bluetooth: shell: add bt_shell_private.c and bt_shell_private.h

Introduced `bt_shell_private.c` and `bt_shell_private.h` to provide
common functions for the Bluetooth `shell_wall_print`.
These functions are equivalent to `shell_fprintf`, `shell_info`,
`shell_print`, `shell_warn`, `shell_error` and `shell_hexdump`
but without requiring the `sh` parameter.

The cost of the newly added `bt_shell_fprintf_info` ... `_error` functions
will be negligible when there are many individual calls that need to pass
both the `sh` and `color` parameters each time.

Signed-off-by: Pisit Sawangvonganan <pisit@ndrsolution.com>

subsys/bluetooth/host/shell/CMakeLists.txt

@@ -1,7 +1,10 @@
 # SPDX-License-Identifier: Apache-2.0
 
 zephyr_library()
-zephyr_library_sources(bt.c)
+zephyr_library_sources(
+  bt.c
+  bt_shell_private.c
+  )
 zephyr_library_sources_ifdef(CONFIG_BT_CONN gatt.c)
 zephyr_library_sources_ifdef(CONFIG_BT_L2CAP_DYNAMIC_CHANNEL l2cap.c)
 zephyr_library_sources_ifdef(CONFIG_BT_ISO iso.c)

subsys/bluetooth/host/shell/bt_shell_private.c

@@ -0,0 +1,89 @@
+/**
+ * @file bt_shell_private.c
+ * @brief Bluetooth shell private module
+ *
+ * Provide common function which can be shared using privately inside Bluetooth shell.
+ */
+
+/*
+ * Copyright (c) 2024 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/shell/shell_backend.h>
+#include "bt_shell_private.h"
+
+static void wall_vfprintf(enum shell_vt100_color color, const char *fmt, va_list args)
+{
+	int count;
+	const struct shell *sh;
+
+	count = shell_backend_count_get();
+	for (int i = 0; i < count; i++) {
+		va_list args_copy;
+
+		va_copy(args_copy, args);   /* Create a copy of 'args' to safely reuse */
+		sh = shell_backend_get(i);
+		shell_vfprintf(sh, color, fmt, args_copy);
+		va_end(args_copy);          /* Clean up to prevent resource leaks */
+	}
+}
+
+void bt_shell_hexdump(const uint8_t *data, size_t len)
+{
+	int count;
+	const struct shell *sh;
+
+	count = shell_backend_count_get();
+	for (int i = 0; i < count; i++) {
+		sh = shell_backend_get(i);
+		shell_hexdump(sh, data, len);
+	}
+}
+
+void bt_shell_fprintf(enum shell_vt100_color color,
+		      const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	wall_vfprintf(color, fmt, args);
+	va_end(args);
+}
+
+void bt_shell_fprintf_info(const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	wall_vfprintf(SHELL_INFO, fmt, args);
+	va_end(args);
+}
+
+void bt_shell_fprintf_print(const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	wall_vfprintf(SHELL_NORMAL, fmt, args);
+	va_end(args);
+}
+
+void bt_shell_fprintf_warn(const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	wall_vfprintf(SHELL_WARNING, fmt, args);
+	va_end(args);
+}
+
+void bt_shell_fprintf_error(const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	wall_vfprintf(SHELL_ERROR, fmt, args);
+	va_end(args);
+}

subsys/bluetooth/host/shell/bt_shell_private.h

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2024 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef __BT_SHELL_PRIVATE_H
+#define __BT_SHELL_PRIVATE_H
+
+#include <zephyr/shell/shell.h>
+
+/**
+ * @brief printf-like function which sends formatted data stream to the shell.
+ * (Bluetooth context specific)
+ *
+ * This function can be used from the command handler or from threads, but not
+ * from an interrupt context.
+ *
+ * @param[in] color Printed text color.
+ * @param[in] fmt   Format string.
+ * @param[in] ...   List of parameters to print.
+ */
+__printf_like(2, 3) void bt_shell_fprintf(enum shell_vt100_color color,
+					  const char *fmt, ...);
+
+/**
+ * @brief printf-like function which sends formatted data stream to the shell.
+ * (Bluetooth context specific)
+ *
+ * This function can be used from the command handler or from threads, but not
+ * from an interrupt context.
+ *
+ * @param[in] fmt   Format string.
+ * @param[in] ...   List of parameters to print.
+ */
+__printf_like(1, 2) void bt_shell_fprintf_info(const char *fmt, ...);
+__printf_like(1, 2) void bt_shell_fprintf_print(const char *fmt, ...);
+__printf_like(1, 2) void bt_shell_fprintf_warn(const char *fmt, ...);
+__printf_like(1, 2) void bt_shell_fprintf_error(const char *fmt, ...);
+
+/**
+ * @brief Print data in hexadecimal format.
+ * (Bluetooth context specific)
+ *
+ * @param[in] data Pointer to data.
+ * @param[in] len  Length of data.
+ */
+void bt_shell_hexdump(const uint8_t *data, size_t len);
+
+/**
+ * @brief Print info message to the shell.
+ * (Bluetooth context specific)
+ *
+ * @param[in] _ft Format string.
+ * @param[in] ... List of parameters to print.
+ */
+#define bt_shell_info(_ft, ...) \
+	bt_shell_fprintf_info(_ft "\n", ##__VA_ARGS__)
+
+/**
+ * @brief Print normal message to the shell.
+ * (Bluetooth context specific)
+ *
+ * @param[in] _ft Format string.
+ * @param[in] ... List of parameters to print.
+ */
+#define bt_shell_print(_ft, ...) \
+	bt_shell_fprintf_print(_ft "\n", ##__VA_ARGS__)
+
+/**
+ * @brief Print warning message to the shell.
+ * (Bluetooth context specific)
+ *
+ * @param[in] _ft Format string.
+ * @param[in] ... List of parameters to print.
+ */
+#define bt_shell_warn(_ft, ...) \
+	bt_shell_fprintf_warn(_ft "\n", ##__VA_ARGS__)
+
+/**
+ * @brief Print error message to the shell.
+ * (Bluetooth context specific)
+ *
+ * @param[in] _ft Format string.
+ * @param[in] ... List of parameters to print.
+ */
+#define bt_shell_error(_ft, ...) \
+	bt_shell_fprintf_error(_ft "\n", ##__VA_ARGS__)
+
+#endif /* __BT_SHELL_PRIVATE_H */