[PATCH 1/2] Add functions to iterate the IO space list.

[John Darrington]

---
 ChangeLog |  9 +++++++++
 src/ios.c | 18 ++++++++++++++++++
 src/ios.h | 14 ++++++++++++++
 3 files changed, 41 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 903d80c5..2b07ae34 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2020-02-22  John Darrington <address@hidden>
+
+       * src/ios.c (ios_begin): New function.
+       * src/ios.c (ios_end): New function.
+       * src/ios.c (ios_next): New function.
+       * src/ios.h (ios_begin): New declaration.
+       * src/ios.h (ios_end): New declaration.
+       * src/ios.h (ios_next): New declaration.
+
 2020-02-21  Jose E. Marchesi  <address@hidden>
 
        * testsuite/poke.pkl/sizeof-1.pk: New test.
diff --git a/src/ios.c b/src/ios.c
index d6b6735d..75eacdaf 100644
--- a/src/ios.c
+++ b/src/ios.c
@@ -317,6 +317,24 @@ ios_set_bias (ios io, ios_off bias)
   io->bias = bias;
 }
 
+ios
+ios_begin (void)
+{
+  return io_list;
+}
+
+bool
+ios_end (const ios io)
+{
+  return (io == NULL);
+}
+
+ios
+ios_next (const ios io)
+{
+  return io->next;
+}
+
 void
 ios_map (ios_map_fn cb, void *data)
 {
diff --git a/src/ios.h b/src/ios.h
index 377510ef..cbe613f9 100644
--- a/src/ios.h
+++ b/src/ios.h
@@ -21,6 +21,7 @@
 
 #include <config.h>
 #include <stdint.h>
+#include <stdbool.h>
 
 /* The following two functions intialize and shutdown the IO poke
    subsystem.  */
@@ -190,6 +191,19 @@ ios ios_search_by_id (int id);
 
 int ios_get_id (ios io);
 
+/* Return the first IO space.  */
+
+ios ios_begin (void);
+
+/* Return the space following IO.  */
+
+ios ios_next (const ios io);
+
+/* Return true iff IO is past the last one.  */
+
+bool ios_end (const ios io);
+
+
 /* Map over all the open IO spaces executing a handler.  */
 
 typedef void (*ios_map_fn) (ios io, void *data);
-- 
2.20.1