SERVER-1498: qualify custom strnlen in bsoninlines, move impl

 - strnlen was ambiguous in bsoninlines.h without goodies.h header
 - goodies.h header includes lots of other stuff, so moved custom
   strnlen to bson/util/misc.h.
 - update bsoninlines.h to use namespace qualified name

1 files changed, 9 insertions, 1 deletions

diff --git a/bson/util/misc.h b/bson/util/misc.h
index de5902528c4..cad9a284458 100644
--- a/bson/util/misc.h
+++ b/bson/util/misc.h
@@ -82,5 +82,13 @@ namespace mongo {
             return buf;
         }
     };
-   
+
+    // Like strlen, but only scans up to n bytes.
+    // Returns -1 if no '0' found.
+    inline int strnlen( const char *s, int n ) {
+        for( int i = 0; i < n; ++i )
+            if ( !s[ i ] )
+                return i;
+        return -1;
+    }
 }