/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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) 2010, Oracle and/or its affiliates. All rights reserved.
 */

/*
 * Copyright 2019 Joyent, Inc.
 */

#include <sys/types.h>

#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <alloca.h>
#include <stdio.h>
#include <unistd.h>
#include <dlfcn.h>
#include <thread.h>
#include <pthread.h>
#include <ctype.h>

#include <scsi/libsmp.h>
#include <scsi/libsmp_plugin.h>
#include "smp_impl.h"

__thread smp_errno_t _smp_errno;
__thread char _smp_errmsg[LIBSMP_ERRMSGLEN];

int
smp_assert(const char *expr, const char *file, int line)
{
        char *msg;
        size_t len;

        len = snprintf(NULL, 0,
            "ABORT: \"%s\", line %d: assertion failed: %s\n", file, line, expr);

        msg = alloca(len + 1);

        (void) snprintf(msg, len + 1,
            "ABORT: \"%s\", line %d: assertion failed: %s\n", file, line, expr);

        (void) write(STDERR_FILENO, msg, strlen(msg));

        abort();
        /*NOTREACHED*/
}

int
smp_set_errno(smp_errno_t err)
{
        _smp_errno = err;
        _smp_errmsg[0] = '\0';

        return (-1);
}

/*
 * Internal routine for setting both _smp_errno and _smp_errmsg.  We save
 * and restore the UNIX errno across this routing so the caller can use either
 * smp_set_errno(), smp_error(), or smp_verror() without this value changing.
 */
int
smp_verror(smp_errno_t err, const char *fmt, va_list ap)
{
        size_t n;
        char *errmsg;

        /*
         * To allow the existing error message to itself be used in an error
         * message, we put the new error message into a buffer on the stack,
         * and then copy it into lsh_errmsg.  We also need to set the errno,
         * but because the call to smp_set_errno() is destructive to
         * lsh_errmsg, we do this after we print into our temporary buffer
         * (in case _smp_errmsg is part of the error message) and before we
         * copy the temporary buffer on to _smp_errmsg (to prevent our new
         * message from being nuked by the call to smp_set_errno()).
         */
        errmsg = alloca(sizeof (_smp_errmsg));
        (void) vsnprintf(errmsg, sizeof (_smp_errmsg), fmt, ap);
        (void) smp_set_errno(err);

        n = strlen(errmsg);

        if (n != 0 && errmsg[n - 1] == '\n')
                errmsg[n - 1] = '\0';

        bcopy(errmsg, _smp_errmsg, n + 1);

        return (-1);
}

int
smp_error(smp_errno_t err, const char *fmt, ...)
{
        va_list ap;

        if (fmt == NULL)
                return (smp_set_errno(err));

        va_start(ap, fmt);
        err = smp_verror(err, fmt, ap);
        va_end(ap);

        return (err);
}

smp_errno_t
smp_errno(void)
{
        return (_smp_errno);
}

const char *
smp_errmsg(void)
{
        if (_smp_errmsg[0] == '\0')
                (void) strlcpy(_smp_errmsg, smp_strerror(_smp_errno),
                    sizeof (_smp_errmsg));

        return (_smp_errmsg);
}

/*ARGSUSED*/
void *
smp_alloc(size_t size)
{
        void *mem;

        if (size == 0) {
                (void) smp_set_errno(ESMP_ZERO_LENGTH);
                return (NULL);
        }

        if ((mem = malloc(size)) == NULL)
                (void) smp_set_errno(ESMP_NOMEM);

        return (mem);
}

void *
smp_zalloc(size_t size)
{
        void *mem;

        if ((mem = smp_alloc(size)) == NULL)
                return (NULL);

        bzero(mem, size);

        return (mem);
}

char *
smp_strdup(const char *str)
{
        size_t len = strlen(str);
        char *dup = smp_alloc(len + 1);

        if (dup == NULL)
                return (NULL);

        return (strcpy(dup, str));
}

void
smp_free(void *ptr)
{
        free(ptr);
}

/*
 * Trim any leading and/or trailing spaces from the fixed-length string
 * argument and return a newly-allocated copy of it.
 */
char *
smp_trim_strdup(const char *str, size_t len)
{
        const char *p;
        char *r;

        for (p = str; p - str < len && isspace(*p); p++)
                ;

        len -= (p - str);

        if (len == 0)
                return (NULL);

        for (str = p + len - 1; str > p && isspace(*str); str--, len--)
                ;

        if (len == 0)
                return (NULL);

        r = smp_alloc(len + 1);
        if (r == NULL)
                return (NULL);

        bcopy(p, r, len);
        r[len] = '\0';

        return (r);
}

int
smp_init(int version)
{
        if (version != LIBSMP_VERSION)
                return (smp_error(ESMP_VERSION,
                    "library version %d does not match requested version %d",
                    LIBSMP_VERSION, version));

        smp_engine_init();

        return (0);
}

void
smp_fini(void)
{
        smp_engine_fini();
}