[Patch] Inplace editing on Cygwin and others?

From: "Gerrit P. Haase" <gp@familiehaase.de>
Message-ID: <199100765833.20020601041443@familiehaase.de>

p4raw-id: //depot/perl@16946

README.cygwin

@@ -401,8 +401,9 @@ Win9x can not rename() an open file (although WinNT can).
 The Cygwin chroot() implementation has holes (it can not restrict file
 access by native Win32 programs).
 
-Inplace editing ( perl -i ) of files doesn't work without doing a backup 
-of the file being edited ( perl -i.bak ).
+Inplace editing C<perl -i> of files doesn't work without doing a backup 
+of the file being edited C<perl -i.bak> because of windowish restrictions,
+so Perl does this automagically if you just use C<perl -i>.
 
 =back
 

doio.c

@@ -790,7 +790,7 @@ Perl_nextargv(pTHX_ register GV *gv)
 #endif
 		}
 		else {
-#if !defined(DOSISH) && !defined(AMIGAOS) && !defined(__CYGWIN__)
+#if !defined(DOSISH) && !defined(AMIGAOS)
 #  ifndef VMS  /* Don't delete; use automatic file versioning */
 		    if (UNLINK(PL_oldname) < 0) {
 		        if (ckWARN_d(WARN_INPLACE))	

perl.c

@@ -2363,6 +2363,12 @@ Perl_moreswitches(pTHX_ char *s)
     case 'i':
 	if (PL_inplace)
 	    Safefree(PL_inplace);
+#if defined(__CYGWIN__) /* do backup extension automagically */
+	if (*(s+1) == '\0') {
+	PL_inplace = savepv(".bak");
+	return s+1;
+	}
+#endif /* __CYGWIN__ */
 	PL_inplace = savepv(s+1);
 	/*SUPPRESS 530*/
 	for (s = PL_inplace; *s && !isSPACE(*s); s++) ;