gbranden pushed a commit to branch master
in repository groff.
commit c84c754f6748cb5d7cd3b903a90fc8ad11297b10
Author: G. Branden Robinson <[email protected]>
AuthorDate: Tue Jan 6 04:13:17 2026 -0600
[mm]: Validate arguments to `H` macro.
* contrib/mm/m.tmac (H): Throw error diagnostic if not given mandatory
argument, or the first argument ("level") is not an arithmetic
expression.
---
contrib/mm/ChangeLog | 6 ++++++
contrib/mm/m.tmac | 2 ++
2 files changed, 8 insertions(+)
diff --git a/contrib/mm/ChangeLog b/contrib/mm/ChangeLog
index 16e02b46e..9bb7b60e1 100644
--- a/contrib/mm/ChangeLog
+++ b/contrib/mm/ChangeLog
@@ -1,3 +1,9 @@
+2026-01-06 G. Branden Robinson <[email protected]>
+
+ * m.tmac (H): Throw error diagnostic if not given mandatory
+ argument, or the first argument ("level") is not an arithmetic
+ expression.
+
2025-12-23 Alexis Hildebrandt <[email protected]>
[mm]: Fix Savannah #67857.
diff --git a/contrib/mm/m.tmac b/contrib/mm/m.tmac
index 3f7398b60..6587eddf7 100644
--- a/contrib/mm/m.tmac
+++ b/contrib/mm/m.tmac
@@ -1179,6 +1179,8 @@ numeric; got '\\$1'
..
.\"-------------
.de H
+.if \\n[.$]=0 .@error \\$0: expected 1 to 3 arguments, got \\n[.$]
+.if !\B'\\$1' .@error \\$0: level argument is not numeric: '\\$1'
\\*[debug@dump-args]\\
.if !r hd*cur-bline .nr hd*cur-bline \\n[nl]
.br
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