Variadic arguments fail when they get less than expected number of parameters.

variadic_arguments.c

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

int process(int param, va_list var_args)
{
    printf("\nThe First Param : %d", param);
    
    char* name = va_arg(var_args, char*);
    if(NULL != name)
        printf(" \nThe String Param I Expect : %s", name);
    else
        printf("\nYou have not sent the expected second param.s ...");
        
    return 0;
}

int my_variadic_function(int first_param, ...)
{
    int ret;
    va_list variadic_arguments;
    
    va_start(variadic_arguments, first_param);

    ret = process(first_param, variadic_arguments);

    va_end(variadic_arguments);
    
    return ret;
}



int main()
{
    my_variadic_function(22, "Mustafa");
    
    // Since the implementation expect 2 arguments, 
    // it fails if less than expected is provided
    
    // Uncomment the line below to get error.
    // my_variadic_function(22);               // Segmentation fault (core dumped)
    
    return 0;
}