51214: handle read -d and a delimiter that can't be decoded into a character

Terminate input at the raw byte value of the delimiter.
Also document and test the use of an empty string as a way to specify
NUL as the delimiter.

2 files changed, 18 insertions, 0 deletions

diff --git a/Test/B04read.ztst b/Test/B04read.ztst
index 96adf51c7..14bdaeef5 100644
--- a/Test/B04read.ztst
+++ b/Test/B04read.ztst
@@ -82,6 +82,10 @@
 >Testing the
 >null hypothesis
 
+ read -ed '' <<<$'one\0two'
+0:empty delimiter terminates at nulls
+>one
+
  print -n $'first line\x80second line\x80' |
  while read -d $'\x80' line; do print $line; done
 0:read with a delimiter >= 0x80
diff --git a/Test/D07multibyte.ztst b/Test/D07multibyte.ztst
index 6909346cb..413c4fe73 100644
--- a/Test/D07multibyte.ztst
+++ b/Test/D07multibyte.ztst
@@ -212,6 +212,20 @@
 >first
 >second
 
+  read -ed £
+0:read with multibyte delimiter where bytes of delimiter also occur in input
+<one¤twoãthree£four
+>one¤twoãthree
+
+  read -ed $'\xa0' <<<$'first\xa0second'
+0:read delimited by a byte that isn't a valid multibyte character
+>first
+
+  read -ed $'\xc2'
+0:read delimited by a single byte terminates if the byte is part of a multibyte character
+<one£two
+>one
+
   (IFS=«
   read -d » -A array
   print -l $array)