integrate into the source tree, yank to 5.1, minor lint

[unix-history] / usr / src / libexec / lfs_cleanerd / misc.c

/*-
* Copyright (c) 1992 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char sccsid[] = "@(#)misc.c      5.1 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>

#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

extern char *special;

#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

void
#if __STDC__
err(const int fatal, const char *fmt, ...)
#else
err(fmt, va_alist)
       char *fmt;
       va_dcl
#endif
{
       va_list ap;
#if __STDC__
       va_start(ap, fmt);
#else
       va_start(ap);
#endif
       (void)fprintf(stderr, "%s: ", special);
       (void)vfprintf(stderr, fmt, ap);
       va_end(ap);
       (void)fprintf(stderr, " %s\n", strerror(errno));
       if (fatal)
               exit(1);
}

void
get(fd, off, p, len)
       int fd;
       off_t off;
       void *p;
       size_t len;
{
       int rbytes;

       if (lseek(fd, off, SEEK_SET) < 0)
               err(1, "%s: %s", special, strerror(errno));
       if ((rbytes = read(fd, p, len)) < 0)
               err(1, "%s: %s", special, strerror(errno));
       if (rbytes != len)
               err(1, "%s: short read (%d, not %d)", special, rbytes, len);
}