[klibc] add rt_sscanf

cherry-pick from: https://github.com/PetteriAimonen/Baselibc/blob/master/src/vsscanf.c

BSD license

src/SConscript

@@ -2,7 +2,6 @@ from building import *
 import os
 
 src = Glob('*.c')
-src += Glob('klibc/*.c')
 cwd = GetCurrentDir()
 inc = [os.path.join(cwd, '..', 'include')]
 
@@ -49,4 +48,9 @@ group = DefineGroup('Kernel', src, depend=[''], CPPPATH=inc,
                     LINKFLAGS=LINKFLAGS, LOCAL_CFLAGS=LOCAL_CFLAGS,
                     CPPDEFINES=['__RTTHREAD__'], LOCAL_CPPDEFINES=['__RT_KERNEL_SOURCE__'])
 
+list = os.listdir(cwd)
+for item in list:
+    if os.path.isfile(os.path.join(cwd, item, 'SConscript')):
+        group = group + SConscript(os.path.join(item, 'SConscript'))
+
 Return('group')

src/klibc/SConscript

@@ -0,0 +1,14 @@
+from building import *
+import os
+
+cwd = GetCurrentDir()
+src = Glob('*.c')
+
+group = DefineGroup('klibc', src, depend = [''])
+
+list = os.listdir(cwd)
+for item in list:
+    if os.path.isfile(os.path.join(cwd, item, 'SConscript')):
+        group = group + SConscript(os.path.join(item, 'SConscript'))
+
+Return('group')

src/klibc/kstdio.c

@@ -72,3 +72,25 @@ int rt_sprintf(char *buf, const char *format, ...)
     return n;
 }
 RTM_EXPORT(rt_sprintf);
+
+/**
+ * @brief  This function parses a formatted string from the input string.
+ *
+ * @param  str the input string to be parsed.
+ *
+ * @param  format the format string that specifies how to interpret the input.
+ *
+ * @return The number of input items successfully matched and assigned.
+ */
+int rt_sscanf(const char *str, const char *format, ...)
+{
+    va_list ap;
+    int rv;
+
+    va_start(ap, format);
+    rv = rt_vsscanf(str, format, ap);
+    va_end(ap);
+
+    return rv;
+}
+RTM_EXPORT(rt_sscanf);

src/klibc/rt_vsnprintf_std.c

@@ -6,7 +6,7 @@
  * Change Logs:
  * Date           Author       Notes
  * 2021-11-27     Meco Man     porting for rt_vsnprintf as the fully functional version
- * 2024-11-19     Meco Man     move into rtklibc
+ * 2024-11-19     Meco Man     move to klibc
  */
 
 /**