Reading 4K at a time from a serial port turns out to be a bit

[u/mdw/putty] / windows / winhandl.c

diff --git a/windows/winhandl.c b/windows/winhandl.c
index 7a3cce3..222e5b9 100644 (file)
--- a/windows/winhandl.c
+++ b/windows/winhandl.c
@@ -102,6 +102,7 @@ static DWORD WINAPI handle_input_threadfunc(void *param)
     struct handle_input *ctx = (struct handle_input *) param;
     OVERLAPPED ovl, *povl;
     HANDLE oev;
+    int readlen;
 
     if (ctx->flags & HANDLE_FLAG_OVERLAPPED) {
        povl = &ovl;
@@ -110,12 +111,17 @@ static DWORD WINAPI handle_input_threadfunc(void *param)
        povl = NULL;
     }
 
+    if (ctx->flags & HANDLE_FLAG_UNITBUFFER)
+       readlen = 1;
+    else
+       readlen = sizeof(ctx->buffer);
+
     while (1) {
        if (povl) {
            memset(povl, 0, sizeof(OVERLAPPED));
            povl->hEvent = oev;
        }
-       ctx->readret = ReadFile(ctx->h, ctx->buffer, sizeof(ctx->buffer),
+       ctx->readret = ReadFile(ctx->h, ctx->buffer, readlen,
                                &ctx->len, povl);
        if (povl && !ctx->readret && GetLastError() == ERROR_IO_PENDING) {
            WaitForSingleObject(povl->hEvent, INFINITE);