From fa4296d730d75f2e7c89a4466dda3f50562b915d Mon Sep 17 00:00:00 2001
From: cnc <cnc@localhost>
Date: Wed, 3 Jun 2026 09:12:17 +0800
Subject: [PATCH] =?UTF-8?q?=E5=8F=82=E8=80=83=E6=89=80=E6=9C=89=E5=88=86?=
 =?UTF-8?q?=E7=BB=84=EF=BC=9A=E8=A1=A5=20percent=20=E9=94=99=E8=AF=AF=20so?=
 =?UTF-8?q?urce=20=E8=A6=86=E7=9B=96=EF=BC=8C=E6=B5=8B=E8=AF=95=E9=80=9A?=
 =?UTF-8?q?=E8=BF=87?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 test-all-native.sh                                 | 2 ++
 test-linuxcnc-source-link.sh                       | 6 +++++-
 tests/gcode/linuxcnc_commented_percent_error.ngc   | 3 +++
 tests/gcode/linuxcnc_mid_program_percent_error.ngc | 3 +++
 4 files changed, 13 insertions(+), 1 deletion(-)
 create mode 100644 tests/gcode/linuxcnc_commented_percent_error.ngc
 create mode 100644 tests/gcode/linuxcnc_mid_program_percent_error.ngc

diff --git a/test-all-native.sh b/test-all-native.sh
index dfb9eec..6206704 100755
--- a/test-all-native.sh
+++ b/test-all-native.sh
@@ -567,6 +567,8 @@ grep -F 'tests/gcode/linuxcnc_close_and_downcase_words.ngc' test-linuxcnc-source
 grep -F 'tests/gcode/linuxcnc_percent_file_ignores_trailing.ngc' test-linuxcnc-source-link.sh >/dev/null
 grep -F 'linuxcnc_unclosed_comment_error|Unclosed comment found' test-linuxcnc-source-link.sh >/dev/null
 grep -F 'linuxcnc_nested_comment_error|Nested comment found' test-linuxcnc-source-link.sh >/dev/null
+grep -F 'linuxcnc_commented_percent_error|Bad character '\''%'\'' used' test-linuxcnc-source-link.sh >/dev/null
+grep -F 'linuxcnc_mid_program_percent_error|Bad character '\''%'\'' used' test-linuxcnc-source-link.sh >/dev/null
 
 for script in \
     test-native.sh \
diff --git a/test-linuxcnc-source-link.sh b/test-linuxcnc-source-link.sh
index 241d439..4543e68 100755
--- a/test-linuxcnc-source-link.sh
+++ b/test-linuxcnc-source-link.sh
@@ -1022,9 +1022,13 @@ done
 # read_one_item() then uses the default reader table from interp_array.cc
 # and rejects unknown item-start characters, including middle-of-line or
 # comment-prefixed N/O words, midline O-words, bracket expressions, naked numbers, and
-# non-leading ATAN argument slashes.
+# non-leading ATAN argument slashes. LinuxCNC src/emc/rs274ngc/rs274ngc_pre.cc
+# open() only enables percent-file mode when the first nonblank line contains
+# only '%', so commented or non-opening percent lines reach read_one_item().
 bad_character_error_cases=(
     "linuxcnc_bad_character_bang_error|Bad character '!' used"
+    "linuxcnc_commented_percent_error|Bad character '%' used"
+    "linuxcnc_mid_program_percent_error|Bad character '%' used"
     "linuxcnc_bad_character_middle_n_word_error|Bad character 'n' used"
     "linuxcnc_comment_prefixed_n_word_error|Bad character 'n' used"
     "linuxcnc_comment_prefixed_spaced_n_word_error|Bad character 'n' used"
diff --git a/tests/gcode/linuxcnc_commented_percent_error.ngc b/tests/gcode/linuxcnc_commented_percent_error.ngc
new file mode 100644
index 0000000..2a838e6
--- /dev/null
+++ b/tests/gcode/linuxcnc_commented_percent_error.ngc
@@ -0,0 +1,3 @@
+% (not a delimiter)
+G0 X1
+%
diff --git a/tests/gcode/linuxcnc_mid_program_percent_error.ngc b/tests/gcode/linuxcnc_mid_program_percent_error.ngc
new file mode 100644
index 0000000..19388c8
--- /dev/null
+++ b/tests/gcode/linuxcnc_mid_program_percent_error.ngc
@@ -0,0 +1,3 @@
+G0 X1
+%
+G0 Y2