diff --git a/porting/liteos_m/kernel/BUILD.gn b/porting/liteos_m/kernel/BUILD.gn
index f638d4862f58ac4e92656b7fd9beba9357a54304..1008f2e8b08ceebb5060843b312c8fb2279179bb 100644
--- a/porting/liteos_m/kernel/BUILD.gn
+++ b/porting/liteos_m/kernel/BUILD.gn
@@ -63,6 +63,7 @@ static_library(libc) {
     "src/ctype/tolower.c",
     "src/ctype/toupper.c",
     "src/ctype/isprint.c",
+    "src/ctype/__ctype_get_mb_cur_max.c",
     "src/misc/dirname.c",
     "src/locale/__lctrans.c",
     "src/locale/langinfo.c",
@@ -96,6 +97,7 @@ static_library(libc) {
     "src/stdio/feof.c",
     "src/stdio/fopen.c",
     "src/stdio/stdout.c",
+    "src/stdio/stdin.c",
     "src/time/strptime.c",
     "src/time/strftime.c",
     "src/time/__year_to_secs.c",
diff --git a/porting/liteos_m/kernel/src/ctype/__ctype_get_mb_cur_max.c b/porting/liteos_m/kernel/src/ctype/__ctype_get_mb_cur_max.c
new file mode 100644
index 0000000000000000000000000000000000000000..8e946fc12bcfcf17ebe672e13ab05b163b242f5b
--- /dev/null
+++ b/porting/liteos_m/kernel/src/ctype/__ctype_get_mb_cur_max.c
@@ -0,0 +1,7 @@
+#include <stdlib.h>
+#include "locale_impl.h"
+
+size_t __ctype_get_mb_cur_max()
+{
+	return MB_CUR_MAX;
+}
diff --git a/porting/liteos_m/kernel/src/stdio/stdin.c b/porting/liteos_m/kernel/src/stdio/stdin.c
new file mode 100644
index 0000000000000000000000000000000000000000..5aa5262c2a5c8822f9006431898887789421c6e1
--- /dev/null
+++ b/porting/liteos_m/kernel/src/stdio/stdin.c
@@ -0,0 +1,17 @@
+#include "stdio_impl.h"
+
+#undef stdin
+
+static unsigned char buf[BUFSIZ+UNGET];
+hidden FILE __stdin_FILE = {
+	.buf = buf+UNGET,
+	.buf_size = sizeof buf-UNGET,
+	.fd = 0,
+	.flags = F_PERM | F_NOWR,
+	.read = __stdio_read,
+	.seek = __stdio_seek,
+	.close = __stdio_close,
+	.lock = -1,
+};
+FILE *const stdin = &__stdin_FILE;
+FILE *volatile __stdin_used = &__stdin_FILE;