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Redo _uint.to_str to work with chars and only one tmp str, built left-to-right.

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This commit is contained in:
Graydon Hoare 2010-08-20 15:37:20 -07:00
parent db377bae3a
commit a2bd79a6ac
1 changed files with 37 additions and 19 deletions
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56
src/lib/_uint.rs
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@ -36,33 +36,51 @@ fn next_power_of_two(uint n) -> uint {
fn to_str(mutable uint n, uint radix) -> str
{
check (0u < radix && radix <= 16u);
fn digit(uint n) -> str {
fn digit(uint n) -> char {
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"; }
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 uint r = 1u;
if (n > r) {
while ((r*radix) < n) {
r *= radix;
}
}
let str s = "";
while (n > 0u) {
s = digit(n % radix) + s;
n /= radix;
auto i = n/r;
n -= (i * r);
r /= radix;
s += digit(i) as u8;
}
while (r > 0u) {
s += '0' as u8;
r /= radix;
}
ret s;
}