From 291331c74557786cf5ef5b62a647048131f1394c Mon Sep 17 00:00:00 2001
From: default <nobody@localhost>
Date: Sat, 23 Sep 2023 18:46:24 +0200
Subject: Backport from xs.

---
 xs.h | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

(limited to 'xs.h')

diff --git a/xs.h b/xs.h
index 40dd706..1fe210e 100644
--- a/xs.h
+++ b/xs.h
@@ -849,17 +849,18 @@ xs_str *xs_join(const xs_list *list, const char *sep)
             int sz;
 
             /* add the separator */
-            if (c != 0) {
+            if (c != 0 && ssz) {
                 s = xs_realloc(s, offset + ssz);
                 memcpy(s + offset, sep, ssz);
                 offset += ssz;
             }
 
             /* add the element */
-            sz = strlen(v);
-            s = xs_realloc(s, offset + sz);
-            memcpy(s + offset, v, sz);
-            offset += sz;
+            if ((sz = strlen(v)) > 0) {
+                s = xs_realloc(s, offset + sz);
+                memcpy(s + offset, v, sz);
+                offset += sz;
+            }
 
             c++;
         }
-- 
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