Robustifying R_CleanTempDir a bit more

Thanks for the quick reply!

On Thu, 16 Feb 2023 15:43:40 +0100

Please see 83851 from earlier today which does a bit more of 
robustification, and if you find any problem in it, please let me
know.

83851 is an improvement, but it does let single quotes through,
unfortunately, leading to my (contrived) example of "/tmp/';echo;'". 

Given what you say about the temporary nature of the current fix,
adding the single quote to the list of special symbols should be a good
solution for now:

--- src/main/platform.c	(revision 83851)
+++ src/main/platform.c	(working copy)
@@ -1634,7 +1634,7 @@
 	/* On Solaris the working directory must be outside this one */
 	chdir(R_HomeDir());
 #endif
-	char *special = "\\`$\"\n";
+	char *special = "\\`$\"\n'";
 	int hasspecial = 0;
 	for(int i = 0; special[i] != '\0'; i++)
 	    if (strchr(Sys_TempDir, special[i])) {

At least I don't see a way out once you disallow single quotes in the
single-quoted string.

Best regards,
Ivan