Merge anthm's while loop code (thanks tony!) (bug #2907)

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@4551 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 241 insertions, 0 deletions

diff --git a/apps/app_while.c b/apps/app_while.c
new file mode 100755
index 000000000..ab1d9d472
--- /dev/null
+++ b/apps/app_while.c
@@ -0,0 +1,241 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * While Loop and ExecIf Implementations
+ * 
+ * Copyright Anthony Minessale <anthmct@yahoo.com>
+ *
+ * Anthony Minessale <anthmct@yahoo.com>
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License
+ */
+
+
+#include <asterisk/file.h>
+#include <asterisk/logger.h>
+#include <asterisk/channel.h>
+#include <asterisk/utils.h>
+#include <asterisk/config.h>
+#include <asterisk/pbx.h>
+#include <asterisk/module.h>
+#include <asterisk/lock.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+#define ALL_DONE(u,ret) {LOCAL_USER_REMOVE(u); return ret;}
+
+
+static char *exec_app = "ExecIf";
+static char *exec_desc = "  ExecIF (<expr>|<app>|<data>)\n"
+"If <expr> is true, execute and return the result of <app>(<data>)\n\n";
+static char *exec_synopsis = "ExecIF (<expr>|<app>|<data>)";
+
+static char *start_app = "While";
+static char *start_desc = "  While(<expr>)\n"
+"Start a While Loop.  Execution will return to this point when\n"
+"EndWhile is called until expr is no longer true.\n";
+
+static char *start_synopsis = "Start A While Loop";
+
+
+static char *stop_app = "EndWhile";
+static char *stop_desc = "  EndWhile()\n"
+"Return to the previous called While\n\n";
+
+static char *stop_synopsis = "End A While Loop";
+
+static char *tdesc = "";
+
+
+
+STANDARD_LOCAL_USER;
+
+LOCAL_USER_DECL;
+
+static int execif_exec(struct ast_channel *chan, void *data) {
+	int res=0;
+    struct localuser *u;
+	LOCAL_USER_ADD(u);
+	char *myapp = NULL;
+	char *mydata = NULL;
+	char *expr = NULL;
+	struct ast_app *app = NULL;
+
+	expr = ast_strdupa((char *) data);
+	if ((myapp = strchr(expr,'|'))) {
+		*myapp = '\0';
+		myapp++;
+		if ((mydata = strchr(myapp,'|'))) {
+			*mydata = '\0';
+			mydata++;
+		} else
+			mydata = "";
+
+		if(ast_true(expr) && (app = pbx_findapp(myapp))) {
+			res = pbx_exec(chan, app, mydata, 1);
+		}
+	} else {
+		ast_log(LOG_ERROR,"Invalid Syntax.\n");
+		res = -1;
+	}
+		
+	ALL_DONE(u,res);
+}
+
+#define VAR_SIZE 64
+
+
+static char *get_index(struct ast_channel *chan, const char *prefix, int index) {
+	char varname[VAR_SIZE];
+
+	snprintf(varname, VAR_SIZE, "%s_%d", prefix, index);
+	return pbx_builtin_getvar_helper(chan, varname);
+}
+
+
+static int _while_exec(struct ast_channel *chan, void *data, int end)
+{
+	int res=0;
+	struct localuser *u;
+	char *while_pri = NULL;
+	char *goto_str = NULL, *my_name = NULL;
+	char *condition = NULL, *label = NULL;
+	char varname[VAR_SIZE], end_varname[VAR_SIZE];
+	const char *prefix = "WHILE";
+	size_t size=0;
+	int used_index_i = -1, x=0;
+	char used_index[VAR_SIZE] = "0", new_index[VAR_SIZE] = "0";
+	
+	if (!chan) {
+		/* huh ? */
+		return -1;
+	}
+
+	LOCAL_USER_ADD(u);
+
+	/* dont want run away loops if the chan isn't even up
+	   this is up for debate since it slows things down a tad ......
+	*/
+	if (ast_waitfordigit(chan,1) < 0)
+		ALL_DONE(u,-1);
+
+
+	for (x=0;;x++) {
+		if (get_index(chan, prefix, x)) {
+			used_index_i = x;
+		} else 
+			break;
+	}
+	
+	snprintf(used_index, VAR_SIZE, "%d", used_index_i);
+	snprintf(new_index, VAR_SIZE, "%d", used_index_i + 1);
+	
+	if (!end) {
+		condition = ast_strdupa((char *) data);
+	}
+
+	size = strlen(chan->context) + strlen(chan->exten) + 32;
+	my_name = alloca(size);
+	memset(my_name, 0, size);
+	snprintf(my_name, size, "%s_%s_%d", chan->context, chan->exten, chan->priority);
+	
+	if (!label || ast_strlen_zero(label)) {
+		if (end) 
+			label = used_index;
+		else if (!(label = pbx_builtin_getvar_helper(chan, my_name))) {
+			label = new_index;
+			pbx_builtin_setvar_helper(chan, my_name, label);
+		}
+		
+	}
+	
+	snprintf(varname, VAR_SIZE, "%s_%s", prefix, label);
+	while_pri = pbx_builtin_getvar_helper(chan, varname);
+	
+	if ((while_pri = pbx_builtin_getvar_helper(chan, varname)) && !end) {
+		snprintf(end_varname,VAR_SIZE,"END_%s",varname);
+	}
+	
+
+	if (!end && !ast_true(condition)) {
+		/* Condition Met (clean up helper vars) */
+		pbx_builtin_setvar_helper(chan, varname, NULL);
+		pbx_builtin_setvar_helper(chan, my_name, NULL);
+        snprintf(end_varname,VAR_SIZE,"END_%s",varname);
+		if ((goto_str=pbx_builtin_getvar_helper(chan, end_varname))) {
+			pbx_builtin_setvar_helper(chan, end_varname, NULL);
+			ast_parseable_goto(chan, goto_str);
+		}
+		ALL_DONE(u,res);
+	}
+
+	if (!end && !while_pri) {
+		size = strlen(chan->context) + strlen(chan->exten) + 32;
+		goto_str = alloca(size);
+		memset(goto_str, 0, size);
+		snprintf(goto_str, size, "%s|%s|%d", chan->context, chan->exten, chan->priority);
+		pbx_builtin_setvar_helper(chan, varname, goto_str);
+	} 
+
+	else if (end && while_pri) {
+		/* END of loop */
+		snprintf(end_varname, VAR_SIZE, "END_%s", varname);
+		if (! pbx_builtin_getvar_helper(chan, end_varname)) {
+			size = strlen(chan->context) + strlen(chan->exten) + 32;
+			goto_str = alloca(size);
+			memset(goto_str, 0, size);
+			snprintf(goto_str, size, "%s|%s|%d", chan->context, chan->exten, chan->priority+1);
+			pbx_builtin_setvar_helper(chan, end_varname, goto_str);
+		}
+		ast_parseable_goto(chan, while_pri);
+	}
+	
+
+
+
+	ALL_DONE(u, res);
+}
+
+static int while_start_exec(struct ast_channel *chan, void *data) {
+	return _while_exec(chan, data, 0);
+}
+
+static int while_end_exec(struct ast_channel *chan, void *data) {
+	return _while_exec(chan, data, 1);
+}
+
+
+int unload_module(void)
+{
+	STANDARD_HANGUP_LOCALUSERS;
+	ast_unregister_application(start_app);
+	ast_unregister_application(exec_app);
+	return ast_unregister_application(stop_app);
+}
+
+int load_module(void)
+{
+	ast_register_application(start_app, while_start_exec, start_synopsis, start_desc);
+	ast_register_application(exec_app, execif_exec, exec_synopsis, exec_desc);
+	return ast_register_application(stop_app, while_end_exec, stop_synopsis, stop_desc);
+}
+
+char *description(void)
+{
+	return tdesc;
+}
+
+int usecount(void)
+{
+	int res;
+	STANDARD_USECOUNT(res);
+	return res;
+}
+
+char *key()
+{
+	return ASTERISK_GPL_KEY;
+}
+