From c34352549ac1fda8eab9b45260dfda4d2b6488f1 Mon Sep 17 00:00:00 2001
From: Michael 'ASAP' Weinrich <michael@a5ap.net>
Date: Sun, 15 Mar 2020 21:31:48 -0700
Subject: [PATCH] Added Kconfig for enabling 0 length returns from linenoise

---
 components/console/Kconfig               | 10 ++++++++++
 components/console/linenoise/linenoise.c |  8 ++++++--
 2 files changed, 16 insertions(+), 2 deletions(-)
 create mode 100644 components/console/Kconfig

diff --git a/components/console/Kconfig b/components/console/Kconfig
new file mode 100644
index 0000000000..a153b490de
--- /dev/null
+++ b/components/console/Kconfig
@@ -0,0 +1,10 @@
+menu "Linenoise"
+
+    config ESP_LINENOISE_RETURN_ZERO_STRING
+        bool "Return 0 length strings"
+        default n
+        help
+            If enabled linenoise will return 0 length strings if the user presses enter with out typing 
+            a command, if disabled NULL will be returned instead.
+
+endmenu
\ No newline at end of file
diff --git a/components/console/linenoise/linenoise.c b/components/console/linenoise/linenoise.c
index 3b2e1c18e7..0cf86fc0c2 100644
--- a/components/console/linenoise/linenoise.c
+++ b/components/console/linenoise/linenoise.c
@@ -116,6 +116,7 @@
 #include <sys/fcntl.h>
 #include <unistd.h>
 #include "linenoise.h"
+#include "sdkconfig.h"
 
 #define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100
 #define LINENOISE_MAX_LINE 4096
@@ -979,11 +980,14 @@ char *linenoise(const char *prompt) {
     } else {
         count = linenoiseDumb(buf, LINENOISE_MAX_LINE, prompt);
     }
+#ifdef CONFIG_ESP_LINENOISE_RETURN_ZERO_STRING
     if (count >= 0) {
+#else
+    if (count > 0) {
+#endif
         sanitize(buf);
         count = strlen(buf);
-    }
-    if (count < 0) {
+    } else {
         free(buf);
         return NULL;
     }