From 572c00fb747590967b23358bce5baf4d8289756d Mon Sep 17 00:00:00 2001
From: Michael Smith <m@michaelsmith.be>
Date: Tue, 13 Mar 2018 15:45:55 +0100
Subject: [PATCH] Added missing strcat function.

---
 Makefile              |  2 +-
 c_functions/missing.c | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 c_functions/missing.c

diff --git a/Makefile b/Makefile
index 61ef537..1b7c0ee 100644
--- a/Makefile
+++ b/Makefile
@@ -36,7 +36,7 @@ ESPTOOLOPTS	= -ff 40m -fm dio -fs 32m
 TARGET		= app
 
 # which modules (subdirectories) of the project to include in compiling
-MODULES		= driver user easygpio
+MODULES		= driver user easygpio c_functions
 EXTRA_INCDIR    = include $(BUILD_AREA)/esp-open-sdk/esp-open-lwip/include
 #EXTRA_INCDIR    = include
 
diff --git a/c_functions/missing.c b/c_functions/missing.c
new file mode 100644
index 0000000..8688acb
--- /dev/null
+++ b/c_functions/missing.c
@@ -0,0 +1,21 @@
+#include "c_types.h"
+#include "mem.h"
+#include "ets_sys.h"
+#include "osapi.h"
+#include "gpio.h"
+#include "os_type.h"
+
+char *_strcat(char *dest, const char *src)
+{
+  size_t i, j;
+  for (i = 0; dest[i] != '\0'; i++);
+
+  for (j = 0; src[j] != '\0'; j++)
+  {
+    dest[i + j] = src[j];
+  }
+
+  dest[i + j] = '\0';
+
+  return dest;
+}