Index: trunk/BNC/src/t_prn.cpp
===================================================================
--- trunk/BNC/src/t_prn.cpp	(revision 5741)
+++ trunk/BNC/src/t_prn.cpp	(revision 5741)
@@ -0,0 +1,102 @@
+#include <sstream>
+#include <iomanip>
+#include <stdlib.h>
+
+#include "t_prn.h"
+
+using namespace BNC;
+using namespace std;
+
+// 
+//////////////////////////////////////////////////////////////////////////////
+int t_prn::toInt() const {
+  if      (_system == 'G') {
+    return _number;
+  }
+  else if (_system == 'R') {
+    return MAXPRN_GPS + _number;
+  }
+  return 0;
+}
+
+// 
+//////////////////////////////////////////////////////////////////////////////
+string t_prn::toString() const {
+  stringstream ss;
+  ss << _system << setfill('0') << setw(2) << _number;
+  return ss.str();
+}
+
+// Set from string
+////////////////////////////////////////////////////////////////////////////
+void t_prn::setValue(const std::string& str) {
+  unsigned    prn    = 0;
+  char        system = '\x0';
+  const char* number = 0;
+  if      ( str[0] == 'G' || str[0] == 'R') {
+    system = str[0];
+    number = str.c_str() + 1;
+  }
+  else if ( isdigit(str[0]) ) {
+    system = 'G';
+    number = str.c_str();
+  }
+  else {
+    throw "t_prn::setValue: wrong satellite ID: " + str;
+  }
+
+  char* tmpc = 0;
+  prn = strtol(number, &tmpc, 10);
+  if ( tmpc == number || *tmpc != '\x0' ) {
+    throw "t_prn::setValue: wrong satellite ID: " + str;
+  }
+
+  try {
+    this->setValue(system, prn);
+  }
+  catch (string exc) {
+    throw "t_prn::setValue: wrong satellite ID: " + str;
+  }
+}
+
+void t_prn::setValue(char system, unsigned prn) {
+  _system = system;
+  _number = prn;
+  int maxprn = 0;
+  switch (system) {
+  case 'G': 
+    maxprn = MAXPRN_GPS;     
+    break;
+  case 'R': 
+    maxprn = MAXPRN_GLONASS;    
+    break;
+  default: 
+    throw "t_prn::setValue: wrong satellite system identifier"; 
+    break;
+  }
+  if (_number > maxprn) {
+    ostringstream msg;
+    msg << "wrong satellite ID, system ID: " << system << " number: " << prn;
+    throw "t_prn::setValue: " + msg.str();
+  }
+}
+
+// 
+//////////////////////////////////////////////////////////////////////////////
+t_prn::operator unsigned() const {
+  return toInt();
+}
+
+// 
+//////////////////////////////////////////////////////////////////////////////
+istream& GPSS::operator >> (istream& in, t_prn& prn) {
+  string str;
+  in >> str;
+  if (str.length() == 1 && !isdigit(str[0])) {
+    string str2;
+    in >> str2;
+    str += str2;
+  }
+  prn.setValue(str);
+  return in;
+}
Index: trunk/BNC/src/t_prn.h
===================================================================
--- trunk/BNC/src/t_prn.h	(revision 5741)
+++ trunk/BNC/src/t_prn.h	(revision 5741)
@@ -0,0 +1,46 @@
+#ifndef PRN_H
+#define PRN_H
+
+#include <string>
+
+class t_prn {
+ public:
+  static const unsigned MAXPRN_GPS     = 32;
+  static const unsigned MAXPRN_GLONASS = 26;
+  static const unsigned MAXPRN         = MAXPRN_GPS + MAXPRN_GLONASS;
+
+  t_prn() : _system('G'), _number(0) {}
+  t_prn(char system, int number) : _system(system), _number(number) {}
+
+  ~t_prn() {}; 
+
+  void        set(char system, int number) {_system = system; _number = number;} 
+
+  char        system() const {return _system;}
+  int         number() const {return _number;}
+  int         toInt() const;
+  std::string toString() const;
+
+  bool operator==(const t_prn& prn2) const {
+    if (_system == prn2._system && _number == prn2._number) {
+      return true;
+    }
+    else {
+      return false;
+    }
+  }
+
+  operator unsigned() const;
+
+  friend std::istream& operator >> (std::istream& in, t_prn& prn);
+
+ private:
+  void setValue(const std::string& str);
+  void setValue(char system, unsigned prn);
+  char _system;
+  int  _number;
+};
+
+std::istream& operator >> (std::istream& in, t_prn& prn);
+
+#endif