diff options
| -rw-r--r-- | lib/pure/asyncfile.nim | 15 | ||||
| -rw-r--r-- | tests/async/t15148.nim | 12 |
2 files changed, 23 insertions, 4 deletions
diff --git a/lib/pure/asyncfile.nim b/lib/pure/asyncfile.nim index ad111ec50..71b42c763 100644 --- a/lib/pure/asyncfile.nim +++ b/lib/pure/asyncfile.nim @@ -379,7 +379,7 @@ proc writeBuffer*(f: AsyncFile, buf: pointer, size: int): Future[void] = proc cb(fd: AsyncFD): bool = result = true - let remainderSize = size-written + let remainderSize = size - written var cbuf = cast[cstring](buf) let res = write(fd.cint, addr cbuf[written], remainderSize.cint) if res < 0: @@ -409,7 +409,7 @@ proc write*(f: AsyncFile, data: string): Future[void] = var copy = data when defined(windows) or defined(nimdoc): var buffer = alloc0(data.len) - copyMem(buffer, addr copy[0], data.len) + copyMem(buffer, copy.cstring, data.len) var ol = newCustom() ol.data = CompletionData(fd: f.fd, cb: @@ -454,8 +454,15 @@ proc write*(f: AsyncFile, data: string): Future[void] = proc cb(fd: AsyncFD): bool = result = true - let remainderSize = data.len-written - let res = write(fd.cint, addr copy[written], remainderSize.cint) + + let remainderSize = data.len - written + + let res = + if data.len == 0: + write(fd.cint, copy.cstring, 0) + else: + write(fd.cint, addr copy[written], remainderSize.cint) + if res < 0: let lastError = osLastError() if lastError.int32 != EAGAIN: diff --git a/tests/async/t15148.nim b/tests/async/t15148.nim new file mode 100644 index 000000000..ba14c1157 --- /dev/null +++ b/tests/async/t15148.nim @@ -0,0 +1,12 @@ +import asyncdispatch, asyncfile, os + +const Filename = "t15148.txt" + +proc saveEmpty() {.async.} = + let + text = "" + file = openAsync(Filename, fmWrite) + await file.write(text) + file.close() + +waitFor saveEmpty() |