[apple/shell_cmds.git] / find / function.c

/*-
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
#if 0
static const char sccsid[] = "@(#)function.c  8.10 (Berkeley) 5/4/95";
#else
static const char rcsid[] =
  "$FreeBSD: src/usr.bin/find/function.c,v 1.22.2.9 2001/09/19 09:44:24 ru Exp $";
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/ucred.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/mount.h>
#include <sys/timeb.h>
#include <sys/types.h>
#include <sys/sysctl.h>

#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fnmatch.h>
#include <fts.h>
#include <grp.h>
#include <pwd.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "find.h"

#ifdef __APPLE__
#include "get_compat.h"
#else
#define COMPAT_MODE(func, mode) 1
#endif

time_t get_date __P((char *date, struct timeb *now));

#define COMPARE(a, b) {                                                 \
        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();                                                \
        }                                                               \
}

static PLAN *
palloc(option)
        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, option, vp, endch)
        PLAN *plan;
        char *option, *vp, *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 || endchar[0] != *endch))
                errx(1, "%s: %s: illegal trailing character", option, vp);
        if (endch)
                *endch = endchar[0];
        return value;
}

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

        if ((arg = **argvp) == 0)
                errx(1, "%s: requires additional arguments", option->name);
        (*argvp)++;
        return arg;
} /* nextarg() */

/*
 * 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) \
        if (((p)->flags & F_ELG_MASK) == F_LESSTHAN) \
                ++((p)->t_data);

/*
 * -[acm]min n functions --
 *
 *    True if the difference between the
 *              file access time (-amin)
 *              last change of file status information (-cmin)
 *              file modification time (-mmin)
 *    and the current time is n min periods.
 */
int
f_Xmin(plan, entry)
        PLAN *plan;
        FTSENT *entry;
{
        extern time_t now;

        if (plan->flags & F_TIME_C) {
                COMPARE((now - entry->fts_statp->st_ctime +
                    60 - 1) / 60, plan->t_data);
        } else if (plan->flags & F_TIME_A) {
                COMPARE((now - entry->fts_statp->st_atime +
                    60 - 1) / 60, plan->t_data);
        } else {
                COMPARE((now - entry->fts_statp->st_mtime +
                    60 - 1) / 60, plan->t_data);
        }
}

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

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

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

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

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

        int fudge = COMPAT_MODE("bin/find", "unix2003") ? 0 : 86400 - 1;

        if (plan->flags & F_TIME_C) {
                COMPARE((now - entry->fts_statp->st_ctime +
                    fudge) / 86400, plan->t_data);
        } else if (plan->flags & F_TIME_A) {
                COMPARE((now - entry->fts_statp->st_atime +
                    fudge) / 86400, plan->t_data);
        } else {
                COMPARE((now - entry->fts_statp->st_mtime +
                    fudge) / 86400, plan->t_data);
        }
}

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

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

        new = palloc(option);
        new->t_data = find_parsenum(new, option->name, ndays, NULL);
        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, argvp)
        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;
}

/*
 * -delete functions --
 *
 *      True always.  Makes its best shot and continues on regardless.
 */
int
f_delete(plan, entry)
        PLAN *plan;
        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 (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(option, argvp)
        OPTION *option;
        char ***argvp;
{

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

        return palloc(option);
}


/*
 * -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, entry)
        PLAN *plan;
        FTSENT *entry;
{
        return 1;
}

PLAN *
c_depth(option, argvp)
        OPTION *option;
        char ***argvp;
{
        isdepth = 1;

        return palloc(option);
}

/*
 * -empty functions --
 *
 *      True if the file or directory is empty
 */
int
f_empty(plan, entry)
        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)
                        err(1, "%s", entry->fts_accpath);
                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, argvp)
        OPTION *option;
        char ***argvp;
{
        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, entry)
        register PLAN *plan;
        FTSENT *entry;
{
        extern int dotfd;
        register int cnt;
        pid_t pid;
        int status;
        char *file = NULL;
        static char **plus_path = NULL;
        static int plus_path_cnt = 0;
        static unsigned long exec_after = 0;
        static unsigned long path_so_far = 0;
        struct _ex saved_ex;

        if (entry) {
            /* 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_CLEANUP) {
                plus_path = realloc(plus_path, sizeof(char *) * ++plus_path_cnt);
                if (!plus_path) errx(1, "out of memory");
                plus_path[plus_path_cnt -1] = strdup(file);
                if (!plus_path[plus_path_cnt -1]) errx(1, "out of memory");

                path_so_far += sizeof(char *) + strlen(file);

                if (!exec_after) {
                    size_t l = sizeof(exec_after);
                    int rc = 
                      sysctlbyname("kern.argmax", &exec_after, &l, NULL, NULL);
                    if (rc < 0) {
                        /* Something conservitave */
                        exec_after = 16 * 1024;
                    }
                }
                if (path_so_far >= exec_after) {
                    return f_exec(plan, NULL);
                }

                return 1;
            }
        } else {
            if (!plus_path) return 1;
            saved_ex = plan->p_un.ex;
            int new_len = 0;
            int ocnt;
            for(cnt = 0; plan->e_argv[cnt]; ++cnt) {
                if (plan->e_len[cnt]) {
                    new_len += plus_path_cnt;
                } else {
                    new_len++;
                }
            }
            new_len++;

            plan->e_argv = malloc(sizeof(char *) * new_len);
            if (!plan->e_argv) errx(1, "out of memory");

            for(ocnt = cnt = 0; saved_ex._e_argv[ocnt]; ++ocnt) {
                if (saved_ex._e_len[ocnt]) {
                    int ppi;
                    for(ppi = 0; ppi < plus_path_cnt; ++ppi) {
                        plan->e_argv[cnt++] = plus_path[ppi];
                    }
#if 0
                    memmove(plan->e_argv + cnt, *plus_path,
                      sizeof(char *) * plus_path_cnt);
                    cnt += plus_path_cnt;
#endif
                } else {
                    plan->e_argv[cnt++] = saved_ex._e_argv[ocnt];
                }
            }
            plan->e_argv[cnt++] = NULL;
        }

        if (!(plan->flags & F_CLEANUP)) 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]);

        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) && 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);
        if (plus_path) {
            int i;
            for(i = 0; i < plus_path_cnt; ++i) {
                free(plus_path[i]);
            }
            free(plus_path);
            plus_path = NULL;
            plus_path_cnt = 0;
            plan->p_un.ex = saved_ex;
            path_so_far = 0;
            if (WIFEXITED(status) && WEXITSTATUS(status)) {
                exit(WEXITSTATUS(status));
            }
        }
        return (pid != -1 && WIFEXITED(status) && !WEXITSTATUS(status));
}

/*
 * 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, argvp)
        OPTION *option;
        char ***argvp;
{
        PLAN *new;                      /* node returned */
        register int cnt;
        register char **argv, **ap, *p;
        int plus_armed = 0;

        /* 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 \";\"", option->name);
                if (**ap == '{' && ap[0][1] == '}' && ap[0][2] == '\0') {
                    plus_armed = COMPAT_MODE("bin/find", "unix2003");
                    continue;
                }
                if (**ap == ';') {
                        break;
                }
                if (plus_armed && **ap == '+') {
                        new->flags |= F_CLEANUP;
                        break;
                }
                plus_armed = 0;
        }

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

        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((u_int)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;
}

int
f_flags(plan, entry)
        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, argvp)
        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;
}

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

        return palloc(option);
}

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

        /* 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 (statfs(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_flags = sb.f_flags;
                val_type = sb.f_type;
        }
        switch (plan->flags & F_MTMASK) {
        case F_MTFLAG:
                return (val_flags & plan->mt_data) != 0;
        case F_MTTYPE:
                return (val_type == plan->mt_data);
        default:
                abort();
        }
}

#if !defined(__NetBSD__)
PLAN *
c_fstype(option, argvp)
        OPTION *option;
        char ***argvp;
{
        char *fsname;
        register PLAN *new;
        struct vfsconf vfc;

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

        new = palloc(option);

        /*
         * Check first for a filesystem name.
         */
        if (getvfsbyname(fsname, &vfc) == 0) {
                new->flags |= F_MTTYPE;
                new->mt_data = vfc.vfc_typenum;
                return new;
        }

        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;
        }

        errx(1, "%s: unknown file type", fsname);
        /* NOTREACHED */
}
#endif /* __NetBSD__ */

/*
 * -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, entry)
        PLAN *plan;
        FTSENT *entry;
{
        return entry->fts_statp->st_gid == plan->g_data;
}

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

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

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

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

/*
 * -inum n functions --
 *
 *      True if the file has inode # n.
 */
int
f_inum(plan, entry)
        PLAN *plan;
        FTSENT *entry;
{
        COMPARE(entry->fts_statp->st_ino, plan->i_data);
}

PLAN *
c_inum(option, argvp)
        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;
}

/*
 * -links n functions --
 *
 *      True if the file has n links.
 */
int
f_links(plan, entry)
        PLAN *plan;
        FTSENT *entry;
{
        COMPARE(entry->fts_statp->st_nlink, plan->l_data);
}

PLAN *
c_links(option, argvp)
        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, entry)
        PLAN *plan;
        FTSENT *entry;
{
        printlong(entry->fts_path, entry->fts_accpath, entry->fts_statp);
        return 1;
}

PLAN *
c_ls(option, argvp)
        OPTION *option;
        char ***argvp;
{
        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, entry)
        PLAN *plan;
        FTSENT *entry;
{
        return !fnmatch(plan->c_data, entry->fts_name,
            plan->flags & F_IGNCASE ? FNM_CASEFOLD : 0);
}

PLAN *
c_name(option, argvp)
        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, entry)
        PLAN *plan;
        FTSENT *entry;
{
        if (plan->flags & F_TIME_C)
                return entry->fts_statp->st_ctime > plan->t_data;
        else if (plan->flags & F_TIME_A)
                return entry->fts_statp->st_atime > plan->t_data;
        else
                return entry->fts_statp->st_mtime > plan->t_data;
}

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

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

        new = palloc(option);
        /* compare against what */
        if (option->flags & F_TIME2_T) {
                new->t_data = get_date(fn_or_tspec, (struct timeb *) 0);
                if (new->t_data == (time_t) -1)
                        errx(1, "Can't parse date/time: %s", fn_or_tspec);
        } else {
                if (stat(fn_or_tspec, &sb))
                        err(1, "%s", fn_or_tspec);
                if (option->flags & F_TIME2_C)
                        new->t_data = sb.st_ctime;
                else if (option->flags & F_TIME2_A)
                        new->t_data = sb.st_atime;
                else
                        new->t_data = sb.st_mtime;
        }
        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, entry)
        PLAN *plan;
        FTSENT *entry;
{
        return group_from_gid(entry->fts_statp->st_gid, 1) == NULL;
}

PLAN *
c_nogroup(option, argvp)
        OPTION *option;
        char ***argvp;
{
        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, entry)
        PLAN *plan;
        FTSENT *entry;
{
        return user_from_uid(entry->fts_statp->st_uid, 1) == NULL;
}

PLAN *
c_nouser(option, argvp)
        OPTION *option;
        char ***argvp;
{
        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, entry)
        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, entry)
        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, argvp)
        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 == '+') {
                if ((set = setmode(perm +1)) != NULL) {
                    new->flags |= F_ANY;
                    ++perm;
                    free(set);
                }
        }

        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 pathame to be written to
 *      standard output.
 */
int
f_print(plan, entry)
        PLAN *plan;
        FTSENT *entry;
{
        (void)puts(entry->fts_path);
        return 1;
}

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

        return palloc(option);
}

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

/* c_print0 is the same as c_print */

/*
 * -prune functions --
 *
 *      Prune a portion of the hierarchy.
 */
int
f_prune(plan, entry)
        PLAN *plan;
        FTSENT *entry;
{
        extern FTS *tree;

        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, entry)
        PLAN *plan;
        FTSENT *entry;
{
        char *str;
        size_t 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, argvp)
        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 */

PLAN *
c_simple(option, argvp)
        OPTION *option;
        char ***argvp;
{
        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
 *      a c, the size is in bytes.
 */
#define FIND_SIZE       512
static int divsize = 1;

int
f_size(plan, entry)
        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, argvp)
        OPTION *option;
        char ***argvp;
{
        char *size_str;
        PLAN *new;
        char endch;

        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 == '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, entry)
        PLAN *plan;
        FTSENT *entry;
{
        return (entry->fts_statp->st_mode & S_IFMT) == plan->m_data;
}

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

        typestring = nextarg(option, 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 FTS_WHITEOUT
        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, entry)
        PLAN *plan;
        FTSENT *entry;
{
        return entry->fts_statp->st_uid == plan->u_data;
}

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

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

        p = getpwnam(username);
        if (p == NULL) {
                uid = atoi(username);
                if (uid == 0 && username[0] != '0')
                        errx(1, "%s: %s: no such user", option->name, username);
        } else
                uid = p->pw_uid;

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

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

        return palloc(option);
}

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

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

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

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

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