[groff] 06/19: [troff]: Disclose more context in error diag.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 5d19e2753431ad3cfa4d6505c1e3f4a89005d92c
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Tue Sep 17 11:47:36 2024 -0500

    [troff]: Disclose more context in error diag.
    
    * src/roff/troff/input.cpp (decode_string_args): Improve error
      diagnostic to disclose more context.
---
 ChangeLog                | 5 +++++
 src/roff/troff/input.cpp | 3 ++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index dccb07ea4..275a6baa5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2024-09-17  G. Branden Robinson <g.branden.robinson@gmail.com>
+
+       * src/roff/troff/input.cpp (decode_string_args): Improve
+       error diagnostic to disclose more context.
+
 2024-09-21  G. Branden Robinson <g.branden.robinson@gmail.com>
 
        * src/roff/troff/input.cpp (close_stream): Handle being given a
diff --git a/src/roff/troff/input.cpp b/src/roff/troff/input.cpp
index 00dc10ebb..f93cbe91c 100644
--- a/src/roff/troff/input.cpp
+++ b/src/roff/troff/input.cpp
@@ -4106,6 +4106,7 @@ static void decode_args(macro_iterator *mi)
   }
 }
 
+// XXX: This is a misnomer.  It's used to read stuff like `\[e aa]` too.
 static void decode_string_args(macro_iterator *mi)
 {
   node *n;
@@ -4114,7 +4115,7 @@ static void decode_string_args(macro_iterator *mi)
     while (c == ' ')
       c = get_copy(&n);
     if (c == '\n' || c == EOF) {
-      error("missing ']'");
+      error("missing ']' in parameterized escape sequence");
       break;
     }
     if (c == ']')