Add '+foo' option, update sample config

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3888 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/extensions.conf.sample

@@ -67,7 +67,9 @@ TRUNKMSD=1					; MSD digits to strip (usually 1 or 0)
 ; the previous priority was associated with the current extension or not.
 ; The priority "same" or "s" means the same as the previously specified
 ; priority, again regardless of whether the previous entry was for the
-; same extension.  Priorities may also have an alias, or label, in 
+; same extension.  Priorities may be immediately followed by a plus sign
+; and another integer to add that amount (most useful with 's' or 'n').  
+; Priorities may then also have an alias, or label, in 
 ; parenthesis after their name which can be used in goto situations
 ;
 ; Contexts contain several lines, one for each step of each
@@ -78,8 +80,8 @@ TRUNKMSD=1					; MSD digits to strip (usually 1 or 0)
 ; they are listed.
 ;
 ;[context]
-;exten => someexten,priority,application(arg1,arg2,...)
-;exten => someexten,priority,application,arg1|arg2...
+;exten => someexten,priority[+offset][(alias)],application(arg1,arg2,...)
+;exten => someexten,priority[+offset][(alias)],application,arg1|arg2...
 ;
 ; Timing list for includes is 
 ;
@@ -313,7 +315,9 @@ include => demo
 
 ;exten => 6245,hint,SIP/Grandstream1&SIP/Xlite1 ; Channel hints for presence
 ;exten => 6245,1,Dial(SIP/Grandstream1,20,rt)	; permit transfer
-;exten => 6245,1,Dial(${HINT},20,rtT)		; Use hint as listed
+;exten => 6245,n,Dial(${HINT},20,rtT)		; Use hint as listed
+;exten => 6245,n,Voicemail(u6245)		; Voicemail (unavailable)
+;exten => 6245,s+100,Voicemail(b6245)		; Voicemail (busy)
 ;exten => 6361,1,Dial(IAX2/JaneDoe,,rm)		; ring without time limit
 ;exten => 6389,1,Dial(MGCP/aaln/1@192.168.0.14)
 ;exten => 6394,1,Dial(Local/6275/n)		; this will dial ${MARK}

pbx/pbx_config.c

@@ -1649,6 +1649,7 @@ static int pbx_load_module(void)
 						char *stringp=NULL;
 						int ipri = -2;
 						char realext[256]="";
+						char *plus;
 						tc = strdup(v->value);
 						if(tc!=NULL){
 							stringp=tc;
@@ -1668,6 +1669,11 @@ static int pbx_load_module(void)
 								else
 									ast_log(LOG_WARNING, "Label missing trailing ')' at line %d\n", v->lineno);
 							}
+							plus = strchr(pri, '+');
+							if (plus) {
+								*plus = '\0';
+								plus++;
+							}
 							if (!strcmp(pri,"hint"))
 								ipri=PRIORITY_HINT;
 							else if (!strcmp(pri, "next") || !strcmp(pri, "n")) {
@@ -1680,7 +1686,7 @@ static int pbx_load_module(void)
 									ipri = lastpri;
 								else
 									ast_log(LOG_WARNING, "Can't use 'same' priority on the first entry!\n");
-							} else {
+							} else  {
 								if (sscanf(pri, "%i", &ipri) != 1) {
 									ast_log(LOG_WARNING, "Invalid priority '%s' at line %d\n", pri, v->lineno);
 									ipri = 0;
@@ -1722,6 +1728,8 @@ static int pbx_load_module(void)
 							while(*appl && (*appl < 33)) appl++;
 							pbx_substitute_variables_helper(NULL, ext, realext, sizeof(realext) - 1);
 							if (ipri) {
+								if (plus)
+									ipri += atoi(plus);
 								lastpri = ipri;
 								if (ast_add_extension2(con, 0, realext, ipri, label, cidmatch, appl, strdup(data), FREE, registrar)) {
 									ast_log(LOG_WARNING, "Unable to register extension at line %d\n", v->lineno);