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Disallow '/' in file names.

	A bad rename call could send a path with a '/' to cwfs.
	This is invalid, and should be disallowed.

--- a/sys/src/cmd/cwfs/sub.c

+++ b/sys/src/cmd/cwfs/sub.c

@@ -540,8 +540,8 @@

 /*

  * what are legal characters in a name?

  * only disallow control characters.

- * a) utf avoids control characters.

- * b) '/' may not be the separator

+ * utf avoids control characters, so we

+ * only need to inspect the ascii range.

  */

 int

 checkname(char *n)

@@ -556,7 +556,7 @@

 		c = n[i] & 0xff;

 		if(c == 0)

 			return 0;

-		if(c < 040)

+		if(c < 040 || c == '/')

 			return Ename;

 	}

 	return Etoolong;

-- 

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