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-rw-r--r--generic/tclIO.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/generic/tclIO.c b/generic/tclIO.c
index c6bb5e3..0c13bc0 100644
--- a/generic/tclIO.c
+++ b/generic/tclIO.c
@@ -5797,7 +5797,7 @@ ReadChars(
* for sizing receiving buffers.
*/
- int toRead = ((unsigned) charsToRead > srcLen) ? srcLen : charsToRead;
+ int toRead = ((charsToRead<0)||(charsToRead > srcLen)) ? srcLen : charsToRead;
/*
* 'factor' is how much we guess that the bytes in the source buffer will