/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1983, 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 "lp.cdefs.h"           /* A cross-platform version of <sys/cdefs.h> */
/*
 * Do Printer accounting summary.
 * Currently, usage is
 *      pac [-Pprinter] [-pprice] [-s] [-r] [-c] [-m] [user ...]
 * to print the usage information for the named people.
 */

#include <sys/param.h>

#include <dirent.h>
#include <err.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "lp.h"
#include "lp.local.h"

static char     *acctfile;      /* accounting file (input data) */
static int       allflag = 1;   /* Get stats on everybody */
static int       errs;
static size_t    hcount;        /* Count of hash entries */
static int       mflag = 0;     /* disregard machine names */
static int       pflag = 0;     /* 1 if -p on cmd line */
static float     price = 0.02;  /* cost per page (or what ever) */
static int       reverse;       /* Reverse sort order */
static int       sort;          /* Sort by cost */
static char     *sumfile;       /* summary file */
static int       summarize;     /* Compress accounting file */

uid_t   uid, euid;

/*
 * Grossness follows:
 *  Names to be accumulated are hashed into the following
 *  table.
 */

#define HSHSIZE 97                      /* Number of hash buckets */

struct hent {
        struct  hent *h_link;           /* Forward hash link */
        char    *h_name;                /* Name of this user */
        float   h_feetpages;            /* Feet or pages of paper */
        int     h_count;                /* Number of runs */
};

static struct   hent    *hashtab[HSHSIZE];      /* Hash table proper */

int              main(int argc, char **_argv);
static void      account(FILE *_acctf);
static int       any(int _ch, const char _str[]);
static int       chkprinter(const char *_ptrname);
static void      dumpit(void);
static int       hash(const char _name[]);
static struct hent      *enter(const char _name[]);
static struct hent      *lookup(const char _name[]);
static int       qucmp(const void *_a, const void *_b);
static void      rewrite(void);
static void      usage(void);

int
main(int argc, char **argv)
{
        FILE *acctf;
        const char *cp, *printer;

        printer = NULL;
        euid = geteuid();       /* these aren't used in pac(1) */
        uid = getuid();
        while (--argc) {
                cp = *++argv;
                if (*cp++ == '-') {
                        switch(*cp++) {
                        case 'P':
                                /*
                                 * Printer name.
                                 */
                                printer = cp;
                                continue;

                        case 'p':
                                /*
                                 * get the price.
                                 */
                                price = atof(cp);
                                pflag = 1;
                                continue;

                        case 's':
                                /*
                                 * Summarize and compress accounting file.
                                 */
                                summarize++;
                                continue;

                        case 'c':
                                /*
                                 * Sort by cost.
                                 */
                                sort++;
                                continue;

                        case 'm':
                                /*
                                 * disregard machine names for each user
                                 */
                                mflag = 1;
                                continue;

                        case 'r':
                                /*
                                 * Reverse sorting order.
                                 */
                                reverse++;
                                continue;

                        default:
                                usage();
                        }
                }
                (void) enter(--cp);
                allflag = 0;
        }
        if (printer == NULL && (printer = getenv("PRINTER")) == NULL)
                printer = DEFLP;
        if (!chkprinter(printer)) {
                printf("pac: unknown printer %s\n", printer);
                exit(2);
        }

        if ((acctf = fopen(acctfile, "r")) == NULL) {
                perror(acctfile);
                exit(1);
        }
        account(acctf);
        fclose(acctf);
        if ((acctf = fopen(sumfile, "r")) != NULL) {
                account(acctf);
                fclose(acctf);
        }
        if (summarize)
                rewrite();
        else
                dumpit();
        exit(errs);
}

static void
usage(void)
{
        fprintf(stderr,
        "usage: pac [-Pprinter] [-pprice] [-s] [-c] [-r] [-m] [user ...]\n");
        exit(1);
}

/*
 * Read the entire accounting file, accumulating statistics
 * for the users that we have in the hash table.  If allflag
 * is set, then just gather the facts on everyone.
 * Note that we must accommodate both the active and summary file
 * formats here.
 * Host names are ignored if the -m flag is present.
 */
static void
account(FILE *acctf)
{
        char linebuf[BUFSIZ];
        double t;
        register char *cp, *cp2;
        register struct hent *hp;
        register int ic;

        while (fgets(linebuf, BUFSIZ, acctf) != NULL) {
                cp = linebuf;
                while (any(*cp, " \t"))
                        cp++;
                t = atof(cp);
                while (any(*cp, ".0123456789"))
                        cp++;
                while (any(*cp, " \t"))
                        cp++;
                for (cp2 = cp; !any(*cp2, " \t\n"); cp2++)
                        ;
                ic = atoi(cp2);
                *cp2 = '\0';
                if (mflag && strchr(cp, ':'))
                    cp = strchr(cp, ':') + 1;
                hp = lookup(cp);
                if (hp == NULL) {
                        if (!allflag)
                                continue;
                        hp = enter(cp);
                }
                hp->h_feetpages += t;
                if (ic)
                        hp->h_count += ic;
                else
                        hp->h_count++;
        }
}

/*
 * Sort the hashed entries by name or footage
 * and print it all out.
 */
static void
dumpit(void)
{
        struct hent **base;
        register struct hent *hp, **ap;
        register int hno, runs;
        size_t c;
        float feet;

        hp = hashtab[0];
        hno = 1;
        base = (struct hent **) calloc(hcount, sizeof(hp));
        for (ap = base, c = hcount; c--; ap++) {
                while (hp == NULL)
                        hp = hashtab[hno++];
                *ap = hp;
                hp = hp->h_link;
        }
        qsort(base, hcount, sizeof hp, qucmp);
        printf("  Login               pages/feet   runs    price\n");
        feet = 0.0;
        runs = 0;
        for (ap = base, c = hcount; c--; ap++) {
                hp = *ap;
                runs += hp->h_count;
                feet += hp->h_feetpages;
                printf("%-24s %7.2f %4d   $%6.2f\n", hp->h_name,
                    hp->h_feetpages, hp->h_count, hp->h_feetpages * price);
        }
        if (allflag) {
                printf("\n");
                printf("%-24s %7.2f %4d   $%6.2f\n", "total", feet,
                    runs, feet * price);
        }
}

/*
 * Rewrite the summary file with the summary information we have accumulated.
 */
static void
rewrite(void)
{
        register struct hent *hp;
        register int i;
        FILE *acctf;

        if ((acctf = fopen(sumfile, "w")) == NULL) {
                warn("%s", sumfile);
                errs++;
                return;
        }
        for (i = 0; i < HSHSIZE; i++) {
                hp = hashtab[i];
                while (hp != NULL) {
                        fprintf(acctf, "%7.2f\t%s\t%d\n", hp->h_feetpages,
                            hp->h_name, hp->h_count);
                        hp = hp->h_link;
                }
        }
        fflush(acctf);
        if (ferror(acctf)) {
                warn("%s", sumfile);
                errs++;
        }
        fclose(acctf);
        if ((acctf = fopen(acctfile, "w")) == NULL)
                warn("%s", acctfile);
        else
                fclose(acctf);
}

/*
 * Hashing routines.
 */

/*
 * Enter the name into the hash table and return the pointer allocated.
 */

static struct hent *
enter(const char name[])
{
        register struct hent *hp;
        register int h;

        if ((hp = lookup(name)) != NULL)
                return(hp);
        h = hash(name);
        hcount++;
        hp = (struct hent *) calloc(1, sizeof(*hp));
        hp->h_name = strdup(name);
        hp->h_feetpages = 0.0;
        hp->h_count = 0;
        hp->h_link = hashtab[h];
        hashtab[h] = hp;
        return(hp);
}

/*
 * Lookup a name in the hash table and return a pointer
 * to it.
 */

static struct hent *
lookup(const char name[])
{
        register int h;
        register struct hent *hp;

        h = hash(name);
        for (hp = hashtab[h]; hp != NULL; hp = hp->h_link)
                if (strcmp(hp->h_name, name) == 0)
                        return(hp);
        return(NULL);
}

/*
 * Hash the passed name and return the index in
 * the hash table to begin the search.
 */
static int
hash(const char name[])
{
        register int h;
        register const char *cp;

        for (cp = name, h = 0; *cp; h = (h << 2) + *cp++)
                ;
        return((h & 0x7fffffff) % HSHSIZE);
}

/*
 * Other stuff
 */
static int
any(int ch, const char str[])
{
        register int c = ch;
        register const char *cp = str;

        while (*cp)
                if (*cp++ == c)
                        return(1);
        return(0);
}

/*
 * The qsort comparison routine.
 * The comparison is ascii collating order
 * or by feet of typesetter film, according to sort.
 */
static int
qucmp(const void *a, const void *b)
{
        register const struct hent *h1, *h2;
        register int r;

        h1 = *(const struct hent * const *)a;
        h2 = *(const struct hent * const *)b;
        if (sort)
                r = h1->h_feetpages < h2->h_feetpages ?
                    -1 : h1->h_feetpages > h2->h_feetpages;
        else
                r = strcmp(h1->h_name, h2->h_name);
        return(reverse ? -r : r);
}

/*
 * Perform lookup for printer name or abbreviation --
 */
static int
chkprinter(const char *ptrname)
{
        int stat;
        struct printer myprinter, *pp = &myprinter;

        init_printer(&myprinter);
        stat = getprintcap(ptrname, pp);
        switch(stat) {
        case PCAPERR_OSERR:
                printf("pac: getprintcap: %s\n", pcaperr(stat));
                exit(3);
        case PCAPERR_NOTFOUND:
                return 0;
        case PCAPERR_TCLOOP:
                fatal(pp, "%s", pcaperr(stat));
        }
        if ((acctfile = pp->acct_file) == NULL)
                errx(3, "accounting not enabled for printer %s", ptrname);
        if (!pflag && pp->price100)
                price = pp->price100/10000.0;
        asprintf(&sumfile, "%s_sum", acctfile);
        if (sumfile == NULL)
                errx(1, "asprintf failed");
        return(1);
}