diff --git a/smmapdfw/libsmmapdfw/htbuffer.c b/smmapdfw/libsmmapdfw/htbuffer.c
index 42935d8..1104cbc 100644
--- a/smmapdfw/libsmmapdfw/htbuffer.c
+++ b/smmapdfw/libsmmapdfw/htbuffer.c
@@ -93,6 +93,11 @@ htbuffer_t *htbuffer_memcpy_w_offset(htbuffer_t *dest, unsigned int offset, cons
   return dest;
 }
 
+htbuffer_t *htbuffer_clear(htbuffer_t *dest) {
+  memset(dest->buf, 0, dest->current_buf_size);
+  return dest;
+}
+
 htbuffer_t *htbuffer_memcpy(htbuffer_t *dest, const char *src, unsigned int src_size) {
   return htbuffer_memcpy_w_offset(dest, 0, src, src_size);
 }
diff --git a/smmapdfw/libsmmapdfw/htbuffertest.c b/smmapdfw/libsmmapdfw/htbuffertest.c
index b382259..4e497db 100644
--- a/smmapdfw/libsmmapdfw/htbuffertest.c
+++ b/smmapdfw/libsmmapdfw/htbuffertest.c
@@ -163,8 +163,48 @@ int main(int argc, char **args) {
     printf("11. OK\n");
   htbuffer_free(b);
 	   
-	   
+/* ------------------------------------------------------------------------------------------- */
+  #define TEXT12 "aaa"
+  #define TEXT13 "bbb"
+  b = htbuffer_init(512);
+  htbuffer_strcpy(b, TEXT12);
+  htbuffer_strcpy(b, TEXT13);
   
+  if (strcmp(TEXT13, b->buf))
+    printf("12. FAULURE: unexpected content {%s}\n", b->buf);
+  else
+    printf("12. OK\n");
+  htbuffer_free(b);
+  
+/* ------------------------------------------------------------------------------------------- */
+  #define TEXT14 "aaa"
+  #define TEXT15 "bbb"
+  b = htbuffer_init(512);
+  htbuffer_strcpy(b, TEXT14);
+  htbuffer_strcpy(b, "");
+  htbuffer_strcat(b, TEXT15);
+  
+  if (strcmp(TEXT15, b->buf))
+    printf("13. FAULURE: unexpected content {%s}\n", b->buf);
+  else
+    printf("13. OK\n");
+  htbuffer_free(b);
+  
+/* ------------------------------------------------------------------------------------------- */
+  #define TEXT16 "aaa"
+  #define TEXT17 "bbb"
+  #define TEXT17_1 "b"
+  b = htbuffer_init(512);
+  htbuffer_strcpy(b, TEXT16);
+  htbuffer_clear(b);
+  htbuffer_strncat(b, TEXT15, 1);
+  htbuffer_strncat(b, "\0", 1);
+  
+  if (strcmp(TEXT17_1, b->buf))
+    printf("13. FAULURE: unexpected content {%s}\n", b->buf);
+  else
+    printf("13. OK\n");
+  htbuffer_free(b);