From 93ed62a6cb58b4c90872e28b1306e122ad7668b7 Mon Sep 17 00:00:00 2001
From: Thomas Blume <Thomas.Blume@suse.com>
Date: Thu, 24 Nov 2016 14:38:32 +0100
Subject: [PATCH] handle EXDEV during history file rename

port of: w3m-history-crossdev.patch
---
 history.c | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/history.c b/history.c
index 471059e..209385b 100644
--- a/history.c
+++ b/history.c
@@ -68,12 +68,14 @@ loadHistory(Hist *hist)
 void
 saveHistory(Hist *hist, size_t size)
 {
-    FILE *f;
+    FILE *f, *h = NULL;
     HistItem *item;
     char *tmpf;
     int rename_ret;
 #define FNAMELEN 255
     char fname[FNAMELEN+1] = HISTORY_FILE;
+    char buf[4096];
+    size_t rs, ws, remaining;
 
     if (hist == NULL || hist->list == NULL)
 	return;
@@ -99,7 +101,30 @@ saveHistory(Hist *hist, size_t size)
        strncat(fname, Session, FNAMELEN -6 - strlen(fname));
     }
     rename_ret = rename(tmpf, rcFile(fname));
-    if (rename_ret != 0) {
+
+    if (rename_ret == -1 && errno == EXDEV) {
+       if ((f = fopen(tmpf, "r")) && (h = fopen(rcFile(fname), "w"))) {
+           while (1) {
+               rs = fread(buf, 1, sizeof(buf), f);
+               if (rs == 0 || rs > sizeof(buf))
+                       break;
+               ws = fwrite(buf, 1, rs, h);
+               if (ws == rs)
+                       continue;
+               if (ws == 0 || ws > rs)
+                       break;
+               remaining = rs - ws;
+               while (remaining > 0) {
+                       ws = fwrite(buf + (rs - remaining), 1, remaining, h);
+                       if (ws == 0 || ws > remaining)
+                               break;
+                       remaining -= ws;
+               }
+           }
+       }
+       if (f) fclose(f);
+       if (h) fclose(h);
+    } else if (rename_ret != 0) {
 	disp_err_message("Can't save history", FALSE);
 	return;
     }
-- 
2.6.6