From 2a472d54878ef0ee4d5785a7b5110b4e088cde9d Mon Sep 17 00:00:00 2001
From: Zeping Lee <zepinglee@gmail.com>
Date: Wed, 18 Apr 2018 17:47:48 +0800
Subject: [PATCH] fix doi check

---
 ustcauthoryear.bst | 4 ++--
 ustcbachelor.bst   | 4 ++--
 ustcnumerical.bst  | 4 ++--
 ustcthesis.dtx     | 4 ++--
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/ustcauthoryear.bst b/ustcauthoryear.bst
index a7423d3..ad3652f 100644
--- a/ustcauthoryear.bst
+++ b/ustcauthoryear.bst
@@ -463,7 +463,8 @@ FUNCTION {format.doi}
         { t empty$ not}
         { t #1 #1 substring$ 'tmp.str :=
           tmp.str "," = tmp.str " " = or
-            { s is.doi.in.url not
+            { s empty$ s is.doi.in.url or
+                'skip$
                 { numnames #1 + 'numnames :=
                   numnames #1 >
                     { ", " * }
@@ -471,7 +472,6 @@ FUNCTION {format.doi}
                   if$
                   "\doi{" s * "}" * *
                 }
-                'skip$
               if$
               "" 's :=
             }
diff --git a/ustcbachelor.bst b/ustcbachelor.bst
index 1ed280c..171c610 100644
--- a/ustcbachelor.bst
+++ b/ustcbachelor.bst
@@ -462,7 +462,8 @@ FUNCTION {format.doi}
         { t empty$ not}
         { t #1 #1 substring$ 'tmp.str :=
           tmp.str "," = tmp.str " " = or
-            { s is.doi.in.url not
+            { s empty$ s is.doi.in.url or
+                'skip$
                 { numnames #1 + 'numnames :=
                   numnames #1 >
                     { ", " * }
@@ -470,7 +471,6 @@ FUNCTION {format.doi}
                   if$
                   "\doi{" s * "}" * *
                 }
-                'skip$
               if$
               "" 's :=
             }
diff --git a/ustcnumerical.bst b/ustcnumerical.bst
index e06857c..652d6a0 100644
--- a/ustcnumerical.bst
+++ b/ustcnumerical.bst
@@ -463,7 +463,8 @@ FUNCTION {format.doi}
         { t empty$ not}
         { t #1 #1 substring$ 'tmp.str :=
           tmp.str "," = tmp.str " " = or
-            { s is.doi.in.url not
+            { s empty$ s is.doi.in.url or
+                'skip$
                 { numnames #1 + 'numnames :=
                   numnames #1 >
                     { ", " * }
@@ -471,7 +472,6 @@ FUNCTION {format.doi}
                   if$
                   "\doi{" s * "}" * *
                 }
-                'skip$
               if$
               "" 's :=
             }
diff --git a/ustcthesis.dtx b/ustcthesis.dtx
index a59667a..43d9ce9 100644
--- a/ustcthesis.dtx
+++ b/ustcthesis.dtx
@@ -2643,7 +2643,8 @@ FUNCTION {format.doi}
         { t empty$ not}
         { t #1 #1 substring$ 'tmp.str :=
           tmp.str "," = tmp.str " " = or
-            { s is.doi.in.url not
+            { s empty$ s is.doi.in.url or
+                'skip$
                 { numnames #1 + 'numnames :=
                   numnames #1 >
                     { ", " * }
@@ -2651,7 +2652,6 @@ FUNCTION {format.doi}
                   if$
                   "\doi{" s * "}" * *
                 }
-                'skip$
               if$
               "" 's :=
             }