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, 9 insertions, 5 deletions

diff --git a/src/projections/cea.cpp b/src/projections/cea.cpp
index b7874b90..0d850b49 100644
--- a/src/projections/cea.cpp
+++ b/src/projections/cea.cpp
@@ -53,7 +53,7 @@ static PJ_LP cea_s_inverse (PJ_XY xy, PJ *P) {           /* Spheroidal, inverse
             lp.phi = asin(xy.y);
         lp.lam = xy.x / P->k0;
     } else {
-        proj_errno_set(P, PJD_ERR_TOLERANCE_CONDITION);
+        proj_errno_set(P, PROJ_ERR_COORD_TRANSFM_OUTSIDE_PROJECTION_DOMAIN);
         return lp;
     }
     return (lp);
@@ -75,15 +75,19 @@ PJ *PROJECTION(cea) {
     double t = 0.0;
     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;
     P->destructor = destructor;
 
 
     if (pj_param(P->ctx, P->params, "tlat_ts").i) {
-        P->k0 = cos(t = pj_param(P->ctx, P->params, "rlat_ts").f);
+        t = pj_param(P->ctx, P->params, "rlat_ts").f;
+        P->k0 = cos(t);
         if (P->k0 < 0.)
-            return pj_default_destructor (P, PJD_ERR_LAT_TS_LARGER_THAN_90);
+        {
+            proj_log_error(P, _("Invalid value for lat_ts: |lat_ts| should be <= 90°"));
+            return pj_default_destructor(P, PROJ_ERR_INVALID_OP_ILLEGAL_ARG_VALUE);
+        }
     }
     if (P->es != 0.0) {
         t = sin(t);
@@ -91,7 +95,7 @@ PJ *PROJECTION(cea) {
         P->e = sqrt(P->es);
         Q->apa = pj_authset(P->es);
         if (!(Q->apa))
-            return pj_default_destructor(P, ENOMEM);
+            return pj_default_destructor(P, PROJ_ERR_INVALID_OP /*ENOMEM*/);
 
         Q->qp = pj_qsfn(1., P->e, P->one_es);
         P->inv = cea_e_inverse;