/*
 * 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.
 *
 * @(#) Copyright (c) 1980, 1987, 1991, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)wc.c     8.1 (Berkeley) 6/6/93
 * $FreeBSD: head/usr.bin/wc/wc.c 281617 2015-04-16 21:44:35Z bdrewery $
 */

#include <sys/param.h>
#include <sys/stat.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <locale.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>

static uintmax_t tlinect, twordct, tcharct, tlongline;
static int doline, doword, dochar, domulti, dolongline;
static volatile sig_atomic_t siginfo;

static void     show_cnt(const char *file, uintmax_t linect, uintmax_t wordct,
                    uintmax_t charct, uintmax_t llct);
static int      cnt(const char *);
static void     usage(void);

#ifdef SIGINFO
static void
siginfo_handler(int sig __unused)
{
        siginfo = 1;
}
#endif

static void
reset_siginfo(void)
{
#ifdef SIGINFO
        signal(SIGINFO, SIG_DFL);
#endif
        siginfo = 0;
}

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

        setlocale(LC_CTYPE, "");

        while ((ch = getopt(argc, argv, "clmwL")) != -1) {
                switch (ch) {
                case 'l':
                        doline = 1;
                        break;
                case 'w':
                        doword = 1;
                        break;
                case 'c':
                        dochar = 1;
                        domulti = 0;
                        break;
                case 'L':
                        dolongline = 1;
                        break;
                case 'm':
                        domulti = 1;
                        dochar = 0;
                        break;
                case '?':
                default:
                        usage();
                }
        }
        argv += optind;
        argc -= optind;

#ifdef SIGINFO
        signal(SIGINFO, siginfo_handler);
#endif

        /* Wc's flags are on by default. */
        if (doline + doword + dochar + domulti + dolongline == 0)
                doline = doword = dochar = 1;

        errors = 0;
        total = 0;
        if (*argv == NULL) {
                if (cnt(NULL) != 0)
                        ++errors;
        } else {
                do {
                        if (cnt(*argv) != 0)
                                ++errors;
                        ++total;
                } while(*++argv);
        }

        if (total > 1)
                show_cnt("total", tlinect, twordct, tcharct, tlongline);
        exit(errors == 0 ? 0 : 1);
}

static void
show_cnt(const char *file, uintmax_t linect, uintmax_t wordct,
    uintmax_t charct, uintmax_t llct)
{
        FILE *out;

        if (!siginfo)
                out = stdout;
        else {
                out = stderr;
                siginfo = 0;
        }

        if (doline)
                fprintf(out, " %7ju", linect);
        if (doword)
                fprintf(out, " %7ju", wordct);
        if (dochar || domulti)
                fprintf(out, " %7ju", charct);
        if (dolongline)
                fprintf(out, " %7ju", llct);
        if (file != NULL)
                fprintf(out, " %s\n", file);
        else
                fprintf(out, "\n");
}

static int
cnt(const char *file)
{
        struct stat sb;
        uintmax_t linect, wordct, charct, llct, tmpll;
        int fd, len, warned;
        size_t clen;
        short gotsp;
        u_char *p;
        u_char buf[MAXBSIZE];
        wchar_t wch;
        mbstate_t mbs;

        linect = wordct = charct = llct = tmpll = 0;
        if (file == NULL) {
                fd = STDIN_FILENO;
        } else {
                if ((fd = open(file, O_RDONLY)) < 0) {
                        warn("%s: open", file);
                        return (1);
                }
                if (doword || (domulti && MB_CUR_MAX != 1))
                        goto word;
                /*
                 * 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))) {
                                if (len == -1) {
                                        warn("%s: read", file);
                                        close(fd);
                                        return (1);
                                }
                                if (siginfo) {
                                        show_cnt(file, linect, wordct, charct,
                                            llct);
                                }
                                charct += len;
                                for (p = buf; len--; ++p) {
                                        if (*p == '\n') {
                                                if (tmpll > llct)
                                                        llct = tmpll;
                                                tmpll = 0;
                                                ++linect;
                                        } else
                                                tmpll++;
                                }
                        }
                        reset_siginfo();
                        tlinect += linect;
                        if (dochar)
                                tcharct += charct;
                        if (dolongline) {
                                if (llct > tlongline)
                                        tlongline = llct;
                        }
                        show_cnt(file, linect, wordct, charct, llct);
                        close(fd);
                        return (0);
                }
                /*
                 * If all we need is the number of characters and it's a
                 * regular file, just stat the puppy.
                 */
                if (dochar || domulti) {
                        if (fstat(fd, &sb)) {
                                warn("%s: fstat", file);
                                close(fd);
                                return (1);
                        }
                        /* Pseudo-filesystems advertize a zero size. */
                        if (S_ISREG(sb.st_mode) && sb.st_size > 0) {
                                reset_siginfo();
                                charct = sb.st_size;
                                show_cnt(file, linect, wordct, charct, llct);
                                tcharct += charct;
                                close(fd);
                                return (0);
                        }
                }
        }

        /* Do it the hard way... */
word:   gotsp = 1;
        warned = 0;
        memset(&mbs, 0, sizeof(mbs));
        while ((len = read(fd, buf, MAXBSIZE)) != 0) {
                if (len == -1) {
                        warn("%s: read", file != NULL ? file : "stdin");
                        close(fd);
                        return (1);
                }
                p = buf;
                while (len > 0) {
                        if (siginfo)
                                show_cnt(file, linect, wordct, charct, llct);
                        if (!domulti || MB_CUR_MAX == 1) {
                                clen = 1;
                                wch = (unsigned char)*p;
                        } else if ((clen = mbrtowc(&wch, p, len, &mbs)) ==
                            (size_t)-1) {
                                if (!warned) {
                                        errno = EILSEQ;
                                        warn("%s",
                                            file != NULL ? file : "stdin");
                                        warned = 1;
                                }
                                memset(&mbs, 0, sizeof(mbs));
                                clen = 1;
                                wch = (unsigned char)*p;
                        } else if (clen == (size_t)-2)
                                break;
                        else if (clen == 0)
                                clen = 1;
                        charct++;
                        if (wch != L'\n')
                                tmpll++;
                        len -= clen;
                        p += clen;
                        if (wch == L'\n') {
                                if (tmpll > llct)
                                        llct = tmpll;
                                tmpll = 0;
                                ++linect;
                        }
                        if (iswspace(wch))
                                gotsp = 1;
                        else if (gotsp) {
                                gotsp = 0;
                                ++wordct;
                        }
                }
        }
        reset_siginfo();
        if (domulti && MB_CUR_MAX > 1)
                if (mbrtowc(NULL, NULL, 0, &mbs) == (size_t)-1 && !warned)
                        warn("%s", file != NULL ? file : "stdin");
        if (doline)
                tlinect += linect;
        if (doword)
                twordct += wordct;
        if (dochar || domulti)
                tcharct += charct;
        if (dolongline) {
                if (llct > tlongline)
                        tlongline = llct;
        }
        show_cnt(file, linect, wordct, charct, llct);
        close(fd);
        return (0);
}

static void
usage(void)
{
        fprintf(stderr, "usage: wc [-Lclmw] [file ...]\n");
        exit(1);
}