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#include <stdarg.h>
#include <stddef.h>

void func(size_t countnum_vargs, ...) {
  va_list ap;  
  va_start(ap, countnum_vargs);
  if (countnum_vargs > 0) {
    unsigned char c = va_arg(ap, unsigned char);
    // ...
  }
  va_end(ap);
}
 
void f(void) {
  unsigned char c = 0x12;
  func(1, c);
}

#include <stdarg.h>
#include <stddef.h>

void func(size_t countnum_vargs, ...) {
  va_list ap;  
  va_start(ap, countnum_vargs);
  if (countnum_vargs > 0) {
    unsigned char c = (unsigned char) va_arg(ap, int);
    // ...
  }
  va_end(ap);
}

void f(void) {
  unsigned char c = 0x12;
  func(1, c);
}