4684ddb6aa
- import libcxx - reduce targets to the one when compiled as a tools Change-Id: Iabb8427f80ff8e89463559a28bcb8b4f2bdbc496
121 lines
3.2 KiB
C
121 lines
3.2 KiB
C
/* Based on original installboot from MINIX 3.
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*
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* installboot 3.0 - Make a device bootable Author: Kees J. Bot
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* 21 Dec 1991
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include "installboot.h"
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#define BOOTBLOCK 0 /* Of course */
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#define BOOT_BLOCK_SIZE 1024
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#define SIGNATURE 0xAA55 /* Boot block signature. */
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#define SIGPOS 510 /* Where to put signature word. */
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#define PARTPOS 446 /* Offset to the partition table in a master
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* boot block.
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*/
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static int rawfd; /* File descriptor to open device. */
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static const char *rawdev; /* Name of device. */
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static void report(const char *label)
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/* installboot: label: No such file or directory */
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{
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fprintf(stderr, "installboot: %s: %s\n", label, strerror(errno));
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}
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static __dead void fatal(const char *label)
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{
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report(label);
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exit(1);
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}
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static void bread(FILE *f, char *name, void *buf, size_t len)
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/* Read len bytes. Don't dare return without them. */
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{
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if (len > 0 && fread(buf, len, 1, f) != 1) {
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if (ferror(f)) fatal(name);
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fprintf(stderr, "installboot: Unexpected EOF on %s\n", name);
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exit(1);
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}
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}
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static void readblock(off_t blk, char *buf, int block_size)
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/* For rawfs, so that it can read blocks. */
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{
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int n;
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if (lseek(rawfd, blk * block_size, SEEK_SET) < 0
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|| (n= read(rawfd, buf, block_size)) < 0
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) fatal(rawdev);
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if (n < block_size) {
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fprintf(stderr, "installboot: Unexpected EOF on %s\n", rawdev);
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exit(1);
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}
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}
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static void writeblock(off_t blk, const char *buf, int block_size)
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/* Add a function to write blocks for local use. */
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{
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if (lseek(rawfd, blk * block_size, SEEK_SET) < 0
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|| write(rawfd, buf, block_size) < 0
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) fatal(rawdev);
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}
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/* A temp stub until fdisk is ported to MINIX */
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void install_master(const char *device, char *masterboot, char **guide)
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/* Booting a hard disk is a two stage process: The master bootstrap in sector
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* 0 loads the bootstrap from sector 0 of the active partition which in turn
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* starts the operating system. This code installs such a master bootstrap
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* on a hard disk. If guide[0] is non-null then the master bootstrap is
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* guided into booting a certain device.
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*/
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{
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FILE *masf;
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unsigned long size;
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static char buf[BOOT_BLOCK_SIZE];
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/* Open device. */
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if ((rawfd= open(rawdev= device, O_RDWR)) < 0) fatal(device);
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/* Open the master boot code. */
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if ((masf= fopen(masterboot, "r")) == NULL) fatal(masterboot);
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size= PARTPOS;
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/* Read the master boot block, patch it, write. */
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readblock(BOOTBLOCK, buf, BOOT_BLOCK_SIZE);
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memset(buf, 0, PARTPOS);
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(void) bread(masf, masterboot, buf, size);
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/* Install signature. */
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buf[SIGPOS+0]= (SIGNATURE >> 0) & 0xFF;
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buf[SIGPOS+1]= (SIGNATURE >> 8) & 0xFF;
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writeblock(BOOTBLOCK, buf, BOOT_BLOCK_SIZE);
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}
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int isoption(const char *option, const char *test)
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/* Check if the option argument is equals "test". Also accept -i as short
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* for -image, and the special case -x for -extract.
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*/
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{
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if (strcmp(option, test) == 0) return 1;
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if (option[0] != '-' && strlen(option) != 2) return 0;
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if (option[1] == test[1]) return 1;
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if (option[1] == 'x' && test[1] == 'e') return 1;
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return 0;
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}
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