pv: new transformation {s.stripto,c}

- remove the prefix until meeting 'c'
- "abcdef"{s.stripto,d} => "def"
- the char can be given in a pv

modules_k/pv/pv_trans.c

@@ -487,6 +487,47 @@ int tr_eval_string(struct sip_msg *msg, tr_param_t *tp, int subtype,
 			val->rs.len -= i;
 			break;
 
+
+		case TR_S_STRIPTO:
+			if(tp==NULL)
+			{
+				LM_ERR("stripto invalid parameters\n");
+				return -1;
+			}
+			if(!(val->flags&PV_VAL_STR))
+				val->rs.s = int2str(val->ri, &val->rs.len);
+
+			if(tp->type==TR_PARAM_STRING)
+			{
+				st = tp->v.s;
+			} else {
+				if(pv_get_spec_value(msg, (pv_spec_p)tp->v.data, &v)!=0
+						|| (!(v.flags&PV_VAL_STR)) || v.rs.len<=0)
+				{
+					LM_ERR("stripto cannot get p1\n");
+					return -1;
+				}
+				st = v.rs;
+			}
+
+			val->flags = PV_VAL_STR;
+			val->ri = 0;
+			for(i=0; i<val->rs.len; i++)
+			{
+				if(val->rs.s[i] == st.s[0])
+					break;
+			}
+			if(i>=val->rs.len)
+			{
+				_tr_buffer[0] = '\0';
+				val->rs.s = _tr_buffer;
+				val->rs.len = 0;
+				break;
+			}
+			val->rs.s += i;
+			val->rs.len -= i;
+			break;
+
 		case TR_S_PREFIXES:
 		case TR_S_PREFIXES_QUOT:
 			if(!(val->flags&PV_VAL_STR))
@@ -1874,6 +1915,26 @@ char* tr_parse_string(str* in, trans_t *t)
 			goto error;
 		}
 		goto done;
+	} else if(name.len==7 && strncasecmp(name.s, "stripto", 7)==0) {
+		t->subtype = TR_S_STRIPTO;
+		if(*p!=TR_PARAM_MARKER)
+		{
+			LM_ERR("invalid stripto transformation: %.*s!\n",
+					in->len, in->s);
+			goto error;
+		}
+		p++;
+		_tr_parse_sparam(p, p0, tp, spec, ps, in, s);
+		t->params = tp;
+		tp = 0;
+		while(*p && (*p==' ' || *p=='\t' || *p=='\n')) p++;
+		if(*p!=TR_RBRACKET)
+		{
+			LM_ERR("invalid strip transformation: %.*s!!\n",
+				in->len, in->s);
+			goto error;
+		}
+		goto done;
 	} else if(name.len==5 && strncasecmp(name.s, "ftime", 5)==0) {
 		t->subtype = TR_S_TIMEFORMAT;
 		if(*p!=TR_PARAM_MARKER)

modules_k/pv/pv_trans.h

@@ -40,7 +40,7 @@ enum _tr_s_subtype {
 	TR_S_ESCAPECOMMON, TR_S_UNESCAPECOMMON, TR_S_ESCAPEUSER, TR_S_UNESCAPEUSER,
 	TR_S_ESCAPEPARAM, TR_S_UNESCAPEPARAM, TR_S_TOLOWER, TR_S_TOUPPER,
 	TR_S_STRIP, TR_S_STRIPTAIL, TR_S_PREFIXES, TR_S_PREFIXES_QUOT, TR_S_REPLACE,
-	TR_S_TIMEFORMAT, TR_S_TRIM, TR_S_RTRIM, TR_S_LTRIM, TR_S_RM
+	TR_S_TIMEFORMAT, TR_S_TRIM, TR_S_RTRIM, TR_S_LTRIM, TR_S_RM, TR_S_STRIPTO
 };
 enum _tr_uri_subtype {
 	TR_URI_NONE=0, TR_URI_USER, TR_URI_HOST, TR_URI_PASSWD, TR_URI_PORT,