diff options
Diffstat (limited to 'src/libcore/char.rs')
| -rw-r--r-- | src/libcore/char.rs | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/src/libcore/char.rs b/src/libcore/char.rs index b76571864e0..802aaf12bdd 100644 --- a/src/libcore/char.rs +++ b/src/libcore/char.rs @@ -126,16 +126,18 @@ pub pure fn to_digit(c: char, radix: uint) -> Option<uint> { * - chars in [0x100,0xffff] get 4-digit escapes: `\\uNNNN` * - chars above 0x10000 get 8-digit escapes: `\\UNNNNNNNN` */ -pub fn escape_unicode(c: char) -> ~str { +pub pure fn escape_unicode(c: char) -> ~str { let s = u32::to_str(c as u32, 16u); let (c, pad) = (if c <= '\xff' { ('x', 2u) } else if c <= '\uffff' { ('u', 4u) } else { ('U', 8u) }); assert str::len(s) <= pad; let mut out = ~"\\"; - str::push_str(&mut out, str::from_char(c)); - for uint::range(str::len(s), pad) |_i| { str::push_str(&mut out, ~"0"); } - str::push_str(&mut out, s); + unsafe { + str::push_str(&mut out, str::from_char(c)); + for uint::range(str::len(s), pad) |_i| { str::push_str(&mut out, ~"0"); } + str::push_str(&mut out, s); + } move out } @@ -151,7 +153,7 @@ pub fn escape_unicode(c: char) -> ~str { * - Any other chars in the range [0x20,0x7e] are not escaped. * - Any other chars are given hex unicode escapes; see `escape_unicode`. */ -pub fn escape_default(c: char) -> ~str { +pub pure fn escape_default(c: char) -> ~str { match c { '\t' => ~"\\t", '\r' => ~"\\r", |