From 4df8a8de850da14aaadad596709bf9b2506748ea Mon Sep 17 00:00:00 2001
From: "A. Jesse Jiryu Davis" <jesse@mongodb.com>
Date: Sat, 14 Nov 2015 22:36:12 -0500
Subject: [PATCH] CDRIVER-995 config check for _set_output_format, timespec

---
 CMakeLists.txt                      | 27 ++++++++++++++++++---------
 build/autotools/FindDependencies.m4 |  8 ++++++++
 src/bson/bson-config.h.in           | 17 +++++++++++++++++
 src/bson/bson.c                     |  9 ++-------
 tests/TestSuite.c                   |  2 +-
 5 files changed, 46 insertions(+), 17 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 70c2f35d..2bb4a5ea 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,6 +4,8 @@ project (libbson)
 
 include(CheckFunctionExists)
 include(CheckIncludeFile)
+include(CheckStructHasMember)
+include(CheckSymbolExists)
 include(TestBigEndian)
 include(InstallRequiredSystemLibraries)
 
@@ -34,14 +36,25 @@ if (RT_LIBRARY)
    set(CMAKE_REQUIRED_LIBRARIES ${RT_LIBRARY})
 endif()
 
+# See https://public.kitware.com/Bug/view.php?id=15659
+CHECK_SYMBOL_EXISTS(snprintf stdio.h BSON_HAVE_SNPRINTF)
+if (NOT BSON_HAVE_SNPRINTF)
+  set(BSON_HAVE_SNPRINTF 0)
+endif ()
+
+CHECK_FUNCTION_EXISTS(_set_output_format BSON_NEEDS_SET_OUTPUT_FORMAT)
+if (NOT BSON_NEEDS_SET_OUTPUT_FORMAT)
+  set(BSON_NEEDS_SET_OUTPUT_FORMAT 0)
+endif ()
+
+CHECK_STRUCT_HAS_MEMBER("struct timespec" tv_sec time.h BSON_HAVE_TIMESPEC)
+if (NOT BSON_HAVE_TIMESPEC)
+  set(BSON_HAVE_TIMESPEC 0)
+endif ()
+
 if (MSVC)
    set (BSON_OS 2)
    set (BSON_HAVE_CLOCK_GETTIME 0)
-   if (MSVC14)
-       set (BSON_HAVE_SNPRINTF 1)
-   else()
-       set (BSON_HAVE_SNPRINTF 0)
-   endif()
    set (BSON_HAVE_STDBOOL_H 0)
    set (BSON_HAVE_STRNLEN 0)
    set (BSON_EXTRA_ALIGN 1)
@@ -57,10 +70,6 @@ else ()
    if (NOT BSON_HAVE_STRNLEN)
       set(BSON_HAVE_STRNLEN 0)
    endif ()
-   CHECK_FUNCTION_EXISTS(snprintf BSON_HAVE_SNPRINTF)
-   if (NOT BSON_HAVE_SNPRINTF)
-      set(BSON_HAVE_SNPRINTF 0)
-   endif ()
    CHECK_INCLUDE_FILE(stdbool.h BSON_HAVE_STDBOOL_H)
    if (NOT BSON_HAVE_STDBOOL_H)
       set(BSON_HAVE_STDBOOL_H 0)
diff --git a/build/autotools/FindDependencies.m4 b/build/autotools/FindDependencies.m4
index 05dc514f..680796a6 100644
--- a/build/autotools/FindDependencies.m4
+++ b/build/autotools/FindDependencies.m4
@@ -6,6 +6,14 @@ AC_CHECK_FUNC(strnlen, [AC_SUBST(BSON_HAVE_STRNLEN, 1)])
 AC_SUBST(BSON_HAVE_SNPRINTF, 0)
 AC_CHECK_FUNC(snprintf, [AC_SUBST(BSON_HAVE_SNPRINTF, 1)])
 
+# Check for _set_output_format (unlikely, only Visual Studio 2013 and older)
+AC_SUBST(BSON_NEEDS_SET_OUTPUT_FORMAT, 0)
+AC_CHECK_FUNCS(_set_output_format, [AC_SUBST(BSON_NEEDS_SET_OUTPUT_FORMAT, 1)])
+
+# Check for struct timespec
+AC_SUBST(BSON_HAVE_TIMESPEC, 0)
+AC_CHECK_TYPES([struct timespec], [AC_SUBST(BSON_HAVE_TIMESPEC, 1)])
+
 # Check for clock_gettime and if it needs -lrt
 AC_SUBST(BSON_HAVE_CLOCK_GETTIME, 0)
 AC_SEARCH_LIBS([clock_gettime], [rt], [AC_SUBST(BSON_HAVE_CLOCK_GETTIME, 1)])
diff --git a/src/bson/bson-config.h.in b/src/bson/bson-config.h.in
index 12efb0ab..82bab2c7 100644
--- a/src/bson/bson-config.h.in
+++ b/src/bson/bson-config.h.in
@@ -79,6 +79,23 @@
 #endif
 
 
+/*
+ * Define to 1 if you have _set_output_format (VS2013 and older).
+ */
+#define BSON_NEEDS_SET_OUTPUT_FORMAT @BSON_NEEDS_SET_OUTPUT_FORMAT@
+#if BSON_NEEDS_SET_OUTPUT_FORMAT != 1
+# undef BSON_NEEDS_SET_OUTPUT_FORMAT
+#endif
+
+/*
+ * Define to 1 if you have struct timespec available on your platform.
+ */
+#define BSON_HAVE_TIMESPEC @BSON_HAVE_TIMESPEC@
+#if BSON_HAVE_TIMESPEC != 1
+# undef BSON_HAVE_TIMESPEC
+#endif
+
+
 /*
  * Define to 1 if you want extra aligned types in libbson
  */
diff --git a/src/bson/bson.c b/src/bson/bson.c
index cfad21a8..af5043f5 100644
--- a/src/bson/bson.c
+++ b/src/bson/bson.c
@@ -15,11 +15,6 @@
  */
 
 
-#if defined(_MSC_VER) && (_MSC_VER >= 1400 && _MSC_VER < 1900)
-#define NEEDS_SET_TWO_DIGIT_EXPONENT
-#include <stdio.h> // _set_output_format and _TWO_DIGIT_EXPONENT Added in vs2005 and removed in vs2015.
-#endif
-
 #include "bson.h"
 #include "b64_ntop.h"
 #include "bson-private.h"
@@ -2336,13 +2331,13 @@ _bson_as_json_visit_double (const bson_iter_t *iter,
 {
    bson_json_state_t *state = data;
 
-#ifdef NEEDS_SET_TWO_DIGIT_EXPONENT
+#if BSON_NEEDS_SET_OUTPUT_FORMAT
    unsigned int current_format = _set_output_format(_TWO_DIGIT_EXPONENT);
 #endif
 
    bson_string_append_printf (state->str, "%.15g", v_double);
 
-#ifdef NEEDS_SET_TWO_DIGIT_EXPONENT
+#if BSON_NEEDS_SET_OUTPUT_FORMAT
    _set_output_format(current_format);
 #endif
 
diff --git a/tests/TestSuite.c b/tests/TestSuite.c
index e87ca270..dd5edec8 100644
--- a/tests/TestSuite.c
+++ b/tests/TestSuite.c
@@ -85,7 +85,7 @@
 # define AtomicInt_DecrementAndTest(p) (bson_atomic_int_add(p, -1) == 0)
 
 
-#if defined(_MSC_VER) && _MSC_VER < 1900
+#if !defined(BSON_HAVE_TIMESPEC)
 struct timespec
 {
    time_t tv_sec;