diff --git a/clibrary.c b/clibrary.c
index c668862..93739c6 100644
--- a/clibrary.c
+++ b/clibrary.c
@@ -321,6 +321,11 @@ void LibGetc(struct ParseState *Parser, struct Value *ReturnValue, struct Value
     ReturnValue->Val->Integer = PlatformGetCharacter();
 }
 
+void LibExit(struct ParseState *Parser, struct Value *ReturnValue, struct Value **Param, int NumArgs)
+{
+    PlatformExit();
+}
+
 #ifdef PICOC_MATH_LIBRARY
 void LibSin(struct ParseState *Parser, struct Value *ReturnValue, struct Value **Param, int NumArgs)
 {
@@ -367,21 +372,6 @@ void LibTanh(struct ParseState *Parser, struct Value *ReturnValue, struct Value
     ReturnValue->Val->FP = math_tanh(Param[0]->Val->FP);
 }
 
-void LibAsinh(struct ParseState *Parser, struct Value *ReturnValue, struct Value **Param, int NumArgs)
-{
-    ReturnValue->Val->FP = math_asinh(Param[0]->Val->FP);
-}
-
-void LibAcosh(struct ParseState *Parser, struct Value *ReturnValue, struct Value **Param, int NumArgs)
-{
-    ReturnValue->Val->FP = math_acosh(Param[0]->Val->FP);
-}
-
-void LibAtanh(struct ParseState *Parser, struct Value *ReturnValue, struct Value **Param, int NumArgs)
-{
-    ReturnValue->Val->FP = math_atanh(Param[0]->Val->FP);
-}
-
 void LibExp(struct ParseState *Parser, struct Value *ReturnValue, struct Value **Param, int NumArgs)
 {
     ReturnValue->Val->FP = math_exp(Param[0]->Val->FP);
@@ -435,6 +425,7 @@ struct LibraryFunction CLibrary[] =
     { LibSPrintf,       "char *sprintf(char *, char *, ...)" },
     { LibGets,          "void gets(char *, int)" },
     { LibGetc,          "int getchar()" },
+    { LibExit,          "void exit()" },
 #ifdef PICOC_MATH_LIBRARY
     { LibSin,           "float sin(float)" },
     { LibCos,           "float cos(float)" },
@@ -445,9 +436,6 @@ struct LibraryFunction CLibrary[] =
     { LibSinh,          "float sinh(float)" },
     { LibCosh,          "float cosh(float)" },
     { LibTanh,          "float tanh(float)" },
-    { LibAsinh,         "float asinh(float)" },
-    { LibAcosh,         "float acosh(float)" },
-    { LibAtanh,         "float atanh(float)" },
     { LibExp,           "float exp(float)" },
     { LibFabs,          "float fabs(float)" },
     { LibLog,           "float log(float)" },
diff --git a/library_surveyor.c b/library_surveyor.c
index 89a3ec8..d86d225 100644
--- a/library_surveyor.c
+++ b/library_surveyor.c
@@ -323,9 +323,9 @@ void Cvpix(struct ParseState *Parser, struct Value *ReturnValue, struct Value **
     x = Param[0]->Val->Integer;
     y = Param[1]->Val->Integer;
     ix = vpix((unsigned char *)FRAME_BUF, x, y);
-    Iy1 = ((ix>>16) & 0x000000FF);  // Y1
-    Iu1 = ((ix>>24) & 0x000000FF);  // U
-    Iv1 = ((ix>>8)  & 0x000000FF);  // V
+    Iy1 = ((ix>>16) & 0x000000FF);  // Y1
+    Iu1 = ((ix>>24) & 0x000000FF);  // U
+    Iv1 = ((ix>>8)  & 0x000000FF);  // V
 }
 
 void Cvscan(struct ParseState *Parser, struct Value *ReturnValue, struct Value **Param, int NumArgs)
@@ -343,11 +343,11 @@ void Cvscan(struct ParseState *Parser, struct Value *ReturnValue, struct Value *
 
 void Cvmean(struct ParseState *Parser, struct Value *ReturnValue, struct Value **Param, int NumArgs) 
 {
-    vmean((unsigned char *)FRAME_BUF);
+    vmean((unsigned char *)FRAME_BUF);
     Iy1 = mean[0];
     Iu1 = mean[1];
     Iv1 = mean[2];
-}
+}
 
 //    search for blob by color, index;  return center point X,Y and width Z
 void Cvblob(struct ParseState *Parser, struct Value *ReturnValue, struct Value **Param, int NumArgs)    {
@@ -657,11 +657,6 @@ void Cnnlearnblob (struct ParseState *Parser, struct Value *ReturnValue, struct
             bloby1[0], bloby2[0], imgWidth, imgHeight);
     nnpack8x8(ix);
     nndisplay(ix);
-}
-
-void Cexit (struct ParseState *Parser, struct Value *ReturnValue, struct Value **Param, int NumArgs) {
-    ExitBuf[40] = 1;
-    longjmp(ExitBuf, 1);
 }
 
 /* list of all library functions and their prototypes */
@@ -719,7 +714,6 @@ struct LibraryFunction PlatformLibrary[] =
     { Cnntest,      "void nntest(int, int, int, int, int, int, int, int)" },
     { Cnnmatchblob, "void nnmatchblob(int)" },
     { Cnnlearnblob, "void nnlearnblob(int)" },
-    { Cexit,        "void exit()" },
     { NULL,         NULL }
 };
 
diff --git a/library_unix.c b/library_unix.c
index 403fef6..9c46f3b 100644
--- a/library_unix.c
+++ b/library_unix.c
@@ -4,9 +4,16 @@ void PlatformLibraryInit()
 {
 }
 
+void Ctest (struct ParseState *Parser, struct Value *ReturnValue, struct Value **Param, int NumArgs) 
+{
+    printf("test(%d)\n", Param[0]->Val->Integer);
+    Param[0]->Val->Integer = 1234;
+}
+
 /* list of all library functions and their prototypes */
 struct LibraryFunction PlatformLibrary[] =
 {
+    { Ctest, "void test(int)" },
     { NULL,         NULL }
 };