enhanced the log_write callback to use as few write system calls as possible.

changed the hcl server to raise an error if .SCRIPT is not followed by actual script text on the same line

hcl/configure

@@ -18220,7 +18220,7 @@ fi
 
 done
 
-for ac_header in dlfcn.h ltdl.h sys/mman.h
+for ac_header in dlfcn.h ltdl.h sys/mman.h sys/uio.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
@@ -18296,7 +18296,7 @@ _ACEOF
 fi
 done
 
-for ac_func in isatty mmap munmap
+for ac_func in isatty mmap munmap readv writev
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"