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For open/openat, if the flags parameter does not contain O_CREAT, the
3rd (variadic) mode_t parameter is irrelevant.  Many developers in the past
have passed mode_t (0, 044, 0644, or such), which might lead future people
to copy this broken idiom, and perhaps even believe this parameter has some
meaning or implication or application. Delete them all.
This comes out of a conversation where tb@ noticed that a strange (but
intentional) pledge behaviour is to always knock-out high-bits from
mode_t on a number of system calls as a safety factor, and his bewilderment
that this appeared to be happening against valid modes (at least visually),
but no sorry, they are all irrelevant junk.  They could all be 0xdeafbeef.
ok millert

/*	$OpenBSD: wc.c,v 1.27 2021/10/24 21:24:18 deraadt Exp $	*/

/*
 * Copyright (c) 1980, 1987, 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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/param.h>	/* MAXBSIZE */
#include <sys/stat.h>

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <locale.h>
#include <ctype.h>
#include <err.h>
#include <unistd.h>
#include <util.h>
#include <wchar.h>
#include <wctype.h>

int64_t	tlinect, twordct, tcharct;
int	doline, doword, dochar, humanchar, multibyte;
int	rval;
extern char *__progname;

static void print_counts(int64_t, int64_t, int64_t, char *);
static void format_and_print(int64_t);
static void cnt(char *);

int
main(int argc, char *argv[])
{
	int ch;

	setlocale(LC_CTYPE, "");

	if (pledge("stdio rpath", NULL) == -1)
		err(1, "pledge");

	while ((ch = getopt(argc, argv, "lwchm")) != -1)
		switch(ch) {
		case 'l':
			doline = 1;
			break;
		case 'w':
			doword = 1;
			break;
		case 'm':
			if (MB_CUR_MAX > 1)
				multibyte = 1;
			/* FALLTHROUGH */
		case 'c':
			dochar = 1;
			break;
		case 'h':
			humanchar = 1;
			break;
		case '?':
		default:
			fprintf(stderr,
			    "usage: %s [-c | -m] [-hlw] [file ...]\n",
			    __progname);
			return 1;
		}
	argv += optind;
	argc -= optind;

	/*
	 * wc is unusual in that its flags are on by default, so,
	 * if you don't get any arguments, you have to turn them
	 * all on.
	 */
	if (!doline && !doword && !dochar)
		doline = doword = dochar = 1;

	if (!*argv) {
		cnt(NULL);
	} else {
		int dototal = (argc > 1);

		do {
			cnt(*argv);
		} while(*++argv);

		if (dototal)
			print_counts(tlinect, twordct, tcharct, "total");
	}

	return rval;
}

static void
cnt(char *file)
{
	static char *buf;
	static size_t bufsz;

	FILE *stream;
	char *C;
	wchar_t wc;
	short gotsp;
	ssize_t len;
	int64_t linect, wordct, charct;
	struct stat sbuf;
	int fd;

	linect = wordct = charct = 0;
	stream = NULL;
	if (file) {
		if ((fd = open(file, O_RDONLY)) == -1) {
			warn("%s", file);
			rval = 1;
			return;
		}
	} else  {
		fd = STDIN_FILENO;
	}

	if (!doword && !multibyte) {
		if (bufsz < MAXBSIZE &&
		    (buf = realloc(buf, MAXBSIZE)) == NULL)
			err(1, NULL);
		/*
		 * Line counting is split out because it's a lot
		 * faster to get lines than to get words, since
		 * the word count requires some logic.
		 */
		if (doline) {
			while ((len = read(fd, buf, MAXBSIZE)) > 0) {
				charct += len;
				for (C = buf; len--; ++C)
					if (*C == '\n')
						++linect;
			}
			if (len == -1) {
				warn("%s", file);
				rval = 1;
			}
		}
		/*
		 * If all we need is the number of characters and
		 * it's a directory or a regular or linked file, just
		 * stat the puppy.  We avoid testing for it not being
		 * a special device in case someone adds a new type
		 * of inode.
		 */
		else if (dochar) {
			mode_t ifmt;

			if (fstat(fd, &sbuf)) {
				warn("%s", file);
				rval = 1;
			} else {
				ifmt = sbuf.st_mode & S_IFMT;
				if (ifmt == S_IFREG || ifmt == S_IFLNK
				    || ifmt == S_IFDIR) {
					charct = sbuf.st_size;
				} else {
					while ((len = read(fd, buf, MAXBSIZE)) > 0)
						charct += len;
					if (len == -1) {
						warn("%s", file);
						rval = 1;
					}
				}
			}
		}
	} else {
		if (file == NULL)
			stream = stdin;
		else if ((stream = fdopen(fd, "r")) == NULL) {
			warn("%s", file);
			close(fd);
			rval = 1;
			return;
		}

		/*
		 * Do it the hard way.
		 * According to POSIX, a word is a "maximal string of
		 * characters delimited by whitespace."  Nothing is said
		 * about a character being printing or non-printing.
		 */
		gotsp = 1;
		while ((len = getline(&buf, &bufsz, stream)) > 0) {
			if (multibyte) {
				const char *end = buf + len;
				for (C = buf; C < end; C += len) {
					++charct;
					len = mbtowc(&wc, C, MB_CUR_MAX);
					if (len == -1) {
						mbtowc(NULL, NULL,
						    MB_CUR_MAX);
						len = 1;
						wc = L'?';
					} else if (len == 0)
						len = 1;
					if (iswspace(wc)) {
						gotsp = 1;
						if (wc == L'\n')
							++linect;
					} else if (gotsp) {
						gotsp = 0;
						++wordct;
					}
				}
			} else {
				charct += len;
				for (C = buf; len--; ++C) {
					if (isspace((unsigned char)*C)) {
						gotsp = 1;
						if (*C == '\n')
							++linect;
					} else if (gotsp) {
						gotsp = 0;
						++wordct;
					}
				}
			}
		}
		if (ferror(stream)) {
			warn("%s", file);
			rval = 1;
		}
	}

	print_counts(linect, wordct, charct, file);

	/*
	 * Don't bother checking doline, doword, or dochar -- speeds
	 * up the common case
	 */
	tlinect += linect;
	twordct += wordct;
	tcharct += charct;

	if ((stream == NULL ? close(fd) : fclose(stream)) != 0) {
		warn("%s", file);
		rval = 1;
	}
}

static void
format_and_print(int64_t v)
{
	if (humanchar) {
		char result[FMT_SCALED_STRSIZE];

		fmt_scaled((long long)v, result);
		printf("%7s", result);
	} else {
		printf(" %7lld", v);
	}
}

static void
print_counts(int64_t lines, int64_t words, int64_t chars, char *name)
{
	if (doline)
		format_and_print(lines);
	if (doword)
		format_and_print(words);
	if (dochar)
		format_and_print(chars);

	if (name)
		printf(" %s\n", name);
	else
		printf("\n");
}