/*      $NetBSD: function.c,v 1.81 2024/02/05 21:46:07 andvar Exp $     */

/*-
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Cimarron D. Taylor of the University of California, Berkeley.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "from: @(#)function.c    8.10 (Berkeley) 5/4/95";
#else
__RCSID("$NetBSD: function.c,v 1.81 2024/02/05 21:46:07 andvar Exp $");
#endif
#endif /* not lint */

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

#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fnmatch.h>
#include <fts.h>
#include <grp.h>
#include <inttypes.h>
#include <limits.h>
#include <pwd.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <tzfile.h>
#include <unistd.h>
#include <util.h>

#include "find.h"

#define COMPARE(a, b) {                                                 \
        switch (plan->flags) {                                          \
        case F_EQUAL:                                                   \
                return (a == b);                                        \
        case F_LESSTHAN:                                                \
                return (a < b);                                         \
        case F_GREATER:                                                 \
                return (a > b);                                         \
        default:                                                        \
                abort();                                                \
        }                                                               \
}

static  int64_t find_parsenum(PLAN *, const char *, const char *, char *);
static  void    run_f_exec(PLAN *);
        int     f_always_true(PLAN *, FTSENT *);
        int     f_amin(PLAN *, FTSENT *);
        int     f_anewer(PLAN *, FTSENT *);
        int     f_asince(PLAN *, FTSENT *);
        int     f_atime(PLAN *, FTSENT *);
        int     f_cmin(PLAN *, FTSENT *);
        int     f_cnewer(PLAN *, FTSENT *);
        int     f_csince(PLAN *, FTSENT *);
        int     f_ctime(PLAN *, FTSENT *);
        int     f_delete(PLAN *, FTSENT *);
        int     f_empty(PLAN *, FTSENT *);
        int     f_exec(PLAN *, FTSENT *);
        int     f_execdir(PLAN *, FTSENT *);
        int     f_false(PLAN *, FTSENT *);
        int     f_flags(PLAN *, FTSENT *);
        int     f_fprint(PLAN *, FTSENT *);
        int     f_fstype(PLAN *, FTSENT *);
        int     f_group(PLAN *, FTSENT *);
        int     f_iname(PLAN *, FTSENT *);
        int     f_inum(PLAN *, FTSENT *);
        int     f_links(PLAN *, FTSENT *);
        int     f_ls(PLAN *, FTSENT *);
        int     f_mindepth(PLAN *, FTSENT *);
        int     f_maxdepth(PLAN *, FTSENT *);
        int     f_mmin(PLAN *, FTSENT *);
        int     f_mtime(PLAN *, FTSENT *);
        int     f_name(PLAN *, FTSENT *);
        int     f_newer(PLAN *, FTSENT *);
/*
 * Unimplemented Gnu findutils options
 *
        int     f_newerBB(PLAN *, FTSENT *);
        int     f_newerBa(PLAN *, FTSENT *);
        int     f_newerBc(PLAN *, FTSENT *);
        int     f_newerBm(PLAN *, FTSENT *);
        int     f_newerBt(PLAN *, FTSENT *);
        int     f_neweraB(PLAN *, FTSENT *);
        int     f_newerac(PLAN *, FTSENT *);
        int     f_neweram(PLAN *, FTSENT *);
        int     f_newerca(PLAN *, FTSENT *);
        int     f_newercm(PLAN *, FTSENT *);
        int     f_newercB(PLAN *, FTSENT *);
        int     f_newermB(PLAN *, FTSENT *);
        int     f_newerma(PLAN *, FTSENT *);
        int     f_newermc(PLAN *, FTSENT *);
 *
 */
        int     f_nogroup(PLAN *, FTSENT *);
        int     f_nouser(PLAN *, FTSENT *);
        int     f_path(PLAN *, FTSENT *);
        int     f_perm(PLAN *, FTSENT *);
        int     f_print(PLAN *, FTSENT *);
        int     f_print0(PLAN *, FTSENT *);
        int     f_printx(PLAN *, FTSENT *);
        int     f_prune(PLAN *, FTSENT *);
        int     f_regex(PLAN *, FTSENT *);
        int     f_since(PLAN *, FTSENT *);
        int     f_size(PLAN *, FTSENT *);
        int     f_type(PLAN *, FTSENT *);
        int     f_user(PLAN *, FTSENT *);
        int     f_not(PLAN *, FTSENT *);
        int     f_or(PLAN *, FTSENT *);
static  PLAN   *c_regex_common(char ***, int, enum ntype, bool);
static  PLAN   *palloc(enum ntype, int (*)(PLAN *, FTSENT *));

extern int dotfd;
extern FTS *tree;
extern time_t now;

/*
 * find_parsenum --
 *      Parse a string of the form [+-]# and return the value.
 */
static int64_t
find_parsenum(PLAN *plan, const char *option, const char *vp, char *endch)
{
        int64_t value;
        const char *str;
        char *endchar; /* Pointer to character ending conversion. */

        /* Determine comparison from leading + or -. */
        str = vp;
        switch (*str) {
        case '+':
                ++str;
                plan->flags = F_GREATER;
                break;
        case '-':
                ++str;
                plan->flags = F_LESSTHAN;
                break;
        default:
                plan->flags = F_EQUAL;
                break;
        }

        /*
         * Convert the string with strtol().  Note, if strtol() returns zero
         * and endchar points to the beginning of the string we know we have
         * a syntax error.
         */
        value = strtoll(str, &endchar, 10);
        if (value == 0 && endchar == str)
                errx(1, "%s: %s: illegal numeric value", option, vp);
        if (endchar[0] && (endch == NULL || endchar[0] != *endch))
                errx(1, "%s: %s: illegal trailing character", option, vp);
        if (endch)
                *endch = endchar[0];
        return (value);
}

/*
 * find_parsedate --
 *
 * Validate the timestamp argument or report an error
 */
static time_t
find_parsedate(PLAN *plan, const char *option, const char *vp)
{
        time_t timestamp;

        errno = 0;
        timestamp = parsedate(vp, NULL, NULL);
        if (timestamp == -1 && errno != 0)
                errx(1, "%s: %s: invalid timestamp value", option, vp);
        return timestamp;
}

/*
 * The value of n for the inode times (atime, ctime, and mtime) is a range,
 * i.e. n matches from (n - 1) to n 24 hour periods.  This interacts with
 * -n, such that "-mtime -1" would be less than 0 days, which isn't what the
 * user wanted.  Correct so that -1 is "less than 1".
 */
#define TIME_CORRECT(p, ttype)                                          \
        if ((p)->type == ttype && (p)->flags == F_LESSTHAN)             \
                ++((p)->t_data);

/*
 * -amin n functions --
 *
 *      True if the difference between the file access time and the
 *      current time is n 1 minute periods.
 */
int
f_amin(PLAN *plan, FTSENT *entry)
{
        COMPARE((now - entry->fts_statp->st_atime +
            SECSPERMIN - 1) / SECSPERMIN, plan->t_data);
}

PLAN *
c_amin(char ***argvp, int isok, char *opt)
{
        char *arg = **argvp;
        PLAN *new;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_AMIN, f_amin);
        new->t_data = find_parsenum(new, opt, arg, NULL);
        TIME_CORRECT(new, N_AMIN);
        return (new);
}

/*
 * -anewer file functions --
 *
 *      True if the current file has been accessed more recently
 *      than the access time of the file named by the pathname
 *      file.
 */
int
f_anewer(PLAN *plan, FTSENT *entry)
{

        return timespeccmp(&entry->fts_statp->st_atim, &plan->ts_data, >);
}

PLAN *
c_anewer(char ***argvp, int isok, char *opt)
{
        char *filename = **argvp;
        PLAN *new;
        struct stat sb;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        if (stat(filename, &sb))
                err(1, "%s: %s", opt, filename);
        new = palloc(N_ANEWER, f_anewer);
        new->ts_data = sb.st_atim;
        return (new);
}

/*
 * -asince "timestamp" functions --
 *
 *      True if the file access time is greater than the timestamp value
 */
int
f_asince(PLAN *plan, FTSENT *entry)
{
        COMPARE(entry->fts_statp->st_atime, plan->t_data);
}

PLAN *
c_asince(char ***argvp, int isok, char *opt)
{
        char *arg = **argvp;
        PLAN *new;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_ASINCE, f_asince);
        new->t_data = find_parsedate(new, opt, arg);
        new->flags = F_GREATER;
        return (new);
}

/*
 * -atime n functions --
 *
 *      True if the difference between the file access time and the
 *      current time is n 24 hour periods.
 */
int
f_atime(PLAN *plan, FTSENT *entry)
{
        COMPARE((now - entry->fts_statp->st_atime +
            SECSPERDAY - 1) / SECSPERDAY, plan->t_data);
}

PLAN *
c_atime(char ***argvp, int isok, char *opt)
{
        char *arg = **argvp;
        PLAN *new;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_ATIME, f_atime);
        new->t_data = find_parsenum(new, opt, arg, NULL);
        TIME_CORRECT(new, N_ATIME);
        return (new);
}

/*
 * -cmin n functions --
 *
 *      True if the difference between the last change of file
 *      status information and the current time is n 24 hour periods.
 */
int
f_cmin(PLAN *plan, FTSENT *entry)
{
        COMPARE((now - entry->fts_statp->st_ctime +
            SECSPERMIN - 1) / SECSPERMIN, plan->t_data);
}

PLAN *
c_cmin(char ***argvp, int isok, char *opt)
{
        char *arg = **argvp;
        PLAN *new;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_CMIN, f_cmin);
        new->t_data = find_parsenum(new, opt, arg, NULL);
        TIME_CORRECT(new, N_CMIN);
        return (new);
}

/*
 * -cnewer file functions --
 *
 *      True if the current file has been changed more recently
 *      than the changed time of the file named by the pathname
 *      file.
 */
int
f_cnewer(PLAN *plan, FTSENT *entry)
{

        return timespeccmp(&entry->fts_statp->st_ctim, &plan->ts_data, >);
}

PLAN *
c_cnewer(char ***argvp, int isok, char *opt)
{
        char *filename = **argvp;
        PLAN *new;
        struct stat sb;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        if (stat(filename, &sb))
                err(1, "%s: %s ", opt, filename);
        new = palloc(N_CNEWER, f_cnewer);
        new->ts_data = sb.st_ctim;
        return (new);
}

/*
 * -csince "timestamp" functions --
 *
 *      True if the file status change time is greater than the timestamp value
 */
int
f_csince(PLAN *plan, FTSENT *entry)
{
        COMPARE(entry->fts_statp->st_ctime, plan->t_data);
}

PLAN *
c_csince(char ***argvp, int isok, char *opt)
{
        char *arg = **argvp;
        PLAN *new;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_CSINCE, f_csince);
        new->t_data = find_parsedate(new, opt, arg);
        new->flags = F_GREATER;
        return (new);
}

/*
 * -ctime n functions --
 *
 *      True if the difference between the last change of file
 *      status information and the current time is n 24 hour periods.
 */
int
f_ctime(PLAN *plan, FTSENT *entry)
{
        COMPARE((now - entry->fts_statp->st_ctime +
            SECSPERDAY - 1) / SECSPERDAY, plan->t_data);
}

PLAN *
c_ctime(char ***argvp, int isok, char *opt)
{
        char *arg = **argvp;
        PLAN *new;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_CTIME, f_ctime);
        new->t_data = find_parsenum(new, opt, arg, NULL);
        TIME_CORRECT(new, N_CTIME);
        return (new);
}

/*
 * -delete functions --
 *
 *      Always true.  Makes its best shot and continues on regardless.
 */
int
f_delete(PLAN *plan __unused, FTSENT *entry)
{
        /* ignore these from fts */
        if (strcmp(entry->fts_accpath, ".") == 0 ||
            strcmp(entry->fts_accpath, "..") == 0)
                return 1;

        /* sanity check */
        if (isdepth == 0 ||                     /* depth off */
            (ftsoptions & FTS_NOSTAT) ||        /* not stat()ing */
            !(ftsoptions & FTS_PHYSICAL) ||     /* physical off */
            (ftsoptions & FTS_LOGICAL))         /* or finally, logical on */
                errx(1, "-delete: insecure options got turned on");

        /* Potentially unsafe - do not accept relative paths whatsoever */
        if (entry->fts_level > 0 && strchr(entry->fts_accpath, '/') != NULL)
                errx(1, "-delete: %s: relative path potentially not safe",
                        entry->fts_accpath);

        /* Turn off user immutable bits if running as root */
        if ((entry->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
            !(entry->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
            geteuid() == 0)
                chflags(entry->fts_accpath,
                       entry->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));

        /* rmdir directories, unlink everything else */
        if (S_ISDIR(entry->fts_statp->st_mode)) {
                if (rmdir(entry->fts_accpath) < 0 && errno != ENOTEMPTY)
                        warn("-delete: rmdir(%s)", entry->fts_path);
        } else {
                if (unlink(entry->fts_accpath) < 0)
                        warn("-delete: unlink(%s)", entry->fts_path);
        }

        /* "succeed" */
        return 1;
}

PLAN *
c_delete(char ***argvp __unused, int isok, char *opt)
{

        ftsoptions &= ~FTS_NOSTAT;      /* no optimize */
        ftsoptions |= FTS_PHYSICAL;     /* disable -follow */
        ftsoptions &= ~FTS_LOGICAL;     /* disable -follow */
        isoutput = 1;                   /* possible output */
        isdepth = 1;                    /* -depth implied */

        return palloc(N_DELETE, f_delete);
}

/*
 * -depth functions --
 *
 *      Always true, causes descent of the directory hierarchy to be done
 *      so that all entries in a directory are acted on before the directory
 *      itself.
 */
int
f_always_true(PLAN *plan, FTSENT *entry)
{

        return (1);
}

PLAN *
c_depth(char ***argvp, int isok, char *opt)
{
        isdepth = 1;

        return (palloc(N_DEPTH, f_always_true));
}

/*
 * -empty functions --
 *
 *      True if the file or directory is empty
 */
int
f_empty(PLAN *plan, FTSENT *entry)
{
        if (S_ISREG(entry->fts_statp->st_mode) &&
            entry->fts_statp->st_size == 0)
                return (1);
        if (S_ISDIR(entry->fts_statp->st_mode)) {
                struct dirent *dp;
                int empty;
                DIR *dir;

                empty = 1;
                dir = opendir(entry->fts_accpath);
                if (dir == NULL)
                        return (0);
                for (dp = readdir(dir); dp; dp = readdir(dir))
                        if (dp->d_name[0] != '.' ||
                            (dp->d_name[1] != '\0' &&
                                (dp->d_name[1] != '.' || dp->d_name[2] != '\0'))) {
                                empty = 0;
                                break;
                        }
                closedir(dir);
                return (empty);
        }
        return (0);
}

PLAN *
c_empty(char ***argvp, int isok, char *opt)
{
        ftsoptions &= ~FTS_NOSTAT;

        return (palloc(N_EMPTY, f_empty));
}

/*
 * [-exec | -ok] utility [arg ... ] ; functions --
 * [-exec | -ok] utility [arg ... ] {} + functions --
 *
 *      If the end of the primary expression is delimited by a
 *      semicolon: true if the executed utility returns a zero value
 *      as exit status.  If "{}" occurs anywhere, it gets replaced by
 *      the current pathname.
 *
 *      If the end of the primary expression is delimited by a plus
 *      sign: always true. Pathnames for which the primary is
 *      evaluated shall be aggregated into sets. The utility will be
 *      executed once per set, with "{}" replaced by the entire set of
 *      pathnames (as if xargs). "{}" must appear last.
 *
 *      The current directory for the execution of utility is the same
 *      as the current directory when the find utility was started.
 *
 *      The primary -ok is different in that it requests affirmation
 *      of the user before executing the utility.
 */
int
f_exec(PLAN *plan, FTSENT *entry)
{
        size_t cnt;
        int l;
        pid_t pid;
        int status;

        if (plan->flags & F_PLUSSET) {
                /*
                 * Confirm sufficient buffer space, then copy the path
                 * to the buffer.
                 */
                l = strlen(entry->fts_path);
                if (plan->ep_p + l < plan->ep_ebp) {
                        plan->ep_bxp[plan->ep_narg++] =
                            strcpy(plan->ep_p, entry->fts_path);
                        plan->ep_p += l + 1;

                        if (plan->ep_narg == plan->ep_maxargs)
                                run_f_exec(plan);
                } else {
                        /*
                         * Without sufficient space to copy in the next
                         * argument, run the command to empty out the
                         * buffer before re-attepting the copy.
                         */
                        run_f_exec(plan);
                        if ((plan->ep_p + l < plan->ep_ebp)) {
                                plan->ep_bxp[plan->ep_narg++]
                                    = strcpy(plan->ep_p, entry->fts_path);
                                plan->ep_p += l + 1;
                        } else
                                errx(1, "insufficient space for argument");
                }
                return (1);
        } else {
                for (cnt = 0; plan->e_argv[cnt]; ++cnt)
                        if (plan->e_len[cnt])
                                brace_subst(plan->e_orig[cnt],
                                    &plan->e_argv[cnt],
                                    entry->fts_path,
                                    &plan->e_len[cnt]);
                if (plan->flags & F_NEEDOK && !queryuser(plan->e_argv))
                        return (0);

                /* Don't mix output of command with find output. */
                fflush(stdout);
                fflush(stderr);

                switch (pid = vfork()) {
                case -1:
                        err(1, "vfork");
                        /* NOTREACHED */
                case 0:
                        /* change dir back from where we started */
                        if (!(ftsoptions & FTS_NOCHDIR) && fchdir(dotfd)) {
                                warn("chdir");
                                _exit(1);
                        }
                        execvp(plan->e_argv[0], plan->e_argv);
                        warn("%s", plan->e_argv[0]);
                        _exit(1);
                }
                pid = waitpid(pid, &status, 0);
                return (pid != -1 && WIFEXITED(status)
                    && !WEXITSTATUS(status));
        }
}

static void
run_f_exec(PLAN *plan)
{
        pid_t pid;
        int rval, status;

        /* Ensure arg list is null terminated. */
        plan->ep_bxp[plan->ep_narg] = NULL;

        /* Don't mix output of command with find output. */
        fflush(stdout);
        fflush(stderr);

        switch (pid = vfork()) {
        case -1:
                err(1, "vfork");
                /* NOTREACHED */
        case 0:
                /* change dir back from where we started */
                if (!(ftsoptions & FTS_NOCHDIR) && fchdir(dotfd)) {
                        warn("chdir");
                        _exit(1);
                }
                execvp(plan->e_argv[0], plan->e_argv);
                warn("%s", plan->e_argv[0]);
                _exit(1);
        }

        /* Clear out the argument list. */
        plan->ep_narg = 0;
        plan->ep_bxp[plan->ep_narg] = NULL;
        /* As well as the argument buffer. */
        plan->ep_p = plan->ep_bbp;
        *plan->ep_p = '\0';

        pid = waitpid(pid, &status, 0);
        if (WIFEXITED(status))
                rval = WEXITSTATUS(status);
        else
                rval = -1;

        /*
         * If we have a non-zero exit status, preserve it so find(1) can
         * later exit with it.
         */
        if (rval)
                plan->ep_rval = rval;
}

/*
 * c_exec --
 *      build three parallel arrays, one with pointers to the strings passed
 *      on the command line, one with (possibly duplicated) pointers to the
 *      argv array, and one with integer values that are lengths of the
 *      strings, but also flags meaning that the string has to be massaged.
 *
 *      If -exec ... {} +, use only the first array, but make it large
 *      enough to hold 5000 args (cf. src/usr.bin/xargs/xargs.c for a
 *      discussion), and then allocate ARG_MAX - 4K of space for args.
 */
PLAN *
c_exec(char ***argvp, int isok, char *opt)
{
        PLAN *new;                      /* node returned */
        size_t cnt;
        int brace, lastbrace;
        char **argv, **ap, *p;

        isoutput = 1;

        new = palloc(N_EXEC, f_exec);
        if (isok)
                new->flags |= F_NEEDOK;

        /*
         * Terminate if we encounter an arg exactly equal to ";", or an
         * arg exactly equal to "+" following an arg exactly equal to
         * "{}".
         */
        for (ap = argv = *argvp, brace = 0;; ++ap) {
                if (!*ap)
                        errx(1, "%s: no terminating \";\" or \"+\"", opt);
                lastbrace = brace;
                brace = 0;
                if (strcmp(*ap, "{}") == 0)
                        brace = 1;
                if (strcmp(*ap, ";") == 0)
                        break;
                if (strcmp(*ap, "+") == 0 && lastbrace) {
                        new->flags |= F_PLUSSET;
                        break;
                }
        }

        /*
         * POSIX says -ok ... {} + "need not be supported," and it does
         * not make much sense anyway.
         */
        if (new->flags & F_NEEDOK && new->flags & F_PLUSSET)
                errx(1, "%s: terminating \"+\" not permitted.", opt);

        if (new->flags & F_PLUSSET) {
                size_t c, bufsize;

                cnt = ap - *argvp - 1;                  /* units are words */
                new->ep_maxargs = ARG_MAX / (sizeof (char *) + 16);
                if (new->ep_maxargs > 5000)
                        new->ep_maxargs = 5000;
                new->e_argv = emalloc((cnt + new->ep_maxargs)
                    * sizeof(*new->e_argv));

                /* We start stuffing arguments after the user's last one. */
                new->ep_bxp = &new->e_argv[cnt];
                new->ep_narg = 0;

                /*
                 * Count up the space of the user's arguments, and
                 * subtract that from what we allocate.
                 */
#define MAXARG (ARG_MAX - 4 * 1024)
                for (argv = *argvp, c = 0, cnt = 0;
                     argv < ap;
                     ++argv, ++cnt) {
                        c += strlen(*argv) + 1;
                        if (c >= MAXARG)
                                errx(1, "Arguments too long");
                        new->e_argv[cnt] = *argv;
                }
                if (c + new->ep_maxargs * sizeof (char *) >= MAXARG)
                        errx(1, "Arguments too long");
                bufsize = MAXARG - c - new->ep_maxargs * sizeof (char *);

                /*
                 * Allocate, and then initialize current, base, and
                 * end pointers.
                 */
                new->ep_p = new->ep_bbp = emalloc(bufsize + 1);
                new->ep_ebp = new->ep_bbp + bufsize - 1;
                new->ep_rval = 0;
        } else { /* !F_PLUSSET */
                cnt = ap - *argvp + 1;
                new->e_argv = emalloc(cnt * sizeof(*new->e_argv));
                new->e_orig = emalloc(cnt * sizeof(*new->e_orig));
                new->e_len = emalloc(cnt * sizeof(*new->e_len));

                for (argv = *argvp, cnt = 0; argv < ap; ++argv, ++cnt) {
                        new->e_orig[cnt] = *argv;
                        for (p = *argv; *p; ++p)
                                if (p[0] == '{' && p[1] == '}') {
                                        new->e_argv[cnt] =
                                                emalloc(MAXPATHLEN);
                                        new->e_len[cnt] = MAXPATHLEN;
                                        break;
                                }
                        if (!*p) {
                                new->e_argv[cnt] = *argv;
                                new->e_len[cnt] = 0;
                        }
                }
                new->e_orig[cnt] = NULL;
        }

        new->e_argv[cnt] = NULL;
        *argvp = argv + 1;
        return (new);
}

/*
 * -execdir utility [arg ... ] ; functions --
 *
 *      True if the executed utility returns a zero value as exit status.
 *      The end of the primary expression is delimited by a semicolon.  If
 *      "{}" occurs anywhere, it gets replaced by the unqualified pathname.
 *      The current directory for the execution of utility is the same as
 *      the directory where the file lives.
 */
int
f_execdir(PLAN *plan, FTSENT *entry)
{
        size_t cnt;
        pid_t pid;
        int status;
        char *file;

        /* XXX - if file/dir ends in '/' this will not work -- can it? */
        if ((file = strrchr(entry->fts_path, '/')))
                file++;
        else
                file = entry->fts_path;

        for (cnt = 0; plan->e_argv[cnt]; ++cnt)
                if (plan->e_len[cnt])
                        brace_subst(plan->e_orig[cnt], &plan->e_argv[cnt],
                            file, &plan->e_len[cnt]);

        /* don't mix output of command with find output */
        fflush(stdout);
        fflush(stderr);

        switch (pid = vfork()) {
        case -1:
                err(1, "fork");
                /* NOTREACHED */
        case 0:
                execvp(plan->e_argv[0], plan->e_argv);
                warn("%s", plan->e_argv[0]);
                _exit(1);
        }
        pid = waitpid(pid, &status, 0);
        return (pid != -1 && WIFEXITED(status) && !WEXITSTATUS(status));
}

/*
 * c_execdir --
 *      build three parallel arrays, one with pointers to the strings passed
 *      on the command line, one with (possibly duplicated) pointers to the
 *      argv array, and one with integer values that are lengths of the
 *      strings, but also flags meaning that the string has to be massaged.
 */
PLAN *
c_execdir(char ***argvp, int isok, char *opt)
{
        PLAN *new;                      /* node returned */
        size_t cnt;
        char **argv, **ap, *p;

        ftsoptions &= ~FTS_NOSTAT;
        isoutput = 1;

        new = palloc(N_EXECDIR, f_execdir);

        for (ap = argv = *argvp;; ++ap) {
                if (!*ap)
                        errx(1, "%s: no terminating \";\"", opt);
                if (**ap == ';')
                        break;
        }

        cnt = ap - *argvp + 1;
        new->e_argv = emalloc(cnt * sizeof(*new->e_argv));
        new->e_orig = emalloc(cnt * sizeof(*new->e_orig));
        new->e_len = emalloc(cnt * sizeof(*new->e_len));

        for (argv = *argvp, cnt = 0; argv < ap; ++argv, ++cnt) {
                new->e_orig[cnt] = *argv;
                for (p = *argv; *p; ++p)
                        if (p[0] == '{' && p[1] == '}') {
                                new->e_argv[cnt] = emalloc(MAXPATHLEN);
                                new->e_len[cnt] = MAXPATHLEN;
                                break;
                        }
                if (!*p) {
                        new->e_argv[cnt] = *argv;
                        new->e_len[cnt] = 0;
                }
        }
        new->e_argv[cnt] = new->e_orig[cnt] = NULL;

        *argvp = argv + 1;
        return (new);
}

PLAN *
c_exit(char ***argvp, int isok, char *opt)
{
        char *arg = **argvp;
        PLAN *new;

        /* not technically true, but otherwise '-print' is implied */
        isoutput = 1;

        new = palloc(N_EXIT, f_always_true);

        if (arg) {
                (*argvp)++;
                new->exit_val = find_parsenum(new, opt, arg, NULL);
        } else
                new->exit_val = 0;

        return (new);
}


/*
 * -false function
 */
int
f_false(PLAN *plan, FTSENT *entry)
{

        return (0);
}

PLAN *
c_false(char ***argvp, int isok, char *opt)
{
        return (palloc(N_FALSE, f_false));
}


/*
 * -flags [-]flags functions --
 */
int
f_flags(PLAN *plan, FTSENT *entry)
{
        uint32_t flags;

        flags = entry->fts_statp->st_flags;
        if (plan->flags == F_ATLEAST)
                return ((plan->f_data | flags) == flags);
        else
                return (flags == plan->f_data);
        /* NOTREACHED */
}

PLAN *
c_flags(char ***argvp, int isok, char *opt)
{
        char *flags = **argvp;
        PLAN *new;
        u_long flagset;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_FLAGS, f_flags);

        if (*flags == '-') {
                new->flags = F_ATLEAST;
                ++flags;
        }

        flagset = 0;
        if ((strcmp(flags, "none") != 0) &&
            (string_to_flags(&flags, &flagset, NULL) != 0))
                errx(1, "%s: %s: illegal flags string", opt, flags);
        new->f_data = flagset;
        return (new);
}

/*
 * -follow functions --
 *
 *      Always true, causes symbolic links to be followed on a global
 *      basis.
 */
PLAN *
c_follow(char ***argvp, int isok, char *opt)
{
        ftsoptions &= ~FTS_PHYSICAL;
        ftsoptions |= FTS_LOGICAL;

        return (palloc(N_FOLLOW, f_always_true));
}

/* -fprint functions --
 *
 *      Causes the current pathname to be written to the defined output file.
 */
int
f_fprint(PLAN *plan, FTSENT *entry)
{

        if (-1 == fprintf(plan->fprint_file, "%s\n", entry->fts_path))
                warn("fprintf");

        return(1);

        /* no descriptors are closed; they will be closed by
           operating system when this find command exits.  */
}

PLAN *
c_fprint(char ***argvp, int isok, char *opt)
{
        PLAN *new;

        isoutput = 1; /* do not assume -print */

        new = palloc(N_FPRINT, f_fprint);

        if (NULL == (new->fprint_file = fopen(**argvp, "w")))
                err(1, "%s: %s: cannot create file", opt, **argvp);

        (*argvp)++;
        return (new);
}

/*
 * -fstype functions --
 *
 *      True if the file is of a certain type.
 */
int
f_fstype(PLAN *plan, FTSENT *entry)
{
        static dev_t curdev;    /* need a guaranteed illegal dev value */
        static int first = 1;
        struct statvfs sb;
        static short val;
        static char fstype[sizeof(sb.f_fstypename)];
        char *p, save[2];

        memset(&save, 0, sizeof save);  /* XXX gcc */

        /* Only check when we cross mount point. */
        if (first || curdev != entry->fts_statp->st_dev) {
                curdev = entry->fts_statp->st_dev;

                /*
                 * Statfs follows symlinks; find wants the link's file system,
                 * not where it points.
                 */
                if (entry->fts_info == FTS_SL ||
                    entry->fts_info == FTS_SLNONE) {
                        if ((p = strrchr(entry->fts_accpath, '/')) != NULL)
                                ++p;
                        else
                                p = entry->fts_accpath;
                        save[0] = p[0];
                        p[0] = '.';
                        save[1] = p[1];
                        p[1] = '\0';

                } else
                        p = NULL;

                if (statvfs(entry->fts_accpath, &sb))
                        err(1, "%s", entry->fts_accpath);

                if (p) {
                        p[0] = save[0];
                        p[1] = save[1];
                }

                first = 0;

                /*
                 * Further tests may need both of these values, so
                 * always copy both of them.
                 */
                val = sb.f_flag;
                strlcpy(fstype, sb.f_fstypename, sizeof(fstype));
        }
        switch (plan->flags) {
        case F_MTFLAG:
                return (val & plan->mt_data);
        case F_MTTYPE:
                return (strncmp(fstype, plan->c_data, sizeof(fstype)) == 0);
        default:
                abort();
        }
}

PLAN *
c_fstype(char ***argvp, int isok, char *opt)
{
        char *arg = **argvp;
        PLAN *new;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_FSTYPE, f_fstype);

        switch (*arg) {
        case 'l':
                if (!strcmp(arg, "local")) {
                        new->flags = F_MTFLAG;
                        new->mt_data = MNT_LOCAL;
                        return (new);
                }
                break;
        case 'r':
                if (!strcmp(arg, "rdonly")) {
                        new->flags = F_MTFLAG;
                        new->mt_data = MNT_RDONLY;
                        return (new);
                }
                break;
        }

        new->flags = F_MTTYPE;
        new->c_data = arg;
        return (new);
}

/*
 * -group gname functions --
 *
 *      True if the file belongs to the group gname.  If gname is numeric and
 *      an equivalent of the getgrnam() function does not return a valid group
 *      name, gname is taken as a group ID.
 */
int
f_group(PLAN *plan, FTSENT *entry)
{

        COMPARE(entry->fts_statp->st_gid, plan->g_data);
}

PLAN *
c_group(char ***argvp, int isok, char *opt)
{
        char *gname = **argvp;
        PLAN *new;
        struct group *g;
        gid_t gid;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_GROUP, f_group);
        g = getgrnam(gname);
        if (g == NULL) {
                if (atoi(gname) == 0 && gname[0] != '0' &&
                    strcmp(gname, "+0") && strcmp(gname, "-0"))
                        errx(1, "%s: %s: no such group", opt, gname);
                gid = find_parsenum(new, "-group", gname, NULL);

        } else {
                new->flags = F_EQUAL;
                gid = g->gr_gid;
        }

        new->g_data = gid;
        return (new);
}

/*
 * -inum n functions --
 *
 *      True if the file has inode # n.
 */
int
f_inum(PLAN *plan, FTSENT *entry)
{

        COMPARE(entry->fts_statp->st_ino, plan->i_data);
}

PLAN *
c_inum(char ***argvp, int isok, char *opt)
{
        char *arg = **argvp;
        PLAN *new;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_INUM, f_inum);
        new->i_data = find_parsenum(new, opt, arg, NULL);
        return (new);
}

/*
 * -links n functions --
 *
 *      True if the file has n links.
 */
int
f_links(PLAN *plan, FTSENT *entry)
{

        COMPARE(entry->fts_statp->st_nlink, plan->l_data);
}

PLAN *
c_links(char ***argvp, int isok, char *opt)
{
        char *arg = **argvp;
        PLAN *new;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_LINKS, f_links);
        new->l_data = (nlink_t)find_parsenum(new, opt, arg, NULL);
        return (new);
}

/*
 * -ls functions --
 *
 *      Always true - prints the current entry to stdout in "ls" format.
 */
int
f_ls(PLAN *plan, FTSENT *entry)
{

        printlong(entry->fts_path, entry->fts_accpath, entry->fts_statp);
        return (1);
}

PLAN *
c_ls(char ***argvp, int isok, char *opt)
{

        ftsoptions &= ~FTS_NOSTAT;
        isoutput = 1;

        return (palloc(N_LS, f_ls));
}

/*
 * - maxdepth n functions --
 *
 *      True if the current search depth is less than or equal to the
 *      maximum depth specified
 */
int
f_maxdepth(PLAN *plan, FTSENT *entry)
{
        extern FTS *tree;

        if (entry->fts_level >= plan->max_data)
                fts_set(tree, entry, FTS_SKIP);
        return (entry->fts_level <= plan->max_data);
}

PLAN *
c_maxdepth(char ***argvp, int isok, char *opt)
{
        char *arg = **argvp;
        PLAN *new;

        (*argvp)++;
        new = palloc(N_MAXDEPTH, f_maxdepth);
        new->max_data = atoi(arg);
        return (new);
}

/*
 * - mindepth n functions --
 *
 *      True if the current search depth is greater than or equal to the
 *      minimum depth specified
 */
int
f_mindepth(PLAN *plan, FTSENT *entry)
{
        return (entry->fts_level >= plan->min_data);
}

PLAN *
c_mindepth(char ***argvp, int isok, char *opt)
{
        char *arg = **argvp;
        PLAN *new;

        (*argvp)++;
        new = palloc(N_MINDEPTH, f_mindepth);
        new->min_data = atoi(arg);
        return (new);
}

/*
 * -mmin n functions --
 *
 *      True if the difference between the file modification time and the
 *      current time is n 24 hour periods.
 */
int
f_mmin(PLAN *plan, FTSENT *entry)
{
        COMPARE((now - entry->fts_statp->st_mtime + SECSPERMIN - 1) /
            SECSPERMIN, plan->t_data);
}

PLAN *
c_mmin(char ***argvp, int isok, char *opt)
{
        char *arg = **argvp;
        PLAN *new;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_MMIN, f_mmin);
        new->t_data = find_parsenum(new, opt, arg, NULL);
        TIME_CORRECT(new, N_MMIN);
        return (new);
}

/*
 * -mtime n functions --
 *
 *      True if the difference between the file modification time and the
 *      current time is n 24 hour periods.
 */
int
f_mtime(PLAN *plan, FTSENT *entry)
{
        COMPARE((now - entry->fts_statp->st_mtime + SECSPERDAY - 1) /
            SECSPERDAY, plan->t_data);
}

PLAN *
c_mtime(char ***argvp, int isok, char *opt)
{
        char *arg = **argvp;
        PLAN *new;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_MTIME, f_mtime);
        new->t_data = find_parsenum(new, opt, arg, NULL);
        TIME_CORRECT(new, N_MTIME);
        return (new);
}

/*
 * -name functions --
 *
 *      True if the basename of the filename being examined
 *      matches pattern using Pattern Matching Notation S3.14
 */
int
f_name(PLAN *plan, FTSENT *entry)
{

        return (!fnmatch(plan->c_data, entry->fts_name, 0));
}

PLAN *
c_name(char ***argvp, int isok, char *opt)
{
        char *pattern = **argvp;
        PLAN *new;

        (*argvp)++;
        new = palloc(N_NAME, f_name);
        new->c_data = pattern;
        return (new);
}

/*
 * -iname functions --
 *
 *      Similar to -name, but does case insensitive matching
 *
 */
int
f_iname(PLAN *plan, FTSENT *entry)
{
        return (!fnmatch(plan->c_data, entry->fts_name, FNM_CASEFOLD));
}

PLAN *
c_iname(char ***argvp, int isok, char *opt)
{
        char *pattern = **argvp;
        PLAN *new;

        (*argvp)++;
        new = palloc(N_INAME, f_iname);
        new->c_data = pattern;
        return (new);
}

/*
 * -newer file functions --
 *
 *      True if the current file has been modified more recently
 *      than the modification time of the file named by the pathname
 *      file.
 */
int
f_newer(PLAN *plan, FTSENT *entry)
{

        return timespeccmp(&entry->fts_statp->st_mtim, &plan->ts_data, >);
}

PLAN *
c_newer(char ***argvp, int isok, char *opt)
{
        char *filename = **argvp;
        PLAN *new;
        struct stat sb;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        if (stat(filename, &sb))
                err(1, "%s: %s", opt, filename);
        new = palloc(N_NEWER, f_newer);
        new->ts_data = sb.st_mtim;
        return (new);
}

/*
 * -nogroup functions --
 *
 *      True if file belongs to a user ID for which the equivalent
 *      of the getgrnam() 9.2.1 [POSIX.1] function returns NULL.
 */
int
f_nogroup(PLAN *plan, FTSENT *entry)
{

        return (group_from_gid(entry->fts_statp->st_gid, 1) ? 0 : 1);
}

PLAN *
c_nogroup(char ***argvp, int isok, char *opt)
{
        ftsoptions &= ~FTS_NOSTAT;

        return (palloc(N_NOGROUP, f_nogroup));
}

/*
 * -nouser functions --
 *
 *      True if file belongs to a user ID for which the equivalent
 *      of the getpwuid() 9.2.2 [POSIX.1] function returns NULL.
 */
int
f_nouser(PLAN *plan, FTSENT *entry)
{

        return (user_from_uid(entry->fts_statp->st_uid, 1) ? 0 : 1);
}

PLAN *
c_nouser(char ***argvp, int isok, char *opt)
{
        ftsoptions &= ~FTS_NOSTAT;

        return (palloc(N_NOUSER, f_nouser));
}

/*
 * -path functions --
 *
 *      True if the path of the filename being examined
 *      matches pattern using Pattern Matching Notation S3.14
 */
int
f_path(PLAN *plan, FTSENT *entry)
{

        return (!fnmatch(plan->c_data, entry->fts_path, 0));
}

PLAN *
c_path(char ***argvp, int isok, char *opt)
{
        char *pattern = **argvp;
        PLAN *new;

        (*argvp)++;
        new = palloc(N_NAME, f_path);
        new->c_data = pattern;
        return (new);
}

/*
 * -perm functions --
 *
 *      The mode argument is used to represent file mode bits.  If it starts
 *      with a leading digit, it's treated as an octal mode, otherwise as a
 *      symbolic mode.
 */
int
f_perm(PLAN *plan, FTSENT *entry)
{
        mode_t mode;

        mode = entry->fts_statp->st_mode &
            (S_ISUID|S_ISGID|S_ISTXT|S_IRWXU|S_IRWXG|S_IRWXO);
        if (plan->flags == F_ATLEAST)
                return ((plan->m_data | mode) == mode);
        else
                return (mode == plan->m_data);
        /* NOTREACHED */
}

PLAN *
c_perm(char ***argvp, int isok, char *opt)
{
        char *perm = **argvp;
        PLAN *new;
        mode_t *set;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_PERM, f_perm);

        if (*perm == '-') {
                new->flags = F_ATLEAST;
                ++perm;
        }

        if ((set = setmode(perm)) == NULL)
                err(1, "%s: Cannot set file mode `%s'", opt, perm);

        new->m_data = getmode(set, 0);
        free(set);
        return (new);
}

/*
 * -print functions --
 *
 *      Always true, causes the current pathname to be written to
 *      standard output.
 */
int
f_print(PLAN *plan, FTSENT *entry)
{

        (void)printf("%s\n", entry->fts_path);
        return (1);
}

int
f_print0(PLAN *plan, FTSENT *entry)
{

        (void)fputs(entry->fts_path, stdout);
        (void)fputc('\0', stdout);
        return (1);
}

int
f_printx(PLAN *plan, FTSENT *entry)
{
        char *cp;

        for (cp = entry->fts_path; *cp; cp++) {
                if (*cp == '\'' || *cp == '\"' || *cp == ' ' ||
                    *cp == '$'  || *cp == '`'  ||
                    *cp == '\t' || *cp == '\n' || *cp == '\\')
                        fputc('\\', stdout);

                fputc(*cp, stdout);
        }

        fputc('\n', stdout);
        return (1);
}

PLAN *
c_print(char ***argvp, int isok, char *opt)
{

        isoutput = 1;

        return (palloc(N_PRINT, f_print));
}

PLAN *
c_print0(char ***argvp, int isok, char *opt)
{

        isoutput = 1;

        return (palloc(N_PRINT0, f_print0));
}

PLAN *
c_printx(char ***argvp, int isok, char *opt)
{

        isoutput = 1;

        return (palloc(N_PRINTX, f_printx));
}

/*
 * -prune functions --
 *
 *      Prune a portion of the hierarchy.
 */
int
f_prune(PLAN *plan, FTSENT *entry)
{
        if (fts_set(tree, entry, FTS_SKIP))
                err(1, "%s", entry->fts_path);
        return (1);
}

PLAN *
c_prune(char ***argvp, int isok, char *opt)
{

        return (palloc(N_PRUNE, f_prune));
}

/*
 * -regex regexp (and related) functions --
 *
 *      True if the complete file path matches the regular expression regexp.
 *      For -regex, regexp is a case-sensitive (basic) regular expression.
 *      For -iregex, regexp is a case-insensitive (basic) regular expression.
 */
int
f_regex(PLAN *plan, FTSENT *entry)
{

        return (regexec(&plan->regexp_data, entry->fts_path, 0, NULL, 0) == 0);
}

static PLAN *
c_regex_common(char ***argvp, int isok, enum ntype type, bool icase)
{
        char errbuf[LINE_MAX];
        regex_t reg;
        char *regexp = **argvp;
        char *lineregexp;
        PLAN *new;
        int rv;
        size_t len;

        (*argvp)++;

        len = strlen(regexp) + 1 + 6;
        lineregexp = malloc(len);       /* max needed */
        if (lineregexp == NULL)
                err(1, NULL);
        snprintf(lineregexp, len, "^%s(%s%s)$",
            (regcomp_flags & REG_EXTENDED) ? "" : "\\", regexp,
            (regcomp_flags & REG_EXTENDED) ? "" : "\\");
        rv = regcomp(&reg, lineregexp, REG_NOSUB|regcomp_flags|
            (icase ? REG_ICASE : 0));
        free(lineregexp);
        if (rv != 0) {
                regerror(rv, &reg, errbuf, sizeof errbuf);
                errx(1, "regexp %s: %s", regexp, errbuf);
        }

        new = palloc(type, f_regex);
        new->regexp_data = reg;
        return (new);
}

PLAN *
c_regex(char ***argvp, int isok, char *opt)
{

        return (c_regex_common(argvp, isok, N_REGEX, false));
}

PLAN *
c_iregex(char ***argvp, int isok, char *opt)
{

        return (c_regex_common(argvp, isok, N_IREGEX, true));
}

/*
 * -since "timestamp" functions --
 *
 *      True if the file modification time is greater than the timestamp value
 */
int
f_since(PLAN *plan, FTSENT *entry)
{
        COMPARE(entry->fts_statp->st_mtime, plan->t_data);
}

PLAN *
c_since(char ***argvp, int isok, char *opt)
{
        char *arg = **argvp;
        PLAN *new;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_SINCE, f_since);
        new->t_data = find_parsedate(new, opt, arg);
        new->flags = F_GREATER;
        return (new);
}

/*
 * -size n[c] functions --
 *
 *      True if the file size in bytes, divided by an implementation defined
 *      value and rounded up to the next integer, is n.  If n is followed by
 *      a c, the size is in bytes.
 */
#define FIND_SIZE       512
static int divsize = 1;

int
f_size(PLAN *plan, FTSENT *entry)
{
        off_t size;

        size = divsize ? (entry->fts_statp->st_size + FIND_SIZE - 1) /
            FIND_SIZE : entry->fts_statp->st_size;
        COMPARE(size, plan->o_data);
}

PLAN *
c_size(char ***argvp, int isok, char *opt)
{
        char *arg = **argvp;
        PLAN *new;
        char endch;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_SIZE, f_size);
        endch = 'c';
        new->o_data = find_parsenum(new, opt, arg, &endch);
        if (endch == 'c')
                divsize = 0;
        return (new);
}

/*
 * -type c functions --
 *
 *      True if the type of the file is c, where c is b, c, d, p, f or w
 *      for block special file, character special file, directory, FIFO,
 *      regular file or whiteout respectively.
 */
int
f_type(PLAN *plan, FTSENT *entry)
{

        return ((entry->fts_statp->st_mode & S_IFMT) == plan->m_data);
}

PLAN *
c_type(char ***argvp, int isok, char *opt)
{
        char *typestring = **argvp;
        PLAN *new;
        mode_t  mask = (mode_t)0;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        switch (typestring[0]) {
        case 'b':
                mask = S_IFBLK;
                break;
        case 'c':
                mask = S_IFCHR;
                break;
        case 'd':
                mask = S_IFDIR;
                break;
        case 'f':
                mask = S_IFREG;
                break;
        case 'l':
                mask = S_IFLNK;
                break;
        case 'p':
                mask = S_IFIFO;
                break;
        case 's':
                mask = S_IFSOCK;
                break;
#ifdef S_IFWHT
        case 'W':
        case 'w':
                mask = S_IFWHT;
#ifdef FTS_WHITEOUT
                ftsoptions |= FTS_WHITEOUT;
#endif
                break;
#endif /* S_IFWHT */
        default:
                errx(1, "%s: %s: unknown type", opt, typestring);
        }

        new = palloc(N_TYPE, f_type);
        new->m_data = mask;
        return (new);
}

/*
 * -user uname functions --
 *
 *      True if the file belongs to the user uname.  If uname is numeric and
 *      an equivalent of the getpwnam() S9.2.2 [POSIX.1] function does not
 *      return a valid user name, uname is taken as a user ID.
 */
int
f_user(PLAN *plan, FTSENT *entry)
{

        COMPARE(entry->fts_statp->st_uid, plan->u_data);
}

PLAN *
c_user(char ***argvp, int isok, char *opt)
{
        char *username = **argvp;
        PLAN *new;
        struct passwd *p;
        uid_t uid;

        (*argvp)++;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(N_USER, f_user);
        p = getpwnam(username);
        if (p == NULL) {
                if (atoi(username) == 0 && username[0] != '0' &&
                    strcmp(username, "+0") && strcmp(username, "-0"))
                        errx(1, "%s: %s: no such user", opt, username);
                uid = find_parsenum(new, opt, username, NULL);

        } else {
                new->flags = F_EQUAL;
                uid = p->pw_uid;
        }

        new->u_data = uid;
        return (new);
}

/*
 * -xdev functions --
 *
 *      Always true, causes find not to descend past directories that have a
 *      different device ID (st_dev, see stat() S5.6.2 [POSIX.1])
 */
PLAN *
c_xdev(char ***argvp, int isok, char *opt)
{
        ftsoptions |= FTS_XDEV;

        return (palloc(N_XDEV, f_always_true));
}

/*
 * ( expression ) functions --
 *
 *      True if expression is true.
 */
int
f_expr(PLAN *plan, FTSENT *entry)
{
        PLAN *p;
        int state;

        state = 0;
        for (p = plan->p_data[0];
            p && (state = (p->eval)(p, entry)); p = p->next);
        return (state);
}

/*
 * N_OPENPAREN and N_CLOSEPAREN nodes are temporary place markers.  They are
 * eliminated during phase 2 of find_formplan() --- the '(' node is converted
 * to a N_EXPR node containing the expression and the ')' node is discarded.
 */
PLAN *
c_openparen(char ***argvp, int isok, char *opt)
{

        return (palloc(N_OPENPAREN, (int (*)(PLAN *, FTSENT *))-1));
}

PLAN *
c_closeparen(char ***argvp, int isok, char *opt)
{

        return (palloc(N_CLOSEPAREN, (int (*)(PLAN *, FTSENT *))-1));
}

/*
 * ! expression functions --
 *
 *      Negation of a primary; the unary NOT operator.
 */
int
f_not(PLAN *plan, FTSENT *entry)
{
        PLAN *p;
        int state;

        state = 0;
        for (p = plan->p_data[0];
            p && (state = (p->eval)(p, entry)); p = p->next);
        return (!state);
}

PLAN *
c_not(char ***argvp, int isok, char *opt)
{

        return (palloc(N_NOT, f_not));
}

/*
 * expression -o expression functions --
 *
 *      Alternation of primaries; the OR operator.  The second expression is
 * not evaluated if the first expression is true.
 */
int
f_or(PLAN *plan, FTSENT *entry)
{
        PLAN *p;
        int state;

        state = 0;
        for (p = plan->p_data[0];
            p && (state = (p->eval)(p, entry)); p = p->next);

        if (state)
                return (1);

        for (p = plan->p_data[1];
            p && (state = (p->eval)(p, entry)); p = p->next);
        return (state);
}

PLAN *
c_or(char ***argvp, int isok, char *opt)
{

        return (palloc(N_OR, f_or));
}

PLAN *
c_null(char ***argvp, int isok, char *opt)
{

        return (NULL);
}


/*
 * plan_cleanup --
 *      Check and see if the specified plan has any residual state,
 *      and if so, clean it up as appropriate.
 *
 *      At the moment, only N_EXEC has state. Two kinds: 1)
 *      lists of files to feed to subprocesses 2) State on exit
 *      status of past subprocesses.
 */
/* ARGSUSED1 */
int
plan_cleanup(PLAN *plan, void *arg)
{
        if (plan->type==N_EXEC && plan->ep_narg)
                run_f_exec(plan);

        return plan->ep_rval;           /* Passed save exit-status up chain */
}

static PLAN *
palloc(enum ntype t, int (*f)(PLAN *, FTSENT *))
{
        PLAN *new;

        if ((new = malloc(sizeof(PLAN))) == NULL)
                err(1, NULL);
        memset(new, 0, sizeof(PLAN));
        new->type = t;
        new->eval = f;
        return (new);
}