[asterisk-dev] [asterisk-commits] tilghman: trunk r160344 - /trunk/apps/app_stack.c

[Eliel Sardañons]

When naming variables inside a <para> element you can use:
<variable>foo</variable>

+                       is the same as ${foo}, since the value of
<replaceable>n</replaceable> peeks under 0 levels of

On Tue, Dec 2, 2008 at 4:39 PM, SVN commits to the Asterisk project <
asterisk-commits at lists.digium.com> wrote:

> Author: tilghman
> Date: Tue Dec  2 12:39:12 2008
> New Revision: 160344
>
> URL: http://svn.digium.com/view/asterisk?view=rev&rev=160344
> Log:
> Add LOCAL_PEEK function, as requested by lmadsen.
>
> Modified:
>    trunk/apps/app_stack.c
>
> Modified: trunk/apps/app_stack.c
> URL:
> http://svn.digium.com/view/asterisk/trunk/apps/app_stack.c?view=diff&rev=160344&r1=160343&r2=160344
>
> ==============================================================================
> --- trunk/apps/app_stack.c (original)
> +++ trunk/apps/app_stack.c Tue Dec  2 12:39:12 2008
> @@ -142,6 +142,27 @@
>                        <ref type="application">Return</ref>
>                </see-also>
>        </function>
> +       <function name="LOCAL_PEEK" language="en_US">
> +               <synopsis>
> +                       Retrieve variables hidden by the local gosub stack
> frame.
> +               </synopsis>
> +               <syntax>
> +                       <parameter name="n" required="true" />
> +                       <parameter name="varname" required="true" />
> +               </syntax>
> +               <description>
> +                       <para>Read a variable
> <replaceable>varname</replaceable> hidden by
> +                       <replaceable>n</replaceable> levels of gosub stack
> frames.  Note that ${LOCAL_PEEK(0,foo)}
> +                       is the same as ${foo}, since the value of
> <replaceable>n</replaceable> peeks under 0 levels of
> +                       stack frames; in other words, 0 is the current
> level.  If <replaceable>n</replaceable> exceeds
> +                       the available number of stack frames, then an empty
> string is returned.</para>
> +               </description>
> +               <see-also>
> +                       <ref type="application">Gosub</ref>
> +                       <ref type="application">GosubIf</ref>
> +                       <ref type="application">Return</ref>
> +               </see-also>
> +       </function>
>  ***/
>
>  static const char *app_gosub = "Gosub";
> @@ -469,6 +490,42 @@
>        .name = "LOCAL",
>        .write = local_write,
>        .read = local_read,
> +};
> +
> +static int peek_read(struct ast_channel *chan, const char *cmd, char
> *data, char *buf, size_t len)
> +{
> +       int found = 0, n;
> +       struct ast_var_t *variables;
> +       AST_DECLARE_APP_ARGS(args,
> +               AST_APP_ARG(n);
> +               AST_APP_ARG(name);
> +       );
> +
> +       if (!chan) {
> +               ast_log(LOG_ERROR, "LOCAL_PEEK must be called on an active
> channel\n");
> +               return -1;
> +       }
> +
> +       AST_STANDARD_APP_ARGS(args, data);
> +       n = atoi(args.n);
> +       *buf = '\0';
> +
> +       ast_channel_lock(chan);
> +       AST_LIST_TRAVERSE(&chan->varshead, variables, entries) {
> +               if (!strcmp(args.name, ast_var_name(variables)) && ++found
> > n) {
> +                       ast_copy_string(buf, ast_var_value(variables),
> len);
> +                       break;
> +               }
> +       }
> +       ast_channel_unlock(chan);
> +       return 0;
> +}
> +
> +static struct ast_custom_function peek_function = {
> +       .name = "LOCAL_PEEK",
> +       .synopsis = "Peeks at variables within the variable stack",
> +       .syntax = "LOCAL_PEEK(<n>|<varname>)",
> +       .read = peek_read,
>  };
>
>  static int handle_gosub(struct ast_channel *chan, AGI *agi, int argc, char
> **argv)
> @@ -585,6 +642,7 @@
>        ast_unregister_application(app_gosubif);
>        ast_unregister_application(app_gosub);
>        ast_custom_function_unregister(&local_function);
> +       ast_custom_function_unregister(&peek_function);
>
>        return 0;
>  }
> @@ -607,6 +665,7 @@
>        ast_register_application_xml(app_gosubif, gosubif_exec);
>        ast_register_application_xml(app_gosub, gosub_exec);
>        ast_custom_function_register(&local_function);
> +       ast_custom_function_register(&peek_function);
>
>        return 0;
>  }
>
>
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-- 
Eliel Sardañons
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