Revise error codes to have a reduced set exposed in the public API.

Fixes #2482

And also add proj_context_errno_string()

Revise gie 'expect failure errno XXXX' strings

1 files changed, 2 insertions, 1 deletions

diff --git a/src/generic_inverse.cpp b/src/generic_inverse.cpp
index ddd5060b..41cf6c50 100644
--- a/src/generic_inverse.cpp
+++ b/src/generic_inverse.cpp
@@ -109,6 +109,7 @@ PJ_LP pj_generic_inverse_2d(PJ_XY xy, PJ *P, PJ_LP lpInitial) {
                 lp.phi = M_HALFPI;
         }
     }
-    proj_context_errno_set(P->ctx, PJD_ERR_NON_CONVERGENT);
+    proj_context_errno_set(P->ctx,
+                           PROJ_ERR_COORD_TRANSFM_OUTSIDE_PROJECTION_DOMAIN);
     return lp;
 }