[posix] allow disabling CLI for daemon (openthread#9357)

The CLI interface for the posix daemon ise useful for testing and
debugging but may not be useful for release/user builds. on size
sensitive plaforms such as Android, disabling the daemon CLI will
reduce the ot-daemon binary size by around 150 KB.

So this commit defines config
"OPENTHREAD_POSIX_CONFIG_DAEMON_CLI_ENABLE" to make the daemon CLI
interface optional.

src/posix/main.c

@@ -381,7 +381,10 @@ int main(int argc, char *argv[])
 #if !OPENTHREAD_POSIX_CONFIG_DAEMON_ENABLE
     otAppCliInit(instance);
 #endif
+
+#if !OPENTHREAD_POSIX_CONFIG_DAEMON_ENABLE || OPENTHREAD_POSIX_CONFIG_DAEMON_CLI_ENABLE
     IgnoreError(otCliSetUserCommands(kCommands, OT_ARRAY_LENGTH(kCommands), instance));
+#endif
 
     while (true)
     {

src/posix/platform/daemon.cpp

@@ -72,6 +72,18 @@ void GetFilename(Filename &aFilename, const char *aPattern)
 
 } // namespace
 
+int Daemon::OutputFormat(const char *aFormat, ...)
+{
+    int     ret;
+    va_list ap;
+
+    va_start(ap, aFormat);
+    ret = OutputFormatV(aFormat, ap);
+    va_end(ap);
+
+    return ret;
+}
+
 int Daemon::OutputFormatV(const char *aFormat, va_list aArguments)
 {
     static constexpr char truncatedMsg[] = "(truncated ...)";
@@ -244,12 +256,14 @@ void Daemon::SetUp(void)
         DieNowWithMessage("listen", OT_EXIT_ERROR_ERRNO);
     }
 
+#if OPENTHREAD_POSIX_CONFIG_DAEMON_CLI_ENABLE
     otCliInit(
         gInstance,
         [](void *aContext, const char *aFormat, va_list aArguments) -> int {
             return static_cast<Daemon *>(aContext)->OutputFormatV(aFormat, aArguments);
         },
         this);
+#endif
 
     Mainloop::Manager::Get().Add(*this);
 
@@ -349,7 +363,11 @@ void Daemon::Process(const otSysMainloopContext &aContext)
         if (rval > 0)
         {
             buffer[rval] = '\0';
+#if OPENTHREAD_POSIX_CONFIG_DAEMON_CLI_ENABLE
             otCliInputLine(reinterpret_cast<char *>(buffer));
+#else
+            OutputFormat("Error: CLI is disabled!\n");
+#endif
         }
         else
         {

src/posix/platform/daemon.hpp

@@ -47,6 +47,7 @@ class Daemon : public Mainloop::Source, private NonCopyable
     void Process(const otSysMainloopContext &aContext) override;
 
 private:
+    int  OutputFormat(const char *aFormat, ...);
     int  OutputFormatV(const char *aFormat, va_list aArguments);
     void InitializeSessionSocket(void);
 

src/posix/platform/openthread-posix-config.h

@@ -75,6 +75,16 @@
 #define OPENTHREAD_POSIX_CONFIG_DAEMON_ENABLE 0
 #endif
 
+/**
+ * @def OPENTHREAD_POSIX_CONFIG_DAEMON_CLI_ENABLE
+ *
+ * Define to 1 to enable CLI for the posix daemon.
+ *
+ */
+#ifndef OPENTHREAD_POSIX_CONFIG_DAEMON_CLI_ENABLE
+#define OPENTHREAD_POSIX_CONFIG_DAEMON_CLI_ENABLE 1
+#endif
+
 /**
  * RCP bus UART.
  *