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-rw-r--r--generic/tclIO.c5
-rw-r--r--tests/io.test33
2 files changed, 35 insertions, 3 deletions
diff --git a/generic/tclIO.c b/generic/tclIO.c
index dcde8d1..aea633c 100644
--- a/generic/tclIO.c
+++ b/generic/tclIO.c
@@ -6046,12 +6046,11 @@ ReadChars(
/*
* We read more chars than allowed. Reset limits to
* prevent that and try again. Don't forget the extra
- * padding of TCL_UTF_MAX - 1 bytes demanded by the
+ * padding of TCL_UTF_MAX bytes demanded by the
* Tcl_ExternalToUtf() call!
*/
- dstLimit = Tcl_UtfAtIndex(dst, charsToRead + 1)
- + TCL_UTF_MAX - 1 - dst;
+ dstLimit = Tcl_UtfAtIndex(dst, charsToRead) + TCL_UTF_MAX - dst;
statePtr->flags = savedFlags;
statePtr->inputEncodingFlags = savedIEFlags;
statePtr->inputEncodingState = savedState;
diff --git a/tests/io.test b/tests/io.test
index 639691a..a030200 100644
--- a/tests/io.test
+++ b/tests/io.test
@@ -1484,6 +1484,39 @@ test io-12.6 {ReadChars: too many chars read} {
}
close $c
} {}
+test io-12.7 {ReadChars: too many chars read [bc5b790099]} {
+ proc driver {cmd args} {
+ variable buffer
+ variable index
+ set chan [lindex $args 0]
+ switch -- $cmd {
+ initialize {
+ set index($chan) 0
+ set buffer($chan) [encoding convertto utf-8 \
+ [string repeat \uBEEF 10]....\uBEEF]
+ return {initialize finalize watch read}
+ }
+ finalize {
+ unset index($chan) buffer($chan)
+ return
+ }
+ watch {}
+ read {
+ set n [lindex $args 1]
+ set new [expr {$index($chan) + $n}]
+ set result [string range $buffer($chan) $index($chan) $new-1]
+ set index($chan) $new
+ return $result
+ }
+ }
+ }
+ set c [chan create read [namespace which driver]]
+ chan configure $c -encoding utf-8
+ while {![eof $c]} {
+ read $c 7
+ }
+ close $c
+} {}
test io-13.1 {TranslateInputEOL: cr mode} {} {
set f [open $path(test1) w]