--- parser3/src/classes/math.C	2007/08/20 10:37:21	1.51
+++ parser3/src/classes/math.C	2008/06/16 09:37:47	1.52
@@ -8,7 +8,7 @@
 	Copyright (C) 1996, 1997, 1998, 1999 Theodore Ts'o.
 */
 
-static const char * const IDENT_MATH_C="$Date: 2007/08/20 10:37:21 $";
+static const char * const IDENT_MATH_C="$Date: 2008/06/16 09:37:47 $";
 
 #include "pa_vmethod_frame.h"
 #include "pa_common.h"
@@ -493,7 +493,7 @@ static void _crc32(Request& r, MethodPar
 
 static void _long2ip(Request& r, MethodParams& params) {
 	unsigned long l=(unsigned long)trunc(params.as_double(0, "parameter must be expression", r));
-	static const int ip_cstr_bufsize=15+1+1;
+	static const int ip_cstr_bufsize=3*4+3+1;
 	char* ip_cstr=new(PointerFreeGC) char[ip_cstr_bufsize];
 
 	snprintf(ip_cstr, ip_cstr_bufsize, "%d.%d.%d.%d",
@@ -505,6 +505,54 @@ static void _long2ip(Request& r, MethodP
 	r.write_no_lang(*new String(ip_cstr));
 }
 
+static void _ip2long(Request& r, MethodParams& params) {
+	const String ip=params.as_string(0, PARAMETER_MUST_BE_STRING);
+	if(ip.is_empty())
+		throw Exception(PARSER_RUNTIME,
+			0,
+			"IP address must not be empty.");
+
+	const char* ip_cstr=ip.cstr();
+	ulong result=0;
+	uint byte_value=0;
+	uint dot_cnt=0;
+	bool byte_start=true;
+	bool err=false;
+	const char* p=ip_cstr;
+	while(char c=*p++){
+		uint digit=(uint)(c-'0');	// assume ascii
+		if(digit>=0 && digit<=9){
+			byte_start=false;
+			if((byte_value=byte_value*10+digit) > 255){
+				err=true;
+				break;
+			}
+		} else if(c=='.'){
+			if(byte_start){ // two dots in row or IP started with dot
+				err=true;
+				break;
+			} else {
+				byte_start=true;
+				dot_cnt++;
+				result=(result << 8)+(ulong)byte_value;
+				byte_value=0;
+			}
+		} else { // invalid char
+			err=true;
+			break;
+		}
+	}
+
+	if(err || dot_cnt!=3 || byte_start){
+		throw Exception(PARSER_RUNTIME,
+			0,
+			"Invalid IP address '%s' specified.", ip_cstr);
+	} else {
+		result=(result << 8)+(ulong)byte_value;
+		r.write_no_lang(*new VDouble(result));
+	}
+}
+
 // constructor
 
 MMath::MMath(): Methoded("math") {
@@ -543,6 +591,7 @@ MMath::MMath(): Methoded("math") {
 	ADD1(crc32);
 
 	ADD1(long2ip);
+	ADD1(ip2long);
 
 	// ^math:uuid[]
 	ADD0(uuid);