[PATCH] fix menuconfig if saving on different fs

[Michael Buesch]

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Hi.

This patch fixes the behaviour of make menuconfig, if the
file in the "Save Configuration to Alternate File" menu is
on a different file-system, than the source tree.
Without this patch saving the config to /boot/xyz fails, if
boot is on an own filesystem.

patch against 2.5.69-bk19

Linus, please apply.

- -- 
Regards Michael Büsch
http://www.8ung.at/tuxsoft
 21:27:43 up  5:37,  4 users,  load average: 2.04, 1.35, 1.14

diff -urN -X /home/mb/dontdiff linux-2.5.69-bk19.vanilla/scripts/kconfig/confdata.c linux-2.5.69-bk19/scripts/kconfig/confdata.c
- --- linux-2.5.69-bk19.vanilla/scripts/kconfig/confdata.c	2003-05-26 20:24:44.000000000 +0200
+++ linux-2.5.69-bk19/scripts/kconfig/confdata.c	2003-05-26 21:23:47.000000000 +0200
@@ -1,6 +1,9 @@
 /*
  * Copyright (C) 2002 Roman Zippel <[e-mail]>
  * Released under the terms of the GNU GPL v2.0.
+ *
+ * May 26, 2003 Michael Buesch <[e-mail]>:
+ *	fixed behaviour of conf_write() if "name" is on different file system.
  */
 
 #include <sys/stat.h>
@@ -239,7 +242,7 @@
 
 int conf_write(const char *name)
 {
- -	FILE *out, *out_h;
+	FILE *out, *out_h, *out_new;
 	struct symbol *sym;
 	struct menu *menu;
 	char oldname[128];
@@ -369,8 +372,30 @@
 
 	sprintf(oldname, "%s.old", name);
 	rename(name, oldname);
- -	if (rename(".tmpconfig", name))
- -		return 1;
+
+	if (rename(".tmpconfig", name)) {
+		if (errno == EXDEV) {
+			out = fopen(".tmpconfig", "r");
+			if (!out)
+				return 1;
+			out_new = fopen(name, "w");
+			if (!out_new) {
+				fclose(out);
+				return 1;
+			}
+			while ((l = fgetc(out)) != EOF) {
+				if (fputc(l, out_new) == EOF) {
+					fclose(out);
+					fclose(out_new);
+					return 1;
+				}
+			}
+			fclose(out);
+			fclose(out_new);
+			unlink(".tmpconfig");
+		} else
+			return 1;
+	}
 
 	sym_change_count = 0;
 

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