From 4c2dd6e0ea9b3dcf1cbf5bd176e6044017288584 Mon Sep 17 00:00:00 2001
From: oliskoli <oliskoli>
Date: Fri, 4 May 2007 20:02:05 +0000
Subject: [PATCH] xcsv: Add support for BNG (British National Grid)
 coordinates.

---
 csv_util.c                 | 16 +++++++++++++++-
 xmldoc/chapters/styles.xml | 18 ++++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/csv_util.c b/csv_util.c
index a1a7edf87..047a453dd 100644
--- a/csv_util.c
+++ b/csv_util.c
@@ -881,7 +881,11 @@ xcsv_parse_val(const char *s, waypoint *wpt, const field_map_t *fmp)
     if (strcmp(fmp->key, "LON_DIR") == 0) {
        /* longitude E/W. Ingore on input for now */
     } else
-
+    /* SPECIAL COORDINATES/GRID */
+    if (strcmp(fmp->key, "MAP_EN_BNG") == 0) {
+       parse_coordinates(s, DATUM_OSGB36, grid_bng,
+          &wpt->latitude, &wpt->longitude, MYNAME);
+    } else
     /* ALTITUDE CONVERSIONS ************************************************/
     if (strcmp(fmp->key, "ALT_FEET") == 0) {
        /* altitude in feet as a decimal value */
@@ -1348,6 +1352,16 @@ xcsv_waypt_pr(const waypoint *wpt)
             writebuff(buff, fmp->printfc,
               LON_DIR(lon));
         } else
+	
+	/* SPECIAL COORDINATES */
+        if (strcmp(fmp->key, "MAP_EN_BNG") == 0) {
+		char map[3];
+		double north, east;
+		if (! GPS_Math_WGS84_To_UKOSMap_M(wpt->latitude, wpt->longitude, &east, &north, map))
+			fatal(MYNAME ": Position (%.5f/%.5f) outside of BNG.\n",
+				wpt->latitude, wpt->longitude);
+		snprintf(buff, sizeof(buff), fmp->printfc, map, (int)(east + 0.5), (int)(north + 0.5));
+	} else
 
         /* ALTITUDE CONVERSIONS**********************************************/
         if (strcmp(fmp->key, "ALT_FEET") == 0) {
diff --git a/xmldoc/chapters/styles.xml b/xmldoc/chapters/styles.xml
index 3f64a1d10..4bd2f3835 100644
--- a/xmldoc/chapters/styles.xml
+++ b/xmldoc/chapters/styles.xml
@@ -646,6 +646,24 @@ examples:
 </screen>
 </section>
 
+<section id="style_def_map_en_bng">
+<title>MAP_EN_BNG</title>
+<para>
+   MAP_EN_BNG converts coordinates from/to British National Grid (BNG).
+</para>
+<para>
+   The only supported order of the items is: Map,Easting,Northing.
+   During output all coordinates have to be located within this limited area.
+</para>
+<para>
+examples:
+</para>
+<screen format="linespecific">
+   IFIELD MAP_EN_BNG,"","%s%5d %5d"   #  (writes i.e. "SJ00001 00001")
+   IFIELD MAP_EN_BNG,"","%s %d %d"    #  (writes i.e. "TQ 888 999")
+</screen>
+</section>
+
 <section id="style_def_lonhuman">
 <title>LON_HUMAN_READABLE</title>
 <para>
-- 
2.30.2