Simplify NativeIsComPort() implementation: native paths never end in ':', and never use forward slashes (any more), so no need to check for that.

Author: jan.nijtmans

win/tclWinChan.c

@@ -971,7 +971,7 @@ TclpOpenFileChannel(
     switch (FileGetType(handle)) {
     case FILE_TYPE_SERIAL:
 	/*
-	 * Natively named serial ports "com1-9", "\\\\.\\comXX" are 
+	 * Natively named serial ports "com1-9", "\\\\.\\comXX" are
 	 * already done with the code above.
 	 * Here we handle all other serial port names.
 	 *
@@ -1525,12 +1525,11 @@ FileGetType(
  * 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 
+ *	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[1-9]
  *	    \\.\COM[0-9]+
  *
  * Results:
@@ -1550,33 +1549,26 @@ NativeIsComPort(
      * 1. Look for com[1-9]:?
      */
 
-    if ( (len >= 4) && (len <= 5) 
-	    && (_wcsnicmp(p, L"com", 3) == 0) ) {
+    if ( (len == 4) && (_wcsnicmp(p, L"com", 3) == 0) ) {
 	/*
-	* The 4th character must be a digit 1..9 optionally followed by a ":"
+	* The 4th character must be a digit 1..9
 	*/
-	
+
 	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]+
+     * 2. Look for \\.\com[0-9]+
      */
-    
-    if ( (len >= 8) && ( 
-	       (_wcsnicmp(p, L"//./com", 7) == 0)
-	    || (_wcsnicmp(p, L"\\\\.\\com", 7) == 0) ) )
-    {
+
+    if ((len >= 8) && (_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;