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WriteCharsLegacy: Accumulated bugs #14705

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opened 2026-01-31 04:17:24 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 04:17:24 +00:00
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Originally created by @DHowett on GitHub (Jul 27, 2021).

Originally assigned to: @DHowett, @lhecker on GitHub.

Inserting a tab character that would put us at the right edge of the buffer inserts two tabs (one to get us to the right edge of the buffer, one more after we wrap)

Code and example 
#include <windows.h>
int main() {
        CONSOLE_SCREEN_BUFFER_INFOEX csbiex{};
        csbiex.cbSize = sizeof(csbiex);
        GetConsoleScreenBufferInfoEx(GetStdHandle(STD_OUTPUT_HANDLE), &csbiex);
        SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), COORD{(SHORT)(csbiex.dwSize.X - 9), csbiex.dwCursorPosition.Y});
        WriteConsoleW(GetStdHandle(STD_OUTPUT_HANDLE), L"|\t|\n", 4, nullptr, nullptr);
        return 0;
}

image

Inserting a printable control character at the right edge of the screen (ala ^A) when only the ^ would fit emits a ^ and a space.

Example

image
(here, ^D)

Inserting a printable control character (^D) at the right edge of the screen when both ^ and D fit and then backspacing it deletes the ^, not the D:

Example

image

Originally created by @DHowett on GitHub (Jul 27, 2021). Originally assigned to: @DHowett, @lhecker on GitHub. Inserting a tab character that would put us at the right edge of the buffer inserts two tabs (one to get us to the right edge of the buffer, one more after we wrap) <details> <summary>Code and example</summary> ```c++ #include <windows.h> int main() { CONSOLE_SCREEN_BUFFER_INFOEX csbiex{}; csbiex.cbSize = sizeof(csbiex); GetConsoleScreenBufferInfoEx(GetStdHandle(STD_OUTPUT_HANDLE), &csbiex); SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), COORD{(SHORT)(csbiex.dwSize.X - 9), csbiex.dwCursorPosition.Y}); WriteConsoleW(GetStdHandle(STD_OUTPUT_HANDLE), L"|\t|\n", 4, nullptr, nullptr); return 0; } ``` ![image](https://user-images.githubusercontent.com/189190/127206696-16a6dd41-37f7-43d7-892a-621856b57b57.png) </details> Inserting a printable control character at the right edge of the screen (ala `^A`) when only the `^` would fit emits a `^` and a space. <details> <summary>Example</summary> ![image](https://user-images.githubusercontent.com/189190/127206882-e0d6bd1b-b866-4e85-abf6-60f6ea0bf81f.png) (here, `^D`) </details> Inserting a printable control character (`^D`) at the right edge of the screen when both `^` and `D` fit and then backspacing it deletes the `^`, not the `D`: <details> <summary>Example</summary> ![image](https://user-images.githubusercontent.com/189190/127206980-661c5abe-d1ce-4e46-b134-7a8191506507.png) </details>
claunia added the Product-ConhostArea-OutputIssue-BugIn-PRImpact-Correctness labels 2026-01-31 04:17:24 +00:00
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Reference: starred/terminal#14705
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