Make sure that transient errors are returned correctly

The prepare/finalize steps in pj_fwd*/pj_inv* now checks the error level
of the PJ object before returning the coordinate. If an error is
detected proj_coord_error() is returned.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/pj_inv.c b/src/pj_inv.c
index 1e84ff30..f9f11f56 100644
--- a/src/pj_inv.c
+++ b/src/pj_inv.c
@@ -198,6 +198,12 @@ LP pj_inv(XY xy, PJ *P) {
 
     if (!P->skip_inv_finalize)
         coo = inv_finalize (P, coo);
+
+    if (proj_errno(P)) {
+        proj_errno_reset(P);
+        return proj_coord_error().lp;
+    }
+
     return coo.lp;
 }
 
@@ -228,6 +234,12 @@ LPZ pj_inv3d (XYZ xyz, PJ *P) {
 
     if (!P->skip_inv_finalize)
         coo = inv_finalize (P, coo);
+
+    if (proj_errno(P)) {
+        proj_errno_reset(P);
+        return proj_coord_error().lpz;
+    }
+
     return coo.lpz;
 }
 
@@ -255,5 +267,11 @@ PJ_COORD pj_inv4d (PJ_COORD coo, PJ *P) {
 
     if (!P->skip_inv_finalize)
         coo = inv_finalize (P, coo);
+
+    if (proj_errno(P)) {
+        proj_errno_reset(P);
+        return proj_coord_error();
+    }
+
     return coo;
 }