From 1a95aad7a72348e72f7301abe698757bba748ebd Mon Sep 17 00:00:00 2001
From: Angelos Oikonomopoulos <angelos.oikonomopoulos@fh-luebeck.de>
Date: Thu, 7 Jun 2018 14:26:47 +0000
Subject: [PATCH] Mark shell_commands as const

This enables the compiler to place the array in flash, saving us a bit
of RAM.

Suggested-by: g-oikonomou
---
 os/services/shell/shell-commands.c | 4 ++--
 os/services/shell/shell-commands.h | 2 +-
 os/services/shell/shell.c          | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/os/services/shell/shell-commands.c b/os/services/shell/shell-commands.c
index f2f036eda..67c81b6e1 100644
--- a/os/services/shell/shell-commands.c
+++ b/os/services/shell/shell-commands.c
@@ -345,7 +345,7 @@ PT_THREAD(cmd_log(struct pt *pt, shell_output_func output, char *args))
 static
 PT_THREAD(cmd_help(struct pt *pt, shell_output_func output, char *args))
 {
-  struct shell_command_t *cmd_ptr;
+  const struct shell_command_t *cmd_ptr;
 
   PT_BEGIN(pt);
 
@@ -734,7 +734,7 @@ shell_commands_init(void)
                                     echo_reply_handler);
 }
 /*---------------------------------------------------------------------------*/
-struct shell_command_t shell_commands[] = {
+const struct shell_command_t shell_commands[] = {
   { "help",                 cmd_help,                 "'> help': Shows this help" },
   { "reboot",               cmd_reboot,               "'> reboot': Reboot the board by watchdog_reboot()" },
   { "ip-addr",              cmd_ipaddr,               "'> ip-addr': Shows all IPv6 addresses" },
diff --git a/os/services/shell/shell-commands.h b/os/services/shell/shell-commands.h
index f89703273..4d89d2e4b 100644
--- a/os/services/shell/shell-commands.h
+++ b/os/services/shell/shell-commands.h
@@ -54,7 +54,7 @@ struct shell_command_t {
 };
 
 /* The set of supported commands */
-extern struct shell_command_t shell_commands[];
+extern const struct shell_command_t shell_commands[];
 
 /**
  * Initializes Shell-commands module
diff --git a/os/services/shell/shell.c b/os/services/shell/shell.c
index fcf419880..e16a69b30 100644
--- a/os/services/shell/shell.c
+++ b/os/services/shell/shell.c
@@ -89,7 +89,7 @@ output_prompt(shell_output_func output)
 PT_THREAD(shell_input(struct pt *pt, shell_output_func output, const char *cmd))
 {
   static char *args;
-  static struct shell_command_t *cmd_ptr;
+  static const struct shell_command_t *cmd_ptr;
 
   PT_BEGIN(pt);