[utest][klibc] add rt_sprintf family functions test cases

bsp/stm32/stm32l475-atk-pandora/board/linker_scripts/link.lds

@@ -40,6 +40,12 @@ SECTIONS
         KEEP(*(VSymTab))
         __vsymtab_end = .;
 
+        /* section information for utest */
+        . = ALIGN(4);
+        __rt_utest_tc_tab_start = .;
+        KEEP(*(UtestTcTab))
+        __rt_utest_tc_tab_end = .;
+
         /* section information for initial. */
         . = ALIGN(4);
         __rt_init_start = .;

src/klibc/Kconfig

@@ -1,7 +1,7 @@
 menu "klibc options"
     menu "rt_vsnprintf options"
         config RT_KLIBC_USING_LIBC_VSNPRINTF
-            bool "Enable rt_vsnprintf to use libc vsscanf"
+            bool "Enable rt_vsnprintf to use libc vsnprintf"
             default n
 
         config RT_KLIBC_USING_VSNPRINTF_LONGLONG

src/klibc/rt_vsnprintf_tiny.c

@@ -448,7 +448,7 @@ int rt_vsnprintf(char *buf, rt_size_t size, const char *fmt, va_list args)
             s = va_arg(args, char *);
             if (!s)
             {
-                s = "(NULL)";
+                s = "(null)";
             }
 
             for (len = 0; (len != field_width) && (s[len] != '\0'); len++);

src/klibc/utest/SConscript

@@ -3,7 +3,7 @@ from building import *
 src = []
 
 if GetDepend('RT_USING_CI_ACTION') or GetDepend('RT_UTEST_TC_USING_KLIBC'):
-    src += Glob('tc_*.c')
+    src += Glob('TC_*.c')
 
 group = DefineGroup('utestcases', src, depend = [''])
 

src/klibc/utest/tc_kstdlib.c → src/klibc/utest/TC_kstdlib.c

@@ -1,12 +1,13 @@
 /*
- * Copyright (c) 2006-2019, RT-Thread Development Team
+ * Copyright (c) 2006-2024, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
  * 2024-12-21     Meco Man     the first version
  */
+
 #include <rtklibc.h>
 #include <utest.h>
 
@@ -20,17 +21,17 @@ static rt_err_t utest_tc_cleanup(void)
     return RT_EOK;
 }
 
-static void tc_rt_memcpy_1(void)
+static void TC_rt_memcpy_1(void)
 {
     const char src[] = "Hello, memcpy!";
-    char dest[20];
+    char dest[20] = {0};
     rt_memcpy(dest, src, sizeof(src));
     uassert_true(rt_strcmp(src, dest) == 0);
 }
 
 static void utest_do_tc(void)
 {
-    UTEST_UNIT_RUN(tc_rt_memcpy_1);
+    UTEST_UNIT_RUN(TC_rt_memcpy_1);
 }
 
 UTEST_TC_EXPORT(utest_do_tc, "klibc.kstdlibc", utest_tc_init, utest_tc_cleanup, 1000);