From f630faee2045fa28c61a3cea760ab8a9b65c1bb3 Mon Sep 17 00:00:00 2001
From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Date: Wed, 14 Apr 2010 06:57:27 +0200
Subject: win32: Replace rename() (WHY?)

---
 include/mingw.h |  2 ++
 win32/mingw.c   | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/include/mingw.h b/include/mingw.h
index ed718fb5d..c2953c390 100644
--- a/include/mingw.h
+++ b/include/mingw.h
@@ -121,7 +121,9 @@ NOIMPL(sigfillset,int *mask UNUSED_PARAM);
 
 int fdprintf(int fd, const char *format, ...);
 FILE* mingw_fopen(const char *filename, const char *mode);
+int mingw_rename(const char*, const char*);
 #define fopen mingw_fopen
+#define rename mingw_rename
 
 /*
  * ANSI emulation wrappers
diff --git a/win32/mingw.c b/win32/mingw.c
index 61f786287..eeb96db83 100644
--- a/win32/mingw.c
+++ b/win32/mingw.c
@@ -476,6 +476,40 @@ char *mingw_getcwd(char *pointer, int len)
 	return ret;
 }
 
+#undef rename
+int mingw_rename(const char *pold, const char *pnew)
+{
+	DWORD attrs;
+
+	/*
+	 * Try native rename() first to get errno right.
+	 * It is based on MoveFile(), which cannot overwrite existing files.
+	 */
+	if (!rename(pold, pnew))
+		return 0;
+	if (errno != EEXIST)
+		return -1;
+	if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
+		return 0;
+	/* TODO: translate more errors */
+	if (GetLastError() == ERROR_ACCESS_DENIED &&
+	    (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
+		if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
+			errno = EISDIR;
+			return -1;
+		}
+		if ((attrs & FILE_ATTRIBUTE_READONLY) &&
+		    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
+			if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
+				return 0;
+			/* revert file attributes on failure */
+			SetFileAttributes(pnew, attrs);
+		}
+	}
+	errno = EACCES;
+	return -1;
+}
+
 struct passwd *getpwuid(int uid)
 {
 	static char user_name[100];
-- 
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