tacme: fix mtpt crash (Tim Wiess) - plan9port - [fork] Plan 9 from user space
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       ---
 (DIR) commit 5d32c407ba9b6563dd3fc1f594e268a102691c26
 (DIR) parent a2660887c0d607989b8a50822d8882140072a6a5
 (HTM) Author: Russ Cox <rsc@swtch.com>
       Date:   Thu,  8 May 2008 16:20:19 -0400
       
       acme: fix mtpt crash (Tim Wiess)
       
       Diffstat:
         M src/cmd/acme/acme.c                 |       3 +++
       
       1 file changed, 3 insertions(+), 0 deletions(-)
       ---
 (DIR) diff --git a/src/cmd/acme/acme.c b/src/cmd/acme/acme.c
       t@@ -1068,6 +1068,9 @@ ismtpt(char *file)
        {
                int n;
        
       +        if(mtpt == nil)
       +                return 0;
       +
                /* This is not foolproof, but it will stop a lot of them. */
                n = strlen(mtpt);
                return strncmp(file, mtpt, n) == 0 && ((n > 0 && mtpt[n-1] == '/') || file[n] == '/' || file[n] == 0);