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PR/50910: David Binderman: Optimize memset.

This commit is contained in:
christos 2016-03-07 15:55:06 +00:00
parent 60d995df79
commit 161a4d81ea
1 changed files with 6 additions and 4 deletions
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10
sbin/newfs/mkfs.c
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@ -1,4 +1,4 @@
/* $NetBSD: mkfs.c,v 1.126 2016/03/07 15:09:55 dholland Exp $ */
/* $NetBSD: mkfs.c,v 1.127 2016/03/07 15:55:06 christos Exp $ */
/*
* Copyright (c) 1980, 1989, 1993
@ -73,7 +73,7 @@
#if 0
static char sccsid[] = "@(#)mkfs.c 8.11 (Berkeley) 5/3/95";
#else
__RCSID("$NetBSD: mkfs.c,v 1.126 2016/03/07 15:09:55 dholland Exp $");
__RCSID("$NetBSD: mkfs.c,v 1.127 2016/03/07 15:55:06 christos Exp $");
#endif
#endif /* not lint */
@ -735,8 +735,10 @@ mkfs(const char *fsys, int fi, int fo,
* Write out the super-block and zeros until the first cg info
*/
i = cgsblock(&sblock, 0) * sblock.fs_fsize - sblock.fs_sblockloc;
memset(iobuf, 0, i);
memcpy(iobuf, &sblock, sizeof sblock);
if ((size_t)i < sizeof(sblock))
errx(1, "No space for superblock");
memcpy(iobuf, &sblock, sizeof(sblock));
memset(iobuf + sizeof(sblock), 0, i - sizeof(sblock));
if (needswap)
ffs_sb_swap(&sblock, (struct fs *)iobuf);
if ((sblock.fs_old_flags & FS_FLAGS_UPDATED) == 0)