New feature: structure delegate streams.

A new kind of stream object which redirects its operations to
the methods of a structure.

* Makefile (OBJS): New object file, strudel.o.

* lib.c (init): Call new strudel_init function.

* lisplib.c (stream_wrap_set_entries,
stream_wrap_instantiate): New static functions.
(lisplib_init): Arrange for autloading of new stream-wrap.tl.

* share/txr/stdlib/stream-wrap.tl: New file.

* stream.c (put_string_s, put_char_s, put_byte_s, get_line_s,
get_char_s, get_byte_s, unget_char_s, unget_byte_s, put_buf_s,
fill_buf_s, flush_s, seek_s, truncate_s, get_prop_s,
set_prop_s, get_error_s, get_error_str_s, clear_error_s,
get_fd_s): New symbol variables.
(stream_init): New symbol variables initialized. Numerous
functions registered via these variables now rather than
intern(...) expressions.

* stream.h (put_string_s, put_char_s, put_byte_s, get_line_s,
get_char_s, get_byte_s, unget_char_s, unget_byte_s, put_buf_s,
fill_buf_s, flush_s, seek_s, truncate_s, get_prop_s,
set_prop_s, get_error_s, get_error_str_s, clear_error_s,
get_fd_s): Declared.

* strudel.c, strudel.h: New files.

1 files changed, 18 insertions, 0 deletions

diff --git a/lisplib.c b/lisplib.c
index 3e437542..4fdc8be9 100644
--- a/lisplib.c
+++ b/lisplib.c
@@ -562,6 +562,23 @@ static val doloop_instantiate(val set_fun)
   return nil;
 }
 
+static val stream_wrap_set_entries(val dlt, val fun)
+{
+  val name[] = {
+    lit("stream-wrap"),
+    nil
+  };
+  set_dlt_entries(dlt, name, fun);
+  return nil;
+}
+
+static val stream_wrap_instantiate(val set_fun)
+{
+  funcall1(set_fun, nil);
+  load(format(nil, lit("~astream-wrap.tl"), stdlib_path, nao));
+  return nil;
+}
+
 static val op_set_entries(val dlt, val fun)
 {
   val name[] = {
@@ -620,6 +637,7 @@ void lisplib_init(void)
   dlt_register(dl_table, keyparams_instantiate, keyparams_set_entries);
   dlt_register(dl_table, ffi_instantiate, ffi_set_entries);
   dlt_register(dl_table, doloop_instantiate, doloop_set_entries);
+  dlt_register(dl_table, stream_wrap_instantiate, stream_wrap_set_entries);
 
   if (!opt_compat || opt_compat >= 185)
     dlt_register(dl_table, op_instantiate, op_set_entries);