programs: Document the reason for the WriteConsole() fall back.

programs/hostname/hostname.c

@@ -53,6 +53,10 @@ static int hostname_vprintfW(const WCHAR *msg, va_list va_args)
         DWORD len;
         char *msgA;
 
+        /* On Windows WriteConsoleW() fails if the output is redirected. So fall
+         * back to WriteFile(), assuming the console encoding is still the right
+         * one in that case.
+         */
         len = WideCharToMultiByte(GetConsoleOutputCP(), 0, msg_buffer, wlen,
             NULL, 0, NULL, NULL);
         msgA = HeapAlloc(GetProcessHeap(), 0, len);

programs/ipconfig/ipconfig.c

@@ -40,6 +40,10 @@ static int ipconfig_vprintfW(const WCHAR *msg, va_list va_args)
         DWORD len;
         char *msgA;
 
+        /* On Windows WriteConsoleW() fails if the output is redirected. So fall
+         * back to WriteFile(), assuming the console encoding is still the right
+         * one in that case.
+         */
         len = WideCharToMultiByte(GetConsoleOutputCP(), 0, msg_buffer, wlen,
             NULL, 0, NULL, NULL);
         msgA = HeapAlloc(GetProcessHeap(), 0, len);

programs/reg/reg.c

@@ -38,6 +38,10 @@ static int reg_printfW(const WCHAR *msg, ...)
         DWORD len;
         char  *msgA;
 
+        /* On Windows WriteConsoleW() fails if the output is redirected. So fall
+         * back to WriteFile(), assuming the console encoding is still the right
+         * one in that case.
+         */
         len = WideCharToMultiByte(GetConsoleOutputCP(), 0, msg_buffer, wlen,
             NULL, 0, NULL, NULL);
         msgA = HeapAlloc(GetProcessHeap(), 0, len * sizeof(char));

programs/taskkill/taskkill.c

@@ -50,6 +50,10 @@ static int taskkill_vprintfW(const WCHAR *msg, va_list va_args)
         DWORD len;
         char *msgA;
 
+        /* On Windows WriteConsoleW() fails if the output is redirected. So fall
+         * back to WriteFile(), assuming the console encoding is still the right
+         * one in that case.
+         */
         len = WideCharToMultiByte(GetConsoleOutputCP(), 0, msg_buffer, wlen,
             NULL, 0, NULL, NULL);
         msgA = HeapAlloc(GetProcessHeap(), 0, len);