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00026 #include <stdio.h>
00027 #include <stdlib.h>
00028 #include <unistd.h>
00029 #include <string.h>
00030
00031 #include "asterisk/options.h"
00032 #include "asterisk/logger.h"
00033 #include "asterisk/channel.h"
00034 #include "asterisk/chanvars.h"
00035 #include "asterisk/pbx.h"
00036 #include "asterisk/module.h"
00037 #include "asterisk/config.h"
00038
00039 #define STACKVAR "~GOSUB~STACK~"
00040
00041 static const char *tdesc = "Stack Routines";
00042
00043 static const char *app_gosub = "Gosub";
00044 static const char *app_gosubif = "GosubIf";
00045 static const char *app_return = "Return";
00046 static const char *app_pop = "StackPop";
00047
00048 static const char *gosub_synopsis = "Jump to label, saving return address";
00049 static const char *gosubif_synopsis = "Jump to label, saving return address";
00050 static const char *return_synopsis = "Return from gosub routine";
00051 static const char *pop_synopsis = "Remove one address from gosub stack";
00052
00053 static const char *gosub_descrip =
00054 "Gosub([[context|]exten|]priority)\n"
00055 " Jumps to the label specified, saving the return address.\n";
00056 static const char *gosubif_descrip =
00057 "GosubIf(condition?labeliftrue[:labeliffalse])\n"
00058 " If the condition is true, then jump to labeliftrue. If false, jumps to\n"
00059 "labeliffalse, if specified. In either case, a jump saves the return point\n"
00060 "in the dialplan, to be returned to with a Return.\n";
00061 static const char *return_descrip =
00062 "Return()\n"
00063 " Jumps to the last label on the stack, removing it.\n";
00064 static const char *pop_descrip =
00065 "StackPop()\n"
00066 " Removes last label on the stack, discarding it.\n";
00067
00068 STANDARD_LOCAL_USER;
00069
00070 LOCAL_USER_DECL;
00071
00072 static int pop_exec(struct ast_channel *chan, void *data)
00073 {
00074 pbx_builtin_setvar_helper(chan, STACKVAR, NULL);
00075
00076 return 0;
00077 }
00078
00079 static int return_exec(struct ast_channel *chan, void *data)
00080 {
00081 char *label = pbx_builtin_getvar_helper(chan, STACKVAR);
00082
00083 if (ast_strlen_zero(label)) {
00084 ast_log(LOG_ERROR, "Return without Gosub: stack is empty\n");
00085 return -1;
00086 } else if (ast_parseable_goto(chan, label)) {
00087 ast_log(LOG_WARNING, "No next statement after Gosub?\n");
00088 return -1;
00089 }
00090
00091 pbx_builtin_setvar_helper(chan, STACKVAR, NULL);
00092 return 0;
00093 }
00094
00095 static int gosub_exec(struct ast_channel *chan, void *data)
00096 {
00097 char newlabel[AST_MAX_EXTENSION * 2 + 3 + 11];
00098 struct localuser *u;
00099
00100 if (ast_strlen_zero(data)) {
00101 ast_log(LOG_ERROR, "%s requires an argument: %s([[context|]exten|]priority)\n", app_gosub, app_gosub);
00102 return -1;
00103 }
00104
00105 LOCAL_USER_ADD(u);
00106 snprintf(newlabel, sizeof(newlabel), "%s|%s|%d", chan->context, chan->exten, chan->priority + 1);
00107
00108 if (ast_parseable_goto(chan, data)) {
00109 LOCAL_USER_REMOVE(u);
00110 return -1;
00111 }
00112
00113 pbx_builtin_pushvar_helper(chan, STACKVAR, newlabel);
00114 LOCAL_USER_REMOVE(u);
00115
00116 return 0;
00117 }
00118
00119 static int gosubif_exec(struct ast_channel *chan, void *data)
00120 {
00121 struct localuser *u;
00122 char *condition="", *label1, *label2, *args;
00123 int res=0;
00124
00125 if (ast_strlen_zero(data)) {
00126 ast_log(LOG_WARNING, "GosubIf requires an argument\n");
00127 return 0;
00128 }
00129
00130 args = ast_strdupa((char *)data);
00131 if (!args) {
00132 ast_log(LOG_ERROR, "Out of memory\n");
00133 return -1;
00134 }
00135
00136 LOCAL_USER_ADD(u);
00137
00138 condition = strsep(&args, "?");
00139 label1 = strsep(&args, ":");
00140 label2 = args;
00141
00142 if (ast_true(condition)) {
00143 if (label1) {
00144 res = gosub_exec(chan, label1);
00145 }
00146 } else if (label2) {
00147 res = gosub_exec(chan, label2);
00148 }
00149
00150 LOCAL_USER_REMOVE(u);
00151 return res;
00152 }
00153
00154 int unload_module(void)
00155 {
00156 ast_unregister_application(app_return);
00157 ast_unregister_application(app_pop);
00158 ast_unregister_application(app_gosubif);
00159 ast_unregister_application(app_gosub);
00160
00161 STANDARD_HANGUP_LOCALUSERS;
00162
00163 return 0;
00164 }
00165
00166 int load_module(void)
00167 {
00168 ast_register_application(app_pop, pop_exec, pop_synopsis, pop_descrip);
00169 ast_register_application(app_return, return_exec, return_synopsis, return_descrip);
00170 ast_register_application(app_gosubif, gosubif_exec, gosubif_synopsis, gosubif_descrip);
00171 ast_register_application(app_gosub, gosub_exec, gosub_synopsis, gosub_descrip);
00172
00173 return 0;
00174 }
00175
00176 char *description(void)
00177 {
00178 return (char *) tdesc;
00179 }
00180
00181 int usecount(void)
00182 {
00183 int res;
00184
00185 STANDARD_USECOUNT(res);
00186
00187 return res;
00188 }
00189
00190 char *key()
00191 {
00192 return ASTERISK_GPL_KEY;
00193 }