>

void my_printf(const char* fmt, ...)
{
    char buf[100];

    va_list ap;

    va_start(ap, fmt);
    vsprintf(buf, fmt, ap);
    va_end(ap);

    puts(buf);
}


int main()
{
    my_printf("var:%02X\n", 0x01);
    my_printf("var1:%02X var2:%02X\n", 0x11, 0x12);
    my_printf("var1:%02X var2:%02X var3:%02X\n", 0xf1, 0xf2, 0xf3);
}