From b29d6b44781be7d15ddef908ec0068dce4bd467e Mon Sep 17 00:00:00 2001
From: "Sergio R. Caprile" <scaprile@cesanta.com>
Date: Fri, 17 Feb 2023 11:11:31 -0300
Subject: [PATCH] _sbrk in TI

---
 examples/ti/ek-tm4c1294xl-baremetal/syscalls.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/examples/ti/ek-tm4c1294xl-baremetal/syscalls.c b/examples/ti/ek-tm4c1294xl-baremetal/syscalls.c
index 49312476..ff2a9a2e 100644
--- a/examples/ti/ek-tm4c1294xl-baremetal/syscalls.c
+++ b/examples/ti/ek-tm4c1294xl-baremetal/syscalls.c
@@ -12,8 +12,11 @@ void *_sbrk(int incr) {
   extern char _end;
   static unsigned char *heap = NULL;
   unsigned char *prev_heap;
+  unsigned char x = 0, *heap_end = (unsigned char *)((size_t) &x - 512);
+  (void) x;
   if (heap == NULL) heap = (unsigned char *) &_end;
   prev_heap = heap;
+  if (heap + incr > heap_end) return (void *) -1;
   heap += incr;
   return prev_heap;
 }