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84 lines
1.7 KiB
Plaintext
84 lines
1.7 KiB
Plaintext
import VTSequence from "@/components/VTSequence";
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# Cursor Backward Tabulation (CBT)
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<VTSequence sequence={["CSI", "Pn", "Z"]} />
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Move the cursor `n` tabs left.
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The leftmost valid column for this operation is the first column. If
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[origin mode](#TODO) is enabled, then the leftmost valid column for this
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operation is the [left margin](#TODO).
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Move the cursor left until the cursor position is on a tabstop. If the
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cursor would move past the leftmost valid column, the cursor remains at
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the leftmost valid column and the operation completes. Repeat this process
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`n` times.
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Tabstops are dynamic and can be set with escape sequences such as
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[horizontal tab set (HTS)](/vt/hts), [tab clear (TBC)](/vt/tbc), etc.
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A terminal emulator may default tabstops at any interval, though an interval
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of 8 spaces is most common.
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## Validation
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### CBT V-1: Left Beyond First Column
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```bash
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printf "\033[?W" # reset tab stops
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printf "\033[10Z"
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printf "A"
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```
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```
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|Ac________|
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```
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### CBT V-2: Left Starting After Tab Stop
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```bash
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printf "\033[?W" # reset tab stops
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printf "\033[1;10H"
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printf "X"
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printf "\033[Z"
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printf "A"
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```
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```
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|________AX|
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```
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### CBT V-3: Left Starting on Tabstop
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```bash
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printf "\033[?W" # reset tab stops
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printf "\033[1;9H"
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printf "X"
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printf "\033[1;9H"
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printf "\033[Z"
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printf "A"
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```
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```
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|A_______X_|
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```
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### CBT V-4: Left Margin with Origin Mode
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```bash
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printf "\033[1;1H" # move to top-left
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printf "\033[0J" # clear screen
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printf "\033[?W" # reset tab stops
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printf "\033[?6h" # enable origin mode
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printf "\033[?69h" # enable left/right margins
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printf "\033[3;6s" # scroll region left/right
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printf "\033[1;2H" # move cursor in region
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printf "X"
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printf "\033[Z"
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printf "A"
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```
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```
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|__AX______|
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```
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