From 31145f178e965c316eb97dcb24fe34779c6bd50e Mon Sep 17 00:00:00 2001
From: oehhar <harald.oehlmann@elmicron.de>
Date: Mon, 26 Oct 2020 10:53:29 +0000
Subject: Copied man page and test from Androwish
 https://www.androwish.org/home/ci/bc8b7e8094b66169

---
 doc/binary.n      |  9 +++++++++
 tests/binary.test | 11 ++++++++++-
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/doc/binary.n b/doc/binary.n
index 0e8b28e..3ba823b 100644
--- a/doc/binary.n
+++ b/doc/binary.n
@@ -762,6 +762,15 @@ high-to-low order within each byte.  For example,
 will return \fB2\fR with \fB01110\fR stored in \fIvar1\fR and
 \fB1000011100000101\fR stored in \fIvar2\fR.
 .RE
+.IP \fBC\fR 5
+This form is similar to \fBA\fR, except that it scans the data from start
+and terminates at the first null (C string semantics). For example,
+.RS
+.CS
+\fBbinary scan\fR "abc\e000efghi" A* var1
+.CE
+will return \fB1\fR with \fBabc\fR stored in \fIvar1\fR.
+.RE 
 .IP \fBH\fR 5
 The data is turned into a string of \fIcount\fR hexadecimal digits in
 high-to-low order represented as a sequence of characters in the set
diff --git a/tests/binary.test b/tests/binary.test
index cf3195f..501ec0d 100644
--- a/tests/binary.test
+++ b/tests/binary.test
@@ -759,7 +759,16 @@ test binary-21.12 {Tcl_BinaryObjCmd: scan} -setup {
 } -body {
     list [binary scan "abc def \x00ghi  " A* arg1] $arg1
 } -result [list 1 "abc def \x00ghi"]
-
+test binary-21.13 {Tcl_BinaryObjCmd: scan} -setup {
+    unset -nocomplain arg1
+} -body {
+    list [binary scan "abc def \x00  " C* arg1] $arg1
+} -result {1 {abc def }}
+test binary-21.12 {Tcl_BinaryObjCmd: scan} -setup {
+    unset -nocomplain arg1
+} -body {
+    list [binary scan "abc def \x00ghi" C* arg1] $arg1
+} -result {1 {abc def }} 
 test binary-22.1 {Tcl_BinaryObjCmd: scan} -returnCodes error -body {
     binary scan abc b
 } -result {not enough arguments for all format specifiers}
-- 
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