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-rw-r--r--lib/pure/streams.nim4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/pure/streams.nim b/lib/pure/streams.nim
index eea06f4ce..438b48beb 100644
--- a/lib/pure/streams.nim
+++ b/lib/pure/streams.nim
@@ -334,12 +334,16 @@ when not defined(js):
     if result > 0:
       copyMem(buffer, addr(s.data[s.pos]), result)
       inc(s.pos, result)
+    else:
+      result = 0
 
   proc ssPeekData(s: Stream, buffer: pointer, bufLen: int): int =
     var s = StringStream(s)
     result = min(bufLen, s.data.len - s.pos)
     if result > 0:
       copyMem(buffer, addr(s.data[s.pos]), result)
+    else:
+      result = 0
 
   proc ssWriteData(s: Stream, buffer: pointer, bufLen: int) =
     var s = StringStream(s)