/*      $OpenBSD: merge.c,v 1.10 2016/08/26 09:02:54 guenther Exp $     */
/*
 * Copyright (c) 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 <time.h>
#include <unistd.h>

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

int
merge_main(int argc, char **argv)
{
        int ch, flags, labels, status;
        const char *label[3];
        BUF *bp;

        flags = labels = 0;

        /*
         * Using getopt(3) and not rcs_getopt() because merge(1)
         * allows spaces between options and their arguments.
         * Thus staying compatible with former implementation.
         */
        while ((ch = getopt(argc, argv, "AEeL:pqV")) != -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 'L':
                        if (3 <= labels)
                                errx(D_ERROR, "too many -L options");
                        label[labels++] = optarg;
                        break;
                case 'p':
                        flags |= PIPEOUT;
                        break;
                case 'q':
                        flags |= QUIET;
                        break;
                case 'V':
                        printf("%s\n", rcs_version);
                        exit(0);
                default:
                        (usage)();
                }
        }
        argc -= optind;
        argv += optind;

        if (argc != 3) {
                warnx("%s arguments", (argc < 3) ? "not enough" : "too many");
                (usage)();
        }

        for (; labels < 3; labels++)
                label[labels] = argv[labels];

        /* XXX handle labels */
        if ((bp = merge_diff3(argv, flags)) == NULL)
                errx(D_ERROR, "failed to merge");

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

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

        return (status);
}

__dead void
merge_usage(void)
{
        (void)fprintf(stderr,
            "usage: merge [-EepqV] [-L label] file1 file2 file3\n");

        exit(D_ERROR);
}