/*
 * Copyright (c) 1980, 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Robert Elz at The University of Melbourne.
 *
 * 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, 1990, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)edquota.c        8.1 (Berkeley) 6/6/93
 * $FreeBSD: src/usr.sbin/edquota/edquota.c,v 1.9.2.6 2002/10/31 22:38:43 iedowse Exp $
 */

/*
 * Disk quota editor.
 */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <vfs/ufs/quota.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fstab.h>
#include <grp.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "pathnames.h"

const char *qfname = QUOTAFILENAME;
const char *qfextension[] = INITQFNAMES;
const char *quotagroup = QUOTAGROUP;
char tmpfil[] = _PATH_TMP;

struct quotause {
        struct  quotause *next;
        long    flags;
        struct  ufs_dqblk dqblk;
        char    fsname[MAXPATHLEN + 1];
        char    qfname[1];      /* actually longer */
};
#define FOUND   0x01

int alldigits(const char *s);
int cvtatos(time_t, char *, time_t *);
char *cvtstoa(time_t);
int editit(char *);
void freeprivs(struct quotause *);
int getentry(const char *, int);
struct quotause *getprivs(long, int, char *);
int hasquota(struct fstab *, int, char **);
void putprivs(long, int, struct quotause *);
int readprivs(struct quotause *, char *);
int readtimes(struct quotause *, char *);
static void usage(void);
int writetimes(struct quotause *, int, int);
int writeprivs(struct quotause *, int, char *, int);

int
main(int argc, char **argv)
{
        struct quotause *qup, *protoprivs, *curprivs;
        long id, protoid;
        long long lim;
        int i, quotatype, range, tmpfd;
        uid_t startuid, enduid;
        u_int32_t *limp;
        char *protoname, *cp, *oldoptarg, ch;
        int eflag = 0, tflag = 0, pflag = 0;
        char *fspath = NULL;
        char buf[MAXLOGNAME];

        if (argc < 2)
                usage();
        if (getuid())
                errx(1, "permission denied");
        quotatype = USRQUOTA;
        protoprivs = NULL;
        curprivs = NULL;
        protoname = NULL;
        while ((ch = getopt(argc, argv, "ugtf:p:e:")) != -1) {
                switch(ch) {
                case 'f':
                        fspath = optarg;
                        break;
                case 'p':
                        protoname = optarg;
                        pflag++;
                        break;
                case 'g':
                        quotatype = GRPQUOTA;
                        break;
                case 'u':
                        quotatype = USRQUOTA;
                        break;
                case 't':
                        tflag++;
                        break;
                case 'e':
                        if ((qup = malloc(sizeof(*qup))) == NULL)
                                errx(2, "out of memory");
                        bzero(qup, sizeof(*qup));
                        i = 0;
                        oldoptarg = optarg;
                        for (cp = optarg; (cp = strsep(&optarg, ":")) != NULL;
                            i++) {
                                if (cp != oldoptarg)
                                        *(cp - 1) = ':';
                                limp = NULL;
                                switch (i) {
                                case 0:
                                        strlcpy(qup->fsname, cp,
                                            sizeof(qup->fsname));
                                        break;
                                case 1:
                                        limp = &qup->dqblk.dqb_bsoftlimit;
                                        break;
                                case 2:
                                        limp = &qup->dqblk.dqb_bhardlimit;
                                        break;
                                case 3:
                                        limp = &qup->dqblk.dqb_isoftlimit;
                                        break;
                                case 4:
                                        limp = &qup->dqblk.dqb_ihardlimit;
                                        break;
                                default:
                                        warnx("incorrect quota specification: "
                                            "%s", oldoptarg);
                                        usage();
                                        break; /* XXX: report an error */
                                }
                                if (limp != NULL) {
                                        lim = strtoll(cp, NULL, 10);
                                        if (lim < 0 || lim > UINT_MAX)
                                                errx(1, "invalid limit value: "
                                                    "%lld", lim);
                                        *limp = (u_int32_t)lim;
                                }
                        }
                        qup->dqblk.dqb_bsoftlimit =
                            btodb((off_t)qup->dqblk.dqb_bsoftlimit * 1024);
                        qup->dqblk.dqb_bhardlimit =
                            btodb((off_t)qup->dqblk.dqb_bhardlimit * 1024);
                        if (protoprivs == NULL) {
                                protoprivs = curprivs = qup;
                        } else {
                                curprivs->next = qup;
                                curprivs = qup;
                        }
                        eflag++;
                        pflag++;
                        break;
                default:
                        usage();
                }
        }
        argc -= optind;
        argv += optind;
        if (pflag) {
                if (protoprivs == NULL) {
                        if ((protoid = getentry(protoname, quotatype)) == -1)
                                exit(1);
                        protoprivs = getprivs(protoid, quotatype, fspath);
                        for (qup = protoprivs; qup; qup = qup->next) {
                                qup->dqblk.dqb_btime = 0;
                                qup->dqblk.dqb_itime = 0;
                        }
                }
                for (; argc-- > 0; argv++) {
                        if (strspn(*argv, "0123456789-") == strlen(*argv) &&
                            (cp = strchr(*argv, '-')) != NULL) {
                                *cp++ = '\0';
                                startuid = atoi(*argv);
                                enduid = atoi(cp);
                                if (enduid < startuid)
                                        errx(1,
        "ending uid (%d) must be >= starting uid (%d) when using uid ranges",
                                                enduid, startuid);
                                range = 1;
                        } else {
                                startuid = enduid = 0;
                                range = 0;
                        }
                        for ( ; startuid <= enduid; startuid++) {
                                if (range)
                                        snprintf(buf, sizeof(buf), "%d",
                                            startuid);
                                else
                                        snprintf(buf, sizeof(buf), "%s",
                                                *argv);
                                if ((id = getentry(buf, quotatype)) < 0)
                                        continue;
                                if (eflag) {
                                        for (qup = protoprivs; qup;
                                            qup = qup->next) {
                                                curprivs = getprivs(id,
                                                    quotatype, qup->fsname);
                                                if (curprivs == NULL)
                                                        continue;
                                                strcpy(qup->qfname,
                                                    curprivs->qfname);
                                                strcpy(qup->fsname,
                                                    curprivs->fsname);
                                        }
                                }
                                putprivs(id, quotatype, protoprivs);                                            
                        }
                }
                exit(0);
        }
        tmpfd = mkstemp(tmpfil);
        fchown(tmpfd, getuid(), getgid());
        if (tflag) {
                protoprivs = getprivs(0, quotatype, fspath);
                if (writetimes(protoprivs, tmpfd, quotatype) == 0)
                        exit(1);
                if (editit(tmpfil) && readtimes(protoprivs, tmpfil))
                        putprivs(0, quotatype, protoprivs);
                freeprivs(protoprivs);
                close(tmpfd);
                unlink(tmpfil);
                exit(0);
        }
        for ( ; argc > 0; argc--, argv++) {
                if ((id = getentry(*argv, quotatype)) == -1)
                        continue;
                curprivs = getprivs(id, quotatype, fspath);
                if (writeprivs(curprivs, tmpfd, *argv, quotatype) == 0)
                        continue;
                if (editit(tmpfil) && readprivs(curprivs, tmpfil))
                        putprivs(id, quotatype, curprivs);
                freeprivs(curprivs);
        }
        close(tmpfd);
        unlink(tmpfil);
        exit(0);
}

static void
usage(void)
{
        fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
                "usage: edquota [-u] [-f fspath] [-p username] username ...",
                "       edquota [-u] -e fspath[:bslim[:bhlim[:islim[:ihlim]]]] [-e ...]",
                "               username ...",
                "       edquota -g [-f fspath] [-p groupname] groupname ...",
                "       edquota -g -e fspath[:bslim[:bhlim[:islim[:ihlim]]]] [-e ...]",
                "               groupname ...",
                "       edquota [-u] -t [-f fspath]",
                "       edquota -g -t [-f fspath]");
        exit(1);
}

/*
 * This routine converts a name for a particular quota type to
 * an identifier. This routine must agree with the kernel routine
 * getinoquota as to the interpretation of quota types.
 */
int
getentry(const char *name, int quotatype)
{
        struct passwd *pw;
        struct group *gr;

        if (alldigits(name))
                return (atoi(name));
        switch(quotatype) {
        case USRQUOTA:
                if ((pw = getpwnam(name)))
                        return (pw->pw_uid);
                warnx("%s: no such user", name);
                break;
        case GRPQUOTA:
                if ((gr = getgrnam(name)))
                        return (gr->gr_gid);
                warnx("%s: no such group", name);
                break;
        default:
                warnx("%d: unknown quota type", quotatype);
                break;
        }
        sleep(1);
        return (-1);
}

/*
 * Collect the requested quota information.
 */
struct quotause *
getprivs(long id, int quotatype, char *fspath)
{
        struct fstab *fs;
        struct quotause *qup, *quptail;
        struct quotause *quphead;
        int qcmd, qupsize, fd;
        char *qfpathname;
        static int warned = 0;

        setfsent();
        quphead = quptail = NULL;
        qcmd = QCMD(Q_GETQUOTA, quotatype);
        while ((fs = getfsent())) {
                if (fspath && *fspath && strcmp(fspath, fs->fs_spec) &&
                    strcmp(fspath, fs->fs_file))
                        continue;
                if (strcmp(fs->fs_vfstype, "ufs"))
                        continue;
                if (!hasquota(fs, quotatype, &qfpathname))
                        continue;
                qupsize = sizeof(*qup) + strlen(qfpathname);
                if ((qup = (struct quotause *)malloc(qupsize)) == NULL)
                        errx(2, "out of memory");
                if (quotactl(fs->fs_file, qcmd, id, &qup->dqblk) != 0) {
                        if (errno == EOPNOTSUPP && !warned) {
                                warned++;
                warnx("warning: quotas are not compiled into this kernel");
                                sleep(3);
                        }
                        if ((fd = open(qfpathname, O_RDONLY)) < 0) {
                                fd = open(qfpathname, O_RDWR|O_CREAT, 0640);
                                if (fd < 0 && errno != ENOENT) {
                                        warn("%s", qfpathname);
                                        free(qup);
                                        continue;
                                }
                                warnx("creating quota file %s", qfpathname);
                                sleep(3);
                                fchown(fd, getuid(),
                                    getentry(quotagroup, GRPQUOTA));
                                fchmod(fd, 0640);
                        }
                        lseek(fd, (long)(id * sizeof(struct ufs_dqblk)), L_SET);
                        switch (read(fd, &qup->dqblk, sizeof(struct ufs_dqblk))) {
                        case 0:                 /* EOF */
                                /*
                                 * Convert implicit 0 quota (EOF)
                                 * into an explicit one (zero'ed dqblk)
                                 */
                                bzero((caddr_t)&qup->dqblk,
                                    sizeof(struct ufs_dqblk));
                                break;

                        case sizeof(struct ufs_dqblk):  /* OK */
                                break;

                        default:                /* ERROR */
                                warn("read error in %s", qfpathname);
                                close(fd);
                                free(qup);
                                continue;
                        }
                        close(fd);
                }
                strcpy(qup->qfname, qfpathname);
                strcpy(qup->fsname, fs->fs_file);
                if (quphead == NULL)
                        quphead = qup;
                else
                        quptail->next = qup;
                quptail = qup;
                qup->next = NULL;
        }
        endfsent();
        return (quphead);
}

/*
 * Store the requested quota information.
 */
void
putprivs(long id, int quotatype, struct quotause *quplist)
{
        struct quotause *qup;
        int qcmd, fd;

        qcmd = QCMD(Q_SETQUOTA, quotatype);
        for (qup = quplist; qup; qup = qup->next) {
                if (quotactl(qup->fsname, qcmd, id, &qup->dqblk) == 0)
                        continue;
                if ((fd = open(qup->qfname, O_WRONLY)) < 0) {
                        warn("%s", qup->qfname);
                } else {
                        lseek(fd, (long)id * (long)sizeof(struct ufs_dqblk), 0);
                        if (write(fd, &qup->dqblk, sizeof(struct ufs_dqblk)) !=
                            sizeof(struct ufs_dqblk)) {
                                warn("%s", qup->qfname);
                        }
                        close(fd);
                }
        }
}

/*
 * Take a list of priviledges and get it edited.
 */
int
editit(char *tmpf)
{
        long omask;
        int pid, status;

        omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
 top:
        if ((pid = fork()) < 0) {

                if (errno == EPROCLIM) {
                        warnx("you have too many processes");
                        return(0);
                }
                if (errno == EAGAIN) {
                        sleep(1);
                        goto top;
                }
                warn("fork");
                return (0);
        }
        if (pid == 0) {
                const char *ed;

                sigsetmask(omask);
                setgid(getgid());
                setuid(getuid());
                if ((ed = getenv("EDITOR")) == NULL)
                        ed = _PATH_VI;
                execlp(ed, ed, tmpf, NULL);
                err(1, "%s", ed);
        }
        waitpid(pid, &status, 0);
        sigsetmask(omask);
        if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
                return (0);
        return (1);
}

/*
 * Convert a quotause list to an ASCII file.
 */
int
writeprivs(struct quotause *quplist, int outfd, char *name, int quotatype)
{
        struct quotause *qup;
        FILE *fd;

        ftruncate(outfd, 0);
        lseek(outfd, 0, L_SET);
        if ((fd = fdopen(dup(outfd), "w")) == NULL)
                err(1, "%s", tmpfil);
        fprintf(fd, "Quotas for %s %s:\n", qfextension[quotatype], name);
        for (qup = quplist; qup; qup = qup->next) {
                fprintf(fd, "%s: %s %lu, limits (soft = %lu, hard = %lu)\n",
                    qup->fsname, "kbytes in use:",
                    (unsigned long)(dbtob(qup->dqblk.dqb_curblocks) / 1024),
                    (unsigned long)(dbtob(qup->dqblk.dqb_bsoftlimit) / 1024),
                    (unsigned long)(dbtob(qup->dqblk.dqb_bhardlimit) / 1024));
                fprintf(fd, "%s %lu, limits (soft = %lu, hard = %lu)\n",
                    "\tinodes in use:",
                    (unsigned long)qup->dqblk.dqb_curinodes,
                    (unsigned long)qup->dqblk.dqb_isoftlimit,
                    (unsigned long)qup->dqblk.dqb_ihardlimit);
        }
        fclose(fd);
        return (1);
}

/*
 * Merge changes to an ASCII file into a quotause list.
 */
int
readprivs(struct quotause *quplist, char *inname)
{
        struct quotause *qup;
        FILE *fd;
        unsigned long bhardlimit, bsoftlimit, curblocks;
        unsigned long ihardlimit, isoftlimit, curinodes;
        int cnt;
        char *cp;
        struct ufs_dqblk dqblk;
        char *fsp, line1[BUFSIZ], line2[BUFSIZ];

        fd = fopen(inname, "r");
        if (fd == NULL) {
                warnx("can't re-read temp file!!");
                return (0);
        }
        /*
         * Discard title line, then read pairs of lines to process.
         */
        fgets(line1, sizeof(line1), fd);
        while (fgets(line1, sizeof(line1), fd) != NULL &&
               fgets(line2, sizeof(line2), fd) != NULL) {
                if ((fsp = strtok(line1, " \t:")) == NULL) {
                        warnx("%s: bad format", line1);
                        return (0);
                }
                if ((cp = strtok(NULL, "\n")) == NULL) {
                        warnx("%s: %s: bad format", fsp, &fsp[strlen(fsp) + 1]);
                        return (0);
                }
                cnt = sscanf(cp,
                    " kbytes in use: %lu, limits (soft = %lu, hard = %lu)",
                    &curblocks, &bsoftlimit, &bhardlimit);
                if (cnt != 3) {
                        warnx("%s:%s: bad format", fsp, cp);
                        return (0);
                }
                dqblk.dqb_curblocks = btodb((off_t)curblocks * 1024);
                dqblk.dqb_bsoftlimit = btodb((off_t)bsoftlimit * 1024);
                dqblk.dqb_bhardlimit = btodb((off_t)bhardlimit * 1024);
                if ((cp = strtok(line2, "\n")) == NULL) {
                        warnx("%s: %s: bad format", fsp, line2);
                        return (0);
                }
                cnt = sscanf(cp,
                    "\tinodes in use: %lu, limits (soft = %lu, hard = %lu)",
                    &curinodes, &isoftlimit, &ihardlimit);
                if (cnt != 3) {
                        warnx("%s: %s: bad format", fsp, line2);
                        return (0);
                }
                dqblk.dqb_curinodes = curinodes;
                dqblk.dqb_isoftlimit = isoftlimit;
                dqblk.dqb_ihardlimit = ihardlimit;
                for (qup = quplist; qup; qup = qup->next) {
                        if (strcmp(fsp, qup->fsname))
                                continue;
                        /*
                         * Cause time limit to be reset when the quota
                         * is next used if previously had no soft limit
                         * or were under it, but now have a soft limit
                         * and are over it.
                         */
                        if (dqblk.dqb_bsoftlimit &&
                            qup->dqblk.dqb_curblocks >= dqblk.dqb_bsoftlimit &&
                            (qup->dqblk.dqb_bsoftlimit == 0 ||
                             qup->dqblk.dqb_curblocks <
                             qup->dqblk.dqb_bsoftlimit))
                                qup->dqblk.dqb_btime = 0;
                        if (dqblk.dqb_isoftlimit &&
                            qup->dqblk.dqb_curinodes >= dqblk.dqb_isoftlimit &&
                            (qup->dqblk.dqb_isoftlimit == 0 ||
                             qup->dqblk.dqb_curinodes <
                             qup->dqblk.dqb_isoftlimit))
                                qup->dqblk.dqb_itime = 0;
                        qup->dqblk.dqb_bsoftlimit = dqblk.dqb_bsoftlimit;
                        qup->dqblk.dqb_bhardlimit = dqblk.dqb_bhardlimit;
                        qup->dqblk.dqb_isoftlimit = dqblk.dqb_isoftlimit;
                        qup->dqblk.dqb_ihardlimit = dqblk.dqb_ihardlimit;
                        qup->flags |= FOUND;
                        if (dqblk.dqb_curblocks == qup->dqblk.dqb_curblocks &&
                            dqblk.dqb_curinodes == qup->dqblk.dqb_curinodes)
                                break;
                        warnx("%s: cannot change current allocation", fsp);
                        break;
                }
        }
        fclose(fd);
        /*
         * Disable quotas for any filesystems that have not been found.
         */
        for (qup = quplist; qup; qup = qup->next) {
                if (qup->flags & FOUND) {
                        qup->flags &= ~FOUND;
                        continue;
                }
                qup->dqblk.dqb_bsoftlimit = 0;
                qup->dqblk.dqb_bhardlimit = 0;
                qup->dqblk.dqb_isoftlimit = 0;
                qup->dqblk.dqb_ihardlimit = 0;
        }
        return (1);
}

/*
 * Convert a quotause list to an ASCII file of grace times.
 */
int
writetimes(struct quotause *quplist, int outfd, int quotatype)
{
        struct quotause *qup;
        FILE *fd;

        ftruncate(outfd, 0);
        lseek(outfd, 0, L_SET);
        if ((fd = fdopen(dup(outfd), "w")) == NULL)
                err(1, "%s", tmpfil);
        fprintf(fd, "Time units may be: days, hours, minutes, or seconds\n");
        fprintf(fd, "Grace period before enforcing soft limits for %ss:\n",
            qfextension[quotatype]);
        for (qup = quplist; qup; qup = qup->next) {
                fprintf(fd, "%s: block grace period: %s, ",
                    qup->fsname, cvtstoa(qup->dqblk.dqb_btime));
                fprintf(fd, "file grace period: %s\n",
                    cvtstoa(qup->dqblk.dqb_itime));
        }
        fclose(fd);
        return (1);
}

/*
 * Merge changes of grace times in an ASCII file into a quotause list.
 */
int
readtimes(struct quotause *quplist, char *inname)
{
        struct quotause *qup;
        FILE *fd;
        int cnt;
        char *cp;
        time_t itime, btime, iseconds, bseconds;
        long l_itime, l_btime;
        char *fsp, bunits[10], iunits[10], line1[BUFSIZ];

        fd = fopen(inname, "r");
        if (fd == NULL) {
                warnx("can't re-read temp file!!");
                return (0);
        }
        /*
         * Discard two title lines, then read lines to process.
         */
        fgets(line1, sizeof(line1), fd);
        fgets(line1, sizeof(line1), fd);
        while (fgets(line1, sizeof(line1), fd) != NULL) {
                if ((fsp = strtok(line1, " \t:")) == NULL) {
                        warnx("%s: bad format", line1);
                        return (0);
                }
                if ((cp = strtok(NULL, "\n")) == NULL) {
                        warnx("%s: %s: bad format", fsp, &fsp[strlen(fsp) + 1]);
                        return (0);
                }
                cnt = sscanf(cp,
                    " block grace period: %ld %s file grace period: %ld %s",
                    &l_btime, bunits, &l_itime, iunits);
                if (cnt != 4) {
                        warnx("%s:%s: bad format", fsp, cp);
                        return (0);
                }
                btime = l_btime;
                itime = l_itime;
                if (cvtatos(btime, bunits, &bseconds) == 0)
                        return (0);
                if (cvtatos(itime, iunits, &iseconds) == 0)
                        return (0);
                for (qup = quplist; qup; qup = qup->next) {
                        if (strcmp(fsp, qup->fsname))
                                continue;
                        qup->dqblk.dqb_btime = bseconds;
                        qup->dqblk.dqb_itime = iseconds;
                        qup->flags |= FOUND;
                        break;
                }
        }
        fclose(fd);
        /*
         * reset default grace periods for any filesystems
         * that have not been found.
         */
        for (qup = quplist; qup; qup = qup->next) {
                if (qup->flags & FOUND) {
                        qup->flags &= ~FOUND;
                        continue;
                }
                qup->dqblk.dqb_btime = 0;
                qup->dqblk.dqb_itime = 0;
        }
        return (1);
}

/*
 * Convert seconds to ASCII times.
 */
char *
cvtstoa(time_t secs)
{
        static char buf[20];

        if (secs % (24 * 60 * 60) == 0) {
                secs /= 24 * 60 * 60;
                sprintf(buf, "%ju day%s", (uintmax_t)secs,
                    secs == 1 ? "" : "s");
        } else if (secs % (60 * 60) == 0) {
                secs /= 60 * 60;
                sprintf(buf, "%ju hour%s", (uintmax_t)secs,
                    secs == 1 ? "" : "s");
        } else if (secs % 60 == 0) {
                secs /= 60;
                sprintf(buf, "%ju minute%s", (uintmax_t)secs,
                    secs == 1 ? "" : "s");
        } else
                sprintf(buf, "%ju second%s", (uintmax_t)secs,
                    secs == 1 ? "" : "s");
        return (buf);
}

/*
 * Convert ASCII input times to seconds.
 */
int
cvtatos(time_t period, char *units, time_t *seconds)
{

        if (bcmp(units, "second", 6) == 0)
                *seconds = period;
        else if (bcmp(units, "minute", 6) == 0)
                *seconds = period * 60;
        else if (bcmp(units, "hour", 4) == 0)
                *seconds = period * 60 * 60;
        else if (bcmp(units, "day", 3) == 0)
                *seconds = period * 24 * 60 * 60;
        else {
                printf("%s: bad units, specify %s\n", units,
                    "days, hours, minutes, or seconds");
                return (0);
        }
        return (1);
}

/*
 * Free a list of quotause structures.
 */
void
freeprivs(struct quotause *quplist)
{
        struct quotause *qup, *nextqup;

        for (qup = quplist; qup; qup = nextqup) {
                nextqup = qup->next;
                free(qup);
        }
}

/*
 * Check whether a string is completely composed of digits.
 */
int
alldigits(const char *s)
{
        int c;

        c = *s++;
        do {
                if (!isdigit(c))
                        return (0);
        } while ((c = *s++));
        return (1);
}

/*
 * Check to see if a particular quota is to be enabled.
 */
int
hasquota(struct fstab *fs, int type, char **qfnamep)
{
        char *opt;
        char *cp;
        static char initname, usrname[100], grpname[100];
        static char buf[BUFSIZ];

        if (!initname) {
                sprintf(usrname, "%s%s", qfextension[USRQUOTA], qfname);
                sprintf(grpname, "%s%s", qfextension[GRPQUOTA], qfname);
                initname = 1;
        }
        strcpy(buf, fs->fs_mntops);
        for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
                if ((cp = strchr(opt, '=')))
                        *cp++ = '\0';
                if (type == USRQUOTA && strcmp(opt, usrname) == 0)
                        break;
                if (type == GRPQUOTA && strcmp(opt, grpname) == 0)
                        break;
        }
        if (!opt)
                return (0);
        if (cp) {
                *qfnamep = cp;
                return (1);
        }
        sprintf(buf, "%s/%s.%s", fs->fs_file, qfname, qfextension[type]);
        *qfnamep = buf;
        return (1);
}