added (v)sscanf

Author: ZERICO2005

src/libc/include/stdio.h

@@ -113,6 +113,12 @@ int asprintf(char **__restrict p_buffer, const char *__restrict format, ...)
 int vasprintf(char **__restrict p_buffer, const char *__restrict format, va_list va)
     __attribute__((format(__printf__, 2, 0))) __attribute__((nonnull(1)));
 
+int sscanf(const char *__restrict buffer, const char *__restrict format, ...)
+    __attribute__((format(__scanf__, 2, 3)));
+
+int vsscanf(const char *__restrict buffer, const char *__restrict format, va_list va)
+    __attribute__((format(__scanf__, 2, 0)));
+
 void perror(const char *str);
 
 __END_DECLS
@@ -121,7 +127,7 @@ __END_DECLS
 namespace std {
     using ::size_t;
     using ::FILE;
-    
+
     using ::fopen;
     using ::fclose;
     using ::fflush;
@@ -151,6 +157,8 @@ namespace std {
     using ::vfprintf;
     using ::asprintf;
     using ::vasprintf;
+    using ::sscanf;
+    using ::vsscanf;
     using ::perror;
 } /* namespace std */
 #endif /* __cplusplus */