/*      $NetBSD: swaplist.c,v 1.25 2026/03/24 16:38:12 yamt Exp $       */

/*
 * Copyright (c) 1997 Matthew R. Green
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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
__RCSID("$NetBSD: swaplist.c,v 1.25 2026/03/24 16:38:12 yamt Exp $");
#endif


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

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

#define dbtoqb(b) dbtob((int64_t)(b))
#define pgtoqb(b) ((int64_t)(b) * page_size)

/*
 * NOTE:  This file is separate from swapctl.c so that pstat can grab it.
 */

#include "swapctl.h"

static int
swapent_cmp(const void *a, const void *b)
{
        const struct swapent *p, *q;
        size_t l1, l2;

        p = (const struct swapent *)a;
        q = (const struct swapent *)b;

        /*
         * Sort by priority first, highest priority first
         * (which means increasing order of the priority field)
         */
        if (p->se_priority != q->se_priority)
                return p->se_priority - q->se_priority;

        /*
         * Then sort by device name.  These are arbitrary,
         * and no order really makes more sense than any
         * other, but the kernel's lists of swap devices at
         * the same priority are reordered at will, but for
         * a better human experience, keeping a constant
         * ordering is better, this should achieve that.
         */
        if ((l1 = strlen(p->se_path)) != (l2 = strlen(q->se_path)))
                return l1 > l2 ? 1 : -1;
        return strcmp(p->se_path, q->se_path);
}

int
list_swap(int pri, int kflag, int pflag, int tflag, int dolong, int hflag)
{
        struct  swapent *sep, *fsep;
        long    blocksize;
        /* size, used, bad, avail */
        char    szbuf[5], usbuf[5], badbuf[5], avbuf[5];
        const   char *header, *suff;
        size_t  l;
        int     hlen, size, inuse, npgbad, ncounted, pathmax, cw;
        int     rnswap, nswap = swapctl(SWAP_NSWAP, 0, 0), i;
        int64_t totalsize, totalinuse, totalbad;
        int     page_size = sysconf(_SC_PAGESIZE);

        if (nswap < 1) {
                puts("no swap devices configured");
                return 0;
        }

        /*
         * treat the value from swapctl(SWAP_NSWAP) as a hint,
         * as the value might have changed (swap devices added
         * or removed) between when that info was obtained, and
         * when we actually request the stats.
         *
         * Assume it will be increasing (if descreasing no harm)
         * and allow for it to have grown a reasonable amount.
         *
         * Then we simply use however many swap table entries
         * the kernel returns from swapctl(SWAP_STATS), be that
         * more or less than swapctl(SWAP_NSWAP) claimed, or
         * as many as or less than we have allocated space for.
         * If the kernel has added even more than the guess
         * below, then we will not get all of them.   Oh well...
         */
        nswap += 3;

        fsep = sep = (struct swapent *)malloc(nswap * sizeof(*sep));
        if (sep == NULL)
                err(1, "malloc");
        rnswap = swapctl(SWAP_STATS, (void *)sep, nswap);
        if (rnswap < 0)
                err(1, "SWAP_STATS");

        if (rnswap == 0) {
                puts("no swap devices configured");
                return 0;
        }

        /* keep the list ordered, as long as it remains stable */
        if (rnswap > 1)
                qsort(sep, rnswap, sizeof(struct swapent), swapent_cmp);

        pathmax = 11;
        switch (kflag) {
                case 1:
                        header = "1K-blocks";
                        blocksize = 1024;
                        suff = "KBytes";
                        break;
                case 2:
                        suff = "MBytes";
                        header = "1M-blocks";
                        blocksize = 1024 * 1024;
                        break;
                case 3:
                        header = "1G-blocks";
                        blocksize = 1024 * 1024 * 1024;
                        suff = "GBytes";
                        break;
                default:
                        suff = "blocks";
                        if (!hflag) {
                                header = getbsize(&hlen, &blocksize);
                        } else {
                                header = "Size";
                                blocksize = 1; suff = ""; /* unused */
                        }
                        break;
        }
        if (hflag || kflag)
                hlen = strlen(header);

        cw = 8;
        if (dolong && tflag == 0) {
                totalsize = 0;
                for (i = rnswap; i-- > 0; sep++) {
                        if ((size_t)pathmax < (l = strlen(sep->se_path)))
                                pathmax = l;
                        totalsize += sep->se_nblks;
                }
                sep = fsep;

                if (!hflag) {
                        totalsize = dbtoqb(totalsize) / blocksize;
                        if (totalsize > 9999999990)
                                cw = 11;
                        else if (totalsize > 999999990)
                                cw = 10;
                        else if (totalsize > 99999990)
                                cw = 9;

                        if (hlen < cw)
                                hlen = cw;
                }

                /*
                 * The intent here is that for the 3 size columns,
                 * the units digit (or scale letter with -h) is always
                 * under the rightmost character of its heading, the
                 * '%' character is under the 't' in "Capacity" and
                 * the units digit of the priority is under the 'o'
                 * of "Priority".    This looks reasonably good.
                 */
                (void)printf("%-*s %*s %*s %*s %*s %8s  %s\n",
                    pathmax, "Device", hlen, header, cw, "Used",
                    cw, "Bad", cw, "Avail", "Capacity", "Priority");
        }
        totalsize = totalinuse = totalbad = ncounted = 0;
        for (; rnswap-- > 0; sep++) {
                if (pflag && sep->se_priority != pri)
                        continue;
                ncounted++;
                size = sep->se_nblks;
                inuse = sep->se_inuse;
                npgbad = sep->se_npgbad;
                totalsize += size;
                totalinuse += inuse;
                totalbad += npgbad;

                if (dolong && tflag == 0) {
                        if (hflag == 0) {
                                (void)printf("%-*s %*ld ",
                                    pathmax, sep->se_path, hlen,
                                    (long)(dbtoqb(size) / blocksize));

                                (void)printf("%*ld %*ld %*ld  %5.0f%%    %3d\n",
                                    cw, (long)(dbtoqb(inuse) / blocksize), cw,
                                    (long)(pgtoqb(npgbad) / blocksize), cw,
                                    (long)(dbtoqb(size - inuse) / blocksize),
                                    (double)inuse / (double)size * 100.0,
                                    sep->se_priority);
                        } else {
                                if ((humanize_number(szbuf, sizeof(szbuf),
                                    (dbtoqb(size)), "", HN_AUTOSCALE,
                                    (HN_DECIMAL | HN_B | HN_NOSPACE))) == -1)
                                        err(1, "humanize_number");
                                if ((humanize_number(usbuf, sizeof(usbuf),
                                    (dbtoqb(inuse)), "", HN_AUTOSCALE,
                                    (HN_DECIMAL | HN_B | HN_NOSPACE))) == -1)
                                        err(1, "humanize_number");
                                if ((humanize_number(badbuf, sizeof(badbuf),
                                    (pgtoqb(npgbad)), "", HN_AUTOSCALE,
                                    (HN_DECIMAL | HN_B | HN_NOSPACE))) == -1)
                                        err(1, "humanize_number");
                                if ((humanize_number(avbuf, sizeof(avbuf),
                                    (dbtoqb(size-inuse)), "", HN_AUTOSCALE,
                                    (HN_DECIMAL | HN_B | HN_NOSPACE))) == -1)
                                        err(1, "humanize_number");
                                (void)printf("%-*s %*s ",
                                    pathmax, sep->se_path, hlen, szbuf);

                                (void)printf("%*s %*s %*s  %5.0f%%    %3d\n",
                                    cw, usbuf, cw, badbuf, cw, avbuf,
                                    (double)inuse / (double)size * 100.0,
                                    sep->se_priority);
                        }
                }
        }
        if (tflag) {
                if (hflag) {
                        if ((humanize_number(usbuf, sizeof(usbuf),
                            (dbtoqb(totalinuse)), "", HN_AUTOSCALE,
                            (HN_DECIMAL | HN_B | HN_NOSPACE))) == -1)
                                err(1, "humanize_number");
                        if ((humanize_number(szbuf, sizeof(szbuf),
                            (dbtoqb(totalsize)), "", HN_AUTOSCALE,
                            (HN_DECIMAL | HN_B | HN_NOSPACE))) == -1)
                                err(1, "humanize_number");
                        (void)printf("%s/%s swap space\n", usbuf, szbuf);
                } else {
                        (void)printf("%ld/%ld %s swap space\n",
                                (long)(dbtoqb(totalinuse) / blocksize),
                                (long)(dbtoqb(totalsize) / blocksize),
                                suff);
                }
        } else if (dolong == 0) {
                if (hflag) {
                        if ((humanize_number(szbuf, sizeof(szbuf),
                            (dbtoqb(totalsize)), "", HN_AUTOSCALE,
                            (HN_DECIMAL | HN_B | HN_NOSPACE))) == -1)
                                err(1, "humanize_number");
                        if ((humanize_number(usbuf, sizeof(usbuf),
                            (dbtoqb(totalinuse)), "", HN_AUTOSCALE,
                            (HN_DECIMAL | HN_B | HN_NOSPACE))) == -1)
                                err(1, "humanize_number");
                        if ((humanize_number(avbuf, sizeof(avbuf),
                            (dbtoqb(totalsize-totalinuse)), "", HN_AUTOSCALE,
                            (HN_DECIMAL | HN_B | HN_NOSPACE))) == -1)
                                err(1, "humanize_number");
                        (void)printf(
                            "total: %s allocated, %s used, %s available.\n",
                            szbuf, usbuf, avbuf);
                } else {
                    printf("total: %ld %s allocated, %ld %s used, "
                           "%ld %s available\n",
                    (long)(dbtoqb(totalsize) / blocksize), suff,
                    (long)(dbtoqb(totalinuse) / blocksize), suff,
                    (long)(dbtoqb(totalsize - totalinuse) / blocksize), suff);
                }
        } else if (ncounted > 1) {
                if (hflag) {
                        if ((humanize_number(szbuf, sizeof(szbuf),
                            (dbtoqb(totalsize)), "", HN_AUTOSCALE,
                            (HN_DECIMAL | HN_B | HN_NOSPACE))) == -1)
                                err(1, "humanize_number");
                        if ((humanize_number(usbuf, sizeof(usbuf),
                            (dbtoqb(totalinuse)), "", HN_AUTOSCALE,
                            (HN_DECIMAL | HN_B | HN_NOSPACE))) == -1)
                                err(1, "humanize_number");
                        if ((humanize_number(badbuf, sizeof(badbuf),
                            (pgtoqb(totalbad)), "", HN_AUTOSCALE,
                            (HN_DECIMAL | HN_B | HN_NOSPACE))) == -1)
                                err(1, "humanize_number");
                        if ((humanize_number(avbuf, sizeof(avbuf),
                            (dbtoqb(totalsize-totalinuse)), "", HN_AUTOSCALE,
                            (HN_DECIMAL | HN_B | HN_NOSPACE))) == -1)
                                err(1, "humanize_number");
                        (void)printf("%-*s %*s %*s %*s %*s  %5.0f%%\n",
                            pathmax, "Total", hlen, szbuf, cw, usbuf,
                            cw, badbuf, cw, avbuf,
                            (double)(totalinuse) / (double)totalsize * 100.0);
                } else {
                        (void)printf("%-*s %*ld %*ld %*ld %*ld  %5.0f%%\n",
                            pathmax, "Total", hlen,
                            (long)(dbtoqb(totalsize) / blocksize),
                            cw, (long)(dbtoqb(totalinuse) / blocksize),
                            cw, (long)(pgtoqb(totalbad) / blocksize), cw,
                            (long)(dbtoqb(totalsize - totalinuse) / blocksize),
                            (double)(totalinuse) / (double)totalsize * 100.0);
                }
        }
        if (fsep)
                (void)free(fsep);

        return 1;
}