cli: Add a function to set up a new cread

Create a init function so that it is easy to use command-line reading.

Signed-off-by: Simon Glass <sjg@chromium.org>

common/cli_readline.c

@@ -424,28 +424,34 @@ int cread_line_process_ch(struct cli_line_state *cls, char ichar)
 	return -EAGAIN;
 }
 
+void cli_cread_init(struct cli_line_state *cls, char *buf, uint buf_size)
+{
+	int init_len = strlen(buf);
+
+	memset(cls, '\0', sizeof(struct cli_line_state));
+	cls->insert = true;
+	cls->buf = buf;
+	cls->len = buf_size;
+
+	if (init_len)
+		cread_add_str(buf, init_len, 0, &cls->num, &cls->eol_num, buf,
+			      buf_size);
+}
+
 static int cread_line(const char *const prompt, char *buf, unsigned int *len,
 		      int timeout)
 {
 	struct cli_ch_state s_cch, *cch = &s_cch;
 	struct cli_line_state s_cls, *cls = &s_cls;
 	char ichar;
-	int init_len = strlen(buf);
 	int first = 1;
 
 	cli_ch_init(cch);
-	memset(cls, '\0', sizeof(struct cli_line_state));
+	cli_cread_init(cls, buf, *len);
-	cls->insert = true;
-	cls->len = *len;
 	cls->prompt = prompt;
-	cls->buf = buf;
 	cls->history = true;
 	cls->cmd_complete = true;
 
-	if (init_len)
-		cread_add_str(buf, init_len, 1, &cls->num, &cls->eol_num, buf,
-			      *len);
-
 	while (1) {
 		int ret;
 

include/cli.h

@@ -32,7 +32,8 @@ struct cli_ch_state {
  * @eol_num: Number of characters in the buffer
  * @insert: true if in 'insert' mode
  * @history: true if history should be accessible
- * @cmd_complete: true if tab completion should be enabled
+ * @cmd_complete: true if tab completion should be enabled (requires @prompt to
+ *	be set)
  * @buf: Buffer containing line
  * @prompt: Prompt for the line
  */
@@ -262,6 +263,20 @@ int cli_ch_process(struct cli_ch_state *cch, int ichar);
  */
 int cread_line_process_ch(struct cli_line_state *cls, char ichar);
 
+/**
+ * cli_cread_init() - Set up a new cread struct
+ *
+ * Sets up a new cread state, with history and cmd_complete set to false
+ *
+ * After calling this, you can use cread_line_process_ch() to process characters
+ * received from the user.
+ *
+ * @cls: CLI line state
+ * @buf: Text buffer containing the initial text
+ * @buf_size: Buffer size, including nul terminator
+ */
+void cli_cread_init(struct cli_line_state *cls, char *buf, uint buf_size);
+
 /** cread_print_hist_list() - Print the command-line history list */
 void cread_print_hist_list(void);