From 81a520e60edf7b87843dea1e9d9dabfb6f0d8ca8 Mon Sep 17 00:00:00 2001
From: Marco Hinz <mh.codebro@gmail.com>
Date: Mon, 26 Feb 2018 14:24:45 +0100
Subject: [PATCH] vim-patch:8.0.1439: if cscope fails a search Vim may hang

Problem:    If cscope fails a search Vim may hang.
Solution:   Bail out when a search error is encountered. (Safouane Baroudi,
            closes vim/vim#2598)

https://github.com/vim/vim/commit/1274d33493efb6250470a37b9f4432bb31e87d64
---
 src/nvim/if_cscope.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/src/nvim/if_cscope.c b/src/nvim/if_cscope.c
index 773e29693c..5bd1fdfcfb 100644
--- a/src/nvim/if_cscope.c
+++ b/src/nvim/if_cscope.c
@@ -549,7 +549,7 @@ static void cs_reading_emsg(
 static int cs_cnt_matches(size_t idx)
 {
   char *stok;
-  int nlines;
+  int nlines = 0;
 
   char *buf = xmalloc(CSREAD_BUFSIZE);
   for (;; ) {
@@ -569,16 +569,20 @@ static int cs_cnt_matches(size_t idx)
       return CSCOPE_FAILURE;
     }
 
-    /*
-     * If the database is out of date, or there's some other problem,
-     * cscope will output error messages before the number-of-lines output.
-     * Display/discard any output that doesn't match what we want.
-     * Accept "\S*cscope: X lines", also matches "mlcscope".
-     */
-    if ((stok = strtok(buf, (const char *)" ")) == NULL)
+    // If the database is out of date, or there's some other problem,
+    // cscope will output error messages before the number-of-lines output.
+    // Display/discard any output that doesn't match what we want.
+    // Accept "\S*cscope: X lines", also matches "mlcscope".
+    // Bail out for the "Unable to search" error.
+    if (strstr((const char *)stok, "Unable to search database") != NULL) {
+        break;
+    }
+    if ((stok = strtok(buf, (const char *)" ")) == NULL) {
       continue;
-    if (strstr((const char *)stok, "cscope:") == NULL)
+    }
+    if (strstr((const char *)stok, "cscope:") == NULL) {
       continue;
+    }
 
     if ((stok = strtok(NULL, (const char *)" ")) == NULL)
       continue;