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Add LOCAL_PEEK function, as requested by lmadsen.

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@160344 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Tilghman Lesher
2008-12-02 18:39:12 +00:00
parent 41a4bdd1a6
commit 29502d3bac
1 changed files with 59 additions and 0 deletions
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59
apps/app_stack.c
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@@ -142,6 +142,27 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
<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";
@@ -471,6 +492,42 @@ static struct ast_custom_function local_function = {
.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)
{
int old_priority, priority;
@@ -585,6 +642,7 @@ static int unload_module(void)
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 @@ static int load_module(void)
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;
}