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[SR-13403] UTF-8 decoding truncates replacement character #55844

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belkadan opened this issue Aug 15, 2020 · 2 comments
Closed

[SR-13403] UTF-8 decoding truncates replacement character #55844

belkadan opened this issue Aug 15, 2020 · 2 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. standard library Area: Standard library umbrella

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@belkadan
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Previous ID SR-13403
Radar None
Original Reporter @belkadan
Type Bug
Status Resolved
Resolution Duplicate
Environment

Apple Swift 5.2.4

Additional Detail from JIRA
Votes 0
Component/s Standard Library
Labels Bug
Assignee None
Priority Medium

md5: 3cc506ee44670166398aa02de6d2828e

duplicates:

  • SR-8111 Weird issue when printing String with unicode character

Issue Description:

% xcrun swift                                           
impWelcome to Apple Swift version 5.2.4 (swiftlang-1103.0.32.9 clang-1103.0.32.53).
Type :help for assistance.
  1> String(decoding: [0x80], as: UTF8.self)
$R0: String = "\u{ef}"

What's ef? Turns out it's a truncated form of the replacement character U+FFFD, which encodes as EF BF BD in UTF-8. I'm not sure why it's getting truncated, though.

(Aside: Why am I using init(decoding:as:)? Because Foundation's decoding just fails on bad code units rather than falling back to a replacement character.)
@poya
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poya commented Aug 16, 2020

Looks like duplicate of lldb formatting issue SR-8111. Should be resolved in master and 5.3

@belkadan
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I didn't even think about the fact that both Playgrounds and the REPL run through LLDB. Thanks, Martin!

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. standard library Area: Standard library umbrella
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@poya @belkadan