#3626: On cygwin, starting "python z" would not display any error message:
printf("%ls") fails if the wide string is 1 char long :-(
diff --git a/Misc/NEWS b/Misc/NEWS
index b06e4b6..6d61192 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -15,10 +15,13 @@
Core and Builtins
-----------------
+- Issue #3626: On cygwin, starting python with a non-existent script name
+ would not display anything if the file name is only 1 character long.
+
- Issue #4176: Fixed a crash when pickling an object which ``__reduce__``
method does not return iterators for the 4th and 5th items.
-- Issue 3723: Fixed initialization of subinterpreters.
+- Issue #3723: Fixed initialization of subinterpreters.
- Issue #4213: The file system encoding is now normalized by the
codec subsystem, for example UTF-8 is turned into utf-8.
diff --git a/Modules/main.c b/Modules/main.c
index 5a84cc2..6fdc33a 100644
--- a/Modules/main.c
+++ b/Modules/main.c
@@ -564,8 +564,17 @@
if (sts==-1 && filename!=NULL) {
if ((fp = _wfopen(filename, L"r")) == NULL) {
- fprintf(stderr, "%ls: can't open file '%ls': [Errno %d] %s\n",
- argv[0], filename, errno, strerror(errno));
+ char cfilename[PATH_MAX];
+ size_t r = wcstombs(cfilename, filename, PATH_MAX);
+ if (r == PATH_MAX)
+ /* cfilename is not null-terminated;
+ * forcefully null-terminating it
+ * might break the shift state */
+ strcpy(cfilename, "<file name too long>");
+ if (r == ((size_t)-1))
+ strcpy(cfilename, "<unprintable file name>");
+ fprintf(stderr, "%ls: can't open file '%s': [Errno %d] %s\n",
+ argv[0], cfilename, errno, strerror(errno));
return 2;
}