From 3ef25acf3600fb822bdf1487036184b4978d737f Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Sun, 28 Dec 2025 16:04:28 +0200
Subject: [PATCH] Add a script to auto-generate mapping from exterr category to
 source file

Reviewed by:	emaste, mkusick
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D54380
---
 tools/build/make_libc_exterr_cat_filenames.sh | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100755 tools/build/make_libc_exterr_cat_filenames.sh

diff --git a/tools/build/make_libc_exterr_cat_filenames.sh b/tools/build/make_libc_exterr_cat_filenames.sh
new file mode 100755
index 00000000000..fbde8589120
--- /dev/null
+++ b/tools/build/make_libc_exterr_cat_filenames.sh
@@ -0,0 +1,22 @@
+#!/bin/sh
+set -e
+
+check="lib/libc/gen/uexterr_format.c"
+target="lib/libc/gen/exterr_cat_filenames.h"
+
+if [ \! -f "${check}" ] ; then
+    echo "Script must be run from the top of the full source tree"
+    exit 1
+fi
+
+echo "/*" >"${target}"
+printf " * Automatically %sgenerated, use\\n" \@ >>"${target}"
+echo " * tools/build/make_libc_exterr_cat_filenames.sh" >>"${target}"
+echo " */" >>"${target}"
+
+(find sys -type f -name '*.c' | \
+    xargs grep -E '^#define[[:space:]]+EXTERR_CATEGORY[[:space:]]+EXTERR_CAT_' | \
+    sed -E 's/[[:space:]]+/:/g' | \
+    awk -F ':' '{filename = $1; sub(/^sys\//, "", filename);
+        printf("\t[%s] = \"%s\",\n", $4, filename)}') \
+    >>"${target}"