Add proj_errno_string() to proj.def

src/proj.def

@@ -157,3 +157,5 @@ EXPORTS
     proj_context_errno             @141
 
     pj_isnan                       @142
+
+    proj_errno_string              @143

test/unit/CMakeLists.txt

@@ -58,6 +58,15 @@ target_link_libraries(proj_test_unit
   ${PROJ_LIBRARIES})
 add_test(NAME proj_test_unit COMMAND proj_test_unit)
 
+add_executable(proj_errno_string_test
+  main.cpp
+  proj_errno_string_test.cpp)
+target_link_libraries(proj_errno_string_test
+  gtest
+  ${PROJ_LIBRARIES})
+add_test(NAME proj_errno_string_test COMMAND proj_errno_string_test)
+
+
 if (MSVC AND BUILD_LIBPROJ_SHARED)
 # ph_phi2_test not compatible of a .dll build
 else()

test/unit/Makefile.am

@@ -9,6 +9,7 @@ AM_CXXFLAGS = @CXX_WFLAGS@ @NO_ZERO_AS_NULL_POINTER_CONSTANT_FLAG@
 
 bin_PROGRAMS = basic_test
 bin_PROGRAMS += pj_phi2_test
+bin_PROGRAMS += proj_errno_string_test
 
 basic_test_SOURCES = basic_test.cpp main.cpp
 basic_test_LDADD = ../../src/libproj.la ../../test/googletest/libgtest.la
@@ -22,5 +23,11 @@ pj_phi2_test_LDADD = ../../src/libproj.la ../../test/googletest/libgtest.la
 pj_phi2_test-check: pj_phi2_test
 	./pj_phi2_test
 
+proj_errno_string_test_SOURCES = proj_errno_string_test.cpp main.cpp
+proj_errno_string_test_LDADD= ../../src/libproj.la ../../test/googletest/libgtest.la
+
+proj_errno_string_test-check: proj_errno_string_test
+	./proj_errno_string_test
+
 check-local: basic_test-check
-check-local: pj_phi2_test-check
+check-local: pj_phi2_test-check proj_errno_string_test-check

test/unit/proj_errno_string_test.cpp

@@ -0,0 +1,68 @@
+/******************************************************************************
+ *
+ * Project:  PROJ
+ * Purpose:  Unit test for proj_errno_string()
+ * Author:   Kristian Evers <kristianevers@gmail.com>
+ *
+ ******************************************************************************
+ * Copyright (c) 2018, Kristian Evers.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ ****************************************************************************/
+
+#include <cstring>
+
+#include "proj.h"
+
+#include "gtest_include.h"
+
+namespace {
+
+TEST(ProjErrnoStringTest, NoError) {
+    EXPECT_EQ(0, proj_errno_string(0));
+}
+
+TEST(ProjErrnoStringTest, ProjErrnos) {
+    EXPECT_STREQ("no arguments in initialization list", proj_errno_string(-1));
+    EXPECT_STREQ("invalid projection system error (-1000)", proj_errno_string(-1000));
+    EXPECT_STREQ("invalid projection system error (-9999)", proj_errno_string(-9999));
+    // for errnos < -9999, -9999 is always returned
+    constexpr int min = std::numeric_limits<int>::min();
+    EXPECT_STREQ("invalid projection system error (-9999)",proj_errno_string(min));
+    EXPECT_STREQ("invalid projection system error (-9999)", proj_errno_string(-10000));
+}
+
+TEST(ProjErrnoStringTest, SystemErrnos) {
+    constexpr int max = std::numeric_limits<int>::max();
+
+#ifdef HAVE_STRERROR
+    EXPECT_STREQ(strerror(5), proj_errno_string(5));
+    EXPECT_STREQ(strerror(9999), proj_errno_string(9999));
+    EXPECT_STREQ(strerror(10000), proj_errno_string(10000));
+    EXPECT_STREQ(strerror(max), proj_errno_string(max));
+#else
+    EXPECT_STREQ("no system list, errno: 5\n", proj_errno_string(5));
+    EXPECT_STREQ("no system list, errno: 9999\n", proj_errno_string(9999));
+    // for errnos > 9999, 9999 is always returned
+    EXPECT_STREQ("no system list, errno: 9999\n", proj_errno_string(10000));
+    EXPECT_STREQ("no system list, errno: 9999\n", proj_errno_string(max));
+#endif
+}
+
+}  // namespace