Hallo Jeff,
will this have any influence on using hal_status, hal_command or
hal_error and so on from python?
All gladepanal and glade based GUI do use the python interface to hal.
Norbert
Am 15.09.2014 22:43, schrieb Jeff Epler:
> I embarked on a project to modernize hal_lib to use linux-style doubly
> linked lists instead of the homebrew singly-linked lists. One problem
> along the way is halrmt, which uses hal private structures.
>
> This gives a nice simplification of most list traversing code, like
> this example:
> - next = hal_data->comp_list_ptr;
> - while (next != 0) {
> - comp = SHMPTR(next);
> - if (comp->comp_id == id) {
> - /* found a match */
> - return comp;
> - }
> - /* didn't find it yet, look at next one */
> - next = comp->next_ptr;
> - }
> + hal_list_for_each(ptr, &hal_data->comp_list) {
> + comp = hal_list_entry(ptr, hal_comp_t, list);
> + if (comp->comp_id == comp_id) return comp;
> + }
> and also allows easier insertion at list end, and removal of list items.
>
> When halrmt was written, halcmd did not have a nice factored out
> interface. Now it does.
>
> If someone is interested in halrmt continuing to work, she should
> refactor it to use the "portable" APIs of halcmd instead of the private
> APIs.
>
> Use halcmd_parse_cmd or halcmd_parse_line from halcmd.h, illustrated by
> halsh.c. This is a "durable" API that we don't expect to break without
> very good reason.
>
> This also requires a group of output-handling functions to be
> implemented: halcmd_info halcmd_output halcmd_warning halcmd_error
> halcmd_echo, which are all printf-style functions which carry halcmd
> messages of varying severities.
>
> Have a look at src/hal/utils/halsh.c for how halcmd is wrapped for use
> from Tcl.
>
> If this work is not done, I'll ultimately end up disabling halrmt, or
> some halrmt functionality, as I modernize the private hal structures.
>
> Jeff
>
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