diff --git a/src/Makefile b/src/Makefile
index 91253d1..5d173d2 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -67,21 +67,25 @@ LOBJDIR=$(OBJDIR)/$(LINXDIR)
 COMMDEPS=$(INCDIR)/kaleid.h  $(INCDIR)/kaldefs.h $(INCDIR)/kaltypes.h \
          $(INCDIR)/kalmask.h $(INCDIR)/kalmask.h $(INCDIR)/kalassrt.h
 
-COMMSRCS=$(COMMDIR)/string.c $(COMMDIR)/status.c \
-         $(COMMDIR)/convert.c $(COMMDIR)/memory.c
+COMMSRCS=$(COMMDIR)/string.c $(COMMDIR)/status.c $(COMMDIR)/rand.c \
+         $(COMMDIR)/convert.c $(COMMDIR)/memory.c $(COMMDIR)/arith.c
 
-COMMOBJS=$(COBJDIR)/string.o $(COBJDIR)/status.o \
-         $(COBJDIR)/convert.o $(COBJDIR)/memory.o
+COMMOBJS=$(COBJDIR)/string.o $(COBJDIR)/status.o $(COBJDIR)/rand.o \
+         $(COBJDIR)/convert.o $(COBJDIR)/memory.o $(COBJDIR)/arith.o
 
 common: $(COMMDEPS) $(COMMSRCS)
-	$(KCC) -c $(COMMDIR)/string.c -o $(COBJDIR)/string.o
-	$(KCC) -c $(COMMDIR)/status.c -o $(COBJDIR)/status.o
-	$(KCC) -c $(COMMDIR)/memory.c -o $(COBJDIR)/memory.o
+	$(KCC) -c $(COMMDIR)/rand.c   -o $(COBJDIR)/rand.o
+	$(KCC) -c $(COMMDIR)/arith.c   -o $(COBJDIR)/arith.o
+	$(KCC) -c $(COMMDIR)/string.c  -o $(COBJDIR)/string.o
+	$(KCC) -c $(COMMDIR)/status.c  -o $(COBJDIR)/status.o
+	$(KCC) -c $(COMMDIR)/memory.c  -o $(COBJDIR)/memory.o
 	$(KCC) -c $(COMMDIR)/convert.c -o $(COBJDIR)/convert.o
 
 CCC=$(CC2NAME) $(COPTIM) $(CWARNS) $(CINCLUDES)
 
-test-common:  $(COMMSRCS)
+tests:  $(COMMSRCS)
+	$(CCC) -c $(COMMDIR)/rand.c   -o $(COBJDIR)/rand.o
+	$(CCC) -c $(COMMDIR)/arith.c   -o $(COBJDIR)/arith.o
 	$(CCC) -c $(COMMDIR)/string.c -o $(COBJDIR)/string.o
 	$(CCC) -c $(COMMDIR)/status.c -o $(COBJDIR)/status.o
 	$(CCC) -c $(COMMDIR)/memory.c -o $(COBJDIR)/memory.o
diff --git a/src/kaleid/common/arith.c b/src/kaleid/common/arith.c
new file mode 100644
index 0000000..1d3c740
--- /dev/null
+++ b/src/kaleid/common/arith.c
@@ -0,0 +1,53 @@
+//----------------------------------------------------------------------------//
+//                           GNU GPL OS/K                                     //
+//                                                                            //
+//  Authors:    spectral`                                                     //
+//              NeoX                                                          //
+//                                                                            //
+//  Desc:       Arithmetical functions                                        //
+//----------------------------------------------------------------------------//
+
+// do not mask anything
+#define _KALMASK_H
+#include <kaleid.h>
+
+int _osk_abs(int x)
+{
+    return abs(x);
+}
+
+long _osk_labs(long x)
+{
+    return labs(x);
+}
+
+int _osk_min(int x, int y)
+{
+    return min(x, y);
+}
+
+long _osk_lmin(long x, long y)
+{
+    return lmin(x, y);
+}
+
+int _osk_max(int x, int y)
+{
+    return max(x, y);
+}
+
+long _osk_lmax(long x, long y)
+{
+    return lmax(x, y);
+}
+
+div_t _osk_div(int x, int y)
+{
+    return div(x, y);
+}
+
+ldiv_t _osk_ldiv(long x, long y)
+{
+    return ldiv(x, y);
+}
+
diff --git a/src/kaleid/common/memory.c b/src/kaleid/common/memory.c
index d9097eb..81c1785 100644
--- a/src/kaleid/common/memory.c
+++ b/src/kaleid/common/memory.c
@@ -23,7 +23,7 @@ static inline void *_memset_internal(void *ptr, ulong uval, size_t qwords)
 
     // aligned memory write
     for (n = 0; n < qwords; n++) {
-        *(uptr + n) = uval;
+        *uptr++ = uval;
     }
 
     return ptr;
@@ -54,7 +54,7 @@ void *memset(void *ptr, int val, size_t bytes)
 
         _memset_internal(uptr, uval, qwords);
         
-        uptr += qwords * QWORD_SIZE;
+        uptr = (uchar *) ( (ulong)uptr / (qwords * QWORD_SIZE) );
         bytes %= QWORD_SIZE;
     }
     
@@ -113,6 +113,18 @@ void *memsetw(void *ptr, int val, size_t words)
     return ptr;
 }
 
+//
+//  Set "dwords"-many dwords starting from ptr to val
+//  XXX unimplemented
+//
+void *memsetd(void *ptr, int val, size_t dwords)
+{
+    (void)val;
+    (void)dwords;
+
+    return ptr;
+}
+
 //
 //  Set "qwords"-many qwords starting from ptr to val
 //
diff --git a/src/kaleid/common/rand.c b/src/kaleid/common/rand.c
new file mode 100644
index 0000000..b413bbf
--- /dev/null
+++ b/src/kaleid/common/rand.c
@@ -0,0 +1 @@
+int rand(void) { /*STUB*/ return 0; }
diff --git a/src/kaleid/common/test/test-common.c b/src/kaleid/common/test/test-common.c
index c63735b..a528a2e 100644
--- a/src/kaleid/common/test/test-common.c
+++ b/src/kaleid/common/test/test-common.c
@@ -10,7 +10,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 
-#include <kaleid.h>
+void *_osk_memsetw(void *, int, long);
 
 int main(int argc, char *argv[])
 {
@@ -32,7 +32,7 @@ int main(int argc, char *argv[])
     short *xxx = (short *)malloc(sizex * sizeof(short));
     //printf("%ld\n",(ulong)xxx%8);
     //memzero(xxx, sizex);
-    memsetw(xxx, 300, sizex);
+    _osk_memsetw(xxx, 300, sizex);
 
     size_t it;
     for (it = 0; it < sizex; it++) {
diff --git a/src/kaleid/common/test/test-file0.c b/src/kaleid/common/test/test-file0.c
new file mode 100644
index 0000000..0cff677
--- /dev/null
+++ b/src/kaleid/common/test/test-file0.c
@@ -0,0 +1,23 @@
+// random test file
+
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+    long x[4];
+    long *ptr = &x[0];
+    
+    printf("%p\n", ptr);
+    
+    ptr++;
+    printf("%p\n", ptr);
+    
+    ptr = ptr + 1;
+    printf("%p\n", ptr);
+    
+    ptr = (long *)((long)ptr + 1);
+    printf("%p\n", ptr);
+    
+    return 0;
+}
+
diff --git a/src/kaleid/include/kalassrt.h b/src/kaleid/include/kalassrt.h
index 3a345f4..0e1d103 100644
--- a/src/kaleid/include/kalassrt.h
+++ b/src/kaleid/include/kalassrt.h
@@ -11,11 +11,11 @@
 #define _KALASSRT_H
 
 //------------------------------------------//
-//              Useful macros               //
+//                 Macros                   //
 //------------------------------------------//
 
 #ifndef noreturn
-#define noreturn __attribute__((noreturn))
+#define noreturn __attribute__((__noreturn__))
 #endif
 
 #ifndef unlikely(x)
@@ -39,22 +39,6 @@ noreturn void _assert_handler(const char *, const char *, int, const char *);
             _assert_handler(#x, __FILE__, __LINE__, __func__);    \
     } while (0);
 
-//
-// Aliases
-//
-
-#ifndef Assert
-#define Assert assert
-#endif
-
-#ifndef DosAssert
-#define DosAssert assert
-#endif
-
-#ifndef KalAssert
-#define KalAssert assert
-#endif
-
 //------------------------------------------//
 //           When not debugging             //
 //------------------------------------------//
@@ -75,6 +59,18 @@ noreturn void _assert_handler(const char *, const char *, int, const char *);
 
 #endif
 
+//------------------------------------------//
+//           Aliases for assert()           //
+//------------------------------------------//
+
+#ifndef Assert
+#define Assert assert
+#endif
+
+#ifndef KalAssert
+#define KalAssert assert
+#endif
+
 //------------------------------------------//
 //          End of <kalassrt.h>             //
 //------------------------------------------//
diff --git a/src/kaleid/include/kalcrt.h b/src/kaleid/include/kalcrt.h
index 6c1fcd6..33791a8 100644
--- a/src/kaleid/include/kalcrt.h
+++ b/src/kaleid/include/kalcrt.h
@@ -19,14 +19,24 @@
 typedef unsigned long       size_t;
 #endif
 
+#ifndef __status_t
+#define __status_t
+typedef signed long         status_t;
+#endif
+
 #ifndef __va_list
 #define __va_list
 typedef __builtin_va_list   va_list;
 #endif
 
-#ifndef __status_t
-#define __status_t
-typedef signed long         status_t;
+#ifndef __div_t
+#define __div_t
+typedef struct { int quot, rem; }   div_t;
+#endif
+
+#ifndef __ldiv_t
+#define __ldiv_t
+typedef struct { long quot, rem; }  ldiv_t;
 #endif
 
 //------------------------------------------//
@@ -45,6 +55,10 @@ typedef signed long         status_t;
 #define va_start    __builtin_va_start
 #endif
 
+#ifndef va_arg
+#define va_arg      __builtin_va_arg
+#endif
+
 #ifndef va_next
 #define va_next     __builtin_va_next
 #endif
@@ -57,15 +71,29 @@ typedef signed long         status_t;
 //      Memory management utilities         //
 //------------------------------------------//
 
-#if !defined(memset) && !defined(_KALMASK_H)
-#   define  memset      memsetb
+#ifndef memset
+#define memset  memsetb
 #endif
+
+#ifndef memchr
+#define memchr  memchrb
+#endif
+
 void       *memsetb(void *, int, size_t);
 void       *memsetw(void *, int, size_t);
 void       *memsetd(void *, int, size_t);
 void       *memsetq(void *, long, size_t);
 
+void       *memchrb(const void *, int, size_t);
+void       *memchrw(const void *, int, size_t);
+void       *memchrd(const void *, int, size_t);
+void       *memchrq(const void *, long, size_t);
+
+void       *memcpy(void *, const void *, size_t);
+void       *memmove(void *, const void *, size_t);
+
 void       *memzero(void *, size_t);
+int         memcmp(const void *, const void *, size_t);
 
 //------------------------------------------//
 //      String manipulation utilities       //
@@ -86,7 +114,24 @@ int         vsnprintf(char *, size_t, const char *, va_list);
 //        Type conversion utilities         //           
 //------------------------------------------//
 
-char       *itoa(int, char *, int);
+int        *atoi(const char *);
+long       *atol(const char *);
+
+char       *itoa(int,  char *, int);
+char       *ltoa(long, char *, int);
+
+char       *utoa(unsigned int, char *, int);
+char       *ultoa(unsigned long, char *, int);
+
+long            strtol(const char *, char **, int);
+unsigned long   strtoul(const char *, char **, int);
+
+//------------------------------------------//
+//              RNG utilities               //
+//------------------------------------------//
+
+int     rand(void);
+void    srand(unsigned int);
 
 //------------------------------------------//
 //            Diverse utilities             //
@@ -94,6 +139,56 @@ char       *itoa(int, char *, int);
 
 const char *describe_status(status_t) _NO_MASK;
 
+//------------------------------------------//
+//           Arithmetical macros            //
+//------------------------------------------//
+
+#ifndef abs
+#define abs(x) ((x) < 0 ? -x : x)
+#endif
+
+#ifndef labs
+#define labs(x) ((x) < 0 ? -x : x)
+#endif
+
+#ifndef min
+#define min(x,y) ((x) < (y) ? (x) : (y))
+#endif
+
+#ifndef lmin
+#define lmin(x,y) ((x) < (y) ? (x) : (y))
+#endif
+
+#ifndef max
+#define max(x,y) ((x) < (y) ? (x) : (y))
+#endif
+
+#ifndef lmax
+#define lmax(x,y) ((x) < (y) ? (x) : (y))
+#endif
+
+#ifndef __div
+#define __div
+static inline div_t div(int __x, int __y)
+{
+    div_t __res;
+    __res.quot = __x/__y;
+    __res.rem  = __x%__y;
+    return __res;
+}
+#endif
+
+#ifndef __ldiv
+#define __ldiv
+static inline ldiv_t ldiv(long __x, long __y)
+{
+    ldiv_t __res;
+    __res.quot = __x/__y;
+    __res.rem  = __x%__y;
+    return __res;
+}
+#endif
+
 //------------------------------------------//
 //           End of <kalcrt.h>              //
 //------------------------------------------//
diff --git a/src/kaleid/include/kaldefs.h b/src/kaleid/include/kaldefs.h
index d8dedb3..b17c1cc 100644
--- a/src/kaleid/include/kaldefs.h
+++ b/src/kaleid/include/kaldefs.h
@@ -51,11 +51,11 @@
 //------------------------------------------//
 
 #ifndef PACKED
-#define PACKED __attribute__((packed))
+#define PACKED __attribute__((__packed__))
 #endif
 
 #ifndef noreturn
-#define noreturn __attribute__((noreturn))
+#define noreturn __attribute__((__noreturn__))
 #endif
 
 #ifndef alignof
diff --git a/src/kaleid/include/kaleid.h b/src/kaleid/include/kaleid.h
index 80f9b7e..64de82f 100644
--- a/src/kaleid/include/kaleid.h
+++ b/src/kaleid/include/kaleid.h
@@ -20,6 +20,12 @@
 #   endif
 #endif
 
+#ifndef _OSK_SOURCE
+#   ifndef _KALMASK_H
+#       include <kalmask.h>
+#   endif
+#endif
+
 //------------------------------------------//
 //        Include common part of API        //
 //------------------------------------------//
@@ -36,10 +42,6 @@
 #include <kalassrt.h>
 #endif
 
-#if defined(_KALMASK_NEEDED) && !defined(_KALMASK_H)
-#include <kalmask.h>
-#endif
-
 #ifndef _KALCRT_H
 #include <kalcrt.h>
 #endif
diff --git a/src/kaleid/include/kalmask.h b/src/kaleid/include/kalmask.h
index d54d761..078163a 100644
--- a/src/kaleid/include/kalmask.h
+++ b/src/kaleid/include/kalmask.h
@@ -11,36 +11,77 @@
 #define _KALMASK_H
 
 //------------------------------------------//
-//          Not building for OS/K           //
-//------------------------------------------//
-#ifndef _OSK_SOURCE
+
+#define memset      _osk_memsetb
+#define memchr      _osk_memchrb
+
+#define memsetb     _osk_memsetb
+#define memsetw     _osk_memsetw
+#define memsetd     _osk_memsetd
+#define memsetq     _osk_memsetq
+
+#define memchrb     _osk_memchrb
+#define memchrw     _osk_memchrw
+#define memchrd     _osk_memchrd
+#define memchrq     _osk_memchrq
+
+#define memcpy      _osk_memcpy
+#define memmove     _osk_memmove
+
+#define memcmp      _osk_memcmp
+#define memzero     _osk_memzero
 
 //------------------------------------------//
 
-#   define  memcpy      _osk_memcpy
-#   define  memcmp      _osk_memcmp
-#   define  memzero     _osk_memzero
+#define strlen      _osk_strlen
+#define strcpy      _osk_strcpy
+#define strncpy     _osk_strncpy
+#define strrev      _osk_strrev
+#define reverse     _osk_reverse
+
+#define sprintf     _osk_sprintf
+#define snprintf    _osk_snprintf
+#define vsprintf    _osk_vsprintf
+#define vsnprintf   _osk_vsnprintf
 
 //------------------------------------------//
 
-#   define  strlen      _osk_strlen
-#   define  strcpy      _osk_strcpy
-#   define  strncpy     _osk_strncpy
-#   define  strrev      _osk_strrev
-#   define  reverse     _osk_reverse
-#   define  sprintf     _osk_sprintf
-#   define  snprintf    _osk_snprintf
-#   define  vsprintf    _osk_vsprintf
-#   define  vsnprintf   _osk_vsnprintf
+#define atoi        _osk_atoi
+#define atol        _osk_atol
+
+#define itoa        _osk_itoa
+#define ltoa        _osk_ltoa
+
+#define utoa        _osk_utoa
+#define ultoa       _osk_ultoa
+
+#define strtol      _osk_strtol
+#define strtoul     _osk_strtoul
 
 //------------------------------------------//
 
-#   define  itoa        _osk_itoa
-#   define  atoi        _osk_atoi
+#define rand        _osk_rand
+#define srand       _osk_srand
+
+//------------------------------------------//
+
+#define abs         _osk_abs
+#define labs        _osk_labs
+
+#define min         _osk_min
+#define lmin        _osk_lmin
+
+#define max         _osk_max
+#define lmax        _osk_lmax
+
+#define __div
+#define __ldiv
+
+#define div         _osk_div
+#define ldiv        _osk_ldiv
 
 //------------------------------------------//
 //           End of <kalmask.h>             //
 //------------------------------------------//
 
 #endif
-#endif
diff --git a/src/kaleid/kernel/io/terminal.c b/src/kaleid/kernel/io/terminal.c
index fe09e25..dbf5963 100644
--- a/src/kaleid/kernel/io/terminal.c
+++ b/src/kaleid/kernel/io/terminal.c
@@ -67,7 +67,7 @@ status_t ClearTerm(terminal_t *kt)
     Assert(kt->kt_init == INITOK);
 
     LockTerm(kt);
-    ClearTerm_Unlocked(kt);
+    ClearTermUnlocked(kt);
     UnlockTerm(kt);
     
     return SUCCESS;
@@ -102,7 +102,7 @@ status_t PutOnTerm(terminal_t *kt, char ch)
     Assert(kt->kt_init == INITOK);
 
     LockTerm(kt);
-    PutOnTerm_Unlocked(kt, ch);
+    PutOnTermUnlocked(kt, ch);
     UnlockTerm(kt);
 
     return SUCCESS;
@@ -120,7 +120,7 @@ status_t PrintOnTerm(terminal_t *kt, const char *str)
 
     LockTerm(kt);
     while (*str) {
-        PutOnTerm_Unlocked(kt, *str++);
+        PutOnTermUnlocked(kt, *str++);
     }
     UnlockTerm(kt);
     
@@ -138,7 +138,7 @@ status_t PrintOnTerm(terminal_t *kt, const char *str)
 //  Fill terminal with spaces (UNLOCKED version)
 //  XXX would '\0' work too?
 //
-void ClearTerm_Unlocked(terminal_t *kt)
+void ClearTermUnlocked(terminal_t *kt)
 {
     size_t i;
 
@@ -156,7 +156,7 @@ void ClearTerm_Unlocked(terminal_t *kt)
 //
 //  Write a single character on the terminal (UNLOCKED version)
 //
-void PutOnTerm_Unlocked(terminal_t *kt, char ch)
+void PutOnTermUnlocked(terminal_t *kt, char ch)
 {
     int i;
     size_t prev_row;
@@ -169,19 +169,20 @@ void PutOnTerm_Unlocked(terminal_t *kt, char ch)
     // later in this function we actually do the line feed
     else if (ch == '\n') { kt->kt_curr_y = kt->kt_width - 1; }
     
-    // tabulations account for 4 spaces
+    // tabulations account for "TABSIZE" spaces
     else if (ch == '\t') {
         prev_row = kt->kt_curr_y;
         // compiler will optimize this away
         for (i = 0; i < TABSIZE; i++) {
             // tabulations can't spread over two lines
             if (kt->kt_curr_y == prev_row) {
-                PutOnTerm_Unlocked(kt, ' ');
+                PutOnTermUnlocked(kt, ' ');
             }
         }
     }
 
     else {
+        // actually write on the buffer
         const size_t offset = ComputeOffset(kt, kt->kt_curr_x, kt->kt_curr_y);
         kt->kt_buffer[offset] = ComputeEntry(ch, kt->kt_color);
     }
@@ -200,10 +201,10 @@ void PutOnTerm_Unlocked(terminal_t *kt, char ch)
 //
 //  Print string on terminal (UNLOCKED version)
 //
-void PrintOnTerm_Unlocked(terminal_t *kt, const char *str) 
+void PrintOnTermUnlocked(terminal_t *kt, const char *str) 
 {
     while (*str) {
-        PutOnTerm_Unlocked(kt, *str++);
+        PutOnTermUnlocked(kt, *str++);
     }
 }
 
diff --git a/src/kaleid/kernel/io/terminal.h b/src/kaleid/kernel/io/terminal.h
index d7cc988..42f8f90 100644
--- a/src/kaleid/kernel/io/terminal.h
+++ b/src/kaleid/kernel/io/terminal.h
@@ -49,10 +49,10 @@ status_t    PrintOnTerm(terminal_t *, const char *);
 status_t    ChTermColor(terminal_t *, uchar);
 
 #if         defined(_UNLOCKED_IO)
-void        ClearTerm_Unlocked(terminal_t *);
-void        PutOnTerm_Unlocked(terminal_t *, char);
-void        PrintOnTerm_Unlocked(terminal_t *, const char *);
-#define     ChTermColor_Unlocked(kt, col) ((kt)->kt_color = col)
+void        ClearTermUnlocked(terminal_t *);
+void        PutOnTermUnlocked(terminal_t *, char);
+void        PrintOnTermUnlocked(terminal_t *, const char *);
+#define     ChTermColorUnlocked(kt, col) ((kt)->kt_color = col)
 #endif
 
 #ifndef _NO_DEBUG
diff --git a/src/kaleid/kernel/ke/panic.c b/src/kaleid/kernel/ke/panic.c
index 888ac7b..72fa83e 100644
--- a/src/kaleid/kernel/ke/panic.c
+++ b/src/kaleid/kernel/ke/panic.c
@@ -44,22 +44,22 @@ void StartPanic(const char *str)
 
     SetKernState(KSTATE_PANIC);
 
-    ClearTerm_Unlocked(stdout);
+    ClearTermUnlocked(stdout);
     
     if (str == NULL) {
         str = "(no message given)";
     }
     
     if (GetPanicStr()) {
-        PrintOnTerm_Unlocked(stdout, "double panic!\n");
+        PrintOnTermUnlocked(stdout, "double panic!\n");
         HaltCPU();
     }
 
     SetPanicStr(str);
 
     // we cannot lock anything when panicking
-    PrintOnTerm_Unlocked(stdout, "panic! - ");
-    PrintOnTerm_Unlocked(stdout, str);
+    PrintOnTermUnlocked(stdout, "panic! - ");
+    PrintOnTermUnlocked(stdout, str);
 
     while (TRUE) {
         HaltCPU();