sh: Fix some parameter expansion variants ${#...}.

These already worked: $# ${#} ${##} ${#-} ${#?}
These now work as well: ${#+word} ${#-word} ${##word} ${#%word}

There is an ambiguity in the standard with ${#?}: it could be the length of
$? or it could be $# giving an error in the (impossible) case that it is not
set. We continue to use the former interpretation as it seems more useful.

2 files changed, 21 insertions, 0 deletions

diff --git a/tools/regression/bin/sh/expansion/plus-minus8.0 b/tools/regression/bin/sh/expansion/plus-minus8.0
new file mode 100644
index 0000000..beba009
--- /dev/null
+++ b/tools/regression/bin/sh/expansion/plus-minus8.0
@@ -0,0 +1,5 @@
+# $FreeBSD$
+
+set -- 1 2 3 4 5 6 7 8 9 10 11 12 13
+[ "${#+hi}" = hi ] || echo '${#+hi} wrong'
+[ "${#-hi}" = 13 ] || echo '${#-hi} wrong'
diff --git a/tools/regression/bin/sh/expansion/trim7.0 b/tools/regression/bin/sh/expansion/trim7.0
new file mode 100644
index 0000000..352bdea
--- /dev/null
+++ b/tools/regression/bin/sh/expansion/trim7.0
@@ -0,0 +1,16 @@
+# $FreeBSD$
+
+set -- 1 2 3 4 5 6 7 8 9 10 11 12 13
+[ "${##1}" = 3 ] || echo '${##1} wrong'
+[ "${###1}" = 3 ] || echo '${###1} wrong'
+[ "${###}" = 13 ] || echo '${###} wrong'
+[ "${#%3}" = 1 ] || echo '${#%3} wrong'
+[ "${#%%3}" = 1 ] || echo '${#%%3} wrong'
+[ "${#%%}" = 13 ] || echo '${#%%} wrong'
+set --
+[ "${##0}" = "" ] || echo '${##0} wrong'
+[ "${###0}" = "" ] || echo '${###0} wrong'
+[ "${###}" = 0 ] || echo '${###} wrong'
+[ "${#%0}" = "" ] || echo '${#%0} wrong'
+[ "${#%%0}" = "" ] || echo '${#%%0} wrong'
+[ "${#%%}" = 0 ] || echo '${#%%} wrong'