rename: a new file for Curl_rename()

And make the cookie save function use it.

lib/Makefile.inc

@@ -63,7 +63,7 @@ LIB_CFILES = file.c timeval.c base64.c hostip.c progress.c formdata.c   \
   curl_multibyte.c hostcheck.c conncache.c dotdot.c                     \
   x509asn1.c http2.c smb.c curl_endian.c curl_des.c system_win32.c      \
   mime.c sha256.c setopt.c curl_path.c curl_ctype.c curl_range.c psl.c  \
-  doh.c urlapi.c curl_get_line.c altsvc.c socketpair.c
+  doh.c urlapi.c curl_get_line.c altsvc.c socketpair.c rename.c
 
 LIB_HFILES = arpa_telnet.h netrc.h file.h timeval.h hostip.h progress.h \
   formdata.h cookie.h http.h sendf.h ftp.h url.h dict.h if2ip.h         \
@@ -84,7 +84,7 @@ LIB_HFILES = arpa_telnet.h netrc.h file.h timeval.h hostip.h progress.h \
   x509asn1.h http2.h sigpipe.h smb.h curl_endian.h curl_des.h           \
   curl_printf.h system_win32.h rand.h mime.h curl_sha256.h setopt.h     \
   curl_path.h curl_ctype.h curl_range.h psl.h doh.h urlapi-int.h        \
-  curl_get_line.h altsvc.h quic.h socketpair.h
+  curl_get_line.h altsvc.h quic.h socketpair.h rename.h
 
 LIB_RCFILES = libcurl.rc
 

lib/cookie.c

@@ -98,6 +98,7 @@ Example set of cookies:
 #include "inet_pton.h"
 #include "parsedate.h"
 #include "rand.h"
+#include "rename.h"
 
 /* The last 3 #include files should be in this order */
 #include "curl_printf.h"
@@ -1494,31 +1495,6 @@ static char *get_netscape_format(const struct Cookie *co)
     co->value?co->value:"");
 }
 
-/* return 0 on success, 1 on error */
-static int xrename(const char *oldpath, const char *newpath)
-{
-#ifdef WIN32
-  /* rename() on Windows doesn't overwrite, so we can't use it here.
-     MoveFileExA() will overwrite and is usually atomic, however it fails
-     when there are open handles to the file. */
-  const int max_wait_ms = 1000;
-  struct curltime start = Curl_now();
-  for(;;) {
-    timediff_t diff;
-    if(MoveFileExA(oldpath, newpath, MOVEFILE_REPLACE_EXISTING))
-      break;
-    diff = Curl_timediff(Curl_now(), start);
-    if(diff < 0 || diff > max_wait_ms)
-      return 1;
-    Sleep(1);
-  }
-#else
-  if(rename(oldpath, newpath))
-    return 1;
-#endif
-  return 0;
-}
-
 /*
  * cookie_output()
  *
@@ -1606,7 +1582,7 @@ static int cookie_output(struct Curl_easy *data,
   if(out && !use_stdout) {
     fclose(out);
     out = NULL;
-    if(xrename(tempstore, filename)) {
+    if(Curl_rename(tempstore, filename)) {
       unlink(tempstore);
       goto error;
     }

lib/rename.c

@@ -0,0 +1,62 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#include "rename.h"
+
+#include "curl_setup.h"
+
+#if (!defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_COOKIES)) ||  \
+  defined(USE_ALTSVC)
+
+#include "timeval.h"
+
+/* The last 3 #include files should be in this order */
+#include "curl_printf.h"
+#include "curl_memory.h"
+#include "memdebug.h"
+
+/* return 0 on success, 1 on error */
+int Curl_rename(const char *oldpath, const char *newpath)
+{
+#ifdef WIN32
+  /* rename() on Windows doesn't overwrite, so we can't use it here.
+     MoveFileExA() will overwrite and is usually atomic, however it fails
+     when there are open handles to the file. */
+  const int max_wait_ms = 1000;
+  struct curltime start = Curl_now();
+  for(;;) {
+    timediff_t diff;
+    if(MoveFileExA(oldpath, newpath, MOVEFILE_REPLACE_EXISTING))
+      break;
+    diff = Curl_timediff(Curl_now(), start);
+    if(diff < 0 || diff > max_wait_ms)
+      return 1;
+    Sleep(1);
+  }
+#else
+  if(rename(oldpath, newpath))
+    return 1;
+#endif
+  return 0;
+}
+
+#endif

lib/rename.h

@@ -0,0 +1,27 @@
+#ifndef HEADER_CURL_RENAME_H
+#define HEADER_CURL_RENAME_H
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+int Curl_rename(const char *oldpath, const char *newpath);
+
+#endif /* HEADER_CURL_RENAME_H */