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Convert stack apps to use ast_storage channel structure

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@57736 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Tilghman Lesher
2007-03-03 16:43:36 +00:00
parent 67df5b67ee
commit d9bd122fce
1 changed files with 126 additions and 36 deletions
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162
apps/app_stack.c
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@@ -45,7 +45,6 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#define STACKVAR "~GOSUB~STACK~"
static const char *app_gosub = "Gosub";
static const char *app_gosubif = "GosubIf";
static const char *app_return = "Return";
@@ -73,55 +72,118 @@ static const char *pop_descrip =
" Removes last label on the stack, discarding it.\n";
static int pop_exec(struct ast_channel *chan, void *data)
static void gosub_free(void *data);
static struct ast_datastore_info stack_info = {
.type = "GOSUB",
.destroy = gosub_free,
};
struct gosub_stack_frame {
AST_LIST_ENTRY(gosub_stack_frame) entries;
/* 100 arguments is all that we support anyway, but this will handle up to 255 */
unsigned char arguments;
int priority;
char *context;
char extension[0];
};
static void gosub_release_frame(struct ast_channel *chan, struct gosub_stack_frame *frame)
{
const char *frame = pbx_builtin_getvar_helper(chan, STACKVAR);
int numargs = 0, i;
unsigned char i;
char argname[15];
/* Pop any arguments for this stack frame off the variable stack */
if (frame) {
numargs = atoi(frame);
for (i = 1; i <= numargs; i++) {
snprintf(argname, sizeof(argname), "ARG%d", i);
/* If chan is not defined, then we're calling it as part of gosub_free,
* and the channel variables will be deallocated anyway. Otherwise, we're
* just releasing a single frame, so we need to clean up the arguments for
* that frame, so that we re-expose the variables from the previous frame
* that were hidden by this one.
*/
if (chan) {
for (i = 1; i <= frame->arguments && i != 0; i++) {
snprintf(argname, sizeof(argname), "ARG%hhd", i);
pbx_builtin_setvar_helper(chan, argname, NULL);
}
}
ast_free(frame);
}
/* Remove the last frame from the Gosub stack */
pbx_builtin_setvar_helper(chan, STACKVAR, NULL);
static struct gosub_stack_frame *gosub_allocate_frame(const char *context, const char *extension, int priority, unsigned char arguments)
{
struct gosub_stack_frame *new = NULL;
int len_extension = strlen(extension), len_context = strlen(context);
if ((new = ast_calloc(1, sizeof(*new) + 2 + len_extension + len_context))) {
strcpy(new->extension, extension);
new->context = new->extension + len_extension + 1;
strcpy(new->context, context);
new->priority = priority;
new->arguments = arguments;
}
return new;
}
static void gosub_free(void *data)
{
AST_LIST_HEAD(, gosub_stack_frame) *oldlist = data;
struct gosub_stack_frame *oldframe;
AST_LIST_LOCK(oldlist);
while ((oldframe = AST_LIST_REMOVE_HEAD(oldlist, entries))) {
gosub_release_frame(NULL, oldframe);
}
AST_LIST_UNLOCK(oldlist);
AST_LIST_HEAD_DESTROY(oldlist);
ast_free(oldlist);
}
static int pop_exec(struct ast_channel *chan, void *data)
{
struct ast_datastore *stack_store = ast_channel_datastore_find(chan, &stack_info, NULL);
struct gosub_stack_frame *oldframe;
AST_LIST_HEAD(, gosub_stack_frame) *oldlist;
if (!stack_store) {
ast_log(LOG_WARNING, "%s called with no gosub stack allocated.\n", app_pop);
return 0;
}
oldlist = stack_store->data;
AST_LIST_LOCK(oldlist);
oldframe = AST_LIST_REMOVE_HEAD(oldlist, entries);
AST_LIST_UNLOCK(oldlist);
if (oldframe)
gosub_release_frame(chan, oldframe);
else
ast_log(LOG_DEBUG, "%s called with an empty gosub stack\n", app_pop);
return 0;
}
static int return_exec(struct ast_channel *chan, void *data)
{
const char *label = pbx_builtin_getvar_helper(chan, STACKVAR);
char argname[15], *retval = data;
int numargs, i;
struct ast_datastore *stack_store = ast_channel_datastore_find(chan, &stack_info, NULL);
struct gosub_stack_frame *oldframe;
AST_LIST_HEAD(, gosub_stack_frame) *oldlist;
char *retval = data;
if (ast_strlen_zero(label)) {
if (!stack_store) {
ast_log(LOG_ERROR, "Return without Gosub: stack is unallocated\n");
return -1;
}
oldlist = stack_store->data;
AST_LIST_LOCK(oldlist);
oldframe = AST_LIST_REMOVE_HEAD(oldlist, entries);
AST_LIST_UNLOCK(oldlist);
if (!oldframe) {
ast_log(LOG_ERROR, "Return without Gosub: stack is empty\n");
return -1;
}
/* Pop any arguments for this stack frame off the variable stack */
numargs = atoi(label);
for (i = 1; i <= numargs; i++) {
snprintf(argname, sizeof(argname), "ARG%d", i);
pbx_builtin_setvar_helper(chan, argname, NULL);
}
/* If the label exists, it will always have a ':' */
label = strchr(label, ':') + 1;
if (ast_parseable_goto(chan, label)) {
ast_log(LOG_WARNING, "No next statement after Gosub?\n");
return -1;
}
/* Remove the current frame from the Gosub stack */
pbx_builtin_setvar_helper(chan, STACKVAR, NULL);
ast_explicit_goto(chan, oldframe->context, oldframe->extension, oldframe->priority);
gosub_release_frame(chan, oldframe);
/* Set a return value, if any */
pbx_builtin_setvar_helper(chan, "GOSUB_RETVAL", S_OR(retval, ""));
@@ -130,7 +192,9 @@ static int return_exec(struct ast_channel *chan, void *data)
static int gosub_exec(struct ast_channel *chan, void *data)
{
char newlabel[AST_MAX_EXTENSION + AST_MAX_CONTEXT + 11 + 11 + 4];
struct ast_datastore *stack_store = ast_channel_datastore_find(chan, &stack_info, NULL);
AST_LIST_HEAD(, gosub_stack_frame) *oldlist;
struct gosub_stack_frame *newframe;
char argname[15], *tmp = ast_strdupa(data), *label, *endparen;
int i;
struct ast_module_user *u;
@@ -145,6 +209,28 @@ static int gosub_exec(struct ast_channel *chan, void *data)
u = ast_module_user_add(chan);
if (!stack_store) {
ast_log(LOG_DEBUG, "Channel %s has no datastore, so we're allocating one.\n", chan->name);
stack_store = ast_channel_datastore_alloc(&stack_info, NULL);
if (!stack_store) {
ast_log(LOG_ERROR, "Unable to allocate new datastore. Gosub will fail.\n");
ast_module_user_remove(u);
return -1;
}
oldlist = ast_calloc(1, sizeof(*oldlist));
if (!oldlist) {
ast_log(LOG_ERROR, "Unable to allocate datastore list head. Gosub will fail.\n");
ast_channel_datastore_free(stack_store);
ast_module_user_remove(u);
return -1;
}
stack_store->data = oldlist;
AST_LIST_HEAD_INIT(oldlist);
ast_channel_datastore_add(chan, stack_store);
}
/* Separate the arguments from the label */
/* NOTE: you cannot use ast_app_separate_args for this, because '(' cannot be used as a delimiter. */
label = strsep(&tmp, "(");
@@ -159,10 +245,11 @@ static int gosub_exec(struct ast_channel *chan, void *data)
args2.argc = 0;
/* Create the return address, but don't save it until we know that the Gosub destination exists */
snprintf(newlabel, sizeof(newlabel), "%d:%s|%s|%d", args2.argc, chan->context, chan->exten, chan->priority + 1);
newframe = gosub_allocate_frame(chan->context, chan->exten, chan->priority + 1, args2.argc);
if (ast_parseable_goto(chan, label)) {
ast_log(LOG_ERROR, "Gosub address is invalid: '%s'\n", (char *)data);
ast_free(newframe);
ast_module_user_remove(u);
return -1;
}
@@ -175,8 +262,11 @@ static int gosub_exec(struct ast_channel *chan, void *data)
}
/* And finally, save our return address */
pbx_builtin_pushvar_helper(chan, STACKVAR, newlabel);
ast_log(LOG_DEBUG, "Setting gosub return address to '%s'\n", newlabel);
oldlist = stack_store->data;
AST_LIST_LOCK(oldlist);
AST_LIST_INSERT_HEAD(oldlist, newframe, entries);
AST_LIST_UNLOCK(oldlist);
ast_module_user_remove(u);
return 0;