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#include <stdio.h>
#include <stdarg.h>
 
void foo( unsigned char a, 
	  unsigned char b, 
	  unsigned char c, 
	  ...  )
{
	va_list ap;
	unsigned char d;
	/*unsigned char *d = &a - 4;
 
        printf( "c: %p\nb: %p\na: %p\n", 
                (void *)&c, 
                (void *)&b, 
                (void *)&a );
        printf( "d: %hhu\n", 
		*d );*/
 
	va_start( ap, c );
	d = va_arg( ap, unsigned char);
	va_end( ap );
	printf( "%hhu\n", d );
}
 
 
 
int main(void)
{
        foo( 1, 2, 3, 4 );
 
 
        return 0;
}
 

cc1: warnings being treated as errors
prog.c: In function ‘foo’:
prog.c:21: error: ‘unsigned char’ is promoted to ‘int’ when passed through ‘...’
prog.c:21: note: (so you should pass ‘int’ not ‘unsigned char’ to ‘va_arg’)
prog.c:21: note: if this code is reached, the program will abort

Standard output is empty