/*
 * 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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 * Copyright 2023 RackTop Systems, Inc.
 */

#include <mdb/mdb_modapi.h>
#include <sys/types.h>
#include <sys/stream.h>
#include <sys/strlog.h>

int
msgbuf(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
{
        queue_t q;
        uintptr_t qp;
        mblk_t next;
        mblk_t cont;
        log_ctl_t lctl;
        char line[1024];
        uint_t verbose = FALSE;
        uint_t delta = FALSE;
        uint_t abstime = FALSE;

        if (!(flags & DCMD_ADDRSPEC)) {
                if (mdb_readsym(&qp, sizeof (qp), "log_recentq") == -1) {
                        mdb_warn("failed to read log_recent");
                        return (DCMD_ERR);
                }

                if (mdb_vread(&q, sizeof (q), qp) == -1) {
                        mdb_warn("failed to read queue_t at %p", qp);
                        return (DCMD_ERR);
                }

                if (mdb_pwalk_dcmd("b_next", "msgbuf", argc, argv,
                    (uintptr_t)q.q_first) == -1) {
                        mdb_warn("can't walk 'b_next'");
                        return (DCMD_ERR);
                }
                return (DCMD_OK);
        }

        if (mdb_getopts(argc, argv,
            't', MDB_OPT_SETBITS, TRUE, &delta,
            'T', MDB_OPT_SETBITS, TRUE, &abstime,
            'v', MDB_OPT_SETBITS, TRUE, &verbose, NULL) != argc)
                return (DCMD_USAGE);

        /* For backwards compatability, -v implies -T */
        if (verbose)
                abstime = TRUE;

        if (DCMD_HDRSPEC(flags)) {
                int amt = 80;

                mdb_printf("%<u>");
                if (abstime) {
                        mdb_printf("%-20s ", "TIMESTAMP");
                        amt -= 21;
                }
                if (delta) {
                        mdb_printf("%-20s ", "DELTA");
                        amt -= 21;
                }
                if (verbose) {
                        mdb_printf("%?s ", "LOGCTL");
                        amt -= 17;
                }
                mdb_printf("%-*s%</u>\n", amt, "MESSAGE");
        }

        if (mdb_vread(&next, sizeof (next), addr) == -1) {
                mdb_warn("failed to read msgb structure at %p", addr);
                return (DCMD_ERR);
        }

        if (mdb_vread(&lctl, sizeof (lctl), (uintptr_t)next.b_rptr) == -1) {
                mdb_warn("failed to read log_ctl_t at %p", next.b_rptr);
                return (DCMD_ERR);
        }

        if (mdb_vread(&cont, sizeof (cont), (uintptr_t)next.b_cont) == -1) {
                mdb_warn("failed to read msgb structure at %p", next.b_cont);
                return (DCMD_ERR);
        }

        if (mdb_readstr(line, sizeof (line), (uintptr_t)cont.b_rptr) == -1) {
                mdb_warn("failed to read string at %p", cont.b_rptr);
                return (DCMD_ERR);
        }

        if (abstime)
                mdb_printf("%Y ", lctl.ttime);

        if (delta) {
                timestruc_t     hr_time;
                int64_t         diff;
                char            buf[32] = { 0 };

                if (mdb_readvar(&hr_time, "panic_hrestime") == -1) {
                        mdb_warn("failed to read panic_hrestime");
                        return (DCMD_ERR);
                }

                if (hr_time.tv_sec == 0 &&
                    mdb_readvar(&hr_time, "hrestime") == -1) {
                        mdb_warn("failed to read hrestime");
                        return (DCMD_ERR);
                }

                diff = (int64_t)lctl.ttime - hr_time.tv_sec;
                mdb_nicetime(SEC2NSEC(diff), buf, sizeof (buf));
                mdb_printf("%-20s ", buf);
        }

        if (verbose)
                mdb_printf("%?p ", next.b_rptr);

        /* skip leading CR to avoid extra lines */
        if (line[0] == 0x0d)
                mdb_printf("%s", &line[1]);
        else
                mdb_printf("%s", &line[0]);

        return (DCMD_OK);
}

void
msgbuf_help(void)
{
        mdb_printf("Print the most recent console messages.\n\n"
            "%<b>OPTIONS%</b>\n"
            "\t-t\tInclude the age of the message from now.\n"
            "\t-T\tInclude the date/time of the message.\n"
            "\t-v\tInclude the date/time of the message as well as the address "
            "of its log_ctl_t.\n");
}