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00025 #include "asterisk.h"
00026
00027 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 168546 $")
00028
00029 #include <stdio.h>
00030 #include <stdlib.h>
00031 #include <string.h>
00032 #include <sys/types.h>
00033
00034 #include "asterisk/module.h"
00035 #include "asterisk/channel.h"
00036 #include "asterisk/pbx.h"
00037 #include "asterisk/logger.h"
00038 #include "asterisk/utils.h"
00039 #include "asterisk/app.h"
00040
00041 static int isnull(struct ast_channel *chan, char *cmd, char *data,
00042 char *buf, size_t len)
00043 {
00044 strcpy(buf, data && *data ? "0" : "1");
00045
00046 return 0;
00047 }
00048
00049 static int exists(struct ast_channel *chan, char *cmd, char *data, char *buf,
00050 size_t len)
00051 {
00052 strcpy(buf, data && *data ? "1" : "0");
00053
00054 return 0;
00055 }
00056
00057 static int iftime(struct ast_channel *chan, char *cmd, char *data, char *buf,
00058 size_t len)
00059 {
00060 struct ast_timing timing;
00061 char *expr;
00062 char *iftrue;
00063 char *iffalse;
00064
00065 data = ast_strip_quoted(data, "\"", "\"");
00066 expr = strsep(&data, "?");
00067 iftrue = strsep(&data, ":");
00068 iffalse = data;
00069
00070 if (ast_strlen_zero(expr) || !(iftrue || iffalse)) {
00071 ast_log(LOG_WARNING,
00072 "Syntax IFTIME(<timespec>?[<true>][:<false>])\n");
00073 return -1;
00074 }
00075
00076 if (!ast_build_timing(&timing, expr)) {
00077 ast_log(LOG_WARNING, "Invalid Time Spec.\n");
00078 return -1;
00079 }
00080
00081 if (iftrue)
00082 iftrue = ast_strip_quoted(iftrue, "\"", "\"");
00083 if (iffalse)
00084 iffalse = ast_strip_quoted(iffalse, "\"", "\"");
00085
00086 ast_copy_string(buf, ast_check_timing(&timing) ? S_OR(iftrue, "") : S_OR(iffalse, ""), len);
00087
00088 return 0;
00089 }
00090
00091 static int acf_if(struct ast_channel *chan, char *cmd, char *data, char *buf,
00092 size_t len)
00093 {
00094 AST_DECLARE_APP_ARGS(args1,
00095 AST_APP_ARG(expr);
00096 AST_APP_ARG(remainder);
00097 );
00098 AST_DECLARE_APP_ARGS(args2,
00099 AST_APP_ARG(iftrue);
00100 AST_APP_ARG(iffalse);
00101 );
00102 args2.iftrue = args2.iffalse = NULL;
00103
00104
00105
00106
00107
00108
00109 AST_NONSTANDARD_APP_ARGS(args1, data, '?');
00110 AST_NONSTANDARD_APP_ARGS(args2, args1.remainder, ':');
00111
00112 if (ast_strlen_zero(args1.expr) || !(args2.iftrue || args2.iffalse)) {
00113 ast_log(LOG_WARNING, "Syntax IF(<expr>?[<true>][:<false>]) (expr must be non-null, and either <true> or <false> must be non-null)\n");
00114 ast_log(LOG_WARNING, " In this case, <expr>='%s', <true>='%s', and <false>='%s'\n", args1.expr, args2.iftrue, args2.iffalse);
00115 return -1;
00116 }
00117
00118 args1.expr = ast_strip(args1.expr);
00119 if (args2.iftrue)
00120 args2.iftrue = ast_strip(args2.iftrue);
00121 if (args2.iffalse)
00122 args2.iffalse = ast_strip(args2.iffalse);
00123
00124 ast_copy_string(buf, pbx_checkcondition(args1.expr) ? (S_OR(args2.iftrue, "")) : (S_OR(args2.iffalse, "")), len);
00125
00126 return 0;
00127 }
00128
00129 static int set(struct ast_channel *chan, char *cmd, char *data, char *buf,
00130 size_t len)
00131 {
00132 char *varname;
00133 char *val;
00134
00135 varname = strsep(&data, "=");
00136 val = data;
00137
00138 if (ast_strlen_zero(varname) || !val) {
00139 ast_log(LOG_WARNING, "Syntax SET(<varname>=[<value>])\n");
00140 return -1;
00141 }
00142
00143 varname = ast_strip(varname);
00144 val = ast_strip(val);
00145 pbx_builtin_setvar_helper(chan, varname, val);
00146 ast_copy_string(buf, val, len);
00147
00148 return 0;
00149 }
00150
00151 static struct ast_custom_function isnull_function = {
00152 .name = "ISNULL",
00153 .synopsis = "NULL Test: Returns 1 if NULL or 0 otherwise",
00154 .syntax = "ISNULL(<data>)",
00155 .read = isnull,
00156 };
00157
00158 static struct ast_custom_function set_function = {
00159 .name = "SET",
00160 .synopsis = "SET assigns a value to a channel variable",
00161 .syntax = "SET(<varname>=[<value>])",
00162 .read = set,
00163 };
00164
00165 static struct ast_custom_function exists_function = {
00166 .name = "EXISTS",
00167 .synopsis = "Existence Test: Returns 1 if exists, 0 otherwise",
00168 .syntax = "EXISTS(<data>)",
00169 .read = exists,
00170 };
00171
00172 static struct ast_custom_function if_function = {
00173 .name = "IF",
00174 .synopsis =
00175 "Conditional: Returns the data following '?' if true else the data following ':'",
00176 .syntax = "IF(<expr>?[<true>][:<false>])",
00177 .read = acf_if,
00178 };
00179
00180 static struct ast_custom_function if_time_function = {
00181 .name = "IFTIME",
00182 .synopsis =
00183 "Temporal Conditional: Returns the data following '?' if true else the data following ':'",
00184 .syntax = "IFTIME(<timespec>?[<true>][:<false>])",
00185 .read = iftime,
00186 };
00187
00188 static int unload_module(void)
00189 {
00190 int res = 0;
00191
00192 res |= ast_custom_function_unregister(&isnull_function);
00193 res |= ast_custom_function_unregister(&set_function);
00194 res |= ast_custom_function_unregister(&exists_function);
00195 res |= ast_custom_function_unregister(&if_function);
00196 res |= ast_custom_function_unregister(&if_time_function);
00197
00198 return res;
00199 }
00200
00201 static int load_module(void)
00202 {
00203 int res = 0;
00204
00205 res |= ast_custom_function_register(&isnull_function);
00206 res |= ast_custom_function_register(&set_function);
00207 res |= ast_custom_function_register(&exists_function);
00208 res |= ast_custom_function_register(&if_function);
00209 res |= ast_custom_function_register(&if_time_function);
00210
00211 return res;
00212 }
00213
00214 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Logical dialplan functions");