/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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/param.h>
#include <sys/ucred.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/acl.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 <limits.h>
#include <pwd.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>

#include "find.h"

static PLAN *palloc(OPTION *);
static long long find_parsenum(PLAN *, const char *, char *, char *);
static long long find_parsetime(PLAN *, const char *, char *);
static char *nextarg(OPTION *, char ***);

extern char **environ;

static PLAN *lastexecplus = NULL;

#define COMPARE(a, b) do {                                              \
        switch (plan->flags & F_ELG_MASK) {                             \
        case F_EQUAL:                                                   \
                return (a == b);                                        \
        case F_LESSTHAN:                                                \
                return (a < b);                                         \
        case F_GREATER:                                                 \
                return (a > b);                                         \
        default:                                                        \
                abort();                                                \
        }                                                               \
} while(0)

static PLAN *
palloc(OPTION *option)
{
        PLAN *new;

        if ((new = malloc(sizeof(PLAN))) == NULL)
                err(1, NULL);
        new->execute = option->execute;
        new->flags = option->flags;
        new->next = NULL;
        return new;
}

/*
 * find_parsenum --
 *      Parse a string of the form [+-]# and return the value.
 */
static long long
find_parsenum(PLAN *plan, const char *option, char *vp, char *endch)
{
        long long value;
        char *endchar, *str;    /* 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 strtoq().  Note, if strtoq() returns zero
         * and endchar points to the beginning of the string we know we have
         * a syntax error.
         */
        value = strtoq(str, &endchar, 10);
        if (value == 0 && endchar == str)
                errx(1, "%s: %s: illegal numeric value", option, vp);
        if (endchar[0] && endch == NULL)
                errx(1, "%s: %s: illegal trailing character", option, vp);
        if (endch)
                *endch = endchar[0];
        return value;
}

/*
 * find_parsetime --
 *      Parse a string of the form [+-]([0-9]+[smhdw]?)+ and return the value.
 */
static long long
find_parsetime(PLAN *plan, const char *option, char *vp)
{
        long long secs, value;
        char *str, *unit;       /* 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;
        }

        value = strtoq(str, &unit, 10);
        if (value == 0 && unit == str) {
                errx(1, "%s: %s: illegal time value", option, vp);
                /* NOTREACHED */
        }
        if (*unit == '\0')
                return value;

        /* Units syntax. */
        secs = 0;
        for (;;) {
                switch(*unit) {
                case 's':       /* seconds */
                        secs += value;
                        break;
                case 'm':       /* minutes */
                        secs += value * 60;
                        break;
                case 'h':       /* hours */
                        secs += value * 3600;
                        break;
                case 'd':       /* days */
                        secs += value * 86400;
                        break;
                case 'w':       /* weeks */
                        secs += value * 604800;
                        break;
                default:
                        errx(1, "%s: %s: bad unit '%c'", option, vp, *unit);
                        /* NOTREACHED */
                }
                str = unit + 1;
                if (*str == '\0')       /* EOS */
                        break;
                value = strtoq(str, &unit, 10);
                if (value == 0 && unit == str) {
                        errx(1, "%s: %s: illegal time value", option, vp);
                        /* NOTREACHED */
                }
                if (*unit == '\0') {
                        errx(1, "%s: %s: missing trailing unit", option, vp);
                        /* NOTREACHED */
                }
        }
        plan->flags |= F_EXACTTIME;
        return secs;
}

/*
 * nextarg --
 *      Check that another argument still exists, return a pointer to it,
 *      and increment the argument vector pointer.
 */
static char *
nextarg(OPTION *option, char ***argvp)
{
        char *arg;

        if ((arg = **argvp) == NULL)
                errx(1, "%s: requires additional arguments", option->name);
        (*argvp)++;
        return arg;
} /* nextarg() */

/*
 * The value of n for the inode times (atime, birthtime, ctime, 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) \
        if (((p)->flags & F_ELG_MASK) == F_LESSTHAN) \
                ++((p)->t_data.tv_sec);

/*
 * -[acm]min n functions --
 *
 *    True if the difference between the
 *              file access time (-amin)
 *              file birth time (-Bmin)
 *              last change of file status information (-cmin)
 *              file modification time (-mmin)
 *    and the current time is n min periods.
 */
int
f_Xmin(PLAN *plan, FTSENT *entry)
{
        if (plan->flags & F_TIME_C) {
                COMPARE((now - entry->fts_statp->st_ctime +
                    60 - 1) / 60, plan->t_data.tv_sec);
        } else if (plan->flags & F_TIME_A) {
                COMPARE((now - entry->fts_statp->st_atime +
                    60 - 1) / 60, plan->t_data.tv_sec);
#if HAVE_STRUCT_STAT_ST_BIRTHTIME
        } else if (plan->flags & F_TIME_B) {
                COMPARE((now - entry->fts_statp->st_birthtime +
                    60 - 1) / 60, plan->t_data.tv_sec);
#endif
        } else {
                COMPARE((now - entry->fts_statp->st_mtime +
                    60 - 1) / 60, plan->t_data.tv_sec);
        }
}

PLAN *
c_Xmin(OPTION *option, char ***argvp)
{
        char *nmins;
        PLAN *new;

        nmins = nextarg(option, argvp);
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(option);
        new->t_data.tv_sec = find_parsenum(new, option->name, nmins, NULL);
        new->t_data.tv_nsec = 0;
        TIME_CORRECT(new);
        return new;
}

/*
 * -[acm]time n functions --
 *
 *      True if the difference between the
 *              file access time (-atime)
 *              file birth time (-Btime)
 *              last change of file status information (-ctime)
 *              file modification time (-mtime)
 *      and the current time is n 24 hour periods.
 */

int
f_Xtime(PLAN *plan, FTSENT *entry)
{
        time_t xtime;

        if (plan->flags & F_TIME_A)
                xtime = entry->fts_statp->st_atime;
#if HAVE_STRUCT_STAT_ST_BIRTHTIME
        else if (plan->flags & F_TIME_B)
                xtime = entry->fts_statp->st_birthtime;
#endif
        else if (plan->flags & F_TIME_C)
                xtime = entry->fts_statp->st_ctime;
        else
                xtime = entry->fts_statp->st_mtime;

        if (plan->flags & F_EXACTTIME)
                COMPARE(now - xtime, plan->t_data.tv_sec);
        else
                COMPARE((now - xtime + 86400 - 1) / 86400, plan->t_data.tv_sec);
}

PLAN *
c_Xtime(OPTION *option, char ***argvp)
{
        char *value;
        PLAN *new;

        value = nextarg(option, argvp);
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(option);
        new->t_data.tv_sec = find_parsetime(new, option->name, value);
        new->t_data.tv_nsec = 0;
        if (!(new->flags & F_EXACTTIME))
                TIME_CORRECT(new);
        return new;
}

/*
 * -maxdepth/-mindepth n functions --
 *
 *        Does the same as -prune if the level of the current file is
 *        greater/less than the specified maximum/minimum depth.
 *
 *        Note that -maxdepth and -mindepth are handled specially in
 *        find_execute() so their f_* functions are set to f_always_true().
 */
PLAN *
c_mXXdepth(OPTION *option, char ***argvp)
{
        char *dstr;
        PLAN *new;

        dstr = nextarg(option, argvp);
        if (dstr[0] == '-')
                /* all other errors handled by find_parsenum() */
                errx(1, "%s: %s: value must be positive", option->name, dstr);

        new = palloc(option);
        if (option->flags & F_MAXDEPTH)
                maxdepth = find_parsenum(new, option->name, dstr, NULL);
        else
                mindepth = find_parsenum(new, option->name, dstr, NULL);
        return new;
}

#ifdef ACL_TYPE_NFS4
/*
 * -acl function --
 *
 *      Show files with EXTENDED ACL attributes.
 */
int
f_acl(PLAN *plan __unused, FTSENT *entry)
{
        acl_t facl;
        acl_type_t acl_type;
        int acl_supported = 0, ret, trivial;

        if (S_ISLNK(entry->fts_statp->st_mode))
                return 0;
        ret = pathconf(entry->fts_accpath, _PC_ACL_NFS4);
        if (ret > 0) {
                acl_supported = 1;
                acl_type = ACL_TYPE_NFS4;
        } else if (ret < 0 && errno != EINVAL) {
                warn("%s", entry->fts_accpath);
                return (0);
        }
        if (acl_supported == 0) {
                ret = pathconf(entry->fts_accpath, _PC_ACL_EXTENDED);
                if (ret > 0) {
                        acl_supported = 1;
                        acl_type = ACL_TYPE_ACCESS;
                } else if (ret < 0 && errno != EINVAL) {
                        warn("%s", entry->fts_accpath);
                        return (0);
                }
        }
        if (acl_supported == 0)
                return (0);

        facl = acl_get_file(entry->fts_accpath, acl_type);
        if (facl == NULL) {
                warn("%s", entry->fts_accpath);
                return (0);
        }
        ret = acl_is_trivial_np(facl, &trivial);
        acl_free(facl);
        if (ret) {
                warn("%s", entry->fts_accpath);
                return (0);
        }
        if (trivial)
                return (0);
        return (1);
}
#endif

PLAN *
c_acl(OPTION *option, char ***argvp __unused)
{
        ftsoptions &= ~FTS_NOSTAT;
        return (palloc(option));
}

/*
 * -delete functions --
 *
 *      True always.  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 */
                errx(1, "-delete: insecure options got turned on");

        if (!(ftsoptions & FTS_PHYSICAL) ||     /* physical off */
            (ftsoptions & FTS_LOGICAL))         /* or finally, logical on */
                errx(1, "-delete: forbidden when symlinks are followed");

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

#if HAVE_STRUCT_STAT_ST_FLAGS
        /* 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)
                lchflags(entry->fts_accpath,
                       entry->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
#endif

        /* 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(OPTION *option, char ***argvp __unused)
{

        ftsoptions &= ~FTS_NOSTAT;      /* no optimise */
        isoutput = 1;                   /* possible output */
        isdepth = 1;                    /* -depth implied */

        /*
         * Try to avoid the confusing error message about relative paths
         * being potentially not safe.
         */
        if (ftsoptions & FTS_NOCHDIR)
                errx(1, "%s: forbidden when the current directory cannot be opened",
                    "-delete");

        return palloc(option);
}


/*
 * always_true --
 *
 *      Always true, used for -maxdepth, -mindepth, -xdev, -follow, and -true
 */
int
f_always_true(PLAN *plan __unused, FTSENT *entry __unused)
{
        return 1;
}

/*
 * -depth functions --
 *
 *      With argument: True if the file is at level n.
 *      Without argument: 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_depth(PLAN *plan, FTSENT *entry)
{
        if (plan->flags & F_DEPTH)
                COMPARE(entry->fts_level, plan->d_data);
        else
                return 1;
}

PLAN *
c_depth(OPTION *option, char ***argvp)
{
        PLAN *new;
        char *str;

        new = palloc(option);

        str = **argvp;
        if (str && !(new->flags & F_DEPTH)) {
                /* skip leading + or - */
                if (*str == '+' || *str == '-')
                        str++;
                /* skip sign */
                if (*str == '+' || *str == '-')
                        str++;
                if (isdigit(*str))
                        new->flags |= F_DEPTH;
        }

        if (new->flags & F_DEPTH) {     /* -depth n */
                char *ndepth;

                ndepth = nextarg(option, argvp);
                new->d_data = find_parsenum(new, option->name, ndepth, NULL);
        } else {                        /* -d */
                isdepth = 1;
        }

        return new;
}
 
/*
 * -empty functions --
 *
 *      True if the file or directory is empty
 */
int
f_empty(PLAN *plan __unused, 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(OPTION *option, char ***argvp __unused)
{
        ftsoptions &= ~FTS_NOSTAT;

        return palloc(option);
}

/*
 * [-exec | -execdir | -ok] 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 current pathname,
 *      or, in the case of -execdir, the current basename (filename
 *      without leading directory prefix). For -exec and -ok,
 *      the current directory for the execution of utility is the same as
 *      the current directory when the find utility was started, whereas
 *      for -execdir, it is the directory the file resides in.
 *
 *      The primary -ok differs from -exec in that it requests affirmation
 *      of the user before executing the utility.
 */
int
f_exec(PLAN *plan, FTSENT *entry)
{
        int cnt;
        pid_t pid;
        int status;
        char *file;

        if (entry == NULL && plan->flags & F_EXECPLUS) {
                if (plan->e_ppos == plan->e_pbnum)
                        return (1);
                plan->e_argv[plan->e_ppos] = NULL;
                goto doexec;
        }

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

        if (plan->flags & F_EXECPLUS) {
                if ((plan->e_argv[plan->e_ppos] = strdup(file)) == NULL)
                        err(1, NULL);
                plan->e_len[plan->e_ppos] = strlen(file);
                plan->e_psize += plan->e_len[plan->e_ppos];
                if (++plan->e_ppos < plan->e_pnummax &&
                    plan->e_psize < plan->e_psizemax)
                        return (1);
                plan->e_argv[plan->e_ppos] = NULL;
        } else {
                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]);
        }

doexec: if ((plan->flags & F_NEEDOK) && !queryuser(plan->e_argv))
                return 0;

        /* make sure find output is interspersed correctly with subprocesses */
        fflush(stdout);
        fflush(stderr);

        switch (pid = fork()) {
        case -1:
                err(1, "fork");
                /* NOTREACHED */
        case 0:
                /* change dir back from where we started */
                if (!(plan->flags & F_EXECDIR) &&
                    !(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);
        }
        if (plan->flags & F_EXECPLUS) {
                while (--plan->e_ppos >= plan->e_pbnum)
                        free(plan->e_argv[plan->e_ppos]);
                plan->e_ppos = plan->e_pbnum;
                plan->e_psize = plan->e_pbsize;
        }
        pid = waitpid(pid, &status, 0);
        if (pid != -1 && WIFEXITED(status) && !WEXITSTATUS(status))
                return (1);
        if (plan->flags & F_EXECPLUS) {
                exitstatus = 1;
                return (1);
        }
        return (0);
}

/*
 * c_exec, c_execdir, c_ok --
 *      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_exec(OPTION *option, char ***argvp)
{
        PLAN *new;                      /* node returned */
        long argmax;
        int cnt, i;
        char **argv, **ap, **ep, *p;

        /* This would defeat -execdir's intended security. */
        if (option->flags & F_EXECDIR && ftsoptions & FTS_NOCHDIR)
                errx(1, "%s: forbidden when the current directory cannot be opened",
                    "-execdir");

        /* XXX - was in c_execdir, but seems unnecessary!?
        ftsoptions &= ~FTS_NOSTAT;
        */
        isoutput = 1;

        /* XXX - this is a change from the previous coding */
        new = palloc(option);

        for (ap = argv = *argvp;; ++ap) {
                if (!*ap)
                        errx(1,
                            "%s: no terminating \";\" or \"+\"", option->name);
                if (**ap == ';')
                        break;
                if (**ap == '+' && ap != argv && strcmp(*(ap - 1), "{}") == 0) {
                        new->flags |= F_EXECPLUS;
                        break;
                }
        }

        if (ap == argv)
                errx(1, "%s: no command specified", option->name);

        cnt = ap - *argvp + 1;
        if (new->flags & F_EXECPLUS) {
                new->e_ppos = new->e_pbnum = cnt - 2;
                if ((argmax = sysconf(_SC_ARG_MAX)) == -1) {
                        warn("sysconf(_SC_ARG_MAX)");
                        argmax = _POSIX_ARG_MAX;
                }
                argmax -= 1024;
                for (ep = environ; *ep != NULL; ep++)
                        argmax -= strlen(*ep) + 1 + sizeof(*ep);
                argmax -= 1 + sizeof(*ep);
                /*
                 * Ensure that -execdir ... {} + does not mix files
                 * from different directories in one invocation.
                 * Files from the same directory should be handled
                 * in one invocation but there is no code for it.
                 */
                new->e_pnummax = new->flags & F_EXECDIR ? 1 : argmax / 16;
                argmax -= sizeof(char *) * new->e_pnummax;
                if (argmax <= 0)
                        errx(1, "no space for arguments");
                new->e_psizemax = argmax;
                new->e_pbsize = 0;
                cnt += new->e_pnummax + 1;
                new->e_next = lastexecplus;
                lastexecplus = new;
        }
        if ((new->e_argv = malloc(cnt * sizeof(char *))) == NULL)
                err(1, NULL);
        if ((new->e_orig = malloc(cnt * sizeof(char *))) == NULL)
                err(1, NULL);
        if ((new->e_len = malloc(cnt * sizeof(int))) == NULL)
                err(1, NULL);

        for (argv = *argvp, cnt = 0; argv < ap; ++argv, ++cnt) {
                new->e_orig[cnt] = *argv;
                if (new->flags & F_EXECPLUS)
                        new->e_pbsize += strlen(*argv) + 1;
                for (p = *argv; *p; ++p)
                        if (!(new->flags & F_EXECPLUS) && p[0] == '{' &&
                            p[1] == '}') {
                                if ((new->e_argv[cnt] =
                                    malloc(MAXPATHLEN)) == NULL)
                                        err(1, NULL);
                                new->e_len[cnt] = MAXPATHLEN;
                                break;
                        }
                if (!*p) {
                        new->e_argv[cnt] = *argv;
                        new->e_len[cnt] = 0;
                }
        }
        if (new->flags & F_EXECPLUS) {
                new->e_psize = new->e_pbsize;
                cnt--;
                for (i = 0; i < new->e_pnummax; i++) {
                        new->e_argv[cnt] = NULL;
                        new->e_len[cnt] = 0;
                        cnt++;
                }
                argv = ap;
                goto done;
        }
        new->e_argv[cnt] = new->e_orig[cnt] = NULL;

done:   *argvp = argv + 1;
        return new;
}

/* Finish any pending -exec ... {} + functions. */
void
finish_execplus(void)
{
        PLAN *p;

        p = lastexecplus;
        while (p != NULL) {
                (p->execute)(p, NULL);
                p = p->e_next;
        }
}

#if HAVE_STRUCT_STAT_ST_FLAGS
int
f_flags(PLAN *plan, FTSENT *entry)
{
        u_long flags;

        flags = entry->fts_statp->st_flags;
        if (plan->flags & F_ATLEAST)
                return (flags | plan->fl_flags) == flags &&
                    !(flags & plan->fl_notflags);
        else if (plan->flags & F_ANY)
                return (flags & plan->fl_flags) ||
                    (flags | plan->fl_notflags) != flags;
        else
                return flags == plan->fl_flags &&
                    !(plan->fl_flags & plan->fl_notflags);
}

PLAN *
c_flags(OPTION *option, char ***argvp)
{
        char *flags_str;
        PLAN *new;
        u_long flags, notflags;

        flags_str = nextarg(option, argvp);
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(option);

        if (*flags_str == '-') {
                new->flags |= F_ATLEAST;
                flags_str++;
        } else if (*flags_str == '+') {
                new->flags |= F_ANY;
                flags_str++;
        }
        if (strtofflags(&flags_str, &flags, &notflags) == 1)
                errx(1, "%s: %s: illegal flags string", option->name, flags_str);

        new->fl_flags = flags;
        new->fl_notflags = notflags;
        return new;
}
#endif

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

        return palloc(option);
}

/*
 * -fprint functions --
 *
 *      Always true, causes the current pathname to be written to
 *      specified file followed by a newline
 */
int
f_fprint(PLAN *plan, FTSENT *entry)
{
        fprintf(plan->fprint_file, "%s\n", entry->fts_path);
        return 1;
}

PLAN *
c_fprint(OPTION *option, char ***argvp)
{
        PLAN *new;
        char *fn;

        isoutput = 1;

        new = palloc(option);
        fn = nextarg(option, argvp);
        new->fprint_file = fopen(fn, "w");
        if (new->fprint_file == NULL)
                err(1, "fprint: cannot create %s", fn);

        return (new);
}

/*
 * -fprint0 functions --
 *
 *      Always true, causes the current pathname to be written to
 *      specified file followed by a NUL
 */
int
f_fprint0(PLAN *plan, FTSENT *entry)
{
        fprintf(plan->fprint_file, "%s%c", entry->fts_path, '\0');
        return 1;
}

#if HAVE_STRUCT_STATFS_F_FSTYPENAME
/*
 * -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 statfs sb;
        static int val_flags;
        static char fstype[sizeof(sb.f_fstypename)];
        char *p, save[2] = {0,0};

        if ((plan->flags & F_MTMASK) == F_MTUNKNOWN)
                return 0;

        /* 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 filesystem,
                 * 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 (statfs(entry->fts_accpath, &sb)) {
                        if (!ignore_readdir_race || errno != ENOENT) {
                                warn("statfs: %s", entry->fts_accpath);
                                exitstatus = 1;
                        }
                        return 0;
                }

                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_flags = sb.f_flags;
                strlcpy(fstype, sb.f_fstypename, sizeof(fstype));
        }
        switch (plan->flags & F_MTMASK) {
        case F_MTFLAG:
                return val_flags & plan->mt_data;
        case F_MTTYPE:
                return (strncmp(fstype, plan->c_data, sizeof(fstype)) == 0);
        default:
                abort();
        }
}

PLAN *
c_fstype(OPTION *option, char ***argvp)
{
        char *fsname;
        PLAN *new;

        fsname = nextarg(option, argvp);
        ftsoptions &= ~FTS_NOSTAT;

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

        new->flags |= F_MTTYPE;
        new->c_data = fsname;
        return new;
}
#endif

/*
 * -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(OPTION *option, char ***argvp)
{
        char *gname;
        PLAN *new;
        struct group *g;
        gid_t gid;

        gname = nextarg(option, argvp);
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(option);
        g = getgrnam(gname);
        if (g == NULL) {
                char* cp = gname;
                if (gname[0] == '-' || gname[0] == '+')
                        gname++;
                gid = atoi(gname);
                if (gid == 0 && gname[0] != '0')
                        errx(1, "%s: %s: no such group", option->name, gname);
                gid = find_parsenum(new, option->name, cp, NULL);
        } else
                gid = g->gr_gid;

        new->g_data = gid;
        return new;
}

/*
 * -ignore_readdir_race functions --
 *
 *      Always true. Ignore errors which occur if a file or a directory
 *      in a starting point gets deleted between reading the name and calling
 *      stat on it while find is traversing the starting point.
 */

PLAN *
c_ignore_readdir_race(OPTION *option, char ***argvp __unused)
{
        if (strcmp(option->name, "-ignore_readdir_race") == 0)
                ignore_readdir_race = 1;
        else
                ignore_readdir_race = 0;

        return palloc(option);
}

/*
 * -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(OPTION *option, char ***argvp)
{
        char *inum_str;
        PLAN *new;

        inum_str = nextarg(option, argvp);
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(option);
        new->i_data = find_parsenum(new, option->name, inum_str, NULL);
        return new;
}

/*
 * -samefile FN
 *
 *      True if the file has the same inode (eg hard link) FN
 */

/* f_samefile is just f_inum */
PLAN *
c_samefile(OPTION *option, char ***argvp)
{
        char *fn;
        PLAN *new;
        struct stat sb;
        int error;

        fn = nextarg(option, argvp);
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(option);
        if (ftsoptions & FTS_PHYSICAL)
                error = lstat(fn, &sb);
        else
                error = stat(fn, &sb);
        if (error != 0)
                err(1, "%s", fn);
        new->i_data = sb.st_ino;
        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(OPTION *option, char ***argvp)
{
        char *nlinks;
        PLAN *new;

        nlinks = nextarg(option, argvp);
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(option);
        new->l_data = (nlink_t)find_parsenum(new, option->name, nlinks, NULL);
        return new;
}

/*
 * -ls functions --
 *
 *      Always true - prints the current entry to stdout in "ls" format.
 */
int
f_ls(PLAN *plan __unused, FTSENT *entry)
{
        printlong(entry->fts_path, entry->fts_accpath, entry->fts_statp);
        return 1;
}

PLAN *
c_ls(OPTION *option, char ***argvp __unused)
{
        ftsoptions &= ~FTS_NOSTAT;
        isoutput = 1;

        return palloc(option);
}

/*
 * -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)
{
        char fn[PATH_MAX];
        const char *name;
        ssize_t len;

        if (plan->flags & F_LINK) {
                /*
                 * The below test both avoids obviously useless readlink()
                 * calls and ensures that symlinks with existent target do
                 * not match if symlinks are being followed.
                 * Assumption: fts will stat all symlinks that are to be
                 * followed and will return the stat information.
                 */
                if (entry->fts_info != FTS_NSOK && entry->fts_info != FTS_SL &&
                    entry->fts_info != FTS_SLNONE)
                        return 0;
                len = readlink(entry->fts_accpath, fn, sizeof(fn) - 1);
                if (len == -1)
                        return 0;
                fn[len] = '\0';
                name = fn;
        } else
                name = entry->fts_name;
        return !fnmatch(plan->c_data, name,
            plan->flags & F_IGNCASE ? FNM_CASEFOLD : 0);
}

PLAN *
c_name(OPTION *option, char ***argvp)
{
        char *pattern;
        PLAN *new;

        pattern = nextarg(option, argvp);
        new = palloc(option);
        new->c_data = pattern;
        return new;
}

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

        if (plan->flags & F_TIME_C)
                ft = entry->fts_statp->st_ctim;
#if HAVE_STRUCT_STAT_ST_BIRTHTIME
        else if (plan->flags & F_TIME_A)
                ft = entry->fts_statp->st_atim;
        else if (plan->flags & F_TIME_B)
                ft = entry->fts_statp->st_birthtim;
#endif
        else
                ft = entry->fts_statp->st_mtim;
        return (ft.tv_sec > plan->t_data.tv_sec ||
            (ft.tv_sec == plan->t_data.tv_sec &&
            ft.tv_nsec > plan->t_data.tv_nsec));
}

PLAN *
c_newer(OPTION *option, char ***argvp)
{
        char *fn_or_tspec;
        PLAN *new;
        struct stat sb;
        int error;

        fn_or_tspec = nextarg(option, argvp);
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(option);
        /* compare against what */
        if (option->flags & F_TIME2_T) {
                new->t_data.tv_sec = get_date(fn_or_tspec);
                if (new->t_data.tv_sec == (time_t) -1)
                        errx(1, "Can't parse date/time: %s", fn_or_tspec);
                /* Use the seconds only in the comparison. */
                new->t_data.tv_nsec = 999999999;
        } else {
                if (ftsoptions & FTS_PHYSICAL)
                        error = lstat(fn_or_tspec, &sb);
                else
                        error = stat(fn_or_tspec, &sb);
                if (error != 0)
                        err(1, "%s", fn_or_tspec);
                if (option->flags & F_TIME2_C)
                        new->t_data = sb.st_ctim;
                else if (option->flags & F_TIME2_A)
                        new->t_data = sb.st_atim;
#if HAVE_STRUCT_STAT_ST_BIRTHTIME
                else if (option->flags & F_TIME2_B)
                        new->t_data = sb.st_birthtim;
#endif
                else
                        new->t_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 __unused, FTSENT *entry)
{
        return group_from_gid(entry->fts_statp->st_gid, 1) == NULL;
}

PLAN *
c_nogroup(OPTION *option, char ***argvp __unused)
{
        ftsoptions &= ~FTS_NOSTAT;

        return palloc(option);
}

/*
 * -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 __unused, FTSENT *entry)
{
        return user_from_uid(entry->fts_statp->st_uid, 1) == NULL;
}

PLAN *
c_nouser(OPTION *option, char ***argvp __unused)
{
        ftsoptions &= ~FTS_NOSTAT;

        return palloc(option);
}

/*
 * -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,
            plan->flags & F_IGNCASE ? FNM_CASEFOLD : 0);
}

/* c_path is the same as c_name */

/*
 * -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 if (plan->flags & F_ANY)
                return (mode & plan->m_data);
        else
                return mode == plan->m_data;
        /* NOTREACHED */
}

PLAN *
c_perm(OPTION *option, char ***argvp)
{
        char *perm;
        PLAN *new;
        mode_t *set;

        perm = nextarg(option, argvp);
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(option);

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

        if ((set = setmode(perm)) == NULL)
                errx(1, "%s: %s: illegal mode string", option->name, 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 __unused, FTSENT *entry)
{
        (void)puts(entry->fts_path);
        return 1;
}

PLAN *
c_print(OPTION *option, char ***argvp __unused)
{
        isoutput = 1;

        return palloc(option);
}

/*
 * -print0 functions --
 *
 *      Always true, causes the current pathname to be written to
 *      standard output followed by a NUL character
 */
int
f_print0(PLAN *plan __unused, FTSENT *entry)
{
        fputs(entry->fts_path, stdout);
        fputc('\0', stdout);
        return 1;
}

/* c_print0 is the same as c_print */

/*
 * -printf functions --
 *
 *      Always true. Causes information as specified in the
 *      argument to be written to standard output.
 */
int
f_printf(PLAN *plan, FTSENT *entry)
{
        do_printf(plan, entry, stdout);
        return 1;
}

PLAN *
c_printf(OPTION *option, char ***argvp)
{
        PLAN *new;

        /*
         * XXX We could scan the format looking for stat-dependent formats, and
         * turn off the nostat bit for trival cases: `%p`/`%f`/`%h`.
         */
        isoutput = 1;
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(option);
        new->c_data = nextarg(option, argvp);

        return (new);
}

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

/* c_prune == c_simple */

/*
 * -regex functions --
 *
 *      True if the whole path of the file matches pattern using
 *      regular expression.
 */
int
f_regex(PLAN *plan, FTSENT *entry)
{
        char *str;
        int len;
        regex_t *pre;
        regmatch_t pmatch;
        int errcode;
        char errbuf[LINE_MAX];
        int matched;

        pre = plan->re_data;
        str = entry->fts_path;
        len = strlen(str);
        matched = 0;

        pmatch.rm_so = 0;
        pmatch.rm_eo = len;

        errcode = regexec(pre, str, 1, &pmatch, REG_STARTEND);

        if (errcode != 0 && errcode != REG_NOMATCH) {
                regerror(errcode, pre, errbuf, sizeof errbuf);
                errx(1, "%s: %s",
                     plan->flags & F_IGNCASE ? "-iregex" : "-regex", errbuf);
        }

        if (errcode == 0 && pmatch.rm_so == 0 && pmatch.rm_eo == len)
                matched = 1;

        return matched;
}

PLAN *
c_regex(OPTION *option, char ***argvp)
{
        PLAN *new;
        char *pattern;
        regex_t *pre;
        int errcode;
        char errbuf[LINE_MAX];

        if ((pre = malloc(sizeof(regex_t))) == NULL)
                err(1, NULL);

        pattern = nextarg(option, argvp);

        if ((errcode = regcomp(pre, pattern,
            regexp_flags | (option->flags & F_IGNCASE ? REG_ICASE : 0))) != 0) {
                regerror(errcode, pre, errbuf, sizeof errbuf);
                errx(1, "%s: %s: %s",
                     option->flags & F_IGNCASE ? "-iregex" : "-regex",
                     pattern, errbuf);
        }

        new = palloc(option);
        new->re_data = pre;

        return new;
}

/* c_simple covers c_prune, c_openparen, c_closeparen, c_not, c_or, c_true, c_false */

PLAN *
c_simple(OPTION *option, char ***argvp __unused)
{
        return palloc(option);
}

/*
 * -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
 *      one of c k M G T P, the size is in bytes, kilobytes,
 *      megabytes, gigabytes, terabytes or petabytes respectively.
 */
#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(OPTION *option, char ***argvp)
{
        char *size_str;
        PLAN *new;
        char endch;
        off_t scale;

        size_str = nextarg(option, argvp);
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(option);
        endch = 'c';
        new->o_data = find_parsenum(new, option->name, size_str, &endch);
        if (endch != '\0') {
                divsize = 0;

                switch (endch) {
                case 'c':                       /* characters */
                        scale = 0x1LL;
                        break;
                case 'k':                       /* kilobytes 1<<10 */
                        scale = 0x400LL;
                        break;
                case 'M':                       /* megabytes 1<<20 */
                        scale = 0x100000LL;
                        break;
                case 'G':                       /* gigabytes 1<<30 */
                        scale = 0x40000000LL;
                        break;
                case 'T':                       /* terabytes 1<<40 */
                        scale = 0x10000000000LL;
                        break;
                case 'P':                       /* petabytes 1<<50 */
                        scale = 0x4000000000000LL;
                        break;
                default:
                        errx(1, "%s: %s: illegal trailing character",
                                option->name, size_str);
                        break;
                }
                if (new->o_data > QUAD_MAX / scale)
                        errx(1, "%s: %s: value too large",
                                option->name, size_str);
                new->o_data *= scale;
        }
        return new;
}

/*
 * -sparse functions --
 *
 *      Check if a file is sparse by finding if it occupies fewer blocks
 *      than we expect based on its size.
 */
int
f_sparse(PLAN *plan __unused, FTSENT *entry)
{
        off_t expected_blocks;

        expected_blocks = (entry->fts_statp->st_size + 511) / 512;
        return entry->fts_statp->st_blocks < expected_blocks;
}

PLAN *
c_sparse(OPTION *option, char ***argvp __unused)
{
        ftsoptions &= ~FTS_NOSTAT;

        return palloc(option);
}

/*
 * -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)
{
        if (plan->m_data == S_IFDIR)
                return (entry->fts_info == FTS_D || entry->fts_info == FTS_DC ||
                    entry->fts_info == FTS_DNR || entry->fts_info == FTS_DOT ||
                    entry->fts_info == FTS_DP);
        else
                return (entry->fts_statp->st_mode & S_IFMT) == plan->m_data;
}

PLAN *
c_type(OPTION *option, char ***argvp)
{
        char *typestring;
        PLAN *new;
        mode_t  mask;

        typestring = nextarg(option, argvp);
        if (typestring[0] != 'd')
                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;
#if defined(FTS_WHITEOUT) && defined(S_IFWHT)
        case 'w':
                mask = S_IFWHT;
                ftsoptions |= FTS_WHITEOUT;
                break;
#endif /* FTS_WHITEOUT */
        default:
                errx(1, "%s: %s: unknown type", option->name, typestring);
        }

        new = palloc(option);
        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(OPTION *option, char ***argvp)
{
        char *username;
        PLAN *new;
        struct passwd *p;
        uid_t uid;

        username = nextarg(option, argvp);
        ftsoptions &= ~FTS_NOSTAT;

        new = palloc(option);
        p = getpwnam(username);
        if (p == NULL) {
                char* cp = username;
                if( username[0] == '-' || username[0] == '+' )
                        username++;
                uid = atoi(username);
                if (uid == 0 && username[0] != '0')
                        errx(1, "%s: %s: no such user", option->name, username);
                uid = find_parsenum(new, option->name, cp, NULL);
        } else
                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(OPTION *option, char ***argvp __unused)
{
        ftsoptions |= FTS_XDEV;

        return palloc(option);
}

/*
 * ( expression ) functions --
 *
 *      True if expression is true.
 */
int
f_expr(PLAN *plan, FTSENT *entry)
{
        PLAN *p;
        int state = 0;

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

/*
 * f_openparen and f_closeparen nodes are temporary place markers.  They are
 * eliminated during phase 2 of find_formplan() --- the '(' node is converted
 * to a f_expr node containing the expression and the ')' node is discarded.
 * The functions themselves are only used as constants.
 */

int
f_openparen(PLAN *plan __unused, FTSENT *entry __unused)
{
        abort();
}

int
f_closeparen(PLAN *plan __unused, FTSENT *entry __unused)
{
        abort();
}

/* c_openparen == c_simple */
/* c_closeparen == c_simple */

/*
 * AND operator. Since AND is implicit, no node is allocated.
 */
PLAN *
c_and(OPTION *option __unused, char ***argvp __unused)
{
        return NULL;
}

/*
 * ! expression functions --
 *
 *      Negation of a primary; the unary NOT operator.
 */
int
f_not(PLAN *plan, FTSENT *entry)
{
        PLAN *p;
        int state = 0;

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

/* c_not == c_simple */

/*
 * 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 = 0;

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

        if (state)
                return 1;

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

/* c_or == c_simple */

/*
 * -false
 *
 *      Always false.
 */
int
f_false(PLAN *plan __unused, FTSENT *entry __unused)
{
        return 0;
}

/* c_false == c_simple */

/*
 * -quit
 *
 *      Exits the program
 */
int
f_quit(PLAN *plan __unused, FTSENT *entry __unused)
{
        finish_execplus();
        exit(exitstatus);
}

/* c_quit == c_simple */

/*
 * -readable
 *
 *      File is readable
 */
int
f_readable(PLAN *plan __unused, FTSENT *entry)
{
        return (access(entry->fts_path, R_OK) == 0);
}

/* c_readable == c_simple */

/*
 * -writable
 *
 *      File is writable
 */
int
f_writable(PLAN *plan __unused, FTSENT *entry)
{
        return (access(entry->fts_path, W_OK) == 0);
}

/* c_writable == c_simple */

/*
 * -executable
 *
 *      File is executable
 */
int
f_executable(PLAN *plan __unused, FTSENT *entry)
{
        return (access(entry->fts_path, X_OK) == 0);
}

/* c_executable == c_simple */