/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */

/*
 * Copyright 2021 Tintri by DDN, Inc. All rights reserved.
 */

#include <stdio.h>
#include <strings.h>
#include <sys/cmn_err.h>
#include <sys/varargs.h>

#include "utils.h"

void
hexdump(const uchar_t *buf, int len)
{
        int idx;
        char ascii[24];
        char *pa = ascii;

        bzero(ascii, sizeof (ascii));

        idx = 0;
        while (len--) {
                if ((idx & 15) == 0) {
                        printf("%04X: ", idx);
                        pa = ascii;
                }
                if (*buf > ' ' && *buf <= '~')
                        *pa++ = *buf;
                else
                        *pa++ = '.';
                printf("%02x ", *buf++);

                idx++;
                if ((idx & 3) == 0) {
                        *pa++ = ' ';
                        (void) putchar(' ');
                }
                if ((idx & 15) == 0) {
                        *pa = '\0';
                        printf("%s\n", ascii);
                }
        }

        if ((idx & 15) != 0) {
                *pa = '\0';
                /* column align the last ascii row */
                while ((idx & 15) != 0) {
                        if ((idx & 3) == 0)
                                (void) putchar(' ');
                        printf("   ");
                        idx++;
                }
                printf("%s\n", ascii);
        }
}

/*
 * Provide a real function (one that prints something) to replace
 * the stub in libfakekernel.  This prints cmn_err() messages.
 */
void
fakekernel_putlog(char *msg, size_t len, int flags)
{

        (void) fwrite(msg, 1, len, stdout);
        (void) fflush(stdout);
}

/*
 * Build a UIO for the input or output buffer
 * Arbitrarily splits into 2 segs for testing uio.
 */
void
make_uio(void *buf, size_t buflen, uio_t *uio, iovec_t *iov, int iovmax)
{
        size_t maxseg = 512;
        size_t tlen;
        int i;

        bzero(uio, sizeof (*uio));
        uio->uio_resid = buflen;
        uio->uio_segflg = UIO_SYSSPACE;

        for (i = 0; i < iovmax; i++) {
                if (buflen <= 0)
                        break;
                tlen = buflen;
                if (tlen > maxseg)
                        tlen = maxseg;
                iov[i].iov_base = buf;
                iov[i].iov_len = tlen;
                buf += tlen;
                buflen -= tlen;
        }

        uio->uio_iov = iov;
        uio->uio_iovcnt = i;
}