From 973d00665e4ad04402f9f2059bd72ecba745f6e3 Mon Sep 17 00:00:00 2001
From: Chris White <cxwembedded@gmail.com>
Date: Sun, 24 Mar 2024 21:14:38 -0400
Subject: [PATCH] find-file-doc-comments.pl: don't look for a doc comment
 before the file starts

Related to #232
---
 find-file-doc-comments.pl | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/find-file-doc-comments.pl b/find-file-doc-comments.pl
index bb46662..cc61d63 100755
--- a/find-file-doc-comments.pl
+++ b/find-file-doc-comments.pl
@@ -105,6 +105,9 @@ sub main {
         # back to it manually.  Move to the first line that might be a doc comment.
         --$lineno;
 
+        # If we ran off the beginning of the file, there's no doc comment.
+        next if $lineno <= 0;
+
         # TODO make sure we're not still in the definition.
         # E.g., memblock.h:for_each_mem_range().  The defintion is reported
         # on the second line of the #define, not the first line.