From 53ef55410c7d5532151e9fba1ac5ab8eda553715 Mon Sep 17 00:00:00 2001
From: Klaus Schmidinger <vdr@tvdr.de>
Date: Thu, 11 Apr 2013 10:40:47 +0200
Subject: [PATCH] Changed the sign of the satellite position value in cSource
 to reflect the standard of western values being negative

---
 HISTORY   |  3 +++
 sources.c | 23 ++++++++++++++---------
 sources.h |  9 ++++++++-
 3 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/HISTORY b/HISTORY
index 7a048cce..06e0b605 100644
--- a/HISTORY
+++ b/HISTORY
@@ -7809,3 +7809,6 @@ Video Disk Recorder Revision History
   Dolze).
 - Fixed handling '/' and '~' in recording file names in case DirectoryEncoding is
   used (thanks to Lars Hanisch).
+- Changed the sign of the satellite position value in cSource to reflect the standard
+  of western values being negative. The new member function cSource::Position() can be
+  used to retrieve the orbital position of a satellite.
diff --git a/sources.c b/sources.c
index f39318a6..94df64c6 100644
--- a/sources.c
+++ b/sources.c
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: sources.c 3.1 2013/04/09 11:10:30 kls Exp $
+ * $Id: sources.c 3.2 2013/04/11 10:24:05 kls Exp $
  */
 
 #include "sources.h"
@@ -37,17 +37,22 @@ bool cSource::Parse(const char *s)
   return code != stNone && description && *description;
 }
 
+int cSource::Position(int Code)
+{
+  int n = (Code & st_Pos);
+  if (n > 0x00007FFF)
+     n |= 0xFFFF0000;
+  return n;
+}
+
 cString cSource::ToString(int Code)
 {
   char buffer[16];
   char *q = buffer;
   *q++ = (Code & st_Mask) >> 24;
-  int n = (Code & st_Pos);
-  if (n > 0x00007FFF)
-     n |= 0xFFFF0000;
-  if (n) {
+  if (int n = Position(Code)) {
      q += snprintf(q, sizeof(buffer) - 2, "%u.%u", abs(n) / 10, abs(n) % 10); // can't simply use "%g" here since the silly 'locale' messes up the decimal point
-     *q++ = (n < 0) ? 'E' : 'W';
+     *q++ = (n < 0) ? 'W' : 'E';
      }
   *q = 0;
   return buffer;
@@ -69,8 +74,8 @@ int cSource::FromString(const char *s)
                                      break;
                    case '.':         dot = true;
                                      break;
-                   case 'E':         neg = true; // fall through to 'W'
-                   case 'W':         if (!dot)
+                   case 'W':         neg = true; // fall through to 'E'
+                   case 'E':         if (!dot)
                                         pos *= 10;
                                      break;
                    default: esyslog("ERROR: unknown source character '%c'", *s);
@@ -93,7 +98,7 @@ int cSource::FromData(eSourceType SourceType, int Position, bool East)
 {
   int code = SourceType;
   if (SourceType == stSat) {
-     if (East)
+     if (!East)
         Position = -Position;
      code |= (Position & st_Pos);
      }
diff --git a/sources.h b/sources.h
index 516a3edc..e40b2b1d 100644
--- a/sources.h
+++ b/sources.h
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: sources.h 2.4 2012/06/17 11:19:23 kls Exp $
+ * $Id: sources.h 3.1 2013/04/11 10:23:16 kls Exp $
  */
 
 #ifndef __SOURCES_H
@@ -31,8 +31,15 @@ public:
   cSource(char Source, const char *Description);
   ~cSource();
   int Code(void) const { return code; }
+  int Position(void) { return Position(code); }
+      ///< Returns the orbital position of the satellite in case this is a DVB-S
+      ///< source (zero otherwise). The returned value is in the range -1800...+1800.
+      ///< A positive sign indicates a position east of Greenwich, while western
+      ///< positions have a negative sign. The absolute value is in "degrees * 10",
+      ///< which allows for a resolution of 1/10 of a degree.
   const char *Description(void) const { return description; }
   bool Parse(const char *s);
+  static int Position(int Code);
   static char ToChar(int Code) { return (Code & st_Mask) >> 24; }
   static cString ToString(int Code);
   static int FromString(const char *s);