print "0" for null string

45854caa · rsc · d90113b6 · 45854caa
--- a/console.c
+++ b/console.c
@@ -129,10 +129,14 @@ cprintf(char *fmt, ...)
      } else if(c == 's'){
        char *s = (char*)*ap;
        ap++;
+        if(s == 0){
+          cons_putc('0');
+        }else{
          while(*s != 0){
            cons_putc(*s);
            s++;
          }
+        }
      } else if(c == '%'){
        cons_putc(c);
      } else {