sys/shell: make find_handler() public

sys/include/shell.h

@@ -225,6 +225,18 @@ static inline void shell_run(const shell_command_t *commands,
     shell_run_forever(commands, line_buf, len);
 }
 
+/**
+ * @brief           Searches for a handler function associated with a command
+ *
+ * @param[in]       command_list    ptr to array of command structs
+ * @param[in]       command         the command name to search for
+ *
+ * @returns         handler function associated with @p command
+ *                  NULL if the command could not be found
+ */
+shell_command_handler_t shell_find_handler(const shell_command_t *command_list,
+                                           const char *command);
+
 #ifndef __cplusplus
 /**
  * @brief   Define shell command

sys/shell/shell.c

@@ -85,7 +85,7 @@ static enum parse_state escape_toggle(enum parse_state s)
 }
 
 static shell_command_handler_t search_commands(const shell_command_t *entry,
-                                               char *command)
+                                               const char *command)
 {
     for (; entry->name != NULL; entry++) {
         if (strcmp(entry->name, command) == 0) {
@@ -95,7 +95,7 @@ static shell_command_handler_t search_commands(const shell_command_t *entry,
     return NULL;
 }
 
-static shell_command_handler_t search_commands_xfa(char *command)
+static shell_command_handler_t search_commands_xfa(const char *command)
 {
     unsigned n = XFA_LEN(shell_command_t*, shell_commands_xfa);
 
@@ -108,8 +108,8 @@ static shell_command_handler_t search_commands_xfa(char *command)
     return NULL;
 }
 
-static shell_command_handler_t find_handler(
-        const shell_command_t *command_list, char *command)
+shell_command_handler_t shell_find_handler(const shell_command_t *command_list,
+                                           const char *command)
 {
     shell_command_handler_t handler = NULL;
 
@@ -321,7 +321,7 @@ static void handle_input_line(const shell_command_t *command_list, char *line)
     argv[argc] = NULL;
 
     /* then we call the appropriate handler */
-    shell_command_handler_t handler = find_handler(command_list, argv[0]);
+    shell_command_handler_t handler = shell_find_handler(command_list, argv[0]);
     if (handler != NULL) {
         if (IS_USED(MODULE_SHELL_HOOKS)) {
             shell_pre_command_hook(argc, argv);