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[SR-3827] Lines without terminator aren't printed (regression) #46412

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swift-ci opened this issue Feb 2, 2017 · 5 comments
Closed

[SR-3827] Lines without terminator aren't printed (regression) #46412

swift-ci opened this issue Feb 2, 2017 · 5 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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@swift-ci
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swift-ci commented Feb 2, 2017

Previous ID SR-3827
Radar rdar://30308088
Original Reporter zmeyc (JIRA User)
Type Bug
Status Closed
Resolution Done
Environment

OS X, Xcode Version 8.3 beta (8W109m)

Additional Detail from JIRA
Votes 3
Component/s Standard Library
Labels Bug, 3.1Regression
Assignee None
Priority Medium

md5: 59241053894703477ec8dc6f73558394

Issue Description:

Upd: this appears to be Xcode output pane issue.

To reproduce, paste the following code to Playground:

print("A question.")
print("Your answer: ", terminator: "")

"Your answer: " will not appear in Xcode 8.3 beta.
Works as expected in Xcode 8.2.

Flushing stdout doesn't help. We're using a workaround below, but it causes flickering:

for _ in 0...10000  { print("\0", terminator: "") }
@swift-ci
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swift-ci commented Feb 8, 2017

Comment by Andrey Fidrya (JIRA)

Also reproducible on Xcode 8.3 beta 2.

@swift-ci
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swift-ci commented Feb 9, 2017

Comment by Andrey Fidrya (JIRA)

Upd: flushing stdout works in console, but not in Xcode. Neither setbuf(stdout, nil) nor fflush(stdout) helps, so it appears this is an Xcode issue.

import Darwin

setbuf(stdout, nil)

while true {
    print("A question.")
    print("Your answer: ", terminator: "")
    //fflush(stdout)
    
    sleep(1)
    print("")
}

@swift-ci
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Comment by Andrey Fidrya (JIRA)

Has been fixed in Xcode 9.

@hartbit
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hartbit commented Apr 19, 2019

@belkadan I know this is an old issue, but I'm noticing the same behaviour in Swift 5, even in the console. Should we reopen this issue or open a new one?

@belkadan
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New one, I guess. I suspect you're talking about printing without manual flushing (y/n?), so the question is really "should printing with a custom terminator force flushing", and the standard library folks probably have opinions on that.

@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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@hartbit @belkadan @swift-ci