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Date:      Tue, 25 Jul 2017 00:28:29 +0000 (UTC)
From:      Mark Johnston <markj@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org
Subject:   svn commit: r321447 - stable/11/sbin/savecore
Message-ID:  <201707250028.v6P0STIp076077@repo.freebsd.org>
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Author: markj
Date: Tue Jul 25 00:28:29 2017
New Revision: 321447
URL: https://svnweb.freebsd.org/changeset/base/321447

Log:
  MFC r320896:
  Add a subroutine for comparing kerneldump identifiers.

Modified:
  stable/11/sbin/savecore/savecore.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sbin/savecore/savecore.c
==============================================================================
--- stable/11/sbin/savecore/savecore.c	Tue Jul 25 00:28:23 2017	(r321446)
+++ stable/11/sbin/savecore/savecore.c	Tue Jul 25 00:28:29 2017	(r321447)
@@ -308,6 +308,13 @@ check_space(const char *savedir, off_t dumpsize, int b
 	return (1);
 }
 
+static bool
+compare_magic(const struct kerneldumpheader *kdh, const char *magic)
+{
+
+	return (strncmp(kdh->magic, magic, sizeof(kdh->magic)) == 0);
+}
+
 #define BLOCKSIZE (1<<12)
 #define BLOCKMASK (~(BLOCKSIZE-1))
 
@@ -534,7 +541,7 @@ DoFile(const char *savedir, const char *device)
 	}
 	memcpy(&kdhl, temp, sizeof(kdhl));
 	istextdump = 0;
-	if (strncmp(kdhl.magic, TEXTDUMPMAGIC, sizeof kdhl) == 0) {
+	if (compare_magic(&kdhl, TEXTDUMPMAGIC)) {
 		if (verbose)
 			printf("textdump magic on last dump header on %s\n",
 			    device);
@@ -548,8 +555,7 @@ DoFile(const char *savedir, const char *device)
 			if (force == 0)
 				goto closefd;
 		}
-	} else if (memcmp(kdhl.magic, KERNELDUMPMAGIC, sizeof kdhl.magic) ==
-	    0) {
+	} else if (compare_magic(&kdhl, KERNELDUMPMAGIC)) {
 		if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
 			syslog(LOG_ERR,
 			    "unknown version (%d) in last dump header on %s",
@@ -568,8 +574,7 @@ DoFile(const char *savedir, const char *device)
 		if (force == 0)
 			goto closefd;
 
-		if (memcmp(kdhl.magic, KERNELDUMPMAGIC_CLEARED,
-			    sizeof kdhl.magic) == 0) {
+		if (compare_magic(&kdhl, KERNELDUMPMAGIC_CLEARED)) {
 			if (verbose)
 				printf("forcing magic on %s\n", device);
 			memcpy(kdhl.magic, KERNELDUMPMAGIC,

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