win32: Replace rename() (WHY?)

2 files changed, 36 insertions, 0 deletions

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];