gdalinfo/ogrinfo text output: avoid weird truncation of coordinate epoch when its value is {year}.0

apps/gdalinfo_lib.cpp

@@ -639,10 +639,12 @@ char *GDALInfo(GDALDatasetH hDataset, const GDALInfoOptions *psOptions)
             {
                 std::string osCoordinateEpoch =
                     CPLSPrintf("%f", dfCoordinateEpoch);
-                if (osCoordinateEpoch.find('.') != std::string::npos)
+                const size_t nDotPos = osCoordinateEpoch.find('.');
+                if (nDotPos != std::string::npos)
                 {
-                    while (osCoordinateEpoch.back() == '0')
-                        osCoordinateEpoch.resize(osCoordinateEpoch.size() - 1);
+                    while (osCoordinateEpoch.size() > nDotPos + 2 &&
+                           osCoordinateEpoch.back() == '0')
+                        osCoordinateEpoch.pop_back();
                 }
                 Concat(osStr, psOptions->bStdoutOutput,
                        "Coordinate epoch: %s\n", osCoordinateEpoch.c_str());

apps/ogrinfo_lib.cpp

@@ -1191,10 +1191,12 @@ static void ReportOnLayer(CPLString &osRet, CPLJSONObject &oLayer,
             {
                 std::string osCoordinateEpoch =
                     CPLSPrintf("%f", dfCoordinateEpoch);
-                if (osCoordinateEpoch.find('.') != std::string::npos)
+                const size_t nDotPos = osCoordinateEpoch.find('.');
+                if (nDotPos != std::string::npos)
                 {
-                    while (osCoordinateEpoch.back() == '0')
-                        osCoordinateEpoch.resize(osCoordinateEpoch.size() - 1);
+                    while (osCoordinateEpoch.size() > nDotPos + 2 &&
+                           osCoordinateEpoch.back() == '0')
+                        osCoordinateEpoch.pop_back();
                 }
                 Concat(osRet, psOptions->bStdoutOutput,
                        "Coordinate epoch: %s\n", osCoordinateEpoch.c_str());

autotest/utilities/test_gdalinfo_lib.py

@@ -201,17 +201,18 @@ def test_gdalinfo_lib_nodatavalues():
 ###############################################################################
 
 
-def test_gdalinfo_lib_coordinate_epoch():
+@pytest.mark.parametrize("epoch", ["2021.0", "2021.3"])
+def test_gdalinfo_lib_coordinate_epoch(epoch):
 
     ds = gdal.Translate(
-        "", "../gcore/data/byte.tif", options='-of MEM -a_coord_epoch 2021.3"'
+        "", "../gcore/data/byte.tif", options=f'-of MEM -a_coord_epoch {epoch}"'
     )
     ret = gdal.Info(ds)
-    assert "Coordinate epoch: 2021.3" in ret
+    assert f"Coordinate epoch: {epoch}" in ret
 
     ret = gdal.Info(ds, format="json")
     assert "coordinateEpoch" in ret
-    assert ret["coordinateEpoch"] == 2021.3
+    assert ret["coordinateEpoch"] == float(epoch)
 
 
 ###############################################################################

autotest/utilities/test_ogrinfo_lib.py

@@ -33,7 +33,7 @@
 import gdaltest
 import pytest
 
-from osgeo import gdal, ogr
+from osgeo import gdal, ogr, osr
 
 ###############################################################################
 # Simple test
@@ -637,3 +637,24 @@ def test_ogrinfo_lib_layers():
 
     with pytest.raises(Exception, match="Couldn't fetch requested layer"):
         gdal.VectorInfo(ds, format="json", layers=["invalid"])
+
+
+###############################################################################
+
+
+@pytest.mark.parametrize("epoch", ["2021.0", "2021.3"])
+def test_ogrinfo_lib_coordinate_epoch(epoch):
+
+    ds = gdal.GetDriverByName("Memory").Create("dummy", 0, 0, 0, gdal.GDT_Unknown)
+    srs = osr.SpatialReference()
+    srs.ImportFromEPSG(4326)
+    srs.SetCoordinateEpoch(float(epoch))
+    ds.CreateLayer("foo", srs=srs)
+
+    ret = gdal.VectorInfo(ds)
+    assert f"Coordinate epoch: {epoch}" in ret
+
+    j = gdal.VectorInfo(ds, format="json")
+    crs = j["layers"][0]["geometryFields"][0]["coordinateSystem"]
+    assert "coordinateEpoch" in crs
+    assert crs["coordinateEpoch"] == float(epoch)