diff --git a/src/base/kprint/kprint.c b/src/base/kprint/kprint.c
index 1323c3c..2fb60a8 100644
--- a/src/base/kprint/kprint.c
+++ b/src/base/kprint/kprint.c
@@ -1,22 +1,112 @@
 #include "../base.h"
+#include "../../String/StringBuilder.h"
 
+Maybe __next_toString(uint16 size, va_list args, StringBuilder* strb){
+    kprint_format format=va_arg(args, kprint_format);
+    if(!format.dataFmtSet)
+        safethrow("format is not set", StringBuilder_free(strb));
+    // detecting type
+    if(!format.typeId) switch(format.dataFmt){
+        case kprint_fmtInt:
+        case kprint_fmtHex:
+        case kprint_fmtBin:
+            switch(size){
+                case 1: format.typeId=kerepTypeId_Int8; break;
+                case 2: format.typeId=kerepTypeId_Int16; break;
+                case 4: format.typeId=kerepTypeId_Int32; break;
+                case 8: format.typeId=kerepTypeId_Int64; break;
+                default: safethrow("typeId is not set, can't autodetect type", StringBuilder_free(strb));
+            }
+            break;
+        case kprint_fmtUInt:
+            switch(size){
+                case 1: format.typeId=kerepTypeId_UInt8; break;
+                case 2: format.typeId=kerepTypeId_UInt16; break;
+                case 4: format.typeId=kerepTypeId_UInt32; break;
+                case 8: format.typeId=kerepTypeId_UInt64; break;
+                default: safethrow("typeId is not set, can't autodetect type", StringBuilder_free(strb));
+            }
+            break;
+        case kprint_fmtFloat:
+            switch(size){
+                case 4: format.typeId=kerepTypeId_Float32; break;
+                case 8: format.typeId=kerepTypeId_Float64; break;
+                default: safethrow("typeId is not set, can't autodetect type", StringBuilder_free(strb));
+            }
+            break;
+        case kprint_fmtChar:
+            if(size!=1)
+                safethrow("typeId is not set, can't autodetect type", StringBuilder_free(strb));
+            format.typeId=kerepTypeId_Char;
+            break;
+        case kprint_fmtString:
+            switch(size){
+                case sizeof(char*): format.typeId=kerepTypeId_CharPtr; break;
+                case sizeof(string): format.typeId=kerepTypeId_string; break;
+                default: safethrow("typeId is not set, can't autodetect type", StringBuilder_free(strb));
+            }
+            break;
+        default: 
+            safethrow("typeId is not set, can't autodetect type", StringBuilder_free(strb));
+    }
+    try(kerepTypeDescriptor_get(format.typeId),mtd,StringBuilder_free(strb));
+    kerepTypeDescriptor typeDesc=*(kerepTypeDescriptor*)mtd.value.VoidPtr;
+    if(size<typeDesc.size)
+        safethrow("sizeof(arg) < arg_typeDesc.size",StringBuilder_free(strb));
+    if(!typeDesc.toString){
+            }
+    else {
+        void* obj=va_arg(args, size);
+        // value is single variable
+        if(size==typeDesc.size){
+            
+        }
+        // value is array
+        else{
+            if(size%typeDesc.size!=0)
+                safethrow("array size is not corresponding to type size",StringBuilder_free(strb));
+            StringBuilder_append_char(strb, '[');
+            uint16 count=size/typeDesc.size;
+            for (uint16 e=1; e<count; e++){
+                StringBuilder_append_char(strb, ' ');
+                try(typeDesc.toString(obj, &format), estr, StringBuilder_free(strb));
+                StringBuilder_append_cptr(strb, estr.value.VoidPtr);
+                StringBuilder_append_char(strb, ',');
+            }
+            StringBuilder_rmchar(strb);
+            StringBuilder_append_char(strb, ' ');
+            StringBuilder_append_char(strb, ']');
+        }
+    }
+}
 
+Maybe __kvsprint(uint8 n, uint16* sizes, va_list args){
+    StringBuilder* strb=StringBuilder_create();
+    for(uint8 i=0; i<n; i++){
+        try(__next_toString(sizes[i], args, strb),_,;);
+    }
+    char* rezult=StringBuilder_build(strb).ptr;
+    return SUCCESS(UniHeap(kerepTypeId_CharPtr, rezult));
+}
 
-/* Maybe __ksprint(uint8 n, uint16 sizes[32], ...){
-    for(uint8 i=0; i<n; i++)
-
+Maybe __ksprint(uint8 n, uint16 sizes[32], ...){
+    va_list args;
+    va_start(args, sizes);
+    try(__kvsprint(n, sizes, args),rezult,;);
+    va_end(args);
+    return rezult;
 }
 
 Maybe __kfprint(FILE* fd, uint8 n, uint16 sizes[32], ...){
-    try(__ksprint(n, sizes, ...), str,;);
-    if(fputs(str.value.VoidPtr, fd)==EOF)
+    va_list args;
+    va_start(args, sizes);
+    try(__kvsprint(n, sizes, args),maybeStr,;);
+    if(fputs(maybeStr.value.VoidPtr, fd)==EOF)
         safethrow("can't write string to file",;);
-    free(str.value.VoidPtr);
+    free(maybeStr.value.VoidPtr);
+    va_end(args);
+    return MaybeNull;
 }
 
 void __kprint(uint8 n, uint16 sizes[32], ...){
-    va_list args;
-    va_start(args, sizes);
-
-    va_end(args);
-} */
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/src/base/kprint/kprint_format.h b/src/base/kprint/kprint_format.h
index 3aa09c2..28e33d6 100644
--- a/src/base/kprint/kprint_format.h
+++ b/src/base/kprint/kprint_format.h
@@ -49,9 +49,6 @@ typedef enum kprint_dataFormat{
 } kprint_dataFmt;
 
 
-static const uint16 kprint_isFmtSet = 0x2000;
-
-
 typedef struct {
     unsigned char fgColorChanged : 1;
     unsigned char bgColorChanged : 1;