fix worst-case buffer sizes for non-blocking I/O

[unix-history] / usr / src / bin / dd / misc.c

/*-
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Keith Muller of the University of California, San Diego and Lance
* Visser of Convex Computer Corporation.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char sccsid[] = "@(#)misc.c      5.3 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include "dd.h"
#include "extern.h"

/* ARGSUSED */
void
summary(notused)
       int notused;
{
       int len;
       char buf[100];

       /* Use snprintf(3) so that we don't reenter stdio(3). */
       len = snprintf(buf, sizeof(buf),
           "%u+%u records in\n%u+%u records out\n",
           st.in_full, st.in_part, st.out_full, st.out_part);
       (void)write(STDERR_FILENO, buf, len);
       if (st.swab) {
               len = snprintf(buf, sizeof(buf), "%u odd length swab %s\n",
                    st.swab, (st.swab == 1) ? "block" : "blocks");
               (void)write(STDERR_FILENO, buf, len);
       }
       if (st.trunc) {
               len = snprintf(buf, sizeof(buf), "%u truncated %s\n",
                    st.trunc, (st.trunc == 1) ? "block" : "blocks");
               (void)write(STDERR_FILENO, buf, len);
       }
}

/* ARGSUSED */
void
terminate(notused)
       int notused;
{
       summary(0);
       exit(0);
}

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

void
#if __STDC__
err(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, "dd: ");
       (void)vfprintf(stderr, fmt, ap);
       va_end(ap);
       (void)fprintf(stderr, "\n");
       exit(1);
       /* NOTREACHED */
}

void
#if __STDC__
warn(const char *fmt, ...)
#else
warn(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, "dd: ");
       (void)vfprintf(stderr, fmt, ap);
       va_end(ap);
       (void)fprintf(stderr, "\n");
}