/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */

#include "uucp.h"

/*
 * get next conversation sequence number
 *      rmtname -> name of remote system
 * returns:
 *      0       -> no entery
 *      1       -> 0 sequence number
 */
int
gnxseq(char *rmtname)
{
        register FILE *fp0, *fp1;
        register struct tm *tp;
        int count = 0, ct, ret;
        char buf[BUFSIZ], name[NAMESIZE];
        time_t clock;

        if (access(SQFILE, 0) != 0)
                return (0);

        {
                int i;
                for (i = 0; i < 5; i++)
                        if ((ret = mklock(SQLOCK)) == SUCCESS)
                                break;
                sleep(5);
        }
        if (ret != SUCCESS) {
                logent("CAN'T LOCK", SQLOCK);
                DEBUG(4, "can't lock %s\n", SQLOCK);
                return (0);
        }
        if ((fp0 = fopen(SQFILE, "r")) == NULL)
                return (0);
        if ((fp1 = fopen(SQTMP, "w")) == NULL) {
                fclose(fp0);
                return (0);
        }
        chmod(SQTMP, DFILEMODE);

        while (fgets(buf, BUFSIZ, fp0) != NULL) {
                ret = sscanf(buf, "%s%d", name, &ct);
                if (ret < 2)
                        ct = 0;
                name[7] = '\0';
                if (ct > 9998)
                        ct = 0;
                if (strncmp(rmtname, name, SYSNSIZE) != SAME) {
                        fputs(buf, fp1);
                        continue;
                }

                /*
                 * found name
                 */
                count = ++ct;
                time(&clock);
                tp = localtime(&clock);
                fprintf(fp1, "%s %d %d/%d-%d:%2.2d\n", name, ct,
                    tp->tm_mon + 1, tp->tm_mday, tp->tm_hour,
                    tp->tm_min);

                /*
                 * write should be checked
                 */
                while (fgets(buf, BUFSIZ, fp0) != NULL)
                        fputs(buf, fp1);
        }
        fclose(fp0);
        fclose(fp1);
        if (count == 0) {
                rmlock(SQLOCK);
                unlink(SQTMP);
        }
        return (count);
}

/*
 * commit sequence update
 * returns:
 *      0       -> ok
 *      other   -> link failed
 */
int
cmtseq(void)
{
        int ret;

        if ((ret = access(SQTMP, 0)) != 0) {
                rmlock(SQLOCK);
                return (0);
        }
        unlink(SQFILE);
        ret = link(SQTMP, SQFILE);
        unlink(SQTMP);
        rmlock(SQLOCK);
        return (ret);
}

/*
 * unlock sequence file
 */
void
ulkseq(void)
{
        unlink(SQTMP);
        rmlock(SQLOCK);
}