From c68949fa7aefd536f4054a729ca136259e1c2ab9 Mon Sep 17 00:00:00 2001
From: Frank Warmerdam <warmerdam@pobox.com>
Date: Wed, 26 Mar 2003 16:52:30 +0000
Subject: added check that an inverse transformation func exists

git-svn-id: http://svn.osgeo.org/metacrs/proj/trunk@1121 4e78687f-474d-0410-85f9-8d5e500ac6b2
---
 src/pj_transform.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'src')

diff --git a/src/pj_transform.c b/src/pj_transform.c
index 0e649bae..a7dcb2f4 100644
--- a/src/pj_transform.c
+++ b/src/pj_transform.c
@@ -30,6 +30,9 @@
  ******************************************************************************
  *
  * $Log$
+ * Revision 1.9  2003/03/26 16:52:30  warmerda
+ * added check that an inverse transformation func exists
+ *
  * Revision 1.8  2002/12/14 20:35:43  warmerda
  * implement units support for geocentric coordinates
  *
@@ -129,6 +132,17 @@ int pj_transform( PJ *srcdefn, PJ *dstdefn, long point_count, int point_offset,
 /* -------------------------------------------------------------------- */
     else if( !srcdefn->is_latlong )
     {
+        if( srcdefn->inv == NULL )
+        {
+            pj_errno = -17; /* this isn't correct, we need a no inverse err */
+            if( getenv( "PROJ_DEBUG" ) != NULL )
+            {
+                fprintf( stderr, 
+                       "pj_transform(): source projection not invertable\n" );
+            }
+            return pj_errno;
+        }
+
         for( i = 0; i < point_count; i++ )
         {
             XY         projected_loc;
-- 
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