diff --git a/Makefile.am b/Makefile.am
index 76f3e29..8653389 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -12,8 +12,8 @@ cmSRC += src/libcm/cmSerialize.c src/libcm/cmSymTbl.c src/libcm/cmFileSys.c src/
 cmHDR += src/libcm/cmData.h src/libcm/cmLib.h src/libcm/cmText.h src/libcm/cmTextTemplate.h
 cmSRC += src/libcm/cmData.c src/libcm/cmLib.c src/libcm/cmText.c src/libcm/cmTextTemplate.c
 
-cmHDR += src/libcm/cmMath.h src/libcm/cmGnuPlot.h src/libcm/cmKeyboard.h
-cmSRC += src/libcm/cmMath.c src/libcm/cmGnuPlot.c src/libcm/cmKeyboard.c
+cmHDR += src/libcm/cmMath.h src/libcm/cmGnuPlot.h src/libcm/cmKeyboard.h  src/libcm/cmStrStream.h
+cmSRC += src/libcm/cmMath.c src/libcm/cmGnuPlot.c src/libcm/cmKeyboard.c  src/libcm/cmStrStream.c
 
 cmHDR += src/libcm/cmLinkedHeap.h src/libcm/cmMallocDebug.h src/libcm/cmLex.h src/libcm/cmJson.h src/libcm/cmPrefs.h src/libcm/cmStack.h src/libcm/cmArray.h
 cmSRC += src/libcm/cmLinkedHeap.c src/libcm/cmMallocDebug.c src/libcm/cmLex.c src/libcm/cmJson.c src/libcm/cmPrefs.c src/libcm/cmStack.c src/libcm/cmArray.c
diff --git a/cmStrStream.c b/cmStrStream.c
new file mode 100644
index 0000000..6c77b33
--- /dev/null
+++ b/cmStrStream.c
@@ -0,0 +1,219 @@
+#include "cmGlobal.h"
+#include "cmRpt.h"
+#include "cmErr.h"
+#include "cmCtx.h"
+#include "cmMem.h"
+#include "cmMallocDebug.h"
+#include "cmLinkedHeap.h"
+#include "cmStrStream.h"
+#include "cmText.h"
+
+typedef struct cmSsBlk_str
+{
+  char*               blk;
+  unsigned            i;
+  struct cmSsBlk_str* link;
+} cmSsBlk_t;
+
+typedef struct
+{
+  cmErr_t     err;
+  cmLHeapH_t  lhH;  
+  unsigned    blkByteCnt;
+  cmSsBlk_t*  blp;
+  cmSsBlk_t*  elp;
+} cmOss_t;
+
+cmOss_t* _cmOssHandleToPtr( cmStrStreamH_t h )
+{
+  cmOss_t* p = (cmOss_t*)h.h;
+  assert(p != NULL );
+  return p;
+}
+
+cmSsRC_t _cmOssDestroy( cmOss_t* p )
+{
+  cmSsRC_t rc = kOkSsRC;
+  cmLHeapDestroy(&p->lhH);
+  cmMemFree(p);
+  return rc;
+}
+
+cmSsRC_t cmOStrStreamCreate( cmCtx_t* ctx, cmStrStreamH_t* hp, unsigned dfltBlkByteCnt )
+{
+  cmSsRC_t rc;
+  if((rc = cmOStrStreamDestroy(hp)) != kOkSsRC )
+    return rc;
+
+  cmOss_t* p = cmMemAllocZ(cmOss_t,1);
+
+  p->blkByteCnt = dfltBlkByteCnt==0 ? 4096 : dfltBlkByteCnt;
+
+  cmErrSetup(&p->err,&ctx->rpt,"OStrStream");
+  
+  if( cmLHeapIsValid(p->lhH = cmLHeapCreate(p->blkByteCnt+sizeof(cmSsBlk_t),ctx)) == false )
+  {
+    rc = cmErrMsg(&p->err,kLHeapMemFailSsRC,"Linked heap allocation failed.");
+    goto errLabel;
+  }
+  
+  hp->h = p;
+
+ errLabel:
+  if(rc != kOkSsRC )
+    _cmOssDestroy(p);
+
+  return rc;
+}
+
+cmSsRC_t cmOStrStreamDestroy(cmStrStreamH_t* hp )
+{
+  cmSsRC_t rc = kOkSsRC;
+
+  if( hp==NULL || cmOStrStreamIsValid(*hp)==false )
+    return rc;
+
+  cmOss_t* p = _cmOssHandleToPtr(*hp);
+
+  if((rc = _cmOssDestroy(p)) != kOkSsRC )
+    return rc;
+
+  hp->h = NULL;
+
+  return rc;
+}
+
+bool     cmOStrStreamIsValid( cmStrStreamH_t h )
+{ return h.h != NULL; }
+
+
+cmSsRC_t cmOStrStreamWrite(     cmStrStreamH_t h, const void* vp, unsigned byteCnt )
+{
+  cmSsRC_t rc = kOkSsRC;
+  cmOss_t* p  = _cmOssHandleToPtr(h);
+  char*    cp = (char*)vp;
+  do
+  {
+    // if a blk exists
+    if( p->elp != NULL )
+    {
+      // copy as much of vp[] as possible into the current end block
+      unsigned n = cmMin(byteCnt, p->blkByteCnt -  p->elp->i);
+      memcpy(p->elp->blk,cp,n);
+      byteCnt    -= n;
+      p->elp->i  += n;      
+    }
+    
+    // if all of vp[] has been copied then we are done
+    if( byteCnt == 0 )
+      break;
+
+    assert( p->elp==NULL || p->elp->i == p->blkByteCnt );
+
+    // allocate a new block
+    cmSsBlk_t* nbp = (cmSsBlk_t*)cmLHeapAlloc(p->lhH,p->blkByteCnt+sizeof(cmSsBlk_t));
+    nbp->blk  = (char*)(nbp + 1);
+    nbp->i    = 0;
+    nbp->link = NULL;
+
+    // end the new blk onto the end of the list
+    if( p->elp == NULL )
+      p->blp = nbp;
+    else
+      p->elp->link = nbp;
+
+    p->elp = nbp;
+    
+  }while(1);
+
+  return rc;
+}
+
+cmSsRC_t cmOStrStreamWriteStr(  cmStrStreamH_t h, const cmChar_t* str )
+{
+  if( str == NULL )
+    return kOkSsRC;
+
+  return cmOStrStreamWrite(h,str,strlen(str));
+}
+
+cmSsRC_t cmOStrStreamVPrintf(   cmStrStreamH_t h, const cmChar_t* fmt, va_list vl )  
+{
+  cmChar_t* s = cmTsVPrintfP(NULL,fmt,vl);
+  cmSsRC_t rc = cmOStrStreamWriteStr(h,s);
+  cmMemFree(s);
+  return rc;
+}
+
+cmSsRC_t cmOStrStreamPrintf(    cmStrStreamH_t h, const cmChar_t* fmt, ... )
+{
+  va_list vl;
+  va_start(vl,fmt);
+  cmSsRC_t rc = cmOStrStreamVPrintf(h,fmt,vl);
+  va_end(vl);
+  return rc;
+}
+
+unsigned  cmOStrStreamByteCount( cmStrStreamH_t h )
+{
+  unsigned   n  = 0;
+  cmOss_t*   p  = _cmOssHandleToPtr(h);
+  cmSsBlk_t* bp = p->blp;
+
+  for(; bp!=NULL; bp=bp->link)
+    n += bp->i;
+
+  return n;
+}
+
+unsigned  _cmOssCopyBuf( cmOss_t* p, char* buf, unsigned n )
+{
+  unsigned i   = 0;
+  cmSsBlk_t* bp = p->blp;
+
+  for(; bp!=NULL; bp=bp->link)
+  {
+    assert( i + bp->i <= n );
+
+    memcpy(buf+i,bp->blk,bp->i);
+    i += bp->i;
+  }
+
+  return i;
+}
+
+void*     cmOStrStreamAllocBuf(  cmStrStreamH_t h )
+{
+  unsigned   n  = cmOStrStreamByteCount(h);
+  cmOss_t*   p  = _cmOssHandleToPtr(h);
+
+  if( n == 0 )
+    return NULL;
+
+  char*    buf = cmMemAlloc(char,n);
+
+  unsigned i = _cmOssCopyBuf(p,buf,n);
+
+  assert(i==n);
+
+  return buf;
+}
+
+cmChar_t* cmOStrStreamAllocText( cmStrStreamH_t h )
+{
+  unsigned   n  = cmOStrStreamByteCount(h);
+  cmOss_t*   p  = _cmOssHandleToPtr(h);
+
+  if( n == 0 )
+    return NULL;
+
+  char*    buf = cmMemAlloc(char,n+1);
+
+  unsigned i = _cmOssCopyBuf(p,buf,n);
+
+  assert(i==n);
+
+  buf[n] = 0;
+
+  return buf;
+}
diff --git a/cmStrStream.h b/cmStrStream.h
new file mode 100644
index 0000000..dcba2c4
--- /dev/null
+++ b/cmStrStream.h
@@ -0,0 +1,39 @@
+#ifndef cmStrStream_h
+#define cmStrStream_h
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+  enum
+  {
+    kOkSsRC = cmOkRC,
+    kLHeapMemFailSsRC
+  };
+
+  typedef cmHandle_t cmStrStreamH_t;
+  typedef cmRC_t     cmSsRC_t;
+
+  extern cmStrStreamH_t cmStrStreamNullHandle_t;
+
+
+  cmSsRC_t cmOStrStreamCreate( cmCtx_t* ctx, cmStrStreamH_t* hp, unsigned dfltBlkByteCnt );
+  cmSsRC_t cmOStrStreamDestroy(cmStrStreamH_t* hp );
+
+  bool     cmOStrStreamIsValid( cmStrStreamH_t h );
+
+  cmSsRC_t cmOStrStreamWrite(     cmStrStreamH_t h, const void* dp, unsigned byteCnt );
+  cmSsRC_t cmOStrStreamWriteStr(  cmStrStreamH_t h, const cmChar_t* str );
+  cmSsRC_t cmOStrStreamVPrintf(   cmStrStreamH_t h, const cmChar_t* fmt, va_list vl );  
+  cmSsRC_t cmOStrStreamPrintf(    cmStrStreamH_t h, const cmChar_t* fmt, ... );
+
+  unsigned  cmOStrStreamByteCount( cmStrStreamH_t h );
+  void*     cmOStrStreamAllocBuf(  cmStrStreamH_t h );
+  cmChar_t* cmOStrStreamAllocText( cmStrStreamH_t h );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif