diff --git a/build/make.linux64.lib.py b/build/make.linux64.lib.py
index 3023958..2e9bb79 100644
--- a/build/make.linux64.lib.py
+++ b/build/make.linux64.lib.py
@@ -14,7 +14,7 @@ depdir = "./dependencies/linux64" #local pre-compiled dependency libraries and t
 installdir = "../../linux64" #directory to install to when finished
 builddir = "./build_linux64"
 
-doinstall = False   #copies the build_output to the install dir when finished
+doinstall = True   #copies the build_output to the install dir when finished
 cc = "g++" #compiler
 cflags = "-fPIC"
 libraries = "-l{}".format(libname)
diff --git a/build/make.linux64.test.py b/build/make.linux64.test.py
index 00ad1e8..1c91f45 100644
--- a/build/make.linux64.test.py
+++ b/build/make.linux64.test.py
@@ -14,7 +14,7 @@ depdir = "./dependencies/linux64" #local pre-compiled dependency libraries and t
 installdir = "../../linux64" #directory to install to when finished
 builddir = "./build_linux64"
 
-doinstall = False   #copies the build_output to the install dir when finished
+doinstall = True   #copies the build_output to the install dir when finished
 cc = "g++" #compiler
 cflags = "-fPIC"
 libraries = "-l{}".format(libname)
diff --git a/build/make.mingw64.lib.py b/build/make.mingw64.lib.py
index 7f87aaf..527659f 100644
--- a/build/make.mingw64.lib.py
+++ b/build/make.mingw64.lib.py
@@ -14,7 +14,7 @@ depdir = "./dependencies/winx64" #local pre-compiled dependency libraries and th
 installdir = "../../winx64" #directory to install to when finished
 builddir = "./build_mingw64"
 
-doinstall = False   #copies the build_output to the install dir when finished
+doinstall = True   #copies the build_output to the install dir when finished
 cc = "x86_64-w64-mingw32-g++" #compiler
 cflags = "-fPIC -O3"
 libraries = "-l{}".format(libname)
diff --git a/build/make.mingw64.test.py b/build/make.mingw64.test.py
index ffab1e8..d1c484e 100644
--- a/build/make.mingw64.test.py
+++ b/build/make.mingw64.test.py
@@ -14,7 +14,7 @@ depdir = "./dependencies/winx64" #local pre-compiled dependency libraries and th
 installdir = "../../winx64" #directory to install to when finished
 builddir = "./build_mingw64"
 
-doinstall = False   #copies the build_output to the install dir when finished
+doinstall = True   #copies the build_output to the install dir when finished
 cc = "x86_64-w64-mingw32-g++" #compiler
 cflags = "-fPIC -O3"
 libraries = "-l{}".format(libname)
diff --git a/build/make.msvc64.lib.py b/build/make.msvc64.lib.py
index 3444204..ffdd27f 100644
--- a/build/make.msvc64.lib.py
+++ b/build/make.msvc64.lib.py
@@ -14,7 +14,7 @@ depdir = "./dependencies/winx64" #local pre-compiled dependency libraries and th
 installdir = "../../winx64" #directory to install to when finished
 builddir = "./build_msvc64"
 
-doinstall = False   #copies the build_output to the install dir when finished
+doinstall = True   #copies the build_output to the install dir when finished
 cc = "cl" #compiler
 cflags = "/O2"
 libraries = "lib{}.lib".format(libname)
diff --git a/build/make.msvc64.test.py b/build/make.msvc64.test.py
index 605e698..56a53f6 100644
--- a/build/make.msvc64.test.py
+++ b/build/make.msvc64.test.py
@@ -14,7 +14,7 @@ depdir = "./dependencies/winx64" #local pre-compiled dependency libraries and th
 installdir = "../../winx64" #directory to install to when finished
 builddir = "./build_msvc64"
 
-doinstall = False   #copies the build_output to the install dir when finished
+doinstall = True   #copies the build_output to the install dir when finished
 cc = "cl" #compiler
 cflags = "/O2"
 libraries = "lib{}.lib".format(libname)
diff --git a/build_linux64/libamsstring4.linux64.a b/build_linux64/libamsstring4.linux64.a
index 259b44d..39fa8e7 100644
Binary files a/build_linux64/libamsstring4.linux64.a and b/build_linux64/libamsstring4.linux64.a differ
diff --git a/build_linux64/objstore/amsstring4_class.o b/build_linux64/objstore/amsstring4_class.o
index 22467d1..b0a9604 100644
Binary files a/build_linux64/objstore/amsstring4_class.o and b/build_linux64/objstore/amsstring4_class.o differ
diff --git a/build_linux64/objstore/amsstring4_portability.o b/build_linux64/objstore/amsstring4_portability.o
index b047824..1b8c2ce 100644
Binary files a/build_linux64/objstore/amsstring4_portability.o and b/build_linux64/objstore/amsstring4_portability.o differ
diff --git a/build_linux64/tests b/build_linux64/tests
index 68fc482..8318d7b 100644
Binary files a/build_linux64/tests and b/build_linux64/tests differ
diff --git a/build_mingw64/libamsstring4.mingw64.a b/build_mingw64/libamsstring4.mingw64.a
new file mode 100644
index 0000000..0a11903
Binary files /dev/null and b/build_mingw64/libamsstring4.mingw64.a differ
diff --git a/build_mingw64/objstore/amsstring4_bintextencoding.o b/build_mingw64/objstore/amsstring4_bintextencoding.o
new file mode 100644
index 0000000..dcd3668
Binary files /dev/null and b/build_mingw64/objstore/amsstring4_bintextencoding.o differ
diff --git a/build_mingw64/objstore/amsstring4_class.o b/build_mingw64/objstore/amsstring4_class.o
new file mode 100644
index 0000000..b075bcc
Binary files /dev/null and b/build_mingw64/objstore/amsstring4_class.o differ
diff --git a/build_mingw64/objstore/amsstring4_portability.o b/build_mingw64/objstore/amsstring4_portability.o
new file mode 100644
index 0000000..391322e
Binary files /dev/null and b/build_mingw64/objstore/amsstring4_portability.o differ
diff --git a/build_mingw64/objstore/amsstring4_template.o b/build_mingw64/objstore/amsstring4_template.o
new file mode 100644
index 0000000..b8a067a
Binary files /dev/null and b/build_mingw64/objstore/amsstring4_template.o differ
diff --git a/build_mingw64/objstore/amsstring4_tests1.o b/build_mingw64/objstore/amsstring4_tests1.o
new file mode 100644
index 0000000..260e76b
Binary files /dev/null and b/build_mingw64/objstore/amsstring4_tests1.o differ
diff --git a/build_mingw64/objstore/amsstring4_unicode.o b/build_mingw64/objstore/amsstring4_unicode.o
new file mode 100644
index 0000000..2183de2
Binary files /dev/null and b/build_mingw64/objstore/amsstring4_unicode.o differ
diff --git a/build_mingw64/tests.exe b/build_mingw64/tests.exe
new file mode 100644
index 0000000..5227de9
Binary files /dev/null and b/build_mingw64/tests.exe differ
diff --git a/ref/testrewrite.scad b/ref/testrewrite.scad
index c9636fc..a3ef7d8 100644
--- a/ref/testrewrite.scad
+++ b/ref/testrewrite.scad
@@ -1,28 +1,28 @@
-
-use <threads1.scad>
-
-
-module acmehexbolt_0p375(L)
-{
-    
-Lh = 0.25;
-Dh = 0.75;
-Dth = 0.375;
-Lth = L-Lh-0.125;
-
-union()
-{
-    translate([0,0,0])
-    {
-        cylinder(d=Dh,h=Lh,$fn=6);
-    }
-    translate([0,0,Lh-0.125])
-    {
-        thread_10tpi(Dth,Lth);
-    }
-}
-
-}
-
-
+
+use <threads1.scad>
+
+
+module acmehexbolt_0p375(L)
+{
+    
+Lh = 0.25;
+Dh = 0.75;
+Dth = 0.375;
+Lth = L-Lh-0.125;
+
+union()
+{
+    translate([0,0,0])
+    {
+        cylinder(d=Dh,h=Lh,$fn=6);
+    }
+    translate([0,0,Lh-0.125])
+    {
+        thread_10tpi(Dth,Lth);
+    }
+}
+
+}
+
+
 acmehexbolt_0p375(4);
\ No newline at end of file
diff --git a/src/amsstring4/amsstring4_class.cpp b/src/amsstring4/amsstring4_class.cpp
index fdb1c05..7b4e311 100644
--- a/src/amsstring4/amsstring4_class.cpp
+++ b/src/amsstring4/amsstring4_class.cpp
@@ -141,6 +141,7 @@ namespace ams
       if(newcstring==NULL)
       {
         ret = amsstring_failure;
+        printf("debug: amsstring::resize() - failed to allocate.\n");
         return ret;
       }
 
@@ -151,7 +152,7 @@ namespace ams
           newcstring[I] = cstring[I];
         }
       }
-      for(I=length;I<_newlen+1;I++)
+      for(I=length;I<(_newlen+1);I++)
       {
         newcstring[I] = (ams_chartype) '\0';
       }
@@ -242,6 +243,9 @@ namespace ams
 
       if(this!=&other)
       {
+        if(this->cstring!=NULL) {delete[] this->cstring; this->cstring=NULL;}
+        this->length = 0;
+
         this->length = other.length;
         this->blank = other.blank;
         this->cstring = other.cstring;
diff --git a/src/amsstring4/amsstring4_portability.cpp b/src/amsstring4/amsstring4_portability.cpp
index aa00a94..d19a58d 100644
--- a/src/amsstring4/amsstring4_portability.cpp
+++ b/src/amsstring4/amsstring4_portability.cpp
@@ -122,11 +122,24 @@ int amssprintf_s(char *s, int n, const char *format, ...)
   int ret = 0;
 
   va_list args;
+
+  if(s==NULL) {ret = -1; return ret;}
+  if(format==NULL) 
+  {
+    ret = -2;
+    if(s!=NULL && n>0)
+    {
+      s[0] = '\0';
+    } 
+    return ret;
+  }
+
+
   va_start(args, format);
   //exampleV(b, args);
   //va_arg(val,datatype)
-  if(s!=NULL)
-  {
+  // if(s!=NULL)
+  // {
     #if defined(LINUX) || defined(linux) || defined(__linux__) || defined(__GNUC__)
         //use snprintf
         ret = (int)vsnprintf(s,n,format,args);
@@ -138,7 +151,7 @@ int amssprintf_s(char *s, int n, const char *format, ...)
     #else
         #pragma message("amssprintf_s: Unsupported architecture - neither linux nor mingw64 nor msvc")
     #endif
-  }
+  //}
 
   va_end(args);
   return ret;
@@ -151,6 +164,9 @@ double amsstrtonum(const char *str)
 {
   int q;
   double ret = std::numeric_limits<double>::quiet_NaN();
+
+  if(str==NULL) return ret;
+
   try
   {
     //sscanf(s.cstring,"%lf",&ret);