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

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

@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <string.h>
+
+static int rewind_entry(void)
+{
+    long l;
+    char s[81] = {0};
+    char c;
+    int ret = 0;
+    FILE* stream = fopen("fopen_file.txt","w+");
+    if(stream == NULL)
+    {
+        ret = -1;
+        perror("fopen");
+    }
+    else
+    {
+        fprintf(stream,"%s %d %c","a_string",6500,'x');
+        rewind(stream);
+        fscanf(stream,"%s",s);
+        fscanf(stream,"%ld",&l);
+        fscanf(stream," %c",&c);
+
+        if((strcmp(s,"a_string") != 0) || (l != 6500) || (c != 'x'))
+        {
+            ret = -1;
+        }
+
+        fclose(stream);
+    }
+    return ret;
+}
+
+#include <utest.h>
+static void test_rewind(void)
+{
+    uassert_int_equal(rewind_entry(), 0);
+}
+static void testcase(void)
+{
+    UTEST_UNIT_RUN(test_rewind);
+}
+UTEST_TC_EXPORT(testcase, "posix.stdio_h.rewind.c", RT_NULL, RT_NULL, 10);
+