diff options
| -rw-r--r-- | generic/tclIO.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/generic/tclIO.c b/generic/tclIO.c index 6e5dc05..e7eaefa 100644 --- a/generic/tclIO.c +++ b/generic/tclIO.c @@ -346,8 +346,8 @@ static Tcl_ObjType chanObjType = { * * ChanRead -- * - * Read up to bytes using the inputProc of chanPtr, store them at dst, - * and return the number of bytes stored. + * Read up to dstsize bytes using the inputProc of chanPtr, store + * them at dst, and return the number of bytes stored. * * Results: * The return value of the driver inputProc, @@ -373,6 +373,12 @@ ChanRead( { int bytesRead, result; + /* + * If the caller asked for zero bytes, we'd force the inputProc + * to return zero bytes, and then misinterpret that as EOF + */ + assert(dstSize > 0); + if (WillRead(chanPtr) < 0) { return -1; } |