/*      $OpenBSD: rcsmerge.c,v 1.57 2016/08/26 09:02:54 guenther Exp $  */
/*
 * Copyright (c) 2005, 2006 Xavier Santolaria <xsa@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 <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

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

int
rcsmerge_main(int argc, char **argv)
{
        int fd, ch, flags, kflag, status;
        char fpath[PATH_MAX], r1[RCS_REV_BUFSZ], r2[RCS_REV_BUFSZ];
        char *rev_str1, *rev_str2;
        RCSFILE *file;
        RCSNUM *rev1, *rev2;
        BUF *bp;

        flags = 0;
        status = D_ERROR;
        rev1 = rev2 = NULL;
        rev_str1 = rev_str2 = NULL;

        while ((ch = rcs_getopt(argc, argv, "AEek:p::q::r::TVx::z:")) != -1) {
                switch (ch) {
                case 'A':
                        /*
                         * kept for compatibility
                         */
                        break;
                case 'E':
                        flags |= MERGE_EFLAG;
                        flags |= MERGE_OFLAG;
                        break;
                case 'e':
                        flags |= MERGE_EFLAG;
                        break;
                case 'k':
                        kflag = rcs_kflag_get(rcs_optarg);
                        if (RCS_KWEXP_INVAL(kflag)) {
                                warnx("invalid RCS keyword substitution mode");
                                (usage)();
                        }
                        break;
                case 'p':
                        rcs_setrevstr2(&rev_str1, &rev_str2, rcs_optarg);
                        flags |= PIPEOUT;
                        break;
                case 'q':
                        rcs_setrevstr2(&rev_str1, &rev_str2, rcs_optarg);
                        flags |= QUIET;
                        break;
                case 'r':
                        rcs_setrevstr2(&rev_str1, &rev_str2,
                            rcs_optarg ? rcs_optarg : "");
                        break;
                case 'T':
                        /*
                         * kept for compatibility
                         */
                        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;
                case 'z':
                        timezone_flag = rcs_optarg;
                        break;
                default:
                        (usage)();
                }
        }

        argc -= rcs_optind;
        argv += rcs_optind;

        if (rev_str1 == NULL) {
                warnx("no base revision number given");
                (usage)();
        }

        if (argc < 1) {
                warnx("no input file");
                (usage)();
        }

        if (argc > 2 || (argc == 2 && argv[1] != NULL))
                warnx("warning: excess arguments ignored");

        if ((fd = rcs_choosefile(argv[0], fpath, sizeof(fpath))) < 0)
                err(status, "%s", fpath);

        if (!(flags & QUIET))
                (void)fprintf(stderr, "RCS file: %s\n", fpath);

        if ((file = rcs_open(fpath, fd, RCS_READ)) == NULL)
                return (status);

        if (strcmp(rev_str1, "") == 0) {
                rev1 = rcsnum_alloc();
                rcsnum_cpy(file->rf_head, rev1, 0);
        } else if ((rev1 = rcs_getrevnum(rev_str1, file)) == NULL)
                errx(D_ERROR, "invalid revision: %s", rev_str1);

        if (rev_str2 != NULL && strcmp(rev_str2, "") != 0) {
                if ((rev2 = rcs_getrevnum(rev_str2, file)) == NULL)
                        errx(D_ERROR, "invalid revision: %s", rev_str2);
        } else {
                rev2 = rcsnum_alloc();
                rcsnum_cpy(file->rf_head, rev2, 0);
        }

        if (rcsnum_cmp(rev1, rev2, 0) == 0)
                goto out;

        if ((bp = rcs_diff3(file, argv[0], rev1, rev2, flags)) == NULL)
                errx(D_ERROR, "failed to merge");

        if (!(flags & QUIET)) {
                (void)rcsnum_tostr(rev1, r1, sizeof(r1));
                (void)rcsnum_tostr(rev2, r2, sizeof(r2));

                (void)fprintf(stderr, "Merging differences between %s and "
                    "%s into %s%s\n", r1, r2, argv[0],
                    (flags & PIPEOUT) ? "; result to stdout":"");
        }

        if (diff3_conflicts != 0)
                status = D_OVERLAPS;
        else
                status = 0;

        if (flags & PIPEOUT)
                buf_write_fd(bp, STDOUT_FILENO);
        else {
                /* XXX mode */
                if (buf_write(bp, argv[0], 0644) < 0)
                        warnx("buf_write failed");

        }

        buf_free(bp);

out:
        rcs_close(file);
        rcsnum_free(rev1);
        rcsnum_free(rev2);
        return (status);
}

__dead void
rcsmerge_usage(void)
{
        fprintf(stderr,
            "usage: rcsmerge [-EV] [-kmode] [-p[rev]] [-q[rev]]\n"
            "                [-xsuffixes] [-ztz] -rrev file ...\n");

        exit(D_ERROR);
}