/*      $OpenBSD: rcsclean.c,v 1.57 2023/08/11 05:02:21 guenther Exp $  */
/*
 * Copyright (c) 2005 Joris Vink <joris@openbsd.org>
 * All rights reserved.
 *
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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/types.h>
#include <sys/stat.h>

#include <dirent.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

#include "rcsprog.h"
#include "diff.h"

static void     rcsclean_file(char *, const char *);

static int nflag = 0;
static int kflag = RCS_KWEXP_ERR;
static int uflag = 0;
static int flags = 0;
static char *locker = NULL;

int
rcsclean_main(int argc, char **argv)
{
        int i, ch;
        char *rev_str;
        DIR *dirp;
        struct dirent *dp;

        rev_str = NULL;

        while ((ch = rcs_getopt(argc, argv, "k:n::q::r::Tu::Vx::")) != -1) {
                switch (ch) {
                case 'k':
                        kflag = rcs_kflag_get(rcs_optarg);
                        if (RCS_KWEXP_INVAL(kflag)) {
                                warnx("invalid RCS keyword substitution mode");
                                (usage)();
                        }
                        break;
                case 'n':
                        rcs_setrevstr(&rev_str, rcs_optarg);
                        nflag = 1;
                        break;
                case 'q':
                        rcs_setrevstr(&rev_str, rcs_optarg);
                        flags |= QUIET;
                        break;
                case 'r':
                        rcs_setrevstr(&rev_str, rcs_optarg);
                        break;
                case 'T':
                        flags |= PRESERVETIME;
                        break;
                case 'u':
                        rcs_setrevstr(&rev_str, rcs_optarg);
                        uflag = 1;
                        break;
                case 'V':
                        printf("%s\n", rcs_version);
                        exit(0);
                case 'x':
                        /* Use blank extension if none given. */
                        rcs_suffixes = rcs_optarg ? rcs_optarg : "";
                        break;
                default:
                        (usage)();
                }
        }

        argc -= rcs_optind;
        argv += rcs_optind;

        if ((locker = getlogin()) == NULL)
                err(1, "getlogin");

        if (argc == 0) {
                if ((dirp = opendir(".")) == NULL) {
                        warn("opendir");
                        (usage)();
                }

                while ((dp = readdir(dirp)) != NULL) {
                        if (dp->d_type == DT_DIR)
                                continue;
                        rcsclean_file(dp->d_name, rev_str);
                }

                (void)closedir(dirp);
        } else
                for (i = 0; i < argc; i++)
                        rcsclean_file(argv[i], rev_str);

        return (0);
}

__dead void
rcsclean_usage(void)
{
        fprintf(stderr,
            "usage: rcsclean [-TV] [-kmode] [-n[rev]] [-q[rev]] [-r[rev]]\n"
            "                [-u[rev]] [-xsuffixes] [-ztz] [file ...]\n");

        exit(1);
}

static void
rcsclean_file(char *fname, const char *rev_str)
{
        int fd, match;
        RCSFILE *file;
        char fpath[PATH_MAX], numb[RCS_REV_BUFSZ];
        RCSNUM *rev;
        BUF *b1, *b2;
        struct timespec rcs_mtime = { .tv_sec = 0, .tv_nsec = UTIME_OMIT };

        b1 = b2 = NULL;
        file = NULL;
        rev = NULL;

        if ((fd = rcs_choosefile(fname, fpath, sizeof(fpath))) < 0)
                goto out;

        if ((file = rcs_open(fpath, fd, RCS_RDWR)) == NULL)
                goto out;

        if (flags & PRESERVETIME)
                rcs_mtime = rcs_get_mtime(file);

        rcs_kwexp_set(file, kflag);

        if (rev_str == NULL)
                rev = file->rf_head;
        else if ((rev = rcs_getrevnum(rev_str, file)) == NULL) {
                warnx("%s: Symbolic name `%s' is undefined.", fpath, rev_str);
                goto out;
        }

        if ((b1 = rcs_getrev(file, rev)) == NULL) {
                warnx("failed to get needed revision");
                goto out;
        }
        if ((b2 = buf_load(fname)) == NULL) {
                warnx("failed to load `%s'", fname);
                goto out;
        }

        /* If buffer lengths are the same, compare contents as well. */
        if (buf_len(b1) != buf_len(b2))
                match = 0;
        else {
                size_t len, n;

                len = buf_len(b1);

                match = 1;
                for (n = 0; n < len; ++n)
                        if (buf_getc(b1, n) != buf_getc(b2, n)) {
                                match = 0;
                                break;
                        }
        }

        if (match == 1) {
                if (uflag == 1 && !TAILQ_EMPTY(&(file->rf_locks))) {
                        if (!(flags & QUIET) && nflag == 0) {
                                printf("rcs -u%s %s\n",
                                    rcsnum_tostr(rev, numb, sizeof(numb)),
                                    fpath);
                        }
                        (void)rcs_lock_remove(file, locker, rev);
                }

                if (TAILQ_EMPTY(&(file->rf_locks))) {
                        if (!(flags & QUIET))
                                printf("rm -f %s\n", fname);

                        if (nflag == 0)
                                (void)unlink(fname);
                }
        }

        rcs_write(file);
        if (flags & PRESERVETIME)
                rcs_set_mtime(file, rcs_mtime);

out:
        buf_free(b1);
        buf_free(b2);
        if (file != NULL)
                rcs_close(file);
}