diff options
| -rw-r--r-- | lib/pure/streams.nim | 5 | ||||
| -rw-r--r-- | tests/stdlib/tstreams.nim | 10 |
2 files changed, 15 insertions, 0 deletions
diff --git a/lib/pure/streams.nim b/lib/pure/streams.nim index f58273ee8..50b3085d2 100644 --- a/lib/pure/streams.nim +++ b/lib/pure/streams.nim @@ -1197,6 +1197,11 @@ else: # after 1.3 or JS not defined proc ssReadDataStr(s: Stream, buffer: var string, slice: Slice[int]): int = var s = StringStream(s) + when nimvm: + discard + else: + when declared(prepareMutation): + prepareMutation(buffer) # buffer might potentially be a CoW literal with ARC result = min(slice.b + 1 - slice.a, s.data.len - s.pos) if result > 0: jsOrVmBlock: diff --git a/tests/stdlib/tstreams.nim b/tests/stdlib/tstreams.nim index d9857926e..cc1343651 100644 --- a/tests/stdlib/tstreams.nim +++ b/tests/stdlib/tstreams.nim @@ -85,3 +85,13 @@ block: static: # Ensure streams it doesnt break with nimscript on arc/orc #19716 let s = newStringStream("a") doAssert s.data == "a" + +template main = + var strm = newStringStream("abcde") + var buffer = "12345" + doAssert strm.readDataStr(buffer, 0..3) == 4 + doAssert buffer == "abcd5" + strm.close() + +static: main() +main() |