diff options
Diffstat (limited to 'win/tclWinChan.c')
| -rw-r--r-- | win/tclWinChan.c | 151 |
1 files changed, 149 insertions, 2 deletions
diff --git a/win/tclWinChan.c b/win/tclWinChan.c index 89d898f..6d480a8 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. */ @@ -886,6 +886,33 @@ 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 +962,15 @@ 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) { @@ -1476,6 +1507,122 @@ 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. */ +{ + /* + * Use wide-char or plain character case-insensitive comparison + */ + if (tclWinProcs->useWide) { + 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; + } + + } else { + const char *p = (const char *) nativePath; + int i, len = strlen(p); + + /* + * 1. Look for com[1-9]:? + */ + + if ( (len >= 4) && (len <= 5) + && (strnicmp(p, "com", 3) == 0) ) { + /* + * The 4th character must be a digit 1..9 optionally followed by a ":" + */ + + if ( (p[3] < '1') || (p[3] > '9') ) { + return 0; + } + if ( (len == 5) && (p[4] != ':') ) { + return 0; + } + return 1; + } + + /* + * 2. Look for //./com[0-9]+ or \\.\com[0-9]+ + */ + + if ( (len >= 8) && ( + (strnicmp(p, "//./com", 7) == 0) + || (strnicmp(p, "\\\\.\\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 |