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util: ignore invalid format specifiers #13674

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@targos targos commented Jun 14, 2017

In util.format, if a percent sign without a known type is encountered,
just print it instead of silently ignoring it and the next character.

Fixes: #13665

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines
Affected core subsystem(s)

util

In util.format, if a percent sign without a known type is encountered,
just print it instead of silently ignoring it and the next character.

Fixes: nodejs#13665
@nodejs-github-bot nodejs-github-bot added the util Issues and PRs related to the built-in util module. label Jun 14, 2017
// Invalid format specifiers
assert.strictEqual(util.format('a% b', 'x'), 'a% b x');
assert.strictEqual(util.format('percent: %d%, fraction: %d', 10, 0.1),
'percent: 10%, fraction: 0.1');
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@TimothyGu TimothyGu Jun 14, 2017

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Maybe also test a % at the end of a string?

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@benjamingr
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+1 on actual changes. Why did you change your mind from the initial suggestion of throwing?

@jasnell jasnell added the semver-major PRs that contain breaking changes and should be released in the next major version. label Jun 14, 2017
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jasnell commented Jun 14, 2017

Defensively marking this as a semver-major. While this change is definitely the right thing to do, the change in behavior could potentially break code written to depend on the old behavior (as unlikely as that may be)

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targos commented Jun 14, 2017

This is actually restoring the old behavior (that was lost in #12407) so I would consider this semver-patch.

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LGTM

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+1 to semver-patch since the old behavior only changed in 8.x

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jasnell commented Jun 15, 2017

If there are no objections to landing as semver-patch then I'm good with that

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jasnell commented Jun 15, 2017

/cc @nodejs/ctc ... we have several CTC signoffs already, just want to make sure there are no objections to landing this as a patch.

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jasnell commented Jun 16, 2017

Landing...

@jasnell jasnell removed the semver-major PRs that contain breaking changes and should be released in the next major version. label Jun 16, 2017
jasnell pushed a commit that referenced this pull request Jun 16, 2017
In util.format, if a percent sign without a known type is encountered,
just print it instead of silently ignoring it and the next character.

PR-URL: #13674
Fixes: #13665
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Timothy Gu <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Daniel Bevenius <[email protected]>
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jasnell commented Jun 16, 2017

Landed in 00aac57

@jasnell jasnell closed this Jun 16, 2017
@targos targos deleted the fix-13665 branch June 16, 2017 17:33
addaleax pushed a commit that referenced this pull request Jun 17, 2017
In util.format, if a percent sign without a known type is encountered,
just print it instead of silently ignoring it and the next character.

PR-URL: #13674
Fixes: #13665
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Timothy Gu <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Daniel Bevenius <[email protected]>
@addaleax addaleax mentioned this pull request Jun 17, 2017
addaleax pushed a commit that referenced this pull request Jun 21, 2017
In util.format, if a percent sign without a known type is encountered,
just print it instead of silently ignoring it and the next character.

PR-URL: #13674
Fixes: #13665
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Timothy Gu <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Daniel Bevenius <[email protected]>
@addaleax addaleax mentioned this pull request Jun 21, 2017
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9 participants