msvcrt: Implement _get_errno.

dlls/msvcr100/msvcr100.spec

@@ -679,7 +679,7 @@
 @ stub _get_daylight
 @ stub _get_doserrno
 @ stub _get_dstbias
-@ stub _get_errno
+@ cdecl _get_errno(ptr) msvcrt._get_errno
 @ stub _get_fmode
 @ cdecl _get_heap_handle() msvcrt._get_heap_handle
 @ cdecl _get_invalid_parameter_handler() msvcrt._get_invalid_parameter_handler

dlls/msvcr80/msvcr80.spec

@@ -521,7 +521,7 @@
 @ stub _get_daylight
 @ stub _get_doserrno
 @ stub _get_dstbias
-@ stub _get_errno
+@ cdecl _get_errno(ptr) msvcrt._get_errno
 @ stub _get_fmode
 @ cdecl _get_heap_handle() msvcrt._get_heap_handle
 @ cdecl _get_invalid_parameter_handler() msvcrt._get_invalid_parameter_handler

dlls/msvcr90/msvcr90.spec

@@ -513,7 +513,7 @@
 @ stub _get_daylight
 @ stub _get_doserrno
 @ stub _get_dstbias
-@ stub _get_errno
+@ cdecl _get_errno(ptr) msvcrt._get_errno
 @ stub _get_fmode
 @ cdecl _get_heap_handle() msvcrt._get_heap_handle
 @ cdecl _get_invalid_parameter_handler() msvcrt._get_invalid_parameter_handler

dlls/msvcrt/errno.c

@@ -203,6 +203,18 @@ MSVCRT_ulong* CDECL MSVCRT___doserrno(void)
     return &msvcrt_get_thread_data()->thread_doserrno;
 }
 
+/*********************************************************************
+ *		_get_errno (MSVCRT.@)
+ */
+int CDECL _get_errno(int *pValue)
+{
+    if (!pValue)
+        return MSVCRT_EINVAL;
+
+    *pValue = *MSVCRT__errno();
+    return 0;
+}
+
 /*********************************************************************
  *		strerror (MSVCRT.@)
  */

dlls/msvcrt/msvcrt.spec

@@ -464,7 +464,7 @@
 @ cdecl _gcvt_s(ptr long  double long)
 # stub _get_doserrno
 # stub _get_environ
-# stub _get_errno
+@ cdecl _get_errno(ptr)
 # stub _get_fileinfo
 # stub _get_fmode
 @ cdecl _get_heap_handle()

dlls/msvcrt/tests/misc.c

@@ -26,6 +26,7 @@ static int (__cdecl *prand_s)(unsigned int *);
 static int (__cdecl *pmemcpy_s)(void *, MSVCRT_size_t, void*, MSVCRT_size_t);
 static int (__cdecl *pI10_OUTPUT)(long double, int, int, void*);
 static int (__cdecl *pstrerror_s)(char *, MSVCRT_size_t, int);
+static int (__cdecl *p_get_errno)(int *);
 
 static void init(void)
 {
@@ -35,6 +36,7 @@ static void init(void)
     pmemcpy_s = (void*)GetProcAddress(hmod, "memcpy_s");
     pI10_OUTPUT = (void*)GetProcAddress(hmod, "$I10_OUTPUT");
     pstrerror_s = (void *)GetProcAddress(hmod, "strerror_s");
+    p_get_errno = (void *)GetProcAddress(hmod, "_get_errno");
 }
 
 static void test_rand_s(void)
@@ -241,6 +243,28 @@ static void test_strerror_s(void)
     ok(ret == 0, "Expected strerror_s to return 0, got %d\n", ret);
 }
 
+static void test__get_errno(void)
+{
+    int ret, out;
+
+    if (!p_get_errno)
+    {
+        win_skip("_get_errno is not available\n");
+        return;
+    }
+
+    errno = EBADF;
+    ret = p_get_errno(NULL);
+    ok(ret == EINVAL, "Expected _get_errno to return EINVAL, got %d\n", ret);
+    ok(errno == EBADF, "Expected errno to be EBADF, got %d\n", errno);
+
+    errno = EBADF;
+    out = 0xdeadbeef;
+    ret = p_get_errno(&out);
+    ok(ret == 0, "Expected _get_errno to return 0, got %d\n", ret);
+    ok(out == EBADF, "Expected output variable to be EBADF, got %d\n", out);
+}
+
 START_TEST(misc)
 {
     init();
@@ -249,4 +273,5 @@ START_TEST(misc)
     test_memcpy_s();
     test_I10_OUTPUT();
     test_strerror_s();
+    test__get_errno();
 }

include/msvcrt/stdlib.h

@@ -128,6 +128,7 @@ extern int*           __cdecl _errno(void);
  * char** _sys_errlist;
  */
 
+errno_t       __cdecl _get_errno(int*);
 
 typedef int (__cdecl *_onexit_t)(void);