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[PR #16898] Fix a ReadConsoleOutputCharacter regression #31040

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opened 2026-01-31 09:44:43 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:44:43 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/16898

State: closed
Merged: Yes

The nLength parameter of ReadConsoleOutputCharacterW indicates
the number of columns that should be read. For single-column (narrow)
surrogate pairs this previously clipped a trailing character of the
returned string. In the major Unicode support update in #13626
surrogate pairs truly got stored as atomic units for the first time.
This now meant that a 120 column read with such codepoints resulted
in 121 characters. Other parts of conhost still assume UCS2 however,
and so this results in the entire read failing.

This fixes the issue by turning surrogate pairs into U+FFFD
which makes it UCS2 compatible.

Closes #16892

Validation Steps Performed

  • Write U+F15C0 and read it back with ReadConsoleOutputCharacterW
  • Read succeeds with a single U+FFFD ✅
**Original Pull Request:** https://github.com/microsoft/terminal/pull/16898 **State:** closed **Merged:** Yes --- The `nLength` parameter of `ReadConsoleOutputCharacterW` indicates the number of columns that should be read. For single-column (narrow) surrogate pairs this previously clipped a trailing character of the returned string. In the major Unicode support update in #13626 surrogate pairs truly got stored as atomic units for the first time. This now meant that a 120 column read with such codepoints resulted in 121 characters. Other parts of conhost still assume UCS2 however, and so this results in the entire read failing. This fixes the issue by turning surrogate pairs into U+FFFD which makes it UCS2 compatible. Closes #16892 ## Validation Steps Performed * Write U+F15C0 and read it back with `ReadConsoleOutputCharacterW` * Read succeeds with a single U+FFFD ✅
claunia added the pull-request label 2026-01-31 09:44:43 +00:00
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Reference: starred/terminal#31040
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