+ if (b->next_bio == NULL) return(0);
+ switch (cmd)
+ {
+ default:
+ ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
+ break;
+ }
+ return(ret);
+ }
+
+static void longswap(void *_ptr, size_t len)
+{ const union { long one; char little; } is_endian = {1};
+
+ if (is_endian.little) {
+ size_t i;
+ unsigned char *p=_ptr,c;
+
+ for(i= 0;i < len;i+= 4) {
+ c=p[0],p[0]=p[3],p[3]=c;
+ c=p[1],p[1]=p[2],p[2]=c;
+ }