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Use ftruncate() instead of lseek()+write()+lseek() to set the created

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file (-C) to the requested size.

Submitted by:	Christoph Mallon <christoph mallon gmx de>
This commit is contained in:
Ed Schouten 2009-04-11 14:33:10 +00:00
parent e532d3fafa
commit 18a064438f
1 changed files with 1 additions and 5 deletions
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6
sbin/newfs_msdos/newfs_msdos.c
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@ -356,17 +356,13 @@ main(int argc, char *argv[])
}
dtype = *argv;
if (opt_create) {
off_t pos;
if (opt_N)
errx(1, "create (-C) is incompatible with -N");
fd = open(fname, O_RDWR | O_CREAT | O_TRUNC, 0644);
if (fd == -1)
errx(1, "failed to create %s", fname);
pos = lseek(fd, opt_create - 1, SEEK_SET);
if (write(fd, "\0", 1) != 1)
if (ftruncate(fd, opt_create))
errx(1, "failed to initialize %jd bytes", (intmax_t)opt_create);
pos = lseek(fd, 0, SEEK_SET);
} else if ((fd = open(fname, opt_N ? O_RDONLY : O_RDWR)) == -1 ||
fstat(fd, &sb))
err(1, "%s", fname);