From 71474e176014bdab6a5db07c926f4a20df9acbec Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=BA=90=E6=96=87=E9=9B=A8?=
 <41315874+fumiama@users.noreply.github.com>
Date: Wed, 26 Oct 2022 16:16:28 +0800
Subject: [PATCH] fix sigsegv

---
 server.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/server.c b/server.c
index 461bb0d..81364ff 100644
--- a/server.c
+++ b/server.c
@@ -311,8 +311,10 @@ static int close_file_and_send(threadtimer_t *timer, char *data, size_t numbytes
                             puts("<--- break --->"); \
                             break; \
                         } \
-                        buff[0] = store;\
-                        memmove(buff + 1, buff + l + 1, n - 1);\
+                        if(n > 0) { \
+                            buff[0] = store; \
+                            memmove(buff + 1, buff + l + 1, n - 1); \
+                        } \
                         buff[n] = 0;\
                         (p)->numbytes = n;\
                         puts("<--- pass --->");\