diff --git a/build_linux64/libamsstring4.linux64.a b/build_linux64/libamsstring4.linux64.a
index 5c9e1d8..afea311 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 5b485c7..f8c3ab4 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_convenience1.o b/build_linux64/objstore/amsstring4_convenience1.o
index 838ff70..cc885bb 100644
Binary files a/build_linux64/objstore/amsstring4_convenience1.o and b/build_linux64/objstore/amsstring4_convenience1.o differ
diff --git a/src/amsstring4/amsstring4_class.cpp b/src/amsstring4/amsstring4_class.cpp
index c38044b..f8fa68a 100644
--- a/src/amsstring4/amsstring4_class.cpp
+++ b/src/amsstring4/amsstring4_class.cpp
@@ -721,7 +721,7 @@ namespace ams
         bool beq;
         bool b1,b2;
     
-        I = 0;
+        I = indstart;
         J = 0;
         while(I<length&&qf==0)
         {
@@ -767,7 +767,46 @@ namespace ams
     
         return ret;
     }
-    
+
+    int amsstring::findright(const amsstring findstr, const int indstart, const bool casesens) const
+    {
+      int ret = -1;
+      
+      ret = findright(findstr.cstring,indstart,casesens);
+
+      return ret;
+    }
+
+    int amsstring::findright(const ams_chartype *findstr, const int indstart, const bool casesens) const
+    {
+      int ret = -1;
+      //todo
+
+      return ret;
+    }
+
+    int amsstring::findright(const ams_chartype c, const int indstart, const bool casesens) const
+    {
+      int ret = -1;
+      //todo
+
+      bool b1,b2,qf;
+      int I;
+
+      for(I=length-indstart-1;I>=0;I--)
+      {
+        b1 = casesens&&(cstring[I]==c);
+        b2 = (!casesens)&&(ams::tolower(cstring[I])==ams::tolower(c));
+        if(b1 || b2)
+        {
+          ret = I;
+          break;
+        }
+      }
+
+      return ret;
+    }
+   
     void amsstring::tolower()
     {
       std::locale loc;
diff --git a/src/amsstring4/amsstring4_convenience1.cpp b/src/amsstring4/amsstring4_convenience1.cpp
index 632a82a..e33d584 100644
--- a/src/amsstring4/amsstring4_convenience1.cpp
+++ b/src/amsstring4/amsstring4_convenience1.cpp
@@ -285,6 +285,40 @@ amsstring stripwhitespace(const amsstring &s)
 {
     amsstring ret;
 
+    int I;
+    int ind1;
+    int ind2;
+    ams_chartype c;
+  
+    ind1 = 0;
+    ind2 = 0;
+    for(I=0;I<s.length;I++)
+    {
+        c = s.cstring[I];
+        if(!(isspace(c)||c==' '||c=='\t'))
+        {
+            ind1 = I;
+            break;
+        }
+        }
+        for(I=s.length-1;I>=0;I--)
+        {
+        c = s.cstring[I];
+        if(!(isspace(c)||c==' '||c=='\t'))
+        {
+            ind2 = I+1;
+            break;
+        }
+    }
+
+    ind1 = min<int>(ind1,s.size());
+    ind1 = max<int>(ind1,0);
+    ind2 = min<int>(ind2,s.size());
+    ind2 = max<int>(ind2,0);
+    ind2 = max<int>(ind1,ind2);
+  
+    ret = s.substring(ind1,ind2);
+
     return ret;
 }
 
@@ -292,6 +326,24 @@ amsstring stripallwhitespace(const amsstring &s)
 {
     amsstring ret;
 
+    ret.resize(s.length);
+    //int count;
+    int I;
+    int J;
+    J = 0;
+    ams_chartype c;
+    for(I=0;I<s.length;I++)
+    {
+      c = s.cstring[I];
+      if(!(isspace(c)||c==' '||c=='\t'||c=='\n'||c=='\r'||c=='\f'||c=='\v'||(int)c==9||(int)c==10||(int)c==11||(int)c==12))
+      {
+        ret.cstring[J] = s.cstring[I];
+        J = J + 1;
+      }
+    }
+    ret.resize(J);
+    ret.cstring[ret.length]='\0';
+
     return ret;
 }
 
@@ -301,6 +353,8 @@ amsarray<amsstring> splitext(const amsstring &s)
 {
     amsarray<amsstring> ret;
 
+    //todo
+    
     return ret;
 }
 
@@ -310,6 +364,8 @@ amsarray<amsstring> splitpath(const amsstring &s)
 {
     amsarray<amsstring> ret;
 
+    //todo
+
     return ret;
 }
 
@@ -318,6 +374,8 @@ amsstring select_between(const amsstring &s, const ams_chartype delimitleft, con
 {
     amsstring ret;
 
+    //todo
+
     return ret;
 }
 
@@ -325,6 +383,13 @@ amsstring concatenate(const amsarray<amsstring> &slist)
 {
     amsstring ret;
 
+    int I;
+    ret.resize(0);
+    for(I=0;I<slist.length;I++)
+    {
+        ret.append(slist[I]);
+    }
+
     return ret;
 }