Redo yesterday's buf_writer-wrapper in a less silly and convoluted way. Add integer stringifying functions to _int module.

1 files changed, 44 insertions, 0 deletions

diff --git a/src/lib/_int.rs b/src/lib/_int.rs
index 9b756675..03017259 100644
--- a/src/lib/_int.rs
+++ b/src/lib/_int.rs
@@ -44,3 +44,47 @@ fn next_power_of_two(uint n) -> uint {
   }
   ret tmp + 1u;
 }
+
+fn uto_string(mutable uint n, uint radix) -> str
+{
+  check (0u < radix && radix <= 16u);
+  fn digit(uint n) -> str {
+    alt (n) {
+      case (0u) { ret "0"; }
+      case (1u) { ret "1"; }
+      case (2u) { ret "2"; }
+      case (3u) { ret "3"; }
+      case (4u) { ret "4"; }
+      case (5u) { ret "5"; }
+      case (6u) { ret "6"; }
+      case (7u) { ret "7"; }
+      case (8u) { ret "8"; }
+      case (9u) { ret "9"; }
+      case (10u) { ret "A"; }
+      case (11u) { ret "B"; }
+      case (12u) { ret "C"; }
+      case (13u) { ret "D"; }
+      case (14u) { ret "E"; }
+      case (15u) { ret "F"; }
+    }
+  }
+
+  if (n == 0u) { ret "0"; }
+
+  let str s = "";
+  while (n > 0u) {
+    s = digit(n % radix) + s;
+    n /= radix;
+  }
+  ret s;
+}
+
+fn to_string(mutable int n, uint radix) -> str
+{
+  check (0u < radix && radix <= 16u);
+  if (n < 0) {
+    ret "-" + uto_string((-n) as uint, radix);
+  } else {
+    ret uto_string(n as uint, radix);
+  }
+}