* flonum->string now uses a bytevector as the intermediate buffer.

bin/ikarus-flonums.c

@@ -127,33 +127,26 @@ ikrt_fx_atan(ikp x, ikpcb* pcb){
   return r;
 }
 
-
-
-
-
-
-
-
-
 ikp
-ikrt_flonum_to_string(ikp x, ikpcb* pcb){
+ikrt_flonum_to_bytevector(ikp x, ikp bv, ikpcb* pcb){
   if(tagof(x) == vector_tag){
     if(ref(x,-vector_tag) == flonum_tag){
-      char buff[80];
-      int n = snprintf(buff, sizeof(buff)-2, "%.12G", flonum_data(x));
+      char* buff = (char*) bv + off_bytevector_data;
+      int len = unfix(ref(bv, off_bytevector_data));
+      int n = snprintf(buff, len-2, "%.12G", flonum_data(x));
       if(n >= 0){
         int i=0;
         while ((i<n) && (buff[i] != '.')){ i++; }
         if(i == n){
           buff[i] = '.';
           buff[i+1] = '0';
-          n += 2;;
+          buff[i+2] = 0;
+          n += 2;
+        } else {
+          buff[n] = 0;
         }
-        ikp str = ik_alloc(pcb, align(n+disp_string_data+1)) +
-          string_tag;
-        ref(str, -string_tag) = fix(n);
-        memcpy(string_data(str), buff, n);
-        return str;
+        ref(bv, off_bytevector_length) = fix(n);
+        return bv;
       }
     }
   }

src/ikarus.numerics.ss

@@ -7,11 +7,14 @@
 (library (ikarus flonums)
   (export string->flonum flonum->string)
   (import 
+    (ikarus system $bytevectors)
     (except (ikarus) flonum->string string->flonum))
   
   (define (flonum->string x)
-    (or (foreign-call "ikrt_flonum_to_string" x)
-        (error 'flonum->string "~s is not a flonum" x)))
+    (utf8-bytevector->string
+      (or (foreign-call "ikrt_flonum_to_bytevector" x
+            (make-bytevector 80 0))
+          (error 'flonum->string "~s is not a flonum" x))))
   
   (define (string->flonum x)
     (cond
@@ -376,7 +379,7 @@
       (cond
         [(fixnum? x) (fixnum->string x)]
         [(bignum? x) (foreign-call "ikrt_bntostring" x)]
-        [(flonum? x) (foreign-call "ikrt_flonum_to_string" x)]
+        [(flonum? x) (flonum->string x)]
         [else (error 'number->string "~s is not a number" x)])))
 
   (define modulo