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-rw-r--r--compat/winansi.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/compat/winansi.c b/compat/winansi.c
index db4a5b0a37..cb725fb02f 100644
--- a/compat/winansi.c
+++ b/compat/winansi.c
@@ -7,6 +7,9 @@
#include <wingdi.h>
#include <winreg.h>
+/* In this file, we actually want to use Windows' own isatty(). */
+#undef isatty
+
/*
ANSI codes used by git: m, K
@@ -570,6 +573,36 @@ static void detect_msys_tty(int fd)
#endif
+int winansi_isatty(int fd)
+{
+ int res = isatty(fd);
+
+ if (res) {
+ /*
+ * Make sure that /dev/null is not fooling Git into believing
+ * that we are connected to a terminal, as "_isatty() returns a
+ * nonzero value if the descriptor is associated with a
+ * character device."; for more information, see
+ *
+ * https://msdn.microsoft.com/en-us/library/f4s0ddew.aspx
+ */
+ HANDLE handle = (HANDLE)_get_osfhandle(fd);
+ if (fd == STDIN_FILENO) {
+ DWORD dummy;
+
+ if (!GetConsoleMode(handle, &dummy))
+ res = 0;
+ } else if (fd == STDOUT_FILENO || fd == STDERR_FILENO) {
+ CONSOLE_SCREEN_BUFFER_INFO dummy;
+
+ if (!GetConsoleScreenBufferInfo(handle, &dummy))
+ res = 0;
+ }
+ }
+
+ return res;
+}
+
void winansi_init(void)
{
int con1, con2;