implementation de printf

printf.c

#include <stdarg.h>

void format(char * f, va_list ap);
int printf(char *f,...){
  va_list ap;
  va_start(ap, f);
  char retour asm ("reto");/* point de retour*/
  asm("push %eipd\r\npop reto");//on affecte la valeur à reto
  format(f,ap);
  va_end(ap);
}

void format(char * f, va_list ap){
  while(*f){
    if (*f!='%'){
      asm("push %0": : "r" (*f));
    }else
      if(*(f+1)=='s'){//juste s sans traiter length
        char * c = &(va_arg(ap, char));
        while(*c){
          asm("push %0": : "r" (*c));
          c++;
        }
        f++;
      }
  }
  asm volatile("mov %ebp %esp");
  asm volatile("add $12, reto")
   asm volatile("mov reto, %eip");
}