/* $NetBSD: mkbootimage.c,v 1.8 2026/01/09 16:35:27 christos Exp $ */

/*
 * Copyright (c) 1999 Christopher G. Demetriou.  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. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Christopher G. Demetriou
 *      for the NetBSD Project.
 * 4. 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 BY THE AUTHOR ``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 <sys/param.h>                          /* XXX for roundup, howmany */
#include <sys/stat.h>
#include <sys/endian.h>
#include <sys/bootblock.h>
#include <sys/disklabel.h>
#include <assert.h>
#include <err.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

static void usage(void);

static void
usage(void)
{
        fprintf(stderr,
            "usage: %s [-n] [-v] inputfile [outputfile]\n", getprogname());
        exit(EXIT_FAILURE);
}

int
main(int argc, char **argv)
{
        struct stat insb;
        struct alpha_boot_block *bb;
        const char *infile, *outfile;
        char *outbuf;
        size_t outbufsize;
        ssize_t rv;
        int c, verbose, nowrite, infd, outfd;

        verbose = nowrite = 0;

        while ((c = getopt(argc, argv, "nv")) != -1) {
                switch (c) {
                case 'n':
                        /* Do not actually write the boot file */
                        nowrite = 1;
                        break;
                case 'v':
                        /* Chat */
                        verbose = 1;
                        break;
                default:
                        usage();
                }
        }

        argc -= optind;
        argv += optind;

        if (argc != 1 && argc != 2)
                usage();

        infile = argv[0];
        outfile = argv[1];              /* NULL if argc == 1 */

        if (verbose) {
                fprintf(stderr, "input file: %s\n", infile);
                fprintf(stderr, "output file: %s\n",
                    outfile != NULL ? outfile : "<stdout>");
        }
        if (sizeof (struct alpha_boot_block) != ALPHA_BOOT_BLOCK_BLOCKSIZE)
                errx(EXIT_FAILURE,
                    "alpha_boot_block structure badly sized (build error)");

        /* Open the input file and check it out */
        if ((infd = open(infile, O_RDONLY)) == -1)
                err(EXIT_FAILURE, "open %s", infile);
        if (fstat(infd, &insb) == -1)
                err(EXIT_FAILURE, "fstat %s", infile);
        if (!S_ISREG(insb.st_mode))
                errx(EXIT_FAILURE, "%s must be a regular file", infile);

        /*
         * Allocate a buffer, with space to round up the input file
         * to the next block size boundary, and with space for the boot
         * block. 
         */
        outbufsize = roundup(insb.st_size, ALPHA_BOOT_BLOCK_BLOCKSIZE);
        outbufsize += sizeof (struct alpha_boot_block);

        outbuf = malloc(outbufsize);
        if (outbuf == NULL)
                err(EXIT_FAILURE, "allocating output buffer");
        memset(outbuf, 0, outbufsize);

        /* read the file into the buffer, leaving room for the boot block */
        rv = read(infd, outbuf + sizeof (struct alpha_boot_block),
            insb.st_size);
        if (rv == -1)
                err(EXIT_FAILURE, "read %s", infile);
        else if (rv != insb.st_size)
                errx(EXIT_FAILURE, "read %s: short read", infile);
        (void)close(infd);

        /* fill in the boot block fields, and checksum the boot block */
        bb = (struct alpha_boot_block *)outbuf;
        bb->bb_secsize = howmany(insb.st_size, ALPHA_BOOT_BLOCK_BLOCKSIZE);
        bb->bb_secstart = 1;
        bb->bb_flags = 0;
        ALPHA_BOOT_BLOCK_CKSUM(bb, &bb->bb_cksum);

        if (verbose) {
                fprintf(stderr, "starting sector: %qu\n",
                    (unsigned long long)bb->bb_secstart);
                fprintf(stderr, "sector count: %qu\n",
                    (unsigned long long)bb->bb_secsize);
                fprintf(stderr, "checksum: %#qx\n",
                    (unsigned long long)bb->bb_cksum);
        }

        if (nowrite)
                exit(EXIT_SUCCESS);

        /* set up the output file descriptor */
        if (outfile == NULL) {
                outfd = STDOUT_FILENO;
                outfile = "<stdout>";
        } else if ((outfd = open(outfile, O_WRONLY|O_CREAT, 0666)) == -1)
                err(EXIT_FAILURE, "open %s", outfile);

        /* write the data */
        rv = write(outfd, outbuf, outbufsize);
        if (rv == -1)
                err(EXIT_FAILURE, "write %s", outfile);
        else if (rv != outbufsize)
                errx(EXIT_FAILURE, "write %s: short write", outfile);
        (void)close(outfd);

        exit(EXIT_SUCCESS);
}