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-rw-r--r--win/tclWinChan.c107
1 files changed, 105 insertions, 2 deletions
diff --git a/win/tclWinChan.c b/win/tclWinChan.c
index 21115f7..48acacb 100644
--- a/win/tclWinChan.c
+++ b/win/tclWinChan.c
@@ -95,7 +95,7 @@ static void FileThreadActionProc(ClientData instanceData,
static int FileTruncateProc(ClientData instanceData,
Tcl_WideInt length);
static DWORD FileGetType(HANDLE handle);
-
+static int NativeIsComPort(CONST TCHAR *nativeName);
/*
* This structure describes the channel type structure for file based IO.
*/
@@ -662,6 +662,10 @@ FileInputProc(
*errorCode = 0;
/*
+ * TODO: This comment appears to be out of date. We *do* have a
+ * console driver, over in tclWinConsole.c. After some Windows
+ * developer confirms, this comment should be revised.
+ *
* Note that we will block on reads from a console buffer until a full
* line has been entered. The only way I know of to get around this is to
* write a console driver. We should probably do this at some point, but
@@ -885,6 +889,33 @@ TclpOpenFileChannel(
}
/*
+ * [2413550] Avoid double-open of serial ports on Windows
+ * Special handling for Windows serial ports by a "name-hint"
+ * to directly open it with the OVERLAPPED flag set.
+ */
+
+ if( NativeIsComPort(nativeName) ) {
+
+ handle = TclWinSerialOpen(INVALID_HANDLE_VALUE, nativeName, accessMode);
+ if (handle == INVALID_HANDLE_VALUE) {
+ TclWinConvertError(GetLastError());
+ if (interp != (Tcl_Interp *) NULL) {
+ Tcl_AppendResult(interp, "couldn't open serial \"",
+ TclGetString(pathPtr), "\": ",
+ Tcl_PosixError(interp), NULL);
+ }
+ return NULL;
+ }
+
+ /*
+ * For natively named Windows serial ports we are done.
+ */
+ channel = TclWinOpenSerialChannel(handle, channelName,
+ channelPermissions);
+
+ return channel;
+ }
+ /*
* If the file is being created, get the file attributes from the
* permissions argument, else use the existing file attributes.
*/
@@ -935,11 +966,15 @@ TclpOpenFileChannel(
switch (FileGetType(handle)) {
case FILE_TYPE_SERIAL:
/*
+ * Natively named serial ports "com1-9", "\\\\.\\comXX" are
+ * already done with the code above.
+ * Here we handle all other serial port names.
+ *
* Reopen channel for OVERLAPPED operation. Normally this shouldn't
* fail, because the channel exists.
*/
- handle = TclWinSerialReopen(handle, nativeName, accessMode);
+ handle = TclWinSerialOpen(handle, nativeName, accessMode);
if (handle == INVALID_HANDLE_VALUE) {
TclWinConvertError(GetLastError());
if (interp != (Tcl_Interp *) NULL) {
@@ -1479,6 +1514,74 @@ FileGetType(
return type;
}
+ /*
+ *----------------------------------------------------------------------
+ *
+ * NativeIsComPort --
+ *
+ * Determines if a path refers to a Windows serial port.
+ * A simple and efficient solution is to use a "name hint" to detect
+ * COM ports by their filename instead of resorting to a syscall
+ * to detect serialness after the fact.
+ * The following patterns cover common serial port names:
+ * COM[1-9]:?
+ * //./COM[0-9]+
+ * \\.\COM[0-9]+
+ *
+ * Results:
+ * 1 = serial port, 0 = not.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+NativeIsComPort(
+ const TCHAR *nativePath) /* Path of file to access, native encoding. */
+{
+ const WCHAR *p = (const WCHAR *) nativePath;
+ int i, len = wcslen(p);
+
+ /*
+ * 1. Look for com[1-9]:?
+ */
+
+ if ( (len >= 4) && (len <= 5)
+ && (_wcsnicmp(p, L"com", 3) == 0) ) {
+ /*
+ * The 4th character must be a digit 1..9 optionally followed by a ":"
+ */
+
+ if ( (p[3] < L'1') || (p[3] > L'9') ) {
+ return 0;
+ }
+ if ( (len == 5) && (p[4] != L':') ) {
+ return 0;
+ }
+ return 1;
+ }
+
+ /*
+ * 2. Look for //./com[0-9]+ or \\.\com[0-9]+
+ */
+
+ if ( (len >= 8) && (
+ (_wcsnicmp(p, L"//./com", 7) == 0)
+ || (_wcsnicmp(p, L"\\\\.\\com", 7) == 0) ) )
+ {
+ /*
+ * Charaters 8..end must be a digits 0..9
+ */
+
+ for ( i=7; i<len; i++ ) {
+ if ( (p[i] < '0') || (p[i] > '9') ) {
+ return 0;
+ }
+ }
+ return 1;
+ }
+ return 0;
+}
+
/*
* Local Variables:
* mode: c