/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (c) 1994, 1995 Gordon W. Ross
 * Copyright (c) 1994 Theo de Raadt
 * All rights reserved.
 * Copyright (c) 1987, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Symmetric Computer Systems.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 *      This product includes software developed by Theo de Raadt.
 * 4. 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.
 *
 *      from: $NetBSD: disksubr.c,v 1.13 2000/12/17 22:39:18 pk $
 */

#include <sys/param.h>
#include <stdint.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/disk.h>
#define DKTYPENAMES
#define FSTYPENAMES
#define MAXPARTITIONS   8 /* XXX should be 20, but see PR276517 */
#include <sys/disklabel.h>

#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <libgeom.h>
#include <stdlib.h>
#include <signal.h>
#include <stdarg.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>

#include "pathnames.h"

static void     makelabel(const char *, struct disklabel *);
static int      geom_class_available(const char *);
static int      writelabel(void);
static int      readlabel(int flag);
static void     display(FILE *, const struct disklabel *);
static int      edit(void);
static int      editit(void);
static void     fixlabel(struct disklabel *);
static char     *skip(char *);
static char     *word(char *);
static int      getasciilabel(FILE *, struct disklabel *);
static int      getasciipartspec(char *, struct disklabel *, int, int);
static int      checklabel(struct disklabel *);
static void     usage(void);
static struct disklabel *getvirginlabel(void);

#define DEFEDITOR       _PATH_VI
#define DEFPARTITIONS   8

static char     *specname;
static char     *pname;
static char     tmpfil[] = PATH_TMPFILE;

static struct   disklabel lab;
static u_char   bootarea[BBSIZE];
static off_t    mediasize;
static ssize_t  secsize;
static char     blank[] = "";
static char     unknown[] = "unknown";

#define MAX_PART ('z')
#define MAX_NUM_PARTS (1 + MAX_PART - 'a')
static char    part_size_type[MAX_NUM_PARTS];
static char    part_offset_type[MAX_NUM_PARTS];
static int     part_set[MAX_NUM_PARTS];

static int      installboot;    /* non-zero if we should install a boot program */
static int      allfields;      /* present all fields in edit */
static char const *xxboot;      /* primary boot */

static uint32_t lba_offset;
#ifndef LABELSECTOR
#define LABELSECTOR -1
#endif
#ifndef LABELOFFSET
#define LABELOFFSET -1
#endif
static int labelsoffset = LABELSECTOR;
static int labeloffset = LABELOFFSET;
static int bbsize = BBSIZE;

static enum {
        UNSPEC, EDIT, READ, RESTORE, WRITE, WRITEBOOT
} op = UNSPEC;


static int      disable_write;   /* set to disable writing to disk label */
static int      is_file;        /* work on a file (abs. pathname), "-f" opt. */

int
main(int argc, char *argv[])
{
        FILE *t;
        int ch, error, fd;
        const char *name;

        error = 0;
        name = NULL;

        fprintf(stderr,
            "WARNING: bsdlabel is deprecated and is not available in FreeBSD 16 or later.\n"
            "Please use gpart instead.\n\n");

        while ((ch = getopt(argc, argv, "ABb:efm:nRrw")) != -1)
                switch (ch) {
                        case 'A':
                                allfields = 1;
                                break;
                        case 'B':
                                ++installboot;
                                break;
                        case 'b':
                                xxboot = optarg;
                                break;
                        case 'f':
                                is_file=1;
                                break;
                        case 'm':
                                if (!strcmp(optarg, "i386") ||
                                    !strcmp(optarg, "amd64")) {
                                        labelsoffset = 1;
                                        labeloffset = 0;
                                        bbsize = 8192;
                                } else {
                                        errx(1, "Unsupported architecture");
                                }
                                break;
                        case 'n':
                                disable_write = 1;
                                break;
                        case 'R':
                                if (op != UNSPEC)
                                        usage();
                                op = RESTORE;
                                break;
                        case 'e':
                                if (op != UNSPEC)
                                        usage();
                                op = EDIT;
                                break;
                        case 'r':
                                /*
                                 * We accept and ignore -r for compatibility with
                                 * historical disklabel usage.
                                 */
                                break;
                        case 'w':
                                if (op != UNSPEC)
                                        usage();
                                op = WRITE;
                                break;
                        case '?':
                        default:
                                usage();
                }
        argc -= optind;
        argv += optind;

        if (argc < 1)
                usage();
        if (labelsoffset < 0 || labeloffset < 0)
                errx(1, "a -m <architecture> option must be specified");

        /* Figure out the names of the thing we're working on */
        if (is_file) {
                specname = argv[0];
        } else {
                specname = g_device_path(argv[0]);
                if (specname == NULL) {
                        warn("unable to get correct path for %s", argv[0]);
                        return(1);
                }
                fd = open(specname, O_RDONLY);
                if (fd < 0) {
                        warn("error opening %s", specname);
                        return(1);
                }
                pname = g_providername(fd);
                if (pname == NULL) {
                        warn("error getting providername for %s", specname);
                        close(fd);
                        return(1);
                }
                close(fd);
        }

        if (installboot && op == UNSPEC)
                op = WRITEBOOT;
        else if (op == UNSPEC)
                op = READ;

        switch(op) {

        case UNSPEC:
                break;

        case EDIT:
                if (argc != 1)
                        usage();
                readlabel(1);
                fixlabel(&lab);
                error = edit();
                break;

        case READ:
                if (argc != 1)
                        usage();
                readlabel(1);
                display(stdout, NULL);
                error = checklabel(NULL);
                break;

        case RESTORE:
                if (argc != 2)
                        usage();
                if (!(t = fopen(argv[1], "r")))
                        err(4, "fopen %s", argv[1]);
                readlabel(0);
                if (!getasciilabel(t, &lab))
                        exit(1);
                error = writelabel();
                break;

        case WRITE:
                if (argc == 2)
                        name = argv[1];
                else if (argc == 1)
                        name = "auto";
                else
                        usage();
                readlabel(0);
                makelabel(name, &lab);
                fixlabel(&lab);
                if (checklabel(NULL) == 0)
                        error = writelabel();
                break;

        case WRITEBOOT:

                readlabel(1);
                fixlabel(&lab);
                if (argc == 2)
                        makelabel(argv[1], &lab);
                if (checklabel(NULL) == 0)
                        error = writelabel();
                break;
        }
        exit(error);
}

static void
fixlabel(struct disklabel *lp)
{
        struct partition *dp;
        int i;

        for (i = 0; i < lp->d_npartitions; i++) {
                if (i == RAW_PART)
                        continue;
                if (lp->d_partitions[i].p_size)
                        return;
        }

        dp = &lp->d_partitions[0];
        dp->p_offset = BBSIZE / secsize;
        dp->p_size = lp->d_secperunit - dp->p_offset;
}

/*
 * Construct a prototype disklabel from /etc/disktab.
 */
static void
makelabel(const char *type, struct disklabel *lp)
{
        struct disklabel *dp;

        if (strcmp(type, "auto") == 0)
                dp = getvirginlabel();
        else
                dp = getdiskbyname(type);
        if (dp == NULL)
                errx(1, "%s: unknown disk type", type);
        *lp = *dp;
        bzero(lp->d_packname, sizeof(lp->d_packname));
}

static void
readboot(void)
{
        int fd;
        struct stat st;

        if (xxboot == NULL)
                xxboot = "/boot/boot";
        fd = open(xxboot, O_RDONLY);
        if (fd < 0)
                err(1, "cannot open %s", xxboot);
        fstat(fd, &st);
        if (st.st_size <= BBSIZE) {
                if (read(fd, bootarea, st.st_size) != st.st_size)
                        err(1, "read error %s", xxboot);
                close(fd);
                return;
        }
        errx(1, "boot code %s is wrong size", xxboot);
}

static int
geom_class_available(const char *name)
{
        struct gclass *class;
        struct gmesh mesh;
        int error;

        error = geom_gettree(&mesh);
        if (error != 0)
                errc(1, error, "Cannot get GEOM tree");

        LIST_FOREACH(class, &mesh.lg_class, lg_class) {
                if (strcmp(class->lg_name, name) == 0) {
                        geom_deletetree(&mesh);
                        return (1);
                }
        }

        geom_deletetree(&mesh);

        return (0);
}

static int
writelabel(void)
{
        int i, fd, serrno;
        struct disklabel *lp = &lab;

        if (disable_write) {
                warnx("write to disk label suppressed - label was as follows:");
                display(stdout, NULL);
                return (0);
        }

        lp->d_magic = DISKMAGIC;
        lp->d_magic2 = DISKMAGIC;
        lp->d_checksum = 0;
        lp->d_checksum = dkcksum(lp);
        if (installboot)
                readboot();
        for (i = 0; i < lab.d_npartitions; i++)
                if (lab.d_partitions[i].p_size)
                        lab.d_partitions[i].p_offset += lba_offset;
        bsd_disklabel_le_enc(bootarea + labeloffset + labelsoffset * lab.d_secsize,
            lp);

        fd = open(specname, O_RDWR);
        if (fd < 0) {
                if (is_file) {
                        warn("cannot open file %s for writing label", specname);
                        return(1);
                } else
                        serrno = errno;

                if (geom_class_available("PART") != 0) {
                        /*
                         * Since we weren't able open provider for
                         * writing, then recommend user to use gpart(8).
                         */
                        warnc(serrno,
                            "cannot open provider %s for writing label",
                            specname);
                        warnx("Try to use gpart(8).");
                        return (1);
                }

                warnc(serrno, "%s", specname);
                return (1);
        } else {
                if (write(fd, bootarea, bbsize) != bbsize) {
                        warn("write %s", specname);
                        close (fd);
                        return (1);
                }
                close (fd);
        }
        return (0);
}

static void
get_file_parms(int f)
{
        int i;
        struct stat sb;

        if (fstat(f, &sb) != 0)
                err(4, "fstat failed");
        i = sb.st_mode & S_IFMT;
        if (i != S_IFREG && i != S_IFLNK)
                errx(4, "%s is not a valid file or link", specname);
        secsize = DEV_BSIZE;
        mediasize = sb.st_size;
}

/*
 * Fetch disklabel for disk.
 */
static int
readlabel(int flag)
{
        ssize_t nbytes;
        uint32_t lba;
        int f, i;
        int error;

        f = open(specname, O_RDONLY);
        if (f < 0)
                err(1, "%s", specname);
        if (is_file)
                get_file_parms(f);
        else {
                mediasize = g_mediasize(f);
                secsize = g_sectorsize(f);
                if (secsize < 0 || mediasize < 0)
                        err(4, "cannot get disk geometry");
        }
        if (mediasize > (off_t)0xffffffff * secsize)
                errx(1,
                    "disks with more than 2^32-1 sectors are not supported");
        (void)lseek(f, (off_t)0, SEEK_SET);
        nbytes = read(f, bootarea, BBSIZE);
        if (nbytes == -1)
                err(4, "%s read", specname);
        if (nbytes != BBSIZE)
                errx(4, "couldn't read %d bytes from %s", BBSIZE, specname);
        close (f);
        error = bsd_disklabel_le_dec(
            bootarea + (labeloffset + labelsoffset * secsize),
            &lab, MAXPARTITIONS);
        if (flag && error)
                errx(1, "%s: no valid label found", specname);

        if (is_file)
                return(0);

        /*
         * Compensate for absolute block addressing by finding the
         * smallest partition offset and if the offset of the 'c'
         * partition is equal to that, subtract it from all offsets.
         */
        lba = ~0;
        for (i = 0; i < lab.d_npartitions; i++) {
                if (lab.d_partitions[i].p_size)
                        lba = MIN(lba, lab.d_partitions[i].p_offset);
        }
        if (lba != 0 && lab.d_partitions[RAW_PART].p_offset == lba) {
                for (i = 0; i < lab.d_npartitions; i++) {
                        if (lab.d_partitions[i].p_size)
                                lab.d_partitions[i].p_offset -= lba;
                }
                /*
                 * Save the offset so that we can write the label
                 * back with absolute block addresses.
                 */
                lba_offset = lba;
        }
        return (error);
}


static void
display(FILE *f, const struct disklabel *lp)
{
        int i, j;
        const struct partition *pp;

        if (lp == NULL)
                lp = &lab;

        fprintf(f, "# %s:\n", specname);
        if (allfields) {
                if (lp->d_type < DKMAXTYPES)
                        fprintf(f, "type: %s\n", dktypenames[lp->d_type]);
                else
                        fprintf(f, "type: %u\n", lp->d_type);
                fprintf(f, "disk: %.*s\n", (int)sizeof(lp->d_typename),
                        lp->d_typename);
                fprintf(f, "label: %.*s\n", (int)sizeof(lp->d_packname),
                        lp->d_packname);
                fprintf(f, "flags:");
                if (lp->d_flags & D_REMOVABLE)
                        fprintf(f, " removeable");
                if (lp->d_flags & D_ECC)
                        fprintf(f, " ecc");
                if (lp->d_flags & D_BADSECT)
                        fprintf(f, " badsect");
                fprintf(f, "\n");
                fprintf(f, "bytes/sector: %lu\n", (u_long)lp->d_secsize);
                fprintf(f, "sectors/track: %lu\n", (u_long)lp->d_nsectors);
                fprintf(f, "tracks/cylinder: %lu\n", (u_long)lp->d_ntracks);
                fprintf(f, "sectors/cylinder: %lu\n", (u_long)lp->d_secpercyl);
                fprintf(f, "cylinders: %lu\n", (u_long)lp->d_ncylinders);
                fprintf(f, "sectors/unit: %lu\n", (u_long)lp->d_secperunit);
                fprintf(f, "rpm: %u\n", lp->d_rpm);
                fprintf(f, "interleave: %u\n", lp->d_interleave);
                fprintf(f, "trackskew: %u\n", lp->d_trackskew);
                fprintf(f, "cylinderskew: %u\n", lp->d_cylskew);
                fprintf(f, "headswitch: %lu\t\t# milliseconds\n",
                    (u_long)lp->d_headswitch);
                fprintf(f, "track-to-track seek: %ld\t# milliseconds\n",
                    (u_long)lp->d_trkseek);
                fprintf(f, "drivedata: ");
                for (i = NDDATA - 1; i >= 0; i--)
                        if (lp->d_drivedata[i])
                                break;
                if (i < 0)
                        i = 0;
                for (j = 0; j <= i; j++)
                        fprintf(f, "%lu ", (u_long)lp->d_drivedata[j]);
                fprintf(f, "\n\n");
        }
        fprintf(f, "%u partitions:\n", lp->d_npartitions);
        fprintf(f,
            "#          size     offset    fstype   [fsize bsize bps/cpg]\n");
        pp = lp->d_partitions;
        for (i = 0; i < lp->d_npartitions; i++, pp++) {
                if (pp->p_size) {
                        fprintf(f, "  %c: %10lu %10lu  ", 'a' + i,
                           (u_long)pp->p_size, (u_long)pp->p_offset);
                        if (pp->p_fstype < FSMAXTYPES)
                                fprintf(f, "%8.8s", fstypenames[pp->p_fstype]);
                        else
                                fprintf(f, "%8d", pp->p_fstype);
                        switch (pp->p_fstype) {

                        case FS_UNUSED:                         /* XXX */
                                fprintf(f, "    %5lu %5lu %2s",
                                    (u_long)pp->p_fsize,
                                    (u_long)(pp->p_fsize * pp->p_frag), "");
                                break;

                        case FS_BSDFFS:
                                fprintf(f, "    %5lu %5lu %5u",
                                    (u_long)pp->p_fsize,
                                    (u_long)(pp->p_fsize * pp->p_frag),
                                    pp->p_cpg);
                                break;

                        case FS_BSDLFS:
                                fprintf(f, "    %5lu %5lu %5d",
                                    (u_long)pp->p_fsize,
                                    (u_long)(pp->p_fsize * pp->p_frag),
                                    pp->p_cpg);
                                break;

                        default:
                                fprintf(f, "%20.20s", "");
                                break;
                        }
                        if (i == RAW_PART) {
                                fprintf(f, "  # \"raw\" part, don't edit");
                        }
                        fprintf(f, "\n");
                }
        }
        fflush(f);
}

static int
edit(void)
{
        int c, fd;
        struct disklabel label;
        FILE *fp;

        if ((fd = mkstemp(tmpfil)) == -1 ||
            (fp = fdopen(fd, "w")) == NULL) {
                warnx("can't create %s", tmpfil);
                return (1);
        }
        display(fp, NULL);
        fclose(fp);
        for (;;) {
                if (!editit())
                        break;
                fp = fopen(tmpfil, "r");
                if (fp == NULL) {
                        warnx("can't reopen %s for reading", tmpfil);
                        break;
                }
                bzero((char *)&label, sizeof(label));
                c = getasciilabel(fp, &label);
                fclose(fp);
                if (c) {
                        lab = label;
                        if (writelabel() == 0) {
                                (void) unlink(tmpfil);
                                return (0);
                        }
                }
                printf("re-edit the label? [y]: ");
                fflush(stdout);
                c = getchar();
                if (c != EOF && c != (int)'\n')
                        while (getchar() != (int)'\n')
                                ;
                if  (c == (int)'n')
                        break;
        }
        (void) unlink(tmpfil);
        return (1);
}

static int
editit(void)
{
        int pid, xpid;
        int locstat, omask;
        const char *ed;
        uid_t uid;
        gid_t gid;

        omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
        while ((pid = fork()) < 0) {
                if (errno == EPROCLIM) {
                        warnx("you have too many processes");
                        return(0);
                }
                if (errno != EAGAIN) {
                        warn("fork");
                        return(0);
                }
                sleep(1);
        }
        if (pid == 0) {
                sigsetmask(omask);
                gid = getgid();
                if (setresgid(gid, gid, gid) == -1)
                        err(1, "setresgid");
                uid = getuid();
                if (setresuid(uid, uid, uid) == -1)
                        err(1, "setresuid");
                if ((ed = getenv("EDITOR")) == (char *)0)
                        ed = DEFEDITOR;
                execlp(ed, ed, tmpfil, (char *)0);
                err(1, "%s", ed);
        }
        while ((xpid = wait(&locstat)) >= 0)
                if (xpid == pid)
                        break;
        sigsetmask(omask);
        return(!locstat);
}

static char *
skip(char *cp)
{

        while (*cp != '\0' && isspace(*cp))
                cp++;
        if (*cp == '\0' || *cp == '#')
                return (NULL);
        return (cp);
}

static char *
word(char *cp)
{
        char c;

        while (*cp != '\0' && !isspace(*cp) && *cp != '#')
                cp++;
        if ((c = *cp) != '\0') {
                *cp++ = '\0';
                if (c != '#')
                        return (skip(cp));
        }
        return (NULL);
}

/*
 * Read an ascii label in from fd f,
 * in the same format as that put out by display(),
 * and fill in lp.
 */
static int
getasciilabel(FILE *f, struct disklabel *lp)
{
        char *cp, *endp;
        const char **cpp;
        u_int part;
        char *tp, line[BUFSIZ];
        u_long v;
        int lineno = 0, errors = 0;
        int i;

        makelabel("auto", lp);
        bzero(&part_set, sizeof(part_set));
        bzero(&part_size_type, sizeof(part_size_type));
        bzero(&part_offset_type, sizeof(part_offset_type));
        lp->d_bbsize = BBSIZE;                          /* XXX */
        lp->d_sbsize = 0;                               /* XXX */
        while (fgets(line, sizeof(line) - 1, f)) {
                lineno++;
                if ((cp = strchr(line,'\n')) != NULL)
                        *cp = '\0';
                cp = skip(line);
                if (cp == NULL)
                        continue;
                tp = strchr(cp, ':');
                if (tp == NULL) {
                        fprintf(stderr, "line %d: syntax error\n", lineno);
                        errors++;
                        continue;
                }
                *tp++ = '\0', tp = skip(tp);
                if (!strcmp(cp, "type")) {
                        if (tp == NULL)
                                tp = unknown;
                        cpp = dktypenames;
                        for (; cpp < &dktypenames[DKMAXTYPES]; cpp++)
                                if (*cpp && !strcmp(*cpp, tp)) {
                                        lp->d_type = cpp - dktypenames;
                                        break;
                                }
                        if (cpp < &dktypenames[DKMAXTYPES])
                                continue;
                        errno = 0;
                        v = strtoul(tp, &endp, 10);
                        if (errno != 0 || *endp != '\0')
                                v = DKMAXTYPES;
                        if (v >= DKMAXTYPES)
                                fprintf(stderr, "line %d:%s %lu\n", lineno,
                                    "Warning, unknown disk type", v);
                        else
                                lp->d_type = v;
                        continue;
                }
                if (!strcmp(cp, "flags")) {
                        for (v = 0; (cp = tp) && *cp != '\0';) {
                                tp = word(cp);
                                if (!strcmp(cp, "removeable"))
                                        v |= D_REMOVABLE;
                                else if (!strcmp(cp, "ecc"))
                                        v |= D_ECC;
                                else if (!strcmp(cp, "badsect"))
                                        v |= D_BADSECT;
                                else {
                                        fprintf(stderr,
                                            "line %d: %s: bad flag\n",
                                            lineno, cp);
                                        errors++;
                                }
                        }
                        lp->d_flags = v;
                        continue;
                }
                if (!strcmp(cp, "drivedata")) {
                        for (i = 0; (cp = tp) && *cp != '\0' && i < NDDATA;) {
                                lp->d_drivedata[i++] = strtoul(cp, NULL, 10);
                                tp = word(cp);
                        }
                        continue;
                }
                if (sscanf(cp, "%lu partitions", &v) == 1) {
                        if (v > MAXPARTITIONS) {
                                fprintf(stderr,
                                    "line %d: bad # of partitions\n", lineno);
                                lp->d_npartitions = MAXPARTITIONS;
                                errors++;
                        } else if (v < DEFPARTITIONS) {
                                fprintf(stderr,
                                    "line %d: bad # of partitions\n", lineno);
                                lp->d_npartitions = DEFPARTITIONS;
                                errors++;
                        } else
                                lp->d_npartitions = v;
                        continue;
                }
                if (tp == NULL)
                        tp = blank;
                if (!strcmp(cp, "disk")) {
                        strncpy(lp->d_typename, tp, sizeof (lp->d_typename));
                        continue;
                }
                if (!strcmp(cp, "label")) {
                        strncpy(lp->d_packname, tp, sizeof (lp->d_packname));
                        continue;
                }
                if (!strcmp(cp, "bytes/sector")) {
                        v = strtoul(tp, NULL, 10);
                        if (v == 0 || (v % DEV_BSIZE) != 0) {
                                fprintf(stderr,
                                    "line %d: %s: bad sector size\n",
                                    lineno, tp);
                                errors++;
                        } else
                                lp->d_secsize = v;
                        continue;
                }
                if (!strcmp(cp, "sectors/track")) {
                        v = strtoul(tp, NULL, 10);
#if (ULONG_MAX != 0xffffffffUL)
                        if (v == 0 || v > 0xffffffff)
#else
                        if (v == 0)
#endif
                        {
                                fprintf(stderr, "line %d: %s: bad %s\n",
                                    lineno, tp, cp);
                                errors++;
                        } else
                                lp->d_nsectors = v;
                        continue;
                }
                if (!strcmp(cp, "sectors/cylinder")) {
                        v = strtoul(tp, NULL, 10);
                        if (v == 0) {
                                fprintf(stderr, "line %d: %s: bad %s\n",
                                    lineno, tp, cp);
                                errors++;
                        } else
                                lp->d_secpercyl = v;
                        continue;
                }
                if (!strcmp(cp, "tracks/cylinder")) {
                        v = strtoul(tp, NULL, 10);
                        if (v == 0) {
                                fprintf(stderr, "line %d: %s: bad %s\n",
                                    lineno, tp, cp);
                                errors++;
                        } else
                                lp->d_ntracks = v;
                        continue;
                }
                if (!strcmp(cp, "cylinders")) {
                        v = strtoul(tp, NULL, 10);
                        if (v == 0) {
                                fprintf(stderr, "line %d: %s: bad %s\n",
                                    lineno, tp, cp);
                                errors++;
                        } else
                                lp->d_ncylinders = v;
                        continue;
                }
                if (!strcmp(cp, "sectors/unit")) {
                        v = strtoul(tp, NULL, 10);
                        if (v == 0) {
                                fprintf(stderr, "line %d: %s: bad %s\n",
                                    lineno, tp, cp);
                                errors++;
                        } else
                                lp->d_secperunit = v;
                        continue;
                }
                if (!strcmp(cp, "rpm")) {
                        v = strtoul(tp, NULL, 10);
                        if (v == 0 || v > USHRT_MAX) {
                                fprintf(stderr, "line %d: %s: bad %s\n",
                                    lineno, tp, cp);
                                errors++;
                        } else
                                lp->d_rpm = v;
                        continue;
                }
                if (!strcmp(cp, "interleave")) {
                        v = strtoul(tp, NULL, 10);
                        if (v == 0 || v > USHRT_MAX) {
                                fprintf(stderr, "line %d: %s: bad %s\n",
                                    lineno, tp, cp);
                                errors++;
                        } else
                                lp->d_interleave = v;
                        continue;
                }
                if (!strcmp(cp, "trackskew")) {
                        v = strtoul(tp, NULL, 10);
                        if (v > USHRT_MAX) {
                                fprintf(stderr, "line %d: %s: bad %s\n",
                                    lineno, tp, cp);
                                errors++;
                        } else
                                lp->d_trackskew = v;
                        continue;
                }
                if (!strcmp(cp, "cylinderskew")) {
                        v = strtoul(tp, NULL, 10);
                        if (v > USHRT_MAX) {
                                fprintf(stderr, "line %d: %s: bad %s\n",
                                    lineno, tp, cp);
                                errors++;
                        } else
                                lp->d_cylskew = v;
                        continue;
                }
                if (!strcmp(cp, "headswitch")) {
                        v = strtoul(tp, NULL, 10);
                        lp->d_headswitch = v;
                        continue;
                }
                if (!strcmp(cp, "track-to-track seek")) {
                        v = strtoul(tp, NULL, 10);
                        lp->d_trkseek = v;
                        continue;
                }
                /* the ':' was removed above */
                if (*cp < 'a' || *cp > MAX_PART || cp[1] != '\0') {
                        fprintf(stderr,
                            "line %d: %s: Unknown disklabel field\n", lineno,
                            cp);
                        errors++;
                        continue;
                }

                /* Process a partition specification line. */
                part = *cp - 'a';
                if (part >= lp->d_npartitions) {
                        fprintf(stderr,
                            "line %d: partition name out of range a-%c: %s\n",
                            lineno, 'a' + lp->d_npartitions - 1, cp);
                        errors++;
                        continue;
                }
                part_set[part] = 1;

                if (getasciipartspec(tp, lp, part, lineno) != 0) {
                        errors++;
                        break;
                }
        }
        errors += checklabel(lp);
        return (errors == 0);
}

#define NXTNUM(n) do { \
        if (tp == NULL) { \
                fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
                return (1); \
        } else { \
                cp = tp, tp = word(cp); \
                (n) = strtoul(cp, NULL, 10); \
        } \
} while (0)

/* retain 1 character following number */
#define NXTWORD(w,n) do { \
        if (tp == NULL) { \
                fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
                return (1); \
        } else { \
                char *tmp; \
                cp = tp, tp = word(cp); \
                (n) = strtoul(cp, &tmp, 10); \
                if (tmp) (w) = *tmp; \
        } \
} while (0)

/*
 * Read a partition line into partition `part' in the specified disklabel.
 * Return 0 on success, 1 on failure.
 */
static int
getasciipartspec(char *tp, struct disklabel *lp, int part, int lineno)
{
        struct partition *pp;
        char *cp, *endp;
        const char **cpp;
        u_long v;

        pp = &lp->d_partitions[part];
        cp = NULL;

        v = 0;
        NXTWORD(part_size_type[part],v);
        if (v == 0 && part_size_type[part] != '*') {
                fprintf(stderr,
                    "line %d: %s: bad partition size\n", lineno, cp);
                return (1);
        }
        pp->p_size = v;

        v = 0;
        NXTWORD(part_offset_type[part],v);
        if (v == 0 && part_offset_type[part] != '*' &&
            part_offset_type[part] != '\0') {
                fprintf(stderr,
                    "line %d: %s: bad partition offset\n", lineno, cp);
                return (1);
        }
        pp->p_offset = v;
        if (tp == NULL) {
                fprintf(stderr, "line %d: missing file system type\n", lineno);
                return (1);
        }
        cp = tp, tp = word(cp);
        for (cpp = fstypenames; cpp < &fstypenames[FSMAXTYPES]; cpp++)
                if (*cpp && !strcmp(*cpp, cp))
                        break;
        if (*cpp != NULL) {
                pp->p_fstype = cpp - fstypenames;
        } else {
                if (isdigit(*cp)) {
                        errno = 0;
                        v = strtoul(cp, &endp, 10);
                        if (errno != 0 || *endp != '\0')
                                v = FSMAXTYPES;
                } else
                        v = FSMAXTYPES;
                if (v >= FSMAXTYPES) {
                        fprintf(stderr,
                            "line %d: Warning, unknown file system type %s\n",
                            lineno, cp);
                        v = FS_UNUSED;
                }
                pp->p_fstype = v;
        }

        switch (pp->p_fstype) {
        case FS_UNUSED:
        case FS_BSDFFS:
        case FS_BSDLFS:
                /* accept defaults for fsize/frag/cpg */
                if (tp) {
                        NXTNUM(pp->p_fsize);
                        if (pp->p_fsize == 0)
                                break;
                        NXTNUM(v);
                        pp->p_frag = v / pp->p_fsize;
                        if (tp != NULL)
                                NXTNUM(pp->p_cpg);
                }
                /* else default to 0's */
                break;
        default:
                break;
        }
        return (0);
}

/*
 * Check disklabel for errors and fill in
 * derived fields according to supplied values.
 */
static int
checklabel(struct disklabel *lp)
{
        struct partition *pp;
        int i, errors = 0;
        char part;
        u_long base_offset, needed, total_percent, current_offset;
        long free_space;
        int seen_default_offset;
        int hog_part;
        int j;
        struct partition *pp2;

        if (lp == NULL)
                lp = &lab;

        if (allfields) {

                if (lp->d_secsize == 0) {
                        fprintf(stderr, "sector size 0\n");
                        return (1);
                }
                if (lp->d_nsectors == 0) {
                        fprintf(stderr, "sectors/track 0\n");
                        return (1);
                }
                if (lp->d_ntracks == 0) {
                        fprintf(stderr, "tracks/cylinder 0\n");
                        return (1);
                }
                if  (lp->d_ncylinders == 0) {
                        fprintf(stderr, "cylinders/unit 0\n");
                        errors++;
                }
                if (lp->d_rpm == 0)
                        warnx("revolutions/minute 0");
                if (lp->d_secpercyl == 0)
                        lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
                if (lp->d_secperunit == 0)
                        lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders;
                if (lp->d_bbsize == 0) {
                        fprintf(stderr, "boot block size 0\n");
                        errors++;
                } else if (lp->d_bbsize % lp->d_secsize)
                        warnx("boot block size %% sector-size != 0");
                if (lp->d_npartitions > MAXPARTITIONS) {
                        warnx("number of partitions (%lu) > MAXPARTITIONS (%d)",
                            (u_long)lp->d_npartitions, MAXPARTITIONS);
                        errors++;
                }
                if (lp->d_npartitions < DEFPARTITIONS) {
                        warnx("number of partitions (%lu) < DEFPARTITIONS (%d)",
                            (u_long)lp->d_npartitions, DEFPARTITIONS);
                        errors++;
                }
        } else {
                struct disklabel *vl;

                vl = getvirginlabel();
                if (lp->d_secsize == 0)
                        lp->d_secsize = vl->d_secsize;
                if (lp->d_nsectors == 0)
                        lp->d_nsectors = vl->d_nsectors;
                if (lp->d_ntracks == 0)
                        lp->d_ntracks = vl->d_ntracks;
                if (lp->d_ncylinders == 0)
                        lp->d_ncylinders = vl->d_ncylinders;
                if (lp->d_rpm == 0)
                        lp->d_rpm = vl->d_rpm;
                if (lp->d_interleave == 0)
                        lp->d_interleave = vl->d_interleave;
                if (lp->d_secpercyl == 0)
                        lp->d_secpercyl = vl->d_secpercyl;
                if (lp->d_secperunit == 0 ||
                    lp->d_secperunit > vl->d_secperunit)
                        lp->d_secperunit = vl->d_secperunit;
                if (lp->d_bbsize == 0)
                        lp->d_bbsize = vl->d_bbsize;
                if (lp->d_npartitions < DEFPARTITIONS ||
                    lp->d_npartitions > MAXPARTITIONS)
                        lp->d_npartitions = vl->d_npartitions;
        }


        /* first allocate space to the partitions, then offsets */
        total_percent = 0; /* in percent */
        hog_part = -1;
        /* find all fixed partitions */
        for (i = 0; i < lp->d_npartitions; i++) {
                pp = &lp->d_partitions[i];
                if (part_set[i]) {
                        if (part_size_type[i] == '*') {
                                if (i == RAW_PART) {
                                        pp->p_size = lp->d_secperunit;
                                } else {
                                        if (hog_part != -1)
                                                warnx("Too many '*' partitions (%c and %c)",
                                                    hog_part + 'a',i + 'a');
                                        else
                                                hog_part = i;
                                }
                        } else {
                                off_t size;

                                size = pp->p_size;
                                switch (part_size_type[i]) {
                                case '%':
                                        total_percent += size;
                                        break;
                                case 't':
                                case 'T':
                                        size *= 1024ULL;
                                        /* FALLTHROUGH */
                                case 'g':
                                case 'G':
                                        size *= 1024ULL;
                                        /* FALLTHROUGH */
                                case 'm':
                                case 'M':
                                        size *= 1024ULL;
                                        /* FALLTHROUGH */
                                case 'k':
                                case 'K':
                                        size *= 1024ULL;
                                        break;
                                case '\0':
                                        break;
                                default:
                                        warnx("unknown multiplier suffix '%c' for partition %c (should be K, M, G or T)",
                                            part_size_type[i], i + 'a');
                                        break;
                                }
                                /* don't count %'s yet */
                                if (part_size_type[i] != '%') {
                                        /*
                                         * for all not in sectors, convert to
                                         * sectors
                                         */
                                        if (part_size_type[i] != '\0') {
                                                if (size % lp->d_secsize != 0)
                                                        warnx("partition %c not an integer number of sectors",
                                                            i + 'a');
                                                size /= lp->d_secsize;
                                                pp->p_size = size;
                                        }
                                }
                        }
                }
        }

        /* Find out the total free space, excluding the boot block area. */
        base_offset = BBSIZE / secsize;
        free_space = 0;
        for (i = 0; i < lp->d_npartitions; i++) {
                pp = &lp->d_partitions[i];
                if (!part_set[i] || i == RAW_PART ||
                    part_size_type[i] == '%' || part_size_type[i] == '*')
                        continue;
                if (pp->p_offset > base_offset)
                        free_space += pp->p_offset - base_offset;
                if (pp->p_offset + pp->p_size > base_offset)
                        base_offset = pp->p_offset + pp->p_size;
        }
        if (base_offset < lp->d_secperunit)
                free_space += lp->d_secperunit - base_offset;

        /* handle % partitions - note %'s don't need to add up to 100! */
        if (total_percent != 0) {
                if (total_percent > 100) {
                        fprintf(stderr,"total percentage %lu is greater than 100\n",
                            total_percent);
                        errors++;
                }

                if (free_space > 0) {
                        for (i = 0; i < lp->d_npartitions; i++) {
                                pp = &lp->d_partitions[i];
                                if (part_set[i] && part_size_type[i] == '%') {
                                        /* careful of overflows! and integer roundoff */
                                        pp->p_size = ((double)pp->p_size/100) * free_space;

                                        /* FIX we can lose a sector or so due to roundoff per
                                           partition.  A more complex algorithm could avoid that */
                                }
                        }
                } else {
                        fprintf(stderr,
                            "%ld sectors available to give to '*' and '%%' partitions\n",
                            free_space);
                        errors++;
                        /* fix?  set all % partitions to size 0? */
                }
        }
        /* give anything remaining to the hog partition */
        if (hog_part != -1) {
                /*
                 * Find the range of offsets usable by '*' partitions around
                 * the hog partition and how much space they need.
                 */
                needed = 0;
                base_offset = BBSIZE / secsize;
                for (i = hog_part - 1; i >= 0; i--) {
                        pp = &lp->d_partitions[i];
                        if (!part_set[i] || i == RAW_PART)
                                continue;
                        if (part_offset_type[i] == '*') {
                                needed += pp->p_size;
                                continue;
                        }
                        base_offset = pp->p_offset + pp->p_size;
                        break;
                }
                current_offset = lp->d_secperunit;
                for (i = lp->d_npartitions - 1; i > hog_part; i--) {
                        pp = &lp->d_partitions[i];
                        if (!part_set[i] || i == RAW_PART)
                                continue;
                        if (part_offset_type[i] == '*') {
                                needed += pp->p_size;
                                continue;
                        }
                        current_offset = pp->p_offset;
                }

                if (current_offset - base_offset <= needed) {
                        fprintf(stderr, "Cannot find space for partition %c\n",
                            hog_part + 'a');
                        fprintf(stderr,
                            "Need more than %lu sectors between %lu and %lu\n",
                            needed, base_offset, current_offset);
                        errors++;
                        lp->d_partitions[hog_part].p_size = 0;
                } else {
                        lp->d_partitions[hog_part].p_size = current_offset -
                            base_offset - needed;
                }
        }

        /* Now set the offsets for each partition */
        current_offset = BBSIZE / secsize; /* in sectors */
        seen_default_offset = 0;
        for (i = 0; i < lp->d_npartitions; i++) {
                part = 'a' + i;
                pp = &lp->d_partitions[i];
                if (part_set[i]) {
                        if (part_offset_type[i] == '*') {
                                if (i == RAW_PART) {
                                        pp->p_offset = 0;
                                } else {
                                        pp->p_offset = current_offset;
                                        seen_default_offset = 1;
                                }
                        } else {
                                /* allow them to be out of order for old-style tables */
                                if (pp->p_offset < current_offset &&
                                    seen_default_offset && i != RAW_PART &&
                                    pp->p_fstype != FS_VINUM) {
                                        fprintf(stderr,
"Offset %ld for partition %c overlaps previous partition which ends at %lu\n",
                                            (long)pp->p_offset,i+'a',current_offset);
                                        fprintf(stderr,
"Labels with any *'s for offset must be in ascending order by sector\n");
                                        errors++;
                                } else if (pp->p_offset != current_offset &&
                                    i != RAW_PART && seen_default_offset) {
                                        /*
                                         * this may give unneeded warnings if
                                         * partitions are out-of-order
                                         */
                                        warnx(
"Offset %ld for partition %c doesn't match expected value %ld",
                                            (long)pp->p_offset, i + 'a', current_offset);
                                }
                        }
                        if (i != RAW_PART)
                                current_offset = pp->p_offset + pp->p_size;
                }
        }

        for (i = 0; i < lp->d_npartitions; i++) {
                part = 'a' + i;
                pp = &lp->d_partitions[i];
                if (pp->p_size == 0 && pp->p_offset != 0)
                        warnx("partition %c: size 0, but offset %lu",
                            part, (u_long)pp->p_offset);
#ifdef notdef
                if (pp->p_size % lp->d_secpercyl)
                        warnx("partition %c: size %% cylinder-size != 0",
                            part);
                if (pp->p_offset % lp->d_secpercyl)
                        warnx("partition %c: offset %% cylinder-size != 0",
                            part);
#endif
                if (pp->p_offset > lp->d_secperunit) {
                        fprintf(stderr,
                            "partition %c: offset past end of unit\n", part);
                        errors++;
                }
                if (pp->p_offset + pp->p_size > lp->d_secperunit) {
                        fprintf(stderr,
                        "partition %c: partition extends past end of unit\n",
                            part);
                        errors++;
                }
                if (i == RAW_PART) {
                        if (pp->p_fstype != FS_UNUSED)
                                warnx("partition %c is not marked as unused!",part);
                        if (pp->p_offset != 0)
                                warnx("partition %c doesn't start at 0!",part);
                        if (pp->p_size != lp->d_secperunit)
                                warnx("partition %c doesn't cover the whole unit!",part);

                        if ((pp->p_fstype != FS_UNUSED) || (pp->p_offset != 0) ||
                            (pp->p_size != lp->d_secperunit)) {
                                warnx("An incorrect partition %c may cause problems for "
                                    "standard system utilities",part);
                        }
                }

                /* check for overlaps */
                /* this will check for all possible overlaps once and only once */
                for (j = 0; j < i; j++) {
                        pp2 = &lp->d_partitions[j];
                        if (j != RAW_PART && i != RAW_PART &&
                            pp->p_fstype != FS_VINUM &&
                            pp2->p_fstype != FS_VINUM &&
                            part_set[i] && part_set[j]) {
                                if (pp2->p_offset < pp->p_offset + pp->p_size &&
                                    (pp2->p_offset + pp2->p_size > pp->p_offset ||
                                        pp2->p_offset >= pp->p_offset)) {
                                        fprintf(stderr,"partitions %c and %c overlap!\n",
                                            j + 'a', i + 'a');
                                        errors++;
                                }
                        }
                }
        }
        for (; i < lp->d_npartitions; i++) {
                part = 'a' + i;
                pp = &lp->d_partitions[i];
                if (pp->p_size || pp->p_offset)
                        warnx("unused partition %c: size %d offset %lu",
                            'a' + i, pp->p_size, (u_long)pp->p_offset);
        }
        return (errors);
}

/*
 * When operating on a "virgin" disk, try getting an initial label
 * from the associated device driver.  This might work for all device
 * drivers that are able to fetch some initial device parameters
 * without even having access to a (BSD) disklabel, like SCSI disks,
 * most IDE drives, or vn devices.
 *
 * The device name must be given in its "canonical" form.
 */
static struct disklabel *
getvirginlabel(void)
{
        static struct disklabel loclab;
        struct partition *dp;
        int f;
        u_int u;

        if ((f = open(specname, O_RDONLY)) == -1) {
                warn("cannot open %s", specname);
                return (NULL);
        }

        if (is_file)
                get_file_parms(f);
        else {
                mediasize = g_mediasize(f);
                secsize = g_sectorsize(f);
                if (secsize < 0 || mediasize < 0) {
                        close (f);
                        return (NULL);
                }
        }
        memset(&loclab, 0, sizeof loclab);
        loclab.d_magic = DISKMAGIC;
        loclab.d_magic2 = DISKMAGIC;
        loclab.d_secsize = secsize;
        loclab.d_secperunit = mediasize / secsize;

        /*
         * Nobody in these enlightened days uses the CHS geometry for
         * anything, but nonetheless try to get it right.  If we fail
         * to get any good ideas from the device, construct something
         * which is IBM-PC friendly.
         */
        if (ioctl(f, DIOCGFWSECTORS, &u) == 0)
                loclab.d_nsectors = u;
        else
                loclab.d_nsectors = 63;
        if (ioctl(f, DIOCGFWHEADS, &u) == 0)
                loclab.d_ntracks = u;
        else if (loclab.d_secperunit <= 63*1*1024)
                loclab.d_ntracks = 1;
        else if (loclab.d_secperunit <= 63*16*1024)
                loclab.d_ntracks = 16;
        else
                loclab.d_ntracks = 255;
        loclab.d_secpercyl = loclab.d_ntracks * loclab.d_nsectors;
        loclab.d_ncylinders = loclab.d_secperunit / loclab.d_secpercyl;
        loclab.d_npartitions = DEFPARTITIONS;

        /* Various (unneeded) compat stuff */
        loclab.d_rpm = 3600;
        loclab.d_bbsize = BBSIZE;
        loclab.d_interleave = 1;
        strncpy(loclab.d_typename, "amnesiac",
            sizeof(loclab.d_typename));

        dp = &loclab.d_partitions[RAW_PART];
        dp->p_size = loclab.d_secperunit;
        loclab.d_checksum = dkcksum(&loclab);
        close (f);
        return (&loclab);
}

static void
usage(void)
{

        fprintf(stderr,
        "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
        "usage: bsdlabel disk",
        "\t\t(to read label)",
        "       bsdlabel -w [-n] [-m machine] disk [type]",
        "\t\t(to write label with existing boot program)",
        "       bsdlabel -e [-n] [-m machine] disk",
        "\t\t(to edit label)",
        "       bsdlabel -R [-n] [-m machine] disk protofile",
        "\t\t(to restore label with existing boot program)",
        "       bsdlabel -B [-b boot] [-m machine] disk",
        "\t\t(to install boot program with existing on-disk label)",
        "       bsdlabel -w -B [-n] [-b boot] [-m machine] disk [type]",
        "\t\t(to write label and install boot program)",
        "       bsdlabel -R -B [-n] [-b boot] [-m machine] disk protofile",
                "\t\t(to restore label and install boot program)"
        );
        exit(1);
}