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#include <stdio.h>
 
printf_(fmt,x1,x2,x3,x4,x5,x6,x7,x8,x9)
	char fmt[];
	{
	char s[];
	auto adx[], x, c;
 
	adx = &x1; /* argument pointer */
loop:
	while((c = *fmt++) != '%') {
		if(c == '\0')
			return;
		putchar(c);
	}
	x = *adx++;
	switch (c = *fmt++) {
 
	case 'd': /* decimal */
	case 'o': /* octal */
		if(x < 0) {
			x = -x;
			if(x<0) {  	/* is - infinity */
				if(c=='o')
					printf("100000");
				else
					printf("-32768");
				goto loop;
			}
			putchar('-');
		}
		printn(x, c=='o'?8:10);
		goto loop;
 
	case 'c': /* char */
		putchar(x);
		goto loop;
 
	case 's': /* string */
		s = x;
		while(c = *s++)
			putchar(c);
		goto loop;
	}
	putchar('%');
	fmt--;
	adx--;
	goto loop;
}
 
int main(void)
{
	printf_("abc %d\n", 11);
	return 0;
}

prog.c:3:1: warning: return type defaults to 'int' [-Wimplicit-int]
 printf_(fmt,x1,x2,x3,x4,x5,x6,x7,x8,x9)
 ^
prog.c: In function 'printf_':
prog.c:3:1: warning: type of 'x1' defaults to 'int' [-Wimplicit-int]
prog.c:3:1: warning: type of 'x2' defaults to 'int' [-Wimplicit-int]
prog.c:3:1: warning: type of 'x3' defaults to 'int' [-Wimplicit-int]
prog.c:3:1: warning: type of 'x4' defaults to 'int' [-Wimplicit-int]
prog.c:3:1: warning: type of 'x5' defaults to 'int' [-Wimplicit-int]
prog.c:3:1: warning: type of 'x6' defaults to 'int' [-Wimplicit-int]
prog.c:3:1: warning: type of 'x7' defaults to 'int' [-Wimplicit-int]
prog.c:3:1: warning: type of 'x8' defaults to 'int' [-Wimplicit-int]
prog.c:3:1: warning: type of 'x9' defaults to 'int' [-Wimplicit-int]
prog.c:6:7: error: array size missing in 's'
  char s[];
       ^
prog.c:7:7: warning: type defaults to 'int' in declaration of 'adx' [-Wimplicit-int]
  auto adx[], x, c;
       ^
prog.c:7:7: error: array size missing in 'adx'
prog.c:7:14: warning: type defaults to 'int' in declaration of 'x' [-Wimplicit-int]
  auto adx[], x, c;
              ^
prog.c:7:17: warning: type defaults to 'int' in declaration of 'c' [-Wimplicit-int]
  auto adx[], x, c;
                 ^
prog.c:9:6: error: assignment to expression with array type
  adx = &x1; /* argument pointer */
      ^
prog.c:13:4: warning: 'return' with no value, in function returning non-void
    return;
    ^
prog.c:16:10: error: lvalue required as increment operand
  x = *adx++;
          ^
prog.c:32:3: warning: implicit declaration of function 'printn' [-Wimplicit-function-declaration]
   printn(x, c=='o'?8:10);
   ^
prog.c:40:5: error: assignment to expression with array type
   s = x;
     ^
prog.c:41:15: error: lvalue required as increment operand
   while(c = *s++)
               ^
prog.c:47:5: error: lvalue required as decrement operand
  adx--;
     ^

Standard output is empty