From fa82ef1a2ec558bb8e624461851a0d1fcbc0a0b6 Mon Sep 17 00:00:00 2001
From: Denys Vlasenko <vda.linux@googlemail.com>
Date: Sat, 9 Aug 2025 01:48:12 +0200
Subject: shells: add testsuite item

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
 shell/ash_test/ash-vars/var_backslash1.right   | 25 +++++++++++++++++
 shell/ash_test/ash-vars/var_backslash1.tests   | 37 ++++++++++++++++++++++++++
 shell/hush_test/hush-bugs/var_backslash1.right | 25 +++++++++++++++++
 shell/hush_test/hush-bugs/var_backslash1.tests | 37 ++++++++++++++++++++++++++
 4 files changed, 124 insertions(+)
 create mode 100644 shell/ash_test/ash-vars/var_backslash1.right
 create mode 100755 shell/ash_test/ash-vars/var_backslash1.tests
 create mode 100644 shell/hush_test/hush-bugs/var_backslash1.right
 create mode 100755 shell/hush_test/hush-bugs/var_backslash1.tests

(limited to 'shell')

diff --git a/shell/ash_test/ash-vars/var_backslash1.right b/shell/ash_test/ash-vars/var_backslash1.right
new file mode 100644
index 000000000..066294838
--- /dev/null
+++ b/shell/ash_test/ash-vars/var_backslash1.right
@@ -0,0 +1,25 @@
+a is '\*bc'
+b is '\'
+c is '*'
+${a##?*} removes everything:    ||
+${a##?"*"} removes \*:          |bc| - matches one char, then *
+${a##\*} removes nothing:       |\*bc| - first char is not *
+${a##\\*} removes everything:   || - matches \, then all
+${a##\\\*} removes \*:          || - matches \, then *
+${a##?$c} removes everything:   || - matches one char, then all
+${a##?"$c"} removes \*:         |bc| - matches one char, then *
+${a##\\$c} removes everything:  || - matches \, then all
+${a##\\"$c"} removes \*:        |bc| - matches \, then *
+${a##$b} removes \:             |*bc| - matches \
+${a##"$b"} removes \:           |*bc| - matches \
+
+${a##"$b"?} removes \*:         |bc| - matches \, then one char
+${a##"$b"*} removes everything: || - matches \, then all
+${a##"$b""?"} removes nothing:  |\*bc| - second char is not ?
+${a##"$b""*"} removes \*:       |bc| - matches \, then *
+${a##"$b"\*} removes \*:        |bc| - matches \, then *
+${a##"$b"$c} removes everything:|| - matches \, then all
+${a##"$b""$c"} removes \*:      |bc| - matches \, then *
+${a##"$b?"} removes nothing:    |\*bc| - second char is not ?
+${a##"$b*"} removes \*:         |bc| - matches \, then *
+${a##"$b$c"} removes \*:        |bc| - matches \, then *
diff --git a/shell/ash_test/ash-vars/var_backslash1.tests b/shell/ash_test/ash-vars/var_backslash1.tests
new file mode 100755
index 000000000..7d865c929
--- /dev/null
+++ b/shell/ash_test/ash-vars/var_backslash1.tests
@@ -0,0 +1,37 @@
+a='\*bc'
+b='\'
+c='*'
+echo "a is '$a'"
+echo "b is '$b'"
+echo "c is '$c'"
+echo '${a##?*} removes everything:    '"|${a##?*}|"
+echo '${a##?"*"} removes \*:          '"|${a##?"*"}|"' - matches one char, then *'
+echo '${a##\*} removes nothing:       '"|${a##\*}|"' - first char is not *'
+echo '${a##\\*} removes everything:   '"|${a##\\*}|"' - matches \, then all'
+echo '${a##\\\*} removes \*:          '"|${a##\\*}|"' - matches \, then *'
+echo '${a##?$c} removes everything:   '"|${a##?$c}|"' - matches one char, then all'
+echo '${a##?"$c"} removes \*:         '"|${a##?"$c"}|"' - matches one char, then *'
+echo '${a##\\$c} removes everything:  '"|${a##\\$c}|"' - matches \, then all'
+echo '${a##\\"$c"} removes \*:        '"|${a##\\"$c"}|"' - matches \, then *'
+echo '${a##$b} removes \:             '"|${a##$b}|"' - matches \'
+echo '${a##"$b"} removes \:           '"|${a##"$b"}|"' - matches \'
+echo
+## In bash, this isn't working as expected
+#echo '${a##$b?} removes \*:           '"|${a##$b?}|"' - matches \, then one char'   # bash prints |\*bc|
+#echo '${a##$b*} removes everything:   '"|${a##$b*}|"' - matches \, then all'        # bash prints |\*bc|
+#echo '${a##$b$c} removes everything:  '"|${a##$b$c}|"' - matches \, then all'       # bash prints |\*bc|
+#echo '${a##$b"$c"} removes \*:        '"|${a##$b"$c"}|"' - matches \, then *'       # bash prints |\*bc|
+## the cause seems to be that $b emits backslash that "glues" onto next character if there is one:
+## a='\*bc'; b='\'; c='*'; echo "|${a##?$b*}|"  # bash prints |bc| - the $b* works as \* (matches literal *)
+## a='\*bc'; b='\'; c='*'; echo "|${a##\\$b*}|" # bash prints |bc|
+#echo
+echo '${a##"$b"?} removes \*:         '"|${a##"$b"?}|"' - matches \, then one char'
+echo '${a##"$b"*} removes everything: '"|${a##"$b"*}|"' - matches \, then all'
+echo '${a##"$b""?"} removes nothing:  '"|${a##"$b""?"}|"' - second char is not ?'  # bash prints |bc|
+echo '${a##"$b""*"} removes \*:       '"|${a##"$b""*"}|"' - matches \, then *'
+echo '${a##"$b"\*} removes \*:        '"|${a##"$b"\*}|"' - matches \, then *'
+echo '${a##"$b"$c} removes everything:'"|${a##"$b"$c}|"' - matches \, then all'
+echo '${a##"$b""$c"} removes \*:      '"|${a##"$b""$c"}|"' - matches \, then *'
+echo '${a##"$b?"} removes nothing:    '"|${a##"$b?"}|"' - second char is not ?'  # bash prints |bc|
+echo '${a##"$b*"} removes \*:         '"|${a##"$b*"}|"' - matches \, then *'     # bash prints ||
+echo '${a##"$b$c"} removes \*:        '"|${a##"$b$c"}|"' - matches \, then *'
diff --git a/shell/hush_test/hush-bugs/var_backslash1.right b/shell/hush_test/hush-bugs/var_backslash1.right
new file mode 100644
index 000000000..066294838
--- /dev/null
+++ b/shell/hush_test/hush-bugs/var_backslash1.right
@@ -0,0 +1,25 @@
+a is '\*bc'
+b is '\'
+c is '*'
+${a##?*} removes everything:    ||
+${a##?"*"} removes \*:          |bc| - matches one char, then *
+${a##\*} removes nothing:       |\*bc| - first char is not *
+${a##\\*} removes everything:   || - matches \, then all
+${a##\\\*} removes \*:          || - matches \, then *
+${a##?$c} removes everything:   || - matches one char, then all
+${a##?"$c"} removes \*:         |bc| - matches one char, then *
+${a##\\$c} removes everything:  || - matches \, then all
+${a##\\"$c"} removes \*:        |bc| - matches \, then *
+${a##$b} removes \:             |*bc| - matches \
+${a##"$b"} removes \:           |*bc| - matches \
+
+${a##"$b"?} removes \*:         |bc| - matches \, then one char
+${a##"$b"*} removes everything: || - matches \, then all
+${a##"$b""?"} removes nothing:  |\*bc| - second char is not ?
+${a##"$b""*"} removes \*:       |bc| - matches \, then *
+${a##"$b"\*} removes \*:        |bc| - matches \, then *
+${a##"$b"$c} removes everything:|| - matches \, then all
+${a##"$b""$c"} removes \*:      |bc| - matches \, then *
+${a##"$b?"} removes nothing:    |\*bc| - second char is not ?
+${a##"$b*"} removes \*:         |bc| - matches \, then *
+${a##"$b$c"} removes \*:        |bc| - matches \, then *
diff --git a/shell/hush_test/hush-bugs/var_backslash1.tests b/shell/hush_test/hush-bugs/var_backslash1.tests
new file mode 100755
index 000000000..7d865c929
--- /dev/null
+++ b/shell/hush_test/hush-bugs/var_backslash1.tests
@@ -0,0 +1,37 @@
+a='\*bc'
+b='\'
+c='*'
+echo "a is '$a'"
+echo "b is '$b'"
+echo "c is '$c'"
+echo '${a##?*} removes everything:    '"|${a##?*}|"
+echo '${a##?"*"} removes \*:          '"|${a##?"*"}|"' - matches one char, then *'
+echo '${a##\*} removes nothing:       '"|${a##\*}|"' - first char is not *'
+echo '${a##\\*} removes everything:   '"|${a##\\*}|"' - matches \, then all'
+echo '${a##\\\*} removes \*:          '"|${a##\\*}|"' - matches \, then *'
+echo '${a##?$c} removes everything:   '"|${a##?$c}|"' - matches one char, then all'
+echo '${a##?"$c"} removes \*:         '"|${a##?"$c"}|"' - matches one char, then *'
+echo '${a##\\$c} removes everything:  '"|${a##\\$c}|"' - matches \, then all'
+echo '${a##\\"$c"} removes \*:        '"|${a##\\"$c"}|"' - matches \, then *'
+echo '${a##$b} removes \:             '"|${a##$b}|"' - matches \'
+echo '${a##"$b"} removes \:           '"|${a##"$b"}|"' - matches \'
+echo
+## In bash, this isn't working as expected
+#echo '${a##$b?} removes \*:           '"|${a##$b?}|"' - matches \, then one char'   # bash prints |\*bc|
+#echo '${a##$b*} removes everything:   '"|${a##$b*}|"' - matches \, then all'        # bash prints |\*bc|
+#echo '${a##$b$c} removes everything:  '"|${a##$b$c}|"' - matches \, then all'       # bash prints |\*bc|
+#echo '${a##$b"$c"} removes \*:        '"|${a##$b"$c"}|"' - matches \, then *'       # bash prints |\*bc|
+## the cause seems to be that $b emits backslash that "glues" onto next character if there is one:
+## a='\*bc'; b='\'; c='*'; echo "|${a##?$b*}|"  # bash prints |bc| - the $b* works as \* (matches literal *)
+## a='\*bc'; b='\'; c='*'; echo "|${a##\\$b*}|" # bash prints |bc|
+#echo
+echo '${a##"$b"?} removes \*:         '"|${a##"$b"?}|"' - matches \, then one char'
+echo '${a##"$b"*} removes everything: '"|${a##"$b"*}|"' - matches \, then all'
+echo '${a##"$b""?"} removes nothing:  '"|${a##"$b""?"}|"' - second char is not ?'  # bash prints |bc|
+echo '${a##"$b""*"} removes \*:       '"|${a##"$b""*"}|"' - matches \, then *'
+echo '${a##"$b"\*} removes \*:        '"|${a##"$b"\*}|"' - matches \, then *'
+echo '${a##"$b"$c} removes everything:'"|${a##"$b"$c}|"' - matches \, then all'
+echo '${a##"$b""$c"} removes \*:      '"|${a##"$b""$c"}|"' - matches \, then *'
+echo '${a##"$b?"} removes nothing:    '"|${a##"$b?"}|"' - second char is not ?'  # bash prints |bc|
+echo '${a##"$b*"} removes \*:         '"|${a##"$b*"}|"' - matches \, then *'     # bash prints ||
+echo '${a##"$b$c"} removes \*:        '"|${a##"$b$c"}|"' - matches \, then *'
-- 
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