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, 5 insertions, 4 deletions

diff --git a/src/projections/lcca.cpp b/src/projections/lcca.cpp
index 53646fc6..6f962699 100644
--- a/src/projections/lcca.cpp
+++ b/src/projections/lcca.cpp
@@ -112,7 +112,7 @@ static PJ_LP lcca_e_inverse (PJ_XY xy, PJ *P) {          /* Ellipsoidal, inverse
         if (fabs(dif) < DEL_TOL) break;
     }
     if (!i) {
-        proj_errno_set(P, PJD_ERR_TOLERANCE_CONDITION);
+        proj_errno_set(P, PROJ_ERR_COORD_TRANSFM_OUTSIDE_PROJECTION_DOMAIN);
         return lp;
     }
     lp.phi = pj_inv_mlfn(P->ctx, S + Q->M0, P->es, Q->en);
@@ -137,15 +137,16 @@ PJ *PROJECTION(lcca) {
     double s2p0, N0, R0, tan0;
     struct pj_opaque *Q = static_cast<struct pj_opaque*>(calloc (1, sizeof (struct pj_opaque)));
     if (nullptr==Q)
-        return pj_default_destructor (P, ENOMEM);
+        return pj_default_destructor (P, PROJ_ERR_INVALID_OP /*ENOMEM*/);
     P->opaque = Q;
 
     (Q->en = pj_enfn(P->es));
     if (!Q->en)
-        return pj_default_destructor (P, ENOMEM);
+        return pj_default_destructor (P, PROJ_ERR_INVALID_OP /*ENOMEM*/);
 
     if (P->phi0 == 0.) {
-        return destructor(P, PJD_ERR_LAT_0_IS_ZERO);
+        proj_log_error(P, _("Invalid value for lat_0: it should be different from 0."));
+        return destructor(P, PROJ_ERR_INVALID_OP_ILLEGAL_ARG_VALUE);
     }
     Q->l = sin(P->phi0);
     Q->M0 = pj_mlfn(P->phi0, Q->l, cos(P->phi0), Q->en);