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dd: fix lint error about 'return expr' from void function

No change to the resulting binary. The 'return' statements are necessary
for GCC to generate the exact same object code, even though they can be
removed without affecting the functionality, as seen before the 'else'.

/*	$NetBSD: misc.c,v 1.25 2021/10/09 20:29:23 rillig Exp $	*/

/*-
 * Copyright (c) 1991, 1993, 1994
 *	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.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)misc.c	8.3 (Berkeley) 4/2/94";
#else
__RCSID("$NetBSD: misc.c,v 1.25 2021/10/09 20:29:23 rillig Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/time.h>

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
#include <inttypes.h>

#include "dd.h"
#include "extern.h"

#define	tv2mS(tv) ((tv).tv_sec * 1000LL + ((tv).tv_usec + 500) / 1000)

static void posix_summary(void);
#ifndef NO_MSGFMT
static void custom_summary(void);
static void human_summary(void);
static void quiet_summary(void);

static void buffer_write(const char *, size_t, int);
#endif /* NO_MSGFMT */

void
summary(void)
{

	if (progress)
		(void)write(STDERR_FILENO, "\n", 1);

#ifdef NO_MSGFMT
	posix_summary();
#else /* NO_MSGFMT */
	if (strcmp(msgfmt, "human") == 0) {
		human_summary();
		return;
	} else if (strcmp(msgfmt, "posix") == 0) {
		posix_summary();
		return;
	} else if (strcmp(msgfmt, "quiet") == 0)
		quiet_summary();
	else
		custom_summary();
#endif /* NO_MSGFMT */
}

static void
posix_summary(void)
{
	char buf[100];
	int64_t mS;
	struct timeval tv;

	if (progress)
		(void)write(STDERR_FILENO, "\n", 1);

	(void)gettimeofday(&tv, NULL);
	mS = tv2mS(tv) - tv2mS(st.start);
	if (mS == 0)
		mS = 1;

	/* Use snprintf(3) so that we don't reenter stdio(3). */
	(void)snprintf(buf, sizeof(buf),
	    "%llu+%llu records in\n%llu+%llu records out\n",
	    (unsigned long long)st.in_full,  (unsigned long long)st.in_part,
	    (unsigned long long)st.out_full, (unsigned long long)st.out_part);
	(void)write(STDERR_FILENO, buf, strlen(buf));
	if (st.swab) {
		(void)snprintf(buf, sizeof(buf), "%llu odd length swab %s\n",
		    (unsigned long long)st.swab,
		    (st.swab == 1) ? "block" : "blocks");
		(void)write(STDERR_FILENO, buf, strlen(buf));
	}
	if (st.trunc) {
		(void)snprintf(buf, sizeof(buf), "%llu truncated %s\n",
		    (unsigned long long)st.trunc,
		    (st.trunc == 1) ? "block" : "blocks");
		(void)write(STDERR_FILENO, buf, strlen(buf));
	}
	if (st.sparse) {
		(void)snprintf(buf, sizeof(buf), "%llu sparse output %s\n",
		    (unsigned long long)st.sparse,
		    (st.sparse == 1) ? "block" : "blocks");
		(void)write(STDERR_FILENO, buf, strlen(buf));
	}
	(void)snprintf(buf, sizeof(buf),
	    "%llu bytes transferred in %lu.%03d secs (%llu bytes/sec)\n",
	    (unsigned long long) st.bytes,
	    (long) (mS / 1000),
	    (int) (mS % 1000),
	    (unsigned long long) (st.bytes * 1000LL / mS));
	(void)write(STDERR_FILENO, buf, strlen(buf));
}

/* ARGSUSED */
void
summaryx(int notused)
{

	summary();
}

/* ARGSUSED */
void
terminate(int signo)
{

	summary();
	(void)raise_default_signal(signo);
	_exit(127);
}

#ifndef NO_MSGFMT
/*
 * Buffer write(2) calls
 */
static void
buffer_write(const char *str, size_t size, int flush)
{
	static char wbuf[128];
	static size_t cnt = 0; /* Internal counter to allow wbuf to wrap */
	
	unsigned int i;

	for (i = 0; i < size; i++) {
		if (str != NULL) {
			wbuf[cnt++] = str[i];
		}
		if (cnt >= sizeof(wbuf)) {
			(void)write(STDERR_FILENO, wbuf, cnt);
			cnt = 0;
		}
	}

	if (flush != 0) {
		(void)write(STDERR_FILENO, wbuf, cnt);
		cnt = 0;
	}
}

/*
 * Write summary to stderr according to format 'fmt'. If 'enable' is 0, it
 * will not attempt to write anything. Can be used to validate the
 * correctness of the 'fmt' string.
 */
int
dd_write_msg(const char *fmt, int enable)
{
	char hbuf[7], nbuf[32];
	const char *ptr;
	int64_t mS;
	struct timeval tv;

	(void)gettimeofday(&tv, NULL);
	mS = tv2mS(tv) - tv2mS(st.start);
	if (mS == 0)
		mS = 1;

#define ADDC(c) do { if (enable != 0) buffer_write(&c, 1, 0); } \
	while (0)
#define ADDS(p) do { if (enable != 0) buffer_write(p, strlen(p), 0); } \
	while (0)

	for (ptr = fmt; *ptr; ptr++) {
		if (*ptr != '%') {
			ADDC(*ptr);
			continue;
		}

 		switch (*++ptr) {
		case 'b':
			(void)snprintf(nbuf, sizeof(nbuf), "%llu",
			    (unsigned long long)st.bytes);
			ADDS(nbuf);
			break;
		case 'B':
			if (humanize_number(hbuf, sizeof(hbuf),
			    st.bytes, "B",
			    HN_AUTOSCALE, HN_DECIMAL) == -1)
				warnx("humanize_number (bytes transferred)");
			ADDS(hbuf);
			break;
		case 'e':
			(void)snprintf(nbuf, sizeof(nbuf), "%llu",
			    (unsigned long long) (st.bytes * 1000LL / mS));
			ADDS(nbuf);
			break;
		case 'E':
			if (humanize_number(hbuf, sizeof(hbuf),
			    st.bytes * 1000LL / mS, "B",
			    HN_AUTOSCALE, HN_DECIMAL) == -1)
				warnx("humanize_number (bytes per second)");
			ADDS(hbuf); ADDS("/sec");
			break;
		case 'i':
			(void)snprintf(nbuf, sizeof(nbuf), "%llu",
			    (unsigned long long)st.in_part);
			ADDS(nbuf);
			break;
		case 'I':
			(void)snprintf(nbuf, sizeof(nbuf), "%llu",
			    (unsigned long long)st.in_full);
			ADDS(nbuf);
			break;
		case 'o':
			(void)snprintf(nbuf, sizeof(nbuf), "%llu",
			    (unsigned long long)st.out_part);
			ADDS(nbuf);
			break;
		case 'O':
			(void)snprintf(nbuf, sizeof(nbuf), "%llu",
			    (unsigned long long)st.out_full);
			ADDS(nbuf);
			break;
		case 's':
			(void)snprintf(nbuf, sizeof(nbuf), "%li.%03d",
			    (long) (mS / 1000), (int) (mS % 1000));
			ADDS(nbuf);
			break;
		case 'p':
			(void)snprintf(nbuf, sizeof(nbuf), "%llu",
			    (unsigned long long)st.sparse);
			ADDS(nbuf);
			break;
		case 't':
			(void)snprintf(nbuf, sizeof(nbuf), "%llu",
			    (unsigned long long)st.trunc);
			ADDS(nbuf);
			break;
		case 'w':
			(void)snprintf(nbuf, sizeof(nbuf), "%llu",
			    (unsigned long long)st.swab);
			ADDS(nbuf);
			break;
		case 'P':
			ADDS("block");
			if (st.sparse != 1) ADDS("s");
			break;
		case 'T':
			ADDS("block");
			if (st.trunc != 1) ADDS("s");
			break;
		case 'W':
			ADDS("block");
			if (st.swab != 1) ADDS("s");
			break;
		case '%':
			ADDC(*ptr);
			break;
		default:
			if (*ptr == '\0')
				goto done;
			errx(EXIT_FAILURE, "unknown specifier '%c' in "
			    "msgfmt string", *ptr);
			/* NOTREACHED */
		}
	}

done:
	/* flush buffer */
	buffer_write(NULL, 0, 1);
	return 0;
}

static void
custom_summary(void)
{

	dd_write_msg(msgfmt, 1);
}

static void
human_summary(void)
{
	(void)dd_write_msg("%I+%i records in\n%O+%o records out\n", 1);
	if (st.swab) {
		(void)dd_write_msg("%w odd length swab %W\n", 1);
	}
	if (st.trunc) {
		(void)dd_write_msg("%t truncated %T\n", 1);
	}
	if (st.sparse) {
		(void)dd_write_msg("%p sparse output %P\n", 1);
	}
	(void)dd_write_msg("%b bytes (%B) transferred in %s secs "
	    "(%e bytes/sec - %E)\n", 1);
}

static void
quiet_summary(void)
{

	/* stay quiet */
}
#endif /* NO_MSGFMT */