import RT-Thread@9217865c without bsp, libcpu and components/net

examples/utest/testcases/posix/stdio_h/functions/setvbuf_tc.c

@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <string.h>
+
+static char outbuf[BUFSIZ];
+static int setvbuf_entry(void)
+{
+    FILE *stream;
+    char test_data[] = "test setbuf";
+    int ret = 0;
+
+    stream = fopen("fopen_file.txt","w");
+    if (stream == NULL)
+    {
+        perror("fopen fail");
+        ret = -1;
+        goto __exit;
+    }
+    setvbuf(stream, outbuf, _IOLBF, BUFSIZ);
+    fwrite(test_data, sizeof(test_data), 1,stream);
+
+    if(strcmp(test_data, outbuf))
+    {
+        printf("setvbuf test:%s\n",test_data);
+        ret = -1;
+    }
+__exit:
+    fclose(stream);
+    return ret;
+}
+
+#include <utest.h>
+static void test_setvbuf(void)
+{
+    uassert_int_equal(setvbuf_entry(), 0);
+}
+static void testcase(void)
+{
+    UTEST_UNIT_RUN(test_setvbuf);
+}
+UTEST_TC_EXPORT(testcase, "posix.stdio_h.setvbuf.c", RT_NULL, RT_NULL, 10);
+