[PATCH v2] compat/winansi: fix die_lasterr() argument formatting

[Yongqiang Tian <yqtian668@gmail.com>]

During WinANSI initialization, duplicate_handle() reports the handle
when DuplicateHandle() fails. die_lasterr() collects the formatting
arguments in a va_list, but passes that va_list to die_errno() as an
ordinary variadic argument. die_errno() consequently formats part of
the va_list representation instead of the supplied handle, producing
an incorrect fatal message.

The helper also converts GetLastError() to errno, losing the exact
Windows error code.

Remove die_lasterr() and report GetLastError() directly at its four
call sites, following the existing Windows diagnostic style. This
passes the handle to the formatter correctly and preserves the Windows
error code. Keep the existing %li representation of the handle.

With MinGW GCC 13, compat/winansi.o builds with DEVELOPER=1 and the
complete git.exe builds and links.

Signed-off-by: Yongqiang Tian <yqtian668@gmail.com>
---

Changes since v1:
- replace die_lasterr() with direct die() calls;
- preserve exact GetLastError() values instead of mapping them to errno;
- follow the existing Windows diagnostic style and retain %li for the
  handle;
- verify compat/winansi.o with DEVELOPER=1 and build and link the
  complete git.exe with MinGW GCC 13.

 compat/winansi.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/compat/winansi.c b/compat/winansi.c
index 3ce1900939..088734a1df 100644
--- a/compat/winansi.c
+++ b/compat/winansi.c
@@ -436,15 +436,6 @@ static void winansi_exit(void)
 	CloseHandle(hthread);
 }
 
-static void die_lasterr(const char *fmt, ...)
-{
-	va_list params;
-	va_start(params, fmt);
-	errno = err_win_to_posix(GetLastError());
-	die_errno(fmt, params);
-	va_end(params);
-}
-
 #undef dup2
 int winansi_dup2(int oldfd, int newfd)
 {
@@ -462,8 +453,8 @@ static HANDLE duplicate_handle(HANDLE hnd)
 	HANDLE hresult, hproc = GetCurrentProcess();
 	if (!DuplicateHandle(hproc, hnd, hproc, &hresult, 0, TRUE,
 			DUPLICATE_SAME_ACCESS))
-		die_lasterr("DuplicateHandle(%li) failed",
-			(long) (intptr_t) hnd);
+		die("DuplicateHandle(%li) failed: %lu",
+		    (long) (intptr_t) hnd, GetLastError());
 	return hresult;
 }
 
@@ -609,16 +600,16 @@ void winansi_init(void)
 	hwrite = CreateNamedPipeW(name, PIPE_ACCESS_OUTBOUND,
 		PIPE_TYPE_BYTE | PIPE_WAIT, 1, BUFFER_SIZE, 0, 0, NULL);
 	if (hwrite == INVALID_HANDLE_VALUE)
-		die_lasterr("CreateNamedPipe failed");
+		die("CreateNamedPipe failed: %lu", GetLastError());
 
 	hread = CreateFileW(name, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
 	if (hread == INVALID_HANDLE_VALUE)
-		die_lasterr("CreateFile for named pipe failed");
+		die("CreateFile for named pipe failed: %lu", GetLastError());
 
 	/* start console spool thread on the pipe's read end */
 	hthread = CreateThread(NULL, 0, console_thread, NULL, 0, NULL);
 	if (!hthread)
-		die_lasterr("CreateThread(console_thread) failed");
+		die("CreateThread(console_thread) failed: %lu", GetLastError());
 
 	/* schedule cleanup routine */
 	if (atexit(winansi_exit))
-- 
2.34.1