X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=blobdiff_plain;f=wildcard.c;h=c1cb0b49e657169493aacb48a0d1454426a987e8;hb=7705fc4470b76ec7979dc00e5c97efd720d5e335;hp=a09f2c1dbff7b1c978b0efd3a70268902c54f83a;hpb=2f1e76e843e56d7adf5c71c110508e8cd26b02c0;p=PuTTY.git

diff --git a/wildcard.c b/wildcard.c
index a09f2c1d..c1cb0b49 100644
--- a/wildcard.c
+++ b/wildcard.c
@@ -29,6 +29,17 @@
  *  - All other characters are non-special and match themselves.
  */
 
+/*
+ * Some notes on differences from POSIX globs (IEEE Std 1003.1, 2003 ed.):
+ *  - backslashes act as escapes even within [] bracket expressions
+ *  - does not support [!...] for non-matching list (POSIX are weird);
+ *    NB POSIX allows [^...] as well via "A bracket expression starting
+ *    with an unquoted circumflex character produces unspecified
+ *    results". If we wanted to allow [!...] we might want to define
+ *    [^!] as having its literal meaning (match '^' or '!').
+ *  - none of the scary [[:class:]] stuff, etc
+ */
+
 /*
  * The wildcard matching technique we use is very simple and
  * potentially O(N^2) in running time, but I don't anticipate it
@@ -315,7 +326,8 @@ int wc_unescape(char *output, const char *wildcard)
 	    wildcard++;
 	}
     }
-    *output = '\0';
+    if (output)
+        *output = '\0';
     return 1;			       /* it's clean */
 }