diff options
| -rwxr-xr-x | doc/README.variables | 30 | ||||
| -rwxr-xr-x | pbx.c | 48 |
2 files changed, 57 insertions, 21 deletions
diff --git a/doc/README.variables b/doc/README.variables index e4c5d7d40..fb9e6f913 100755 --- a/doc/README.variables +++ b/doc/README.variables @@ -56,8 +56,8 @@ requires a variable), just write the name. To refer to the variable's value, enclose it inside ${}. For example, SetVar takes as the first argument (before the =) a variable name, so: -;exten => 1,2,SetVar(koko=lala) -;exten => 1,3,SetVar(${koko}=blabla) + exten => 1,2,SetVar(koko=lala) + exten => 1,3,SetVar(${koko}=blabla) stores to the variable "koko" the value "lala" and to variable "lala" the value "blabla". @@ -65,6 +65,32 @@ value "blabla". In fact, everything contained ${here} is just replaced with the value of the variable "here". +_______________________________ +REMOVING CHARACTERS FROM STRING +------------------------------- + +If you want to remove the first N characters from a string, you just +add a colon and the number of characters, like + + ;Remove the first character of extension, save in "number" variable + exten => _9X.,1,setvar(number=${EXTEN:1}) + +A second colon limits the number of characters used from the original +string. + ;Strip five characters from the start of string, use only two + ; (character 6 and 7 in the original string) + exten => 1000,4,setvar(skrep=${STRING:5:2}) + +You can also count from the end of the string by giving a negative +position: + + ;Use the two first of the three last characters in the account code + exten => 4500,4,setvar(acc=${ACCOUNTCODE:-3:2}) + +Or + ;Use the last three digits of the phone number + exten => 6112,4,goto(${EXTEN:-3},1) + ___________________________ EXPRESSIONS: --------------------------- @@ -805,6 +805,9 @@ static struct ast_exten *pbx_find_extension(struct ast_channel *chan, struct ast return NULL; } +/*--- pbx_retrieve_variable: Support for Asterisk built-in variables and + functions in the dialplan + ---*/ void pbx_retrieve_variable(struct ast_channel *c, const char *var, char **ret, char *workspace, int workspacelen, struct varshead *headp) { char *first,*second; @@ -818,7 +821,7 @@ void pbx_retrieve_variable(struct ast_channel *c, const char *var, char **ret, c headp=&c->varshead; *ret=NULL; /* Now we have the variable name on cp3 */ - if (!strncasecmp(var,"LEN(",4)) { + if (!strncasecmp(var,"LEN(",4)) { /* ${LEN(<string>)} */ int len=strlen(var); int len_len=4; if (strrchr(var,')')) { @@ -831,42 +834,49 @@ void pbx_retrieve_variable(struct ast_channel *c, const char *var, char **ret, c /* length is zero */ *ret = "0"; } - } else if ((first=strchr(var,':'))) { + } else if ((first=strchr(var,':'))) { /* : Remove characters counting from end or start of string */ strncpy(tmpvar, var, sizeof(tmpvar) - 1); first = strchr(tmpvar, ':'); if (!first) first = tmpvar + strlen(tmpvar); *first='\0'; pbx_retrieve_variable(c,tmpvar,ret,workspace,workspacelen - 1, headp); - if (!(*ret)) return; - offset=atoi(first+1); - if ((second=strchr(first+1,':'))) { + if (!(*ret)) + return; + offset=atoi(first+1); /* The number of characters, + positive: remove # of chars from start + negative: keep # of chars from end */ + + if ((second=strchr(first+1,':'))) { *second='\0'; - offset2=atoi(second+1); - } else - offset2=strlen(*ret)-offset; - if (abs(offset)>strlen(*ret)) { - if (offset>=0) + offset2 = atoi(second+1); /* Number of chars to copy */ + } else if (offset >= 0) { + offset2 = strlen(*ret)-offset; /* Rest of string */ + } else { + offset2 = abs(offset); + } + + if (abs(offset) > strlen(*ret)) { /* Offset beyond string */ + if (offset >= 0) offset=strlen(*ret); else - offset=-strlen(*ret); + offset=-strlen(*ret); } - if ((offset<0 && offset2>-offset) || (offset>=0 && offset+offset2>strlen(*ret))) { - if (offset>=0) + if ((offset < 0 && offset2 > -offset) || (offset >= 0 && offset+offset2 > strlen(*ret))) { + if (offset >= 0) offset2=strlen(*ret)-offset; else offset2=strlen(*ret)+offset; } - if (offset>=0) - *ret+=offset; + if (offset >= 0) + *ret += offset; else - *ret+=strlen(*ret)+offset; - (*ret)[offset2] = '\0'; + *ret += strlen(*ret)+offset; + (*ret)[offset2] = '\0'; /* Cut at offset2 position */ } else if (c && !strncmp(var, "CALL", 4)) { if (!strncmp(var + 4, "ER", 2)) { if (!strncmp(var + 6, "ID", 2)) { - if (!var[8]) { - /* CALLERID */ + if (!var[8]) { /* CALLERID */ if (c->cid.cid_num) { if (c->cid.cid_name) { snprintf(workspace, workspacelen, "\"%s\" <%s>", c->cid.cid_name, c->cid.cid_num); |