[lldb] Use 1 based row and column for statusline #143385
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I can't find a proper source for this but many materials say that ANSI rows and columns start at 1 not 0. https://www2.math.upenn.edu/~kazdan/210/computer/ansi.html is as good as I can get: <row> is a number from 1 through 25 that specifies the row to which the cursor is to be moved. <col> is a number from 1 through 80 that specifies the column to which the cursor is to be moved. 0 does work in Windows terminal and Linux terminals, but we might as well be correct. From what I read, some terminals correct 0 back to 1 and some treat 0 as a missing argument, which also defaults to 1.
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@llvm/pr-subscribers-lldb Author: David Spickett (DavidSpickett) ChangesI can't find a proper source for this but many materials say that ANSI rows and columns start at 1 not 0. https://www2.math.upenn.edu/~kazdan/210/computer/ansi.html is as good as I can get: 0 does work in Windows terminal and Linux terminals, but we might as well be correct and it's one less thing to reason about when auditing this code. From what I read, some terminals correct 0 back to 1 and some treat 0 as a missing argument, which also defaults to 1. Full diff: https://github.com/llvm/llvm-project/pull/143385.diff 1 Files Affected:
diff --git a/lldb/source/Core/Statusline.cpp b/lldb/source/Core/Statusline.cpp
index 52f6134123b76..8a8640805cac0 100644
--- a/lldb/source/Core/Statusline.cpp
+++ b/lldb/source/Core/Statusline.cpp
@@ -24,8 +24,8 @@
#define ANSI_SAVE_CURSOR ESCAPE "7"
#define ANSI_RESTORE_CURSOR ESCAPE "8"
#define ANSI_CLEAR_BELOW ESCAPE "[J"
-#define ANSI_SET_SCROLL_ROWS ESCAPE "[0;%ur"
-#define ANSI_TO_START_OF_ROW ESCAPE "[%u;0f"
+#define ANSI_SET_SCROLL_ROWS ESCAPE "[1;%ur"
+#define ANSI_TO_START_OF_ROW ESCAPE "[%u;1f"
#define ANSI_REVERSE_VIDEO ESCAPE "[7m"
#define ANSI_UP_ROWS ESCAPE "[%dA"
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tomtor
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Jun 14, 2025
I can't find a proper source for this but many materials say that ANSI rows and columns start at 1 not 0. https://www2.math.upenn.edu/~kazdan/210/computer/ansi.html is as good as I can get: ``` <row> is a number from 1 through 25 that specifies the row to which the cursor is to be moved. <col> is a number from 1 through 80 that specifies the column to which the cursor is to be moved. ``` 0 does work in Windows terminal and Linux terminals, but we might as well be correct and it's one less thing to reason about when auditing this code. From what I read, some terminals correct 0 back to 1 and some treat 0 as a missing argument, which also defaults to 1.
JDevlieghere
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to swiftlang/llvm-project
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Jul 3, 2025
I can't find a proper source for this but many materials say that ANSI rows and columns start at 1 not 0. https://www2.math.upenn.edu/~kazdan/210/computer/ansi.html is as good as I can get: ``` <row> is a number from 1 through 25 that specifies the row to which the cursor is to be moved. <col> is a number from 1 through 80 that specifies the column to which the cursor is to be moved. ``` 0 does work in Windows terminal and Linux terminals, but we might as well be correct and it's one less thing to reason about when auditing this code. From what I read, some terminals correct 0 back to 1 and some treat 0 as a missing argument, which also defaults to 1. (cherry picked from commit 6ec48b4)
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I can't find a proper source for this but many materials say that ANSI rows and columns start at 1 not 0.
https://www2.math.upenn.edu/~kazdan/210/computer/ansi.html is as good as I can get:
0 does work in Windows terminal and Linux terminals, but we might as well be correct and it's one less thing to reason about when auditing this code.
From what I read, some terminals correct 0 back to 1 and some treat 0 as a missing argument, which also defaults to 1.