2 files changed, 2 insertions, 1 deletions
diff --git a/src/libstddjb/siovec_gather.c b/src/libstddjb/siovec_gather.c
index a037b0c..4288141 100644
--- a/src/libstddjb/siovec_gather.c
+++ b/src/libstddjb/siovec_gather.c
@@ -12,7 +12,7 @@ size_t siovec_gather (struct iovec const *v, unsigned int n, char *s, size_t max
   {
     size_t len = v[i].iov_len ;
     if (len > max - w) len = max - w ;
-    memmove(s + w, v[i].iov_base, len) ;
+    if (len) memmove(s + w, v[i].iov_base, len) ;
     w += len ;
   }
   return w ;
diff --git a/src/libstddjb/stralloc_copyb.c b/src/libstddjb/stralloc_copyb.c
index 26c3a4c..f32c3e5 100644
--- a/src/libstddjb/stralloc_copyb.c
+++ b/src/libstddjb/stralloc_copyb.c
@@ -5,6 +5,7 @@
 
 int stralloc_copyb (stralloc *sa, char const *s, size_t n)
 {
+  if (!n) return 1 ;
   if (!stralloc_ready(sa, n)) return 0 ;
   memmove(sa->s, s, n) ;
   sa->len = n ;