!49 补充m核posix缺少接口

Merge pull request !49 from lnlan/musl_for_m

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",

porting/liteos_m/kernel/src/ctype/__ctype_get_mb_cur_max.c

+#include <stdlib.h>
+#include "locale_impl.h"
+
+size_t __ctype_get_mb_cur_max()
+{
+	return MB_CUR_MAX;
+}

porting/liteos_m/kernel/src/stdio/stdin.c

+#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;