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FreeDOS/sys/sys.c

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/***************************************************************
sys.c
DOS-C
sys utility for DOS-C
Copyright (c) 1991
Pasquale J. Villani
All Rights Reserved
This file is part of DOS-C.
DOS-C is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 2, or (at your option) any later version.
DOS-C is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
You should have received a copy of the GNU General Public License along with
DOS-C; see the file COPYING. If not, write to the Free Software Foundation,
675 Mass Ave, Cambridge, MA 02139, USA.
***************************************************************/
#define DEBUG
/* #define DDEBUG */
#define SYS_VERSION "v3.4"
#include <stdlib.h>
#include <dos.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/stat.h>
#ifdef __TURBOC__
#include <mem.h>
#else
#include <memory.h>
#endif
#include <string.h>
#ifdef __TURBOC__
#include <dir.h>
#endif
#define SYS_MAXPATH 260
#include "portab.h"
#include "algnbyte.h"
#include "device.h"
#include "dcb.h"
#include "xstructs.h"
#include "date.h"
#include "../hdr/time.h"
#include "fat.h"
/* These definitions deliberately put here instead of
* #including <stdio.h> to make executable MUCH smaller
* using [s]printf from prf.c!
*/
extern int VA_CDECL printf(const char * fmt, ...);
extern int VA_CDECL sprintf(char * buff, const char * fmt, ...);
#include "fat12com.h"
#include "fat16com.h"
#ifdef WITHFAT32
#include "fat32chs.h"
#include "fat32lba.h"
#endif
#ifndef __WATCOMC__
#include <io.h>
#else
long filelength(int __handle);
#pragma aux filelength = \
"mov ax, 0x4202" \
"xor cx, cx" \
"xor dx, dx" \
"int 0x21" \
"push ax" \
"push dx" \
"mov ax, 0x4200" \
"xor cx, cx" \
"xor dx, dx" \
"int 0x21" \
"pop dx" \
"pop ax" \
parm [bx] \
modify [cx] \
value [dx ax];
extern int unlink(const char *pathname);
/* some non-conforming functions to make the executable smaller */
int open(const char *pathname, int flags, ...)
{
int handle;
int result = (flags & O_CREAT ?
_dos_creat(pathname, _A_NORMAL, &handle) :
_dos_open(pathname, flags & (O_RDONLY | O_WRONLY | O_RDWR),
&handle));
return (result == 0 ? handle : -1);
}
int read(int fd, void *buf, unsigned count)
{
unsigned bytes;
int result = _dos_read(fd, buf, count, &bytes);
return (result == 0 ? bytes : -1);
}
int write(int fd, const void *buf, unsigned count)
{
unsigned bytes;
int result = _dos_write(fd, buf, count, &bytes);
return (result == 0 ? bytes : -1);
}
#define close _dos_close
int stat(const char *file_name, struct stat *buf)
{
struct find_t find_tbuf;
UNREFERENCED_PARAMETER(buf);
return _dos_findfirst(file_name, _A_NORMAL | _A_HIDDEN | _A_SYSTEM, &find_tbuf);
}
/* WATCOM's getenv is case-insensitive which wastes a lot of space
for our purposes. So here's a simple case-sensitive one */
char *getenv(const char *name)
{
char **envp, *ep;
const char *np;
char ec, nc;
for (envp = environ; (ep = *envp) != NULL; envp++) {
np = name;
do {
ec = *ep++;
nc = *np++;
if (nc == 0) {
if (ec == '=')
return ep;
break;
}
} while (ec == nc);
}
return NULL;
}
#endif
BYTE pgm[] = "SYS";
void put_boot(int, char *, char *, int, int);
BOOL check_space(COUNT, ULONG);
BOOL get_full_path(BYTE * srcPath, BYTE * rootPath, BYTE * filename, BYTE *source);
BOOL copy(BYTE *source, COUNT drive, BYTE * filename);
#define SEC_SIZE 512
#define COPY_SIZE 0x7e00
struct bootsectortype {
UBYTE bsJump[3];
char OemName[8];
UWORD bsBytesPerSec;
UBYTE bsSecPerClust;
UWORD bsResSectors;
UBYTE bsFATs;
UWORD bsRootDirEnts;
UWORD bsSectors;
UBYTE bsMedia;
UWORD bsFATsecs;
UWORD bsSecPerTrack;
UWORD bsHeads;
ULONG bsHiddenSecs;
ULONG bsHugeSectors;
UBYTE bsDriveNumber;
UBYTE bsReserved1;
UBYTE bsBootSignature;
ULONG bsVolumeID;
char bsVolumeLabel[11];
char bsFileSysType[8];
};
struct bootsectortype32 {
UBYTE bsJump[3];
char OemName[8];
UWORD bsBytesPerSec;
UBYTE bsSecPerClust;
UWORD bsResSectors;
UBYTE bsFATs;
UWORD bsRootDirEnts;
UWORD bsSectors;
UBYTE bsMedia;
UWORD bsFATsecs;
UWORD bsSecPerTrack;
UWORD bsHeads;
ULONG bsHiddenSecs;
ULONG bsHugeSectors;
ULONG bsBigFatSize;
UBYTE bsFlags;
UBYTE bsMajorVersion;
UWORD bsMinorVersion;
ULONG bsRootCluster;
UWORD bsFSInfoSector;
UWORD bsBackupBoot;
ULONG bsReserved2[3];
UBYTE bsDriveNumber;
UBYTE bsReserved3;
UBYTE bsExtendedSignature;
ULONG bsSerialNumber;
char bsVolumeLabel[11];
char bsFileSystemID[8];
};
/*
* globals needed by put_boot & check_space
*/
enum {FAT12 = 12, FAT16 = 16, FAT32 = 32} fs; /* file system type */
/* static */ struct xfreespace x; /* we make this static to be 0 by default -
this avoids FAT misdetections */
#define SBOFFSET 11
#define SBSIZE (sizeof(struct bootsectortype) - SBOFFSET)
#define SBSIZE32 (sizeof(struct bootsectortype32) - SBOFFSET)
/* essentially - verify alignment on byte boundaries at compile time */
struct VerifyBootSectorSize {
char failure1[sizeof(struct bootsectortype) == 62 ? 1 : -1];
char failure2[sizeof(struct bootsectortype) == 62 ? 1 : 0];
/* (Watcom has a nice warning for this, by the way) */
};
int FDKrnConfigMain(int argc, char **argv);
/* FreeDOS sys, we default to our kernel and load segment, but
if not found (or explicitly given) support OEM DOS variants
(such as DR-DOS or a FreeDOS kernel mimicing other DOSes).
PC-DOS requires particular steps from the boot loader, which
we do not currently fullfill, so it will not boot and MS-DOS
uses different names, so it also will not work.
*/
#define FDKERNEL "KERNEL.SYS"
#define OEMKERNEL "IBMBIO.COM"
#define OEMDOS "IBMDOS.COM"
#define FDLOADSEG 0x60
#define OEMLOADSEG 0x70
int main(int argc, char **argv)
{
COUNT drive; /* destination drive */
COUNT drivearg = 0; /* drive argument position */
COUNT srcarg = 0; /* source argument position */
BYTE *bsFile = NULL; /* user specified destination boot sector */
unsigned srcDrive; /* source drive */
BYTE srcPath[SYS_MAXPATH]; /* user specified source drive and/or path */
BYTE rootPath[4]; /* alternate source path to try if not '\0' */
BYTE srcFile[SYS_MAXPATH]; /* full path+name of [kernel] file to copy */
WORD slen;
int argno = 0;
int bootonly = 0;
int both = 0;
char *kernel_name = FDKERNEL;
int load_segment = FDLOADSEG;
int altkern = 0; /* use OEM kernel values instead of FD ones */
printf("FreeDOS System Installer " SYS_VERSION ", " __DATE__ "\n\n");
if (argc > 1 && memicmp(argv[1], "CONFIG", 6) == 0)
{
exit(FDKrnConfigMain(argc, argv));
}
for(argno = 1; argno < argc; argno++)
{
char *argp = argv[argno];
if (argp[1] == ':' && argp[2] == '\0' && drivearg <= srcarg)
drivearg = argno;
if (srcarg == 0)
{
srcarg = argno;
}
else if (memicmp(argp, "BOTH", 4) == 0 && !both)
{
both = 1;
}
else if (argp[0] == '/') /* optional switch */
{
argp++; /* skip past the '/' character */
if (memicmp(argp, "OEM", 3) == 0)
{
altkern = 1; /* kernel is split into 2 files and update BS name */
kernel_name = OEMKERNEL;
load_segment = OEMLOADSEG;
}
else if (memicmp(argp, "BOOTONLY", 8) == 0)
{
bootonly = 1;
}
else if (argno + 1 < argc) /* two part options, /SWITCH VALUE */
{
argno++;
if (toupper(*argp) == 'K') /* set Kernel name */
{
kernel_name = argv[argno];
}
else if (toupper(*argp) == 'L') /* set Load segment */
{
load_segment = (int)strtol(argv[argno], NULL, 16);
}
}
}
else if (drivearg != argno)
{
if (bsFile == NULL)
{
bsFile = argp;
}
else
{
drivearg = 0;
break;
}
}
} /* for() */
if (drivearg == 0)
{
printf(
"Usage: \n"
"%s [source] drive: [bootsect [BOTH]] [/BOOTONLY] [/OEM] [/K name] [/L segm]\n"
" source = A:,B:,C:\\KERNEL\\BIN\\,etc., or current directory if not given\n"
" drive = A,B,etc.\n"
" bootsect = name of 512-byte boot sector file image for drive:\n"
" to write to *instead* of real boot sector\n"
" BOTH : write to *both* the real boot sector and the image file\n"
" /BOOTONLY: do *not* copy kernel / shell, only update boot sector or image\n"
" /OEM : indicates kernel is IBMIO.SYS/IBMDOS.SYS loaded at 0x70\n"
" /K name : name of kernel to use instead of KERNEL.SYS\n"
" /L segm : hex load segment to use instead of 60\n"
"%s CONFIG /help\n", pgm, pgm);
exit(1);
}
drive = toupper(argv[drivearg][0]) - 'A';
if (drive < 0 || drive >= 26)
{
printf("%s: drive %c must be A:..Z:\n", pgm,
*argv[(argc == 3 ? 2 : 1)]);
exit(1);
}
srcPath[0] = '\0';
if (drivearg > srcarg && srcarg)
{
strncpy(srcPath, argv[srcarg], SYS_MAXPATH - 12);
/* leave room for COMMAND.COM\0 */
srcPath[SYS_MAXPATH - 13] = '\0';
/* make sure srcPath + "file" is a valid path */
slen = strlen(srcPath);
if ((srcPath[slen - 1] != ':') &&
((srcPath[slen - 1] != '\\') || (srcPath[slen - 1] != '/')))
{
srcPath[slen] = '\\';
slen++;
srcPath[slen] = '\0';
}
}
/* Get source drive */
if ((strlen(srcPath) > 1) && (srcPath[1] == ':')) /* src specifies drive */
srcDrive = toupper(*srcPath) - 'A';
else /* src doesn't specify drive, so assume current drive */
{
#ifdef __TURBOC__
srcDrive = (unsigned) getdisk();
#else
_dos_getdrive(&srcDrive);
srcDrive--;
#endif
}
/* Don't try root if src==dst drive or source path given */
if ((drive == srcDrive)
|| (*srcPath
&& ((srcPath[1] != ':') || ((srcPath[1] == ':') && srcPath[2]))))
*rootPath = '\0';
else
sprintf(rootPath, "%c:\\", 'A' + srcDrive);
/* unless we are only setting boot sector, verify kernel file exists */
if (!bootonly)
{
/* if FDKERNEL not found and an explicit kernel name was not specified,
then see if OEM kernel available and switch to it instead. */
if (!get_full_path(srcPath, rootPath, kernel_name, srcFile) && (kernel_name == FDKERNEL))
{
if (!get_full_path(srcPath, rootPath, OEMKERNEL, srcFile))
{
printf("\n%s: failed to find kernel file %s\n", pgm, kernel_name);
exit(1);
}
else /* else OEM kernel found, so switch modes */
{
altkern = 1;
kernel_name = OEMKERNEL;
load_segment = OEMLOADSEG;
}
}
}
printf("Processing boot sector...\n");
put_boot(drive, bsFile, kernel_name, load_segment, both);
if (!bootonly)
{
if (!copy(srcFile, drive, kernel_name))
{
printf("\n%s: cannot copy \"%s\"\n", pgm, kernel_name);
exit(1);
} /* copy kernel */
if (altkern)
{
if ( (!get_full_path(srcPath, rootPath, OEMDOS, srcFile)) ||
(!copy(srcFile, drive, OEMDOS)) )
{
printf("\n%s: cannot copy \"%s\"\n", pgm, OEMDOS);
exit(1);
}
}
/* copy command.com, 1st try source path, then try %COMSPEC% */
if (!get_full_path(srcPath, rootPath, "COMMAND.COM", srcFile))
{
char *comspec = getenv("COMSPEC");
if ( (comspec == NULL) ||
(!get_full_path(comspec, NULL, "COMMAND.COM", srcFile)) )
{
printf("\n%s: failed to find command interpreter (shell) file %s\n", pgm, "COMMAND.COM");
exit(1);
}
printf("%s: Using shell from %COMSPEC% \"%s\"\n", pgm, comspec);
}
if (!copy(srcFile, drive, "COMMAND.COM"))
{
printf("\n%s: cannot copy \"%s\"\n", pgm, "COMMAND.COM");
exit(1);
} /* copy shell */
}
printf("\nSystem transferred.\n");
return 0;
}
#ifdef DDEBUG
VOID dump_sector(unsigned char far * sec)
{
COUNT x, y;
char c;
for (x = 0; x < 32; x++)
{
printf("%03X ", x * 16);
for (y = 0; y < 16; y++)
{
printf("%02X ", sec[x * 16 + y]);
}
for (y = 0; y < 16; y++)
{
c = sec[x * 16 + y];
if (isprint(c))
printf("%c", c);
else
printf(".");
}
printf("\n");
}
printf("\n");
}
#endif
#ifdef __WATCOMC__
int absread(int DosDrive, int nsects, int foo, void *diskReadPacket);
#pragma aux absread = \
"push bp" \
"int 0x25" \
"sbb ax, ax" \
"popf" \
"pop bp" \
parm [ax] [cx] [dx] [bx] \
modify [si di] \
value [ax];
int abswrite(int DosDrive, int nsects, int foo, void *diskReadPacket);
#pragma aux abswrite = \
"push bp" \
"int 0x26" \
"sbb ax, ax" \
"popf" \
"pop bp" \
parm [ax] [cx] [dx] [bx] \
modify [si di] \
value [ax];
int fat32readwrite(int DosDrive, void *diskReadPacket, unsigned intno);
#pragma aux fat32readwrite = \
"mov ax, 0x7305" \
"mov cx, 0xffff" \
"int 0x21" \
"sbb ax, ax" \
parm [dx] [bx] [si] \
modify [cx dx si] \
value [ax];
void reset_drive(int DosDrive);
#pragma aux reset_drive = \
"push ds" \
"inc dx" \
"mov ah, 0xd" \
"int 0x21" \
"mov ah,0x32" \
"int 0x21" \
"pop ds" \
parm [dx] \
modify [ax bx];
void truename(char far *dest, const char *src);
#pragma aux truename = \
"mov ah,0x60" \
"int 0x21" \
parm [es di] [si];
int generic_block_ioctl(unsigned drive, unsigned cx, unsigned char *par);
#pragma aux generic_block_ioctl = \
"mov ax, 0x440d" \
"int 0x21" \
"sbb ax, ax" \
value [ax] \
parm [bx] [cx] [dx]; /* BH must be 0 for lock! */
#else
#ifndef __TURBOC__
int2526readwrite(int DosDrive, void *diskReadPacket, unsigned intno)
{
union REGS regs;
regs.h.al = (BYTE) DosDrive;
regs.x.bx = (short)diskReadPacket;
regs.x.cx = 0xffff;
int86(intno, &regs, &regs);
return regs.x.cflag;
}
#define absread(DosDrive, foo, cx, diskReadPacket) \
int2526readwrite(DosDrive, diskReadPacket, 0x25)
#define abswrite(DosDrive, foo, cx, diskReadPacket) \
int2526readwrite(DosDrive, diskReadPacket, 0x26)
#endif
int fat32readwrite(int DosDrive, void *diskReadPacket, unsigned intno)
{
union REGS regs;
regs.x.ax = 0x7305;
regs.h.dl = DosDrive;
regs.x.bx = (short)diskReadPacket;
regs.x.cx = 0xffff;
regs.x.si = intno;
intdos(&regs, &regs);
return regs.x.cflag;
} /* fat32readwrite */
void reset_drive(int DosDrive)
{
union REGS regs;
regs.h.ah = 0xd;
intdos(&regs, &regs);
regs.h.ah = 0x32;
regs.h.dl = DosDrive + 1;
intdos(&regs, &regs);
} /* reset_drive */
int generic_block_ioctl(unsigned drive, unsigned cx, unsigned char *par)
{
union REGS regs;
regs.x.ax = 0x440d;
regs.x.cx = cx;
regs.x.dx = (unsigned)par;
regs.x.bx = drive; /* BH must be 0 for lock! */
intdos(&regs, &regs);
return regs.x.cflag;
} /* generic_block_ioctl */
void truename(char *dest, const char *src)
{
union REGS regs;
struct SREGS sregs;
regs.h.ah = 0x60;
sregs.es = FP_SEG(dest);
regs.x.di = FP_OFF(dest);
sregs.ds = FP_SEG(src);
regs.x.si = FP_OFF(src);
intdosx(&regs, &regs, &sregs);
} /* truename */
#endif
int MyAbsReadWrite(int DosDrive, int count, ULONG sector, void *buffer,
int write)
{
struct {
unsigned long sectorNumber;
unsigned short count;
void far *address;
} diskReadPacket;
diskReadPacket.sectorNumber = sector;
diskReadPacket.count = count;
diskReadPacket.address = buffer;
if ((!write && absread(DosDrive, -1, -1, &diskReadPacket) == -1)
|| (write && abswrite(DosDrive, -1, -1, &diskReadPacket) == -1))
{
#ifdef WITHFAT32
return fat32readwrite(DosDrive + 1, &diskReadPacket, write);
#else
return 0xff;
#endif
}
return 0;
} /* MyAbsReadWrite */
#ifdef __WATCOMC__
unsigned getextdrivespace(void far *drivename, void *buf, unsigned buf_size);
#pragma aux getextdrivespace = \
"mov ax, 0x7303" \
"stc" \
"int 0x21" \
"sbb ax, ax" \
parm [es dx] [di] [cx] \
value [ax];
#else /* !defined __WATCOMC__ */
unsigned getextdrivespace(void *drivename, void *buf, unsigned buf_size)
{
union REGS regs;
struct SREGS sregs;
regs.x.ax = 0x7303; /* get extended drive free space */
sregs.es = FP_SEG(buf);
regs.x.di = FP_OFF(buf);
sregs.ds = FP_SEG(drivename);
regs.x.dx = FP_OFF(drivename);
regs.x.cx = buf_size;
intdosx(&regs, &regs, &sregs);
return regs.x.ax == 0x7300 || regs.x.cflag;
} /* getextdrivespace */
#endif /* defined __WATCOMC__ */
#ifdef __WATCOMC__
/*
* If BIOS has got LBA extensions, after the Int 13h call BX will be 0xAA55.
* If extended disk access functions are supported, bit 0 of CX will be set.
*/
BOOL haveLBA(void); /* return TRUE if we have LBA BIOS, FALSE otherwise */
#pragma aux haveLBA = \
"mov ax, 0x4100" /* IBM/MS Int 13h Extensions - installation check */ \
"mov bx, 0x55AA" \
"mov dl, 0x80" \
"int 0x13" \
"xor ax, ax" \
"cmp bx, 0xAA55" \
"jne quit" \
"and cx, 1" \
"xchg cx, ax" \
"quit:" \
modify [bx cx] \
value [ax];
#else
BOOL haveLBA(void)
{
union REGS r;
r.x.ax = 0x4100;
r.x.bx = 0x55AA;
r.h.dl = 0x80;
int86(0x13, &r, &r);
return r.x.bx == 0xAA55 && r.x.cx & 1;
}
#endif
void correct_bpb(struct bootsectortype *default_bpb,
struct bootsectortype *oldboot)
{
/* don't touch partitions (floppies most likely) that don't have hidden
sectors */
if (default_bpb->bsHiddenSecs == 0)
return;
#ifdef DEBUG
printf("Old boot sector values: sectors/track: %u, heads: %u, hidden: %lu\n",
oldboot->bsSecPerTrack, oldboot->bsHeads, oldboot->bsHiddenSecs);
printf("Default and new boot sector values: sectors/track: %u, heads: %u, "
"hidden: %lu\n", default_bpb->bsSecPerTrack, default_bpb->bsHeads,
default_bpb->bsHiddenSecs);
#endif
oldboot->bsSecPerTrack = default_bpb->bsSecPerTrack;
oldboot->bsHeads = default_bpb->bsHeads;
oldboot->bsHiddenSecs = default_bpb->bsHiddenSecs;
}
void put_boot(int drive, char *bsFile, char *kernel_name, int load_seg, int both)
{
#ifdef WITHFAT32
struct bootsectortype32 *bs32;
#endif
struct bootsectortype *bs;
static unsigned char oldboot[SEC_SIZE], newboot[SEC_SIZE];
static unsigned char default_bpb[0x5c];
#ifdef DEBUG
printf("Reading old bootsector from drive %c:\n", drive + 'A');
#endif
/* lock drive */
generic_block_ioctl(drive + 1, 0x84a, NULL);
reset_drive(drive);
/* suggestion: allow reading from a boot sector or image file here */
if (MyAbsReadWrite(drive, 1, 0, oldboot, 0) != 0)
{
printf("can't read old boot sector for drive %c:\n", drive + 'A');
exit(1);
}
#ifdef DDEBUG
printf("Old Boot Sector:\n");
dump_sector(oldboot);
#endif
bs = (struct bootsectortype *)&oldboot;
if (bs->bsBytesPerSec != SEC_SIZE)
{
printf("Sector size is not 512 but %d bytes - not currently supported!\n",
bs->bsBytesPerSec);
exit(1); /* Japan?! */
}
{
/* see "FAT: General Overview of On-Disk Format" v1.02, 5.V.1999
* (http://www.nondot.org/sabre/os/files/FileSystems/FatFormat.pdf)
*/
ULONG fatSize, totalSectors, dataSectors, clusters;
UCOUNT rootDirSectors;
bs32 = (struct bootsectortype32 *)&oldboot;
rootDirSectors = (bs->bsRootDirEnts * DIRENT_SIZE /* 32 */
+ bs32->bsBytesPerSec - 1) / bs32->bsBytesPerSec;
fatSize = bs32->bsFATsecs ? bs32->bsFATsecs : bs32->bsBigFatSize;
totalSectors = bs32->bsSectors ? bs32->bsSectors : bs32->bsHugeSectors;
dataSectors = totalSectors
- bs32->bsResSectors - (bs32->bsFATs * fatSize) - rootDirSectors;
clusters = dataSectors / bs32->bsSecPerClust;
if (clusters < FAT_MAGIC) /* < 4085 */
fs = FAT12;
else if (clusters < FAT_MAGIC16) /* < 65525 */
fs = FAT16;
else
fs = FAT32;
}
/* bit 0 set if function to use current BPB, clear if Device
BIOS Parameter Block field contains new default BPB
bit 1 set if function to use track layout fields only
must be clear if CL=60h
bit 2 set if all sectors in track same size (should be set) (RBIL) */
default_bpb[0] = 4;
if (fs == FAT32)
{
printf("FAT type: FAT32\n");
/* get default bpb (but not for floppies) */
if (drive >= 2 &&
generic_block_ioctl(drive + 1, 0x4860, default_bpb) == 0)
correct_bpb((struct bootsectortype *)(default_bpb + 7 - 11), bs);
#ifdef WITHFAT32 /* copy one of the FAT32 boot sectors */
memcpy(newboot, haveLBA() ? fat32lba : fat32chs, SEC_SIZE);
#else
printf("SYS hasn't been compiled with FAT32 support.\n"
"Consider using -DWITHFAT32 option.\n");
exit(1);
#endif
}
else
{ /* copy the FAT12/16 CHS+LBA boot sector */
printf("FAT type: FAT1%c\n", fs + '0' - 10);
if (drive >= 2 &&
generic_block_ioctl(drive + 1, 0x860, default_bpb) == 0)
correct_bpb((struct bootsectortype *)(default_bpb + 7 - 11), bs);
memcpy(newboot, fs == FAT16 ? fat16com : fat12com, SEC_SIZE);
}
/* Copy disk parameter from old sector to new sector */
#ifdef WITHFAT32
if (fs == FAT32)
memcpy(&newboot[SBOFFSET], &oldboot[SBOFFSET], SBSIZE32);
else
#endif
memcpy(&newboot[SBOFFSET], &oldboot[SBOFFSET], SBSIZE);
bs = (struct bootsectortype *)&newboot;
/* originally OemName was "FreeDOS", changed for better compatibility */
memcpy(bs->OemName, "FRDOS4.1", 8);
#ifdef WITHFAT32
if (fs == FAT32)
{
bs32 = (struct bootsectortype32 *)&newboot;
/* put 0 for A: or B: (force booting from A:), otherwise use DL */
bs32->bsDriveNumber = drive < 2 ? 0 : 0xff;
/* the location of the "0060" segment portion of the far pointer
in the boot sector is just before cont: in boot*.asm.
This happens to be offset 0x78 (=0x3c * 2) for FAT32 and
offset 0x5c (=0x2e * 2) for FAT16 */
/* i.e. BE CAREFUL WHEN YOU CHANGE THE BOOT SECTORS !!! */
((int *)newboot)[0x3C] = load_seg;
#ifdef DEBUG
printf(" FAT starts at sector %lx + %x\n",
bs32->bsHiddenSecs, bs32->bsResSectors);
#endif
}
else
#endif
{
/* put 0 for A: or B: (force booting from A:), otherwise use DL */
bs->bsDriveNumber = drive < 2 ? 0 : 0xff;
((int *)newboot)[0x2E] = load_seg;
}
#ifdef DEBUG /* add an option to display this on user request? */
printf("Root dir entries = %u\n", bs->bsRootDirEnts);
printf("FAT starts at sector (%lu + %u)\n",
bs->bsHiddenSecs, bs->bsResSectors);
printf("Root directory starts at sector (PREVIOUS + %u * %u)\n",
bs->bsFATsecs, bs->bsFATs);
#endif
{
int i = 0;
memset(&newboot[0x1f1], ' ', 11);
while (kernel_name[i] && kernel_name[i] != '.')
{
if (i < 8)
newboot[0x1f1+i] = toupper(kernel_name[i]);
i++;
}
if (kernel_name[i] == '.')
{
/* copy extension */
int j = 0;
i++;
while (kernel_name[i+j] && j < 3)
{
newboot[0x1f9+j] = toupper(kernel_name[i+j]);
j++;
}
}
}
#ifdef DEBUG
/* there's a zero past the kernel name in all boot sectors */
printf("Boot sector kernel name set to %s\n", &newboot[0x1f1]);
printf("Boot sector load segment set to %Xh\n", load_seg);
#endif
#ifdef DDEBUG
printf("\nNew Boot Sector:\n");
dump_sector(newboot);
#endif
if ((bsFile == NULL) || both)
{
#ifdef DEBUG
printf("writing new bootsector to drive %c:\n", drive + 'A');
#endif
/* write newboot to a drive */
if (MyAbsReadWrite(drive, 1, 0, newboot, 1) != 0)
{
printf("Can't write new boot sector to drive %c:\n", drive + 'A');
exit(1);
}
} /* if write boot sector */
if (bsFile != NULL)
{
int fd;
#ifdef DEBUG
printf("writing new bootsector to file %s\n", bsFile);
#endif
/* write newboot to bsFile */
if ((fd = /* suggestion: do not trunc - allows to write to images */
open(bsFile, O_RDWR | O_TRUNC | O_CREAT | O_BINARY,
S_IREAD | S_IWRITE)) < 0)
{
printf(" %s: can't create\"%s\"\nDOS errnum %d", pgm, bsFile, errno);
exit(1);
}
if (write(fd, newboot, SEC_SIZE) != SEC_SIZE)
{
printf("Can't write %u bytes to %s\n", SEC_SIZE, bsFile);
close(fd);
unlink(bsFile);
exit(1);
}
close(fd);
} /* if write boot sector file */
reset_drive(drive);
/* unlock_drive */
generic_block_ioctl(drive + 1, 0x86a, NULL);
} /* put_boot */
/*
* Returns TRUE if `drive` has at least `bytes` free space, FALSE otherwise.
* put_sector() must have been already called to determine file system type.
*/
BOOL check_space(COUNT drive, ULONG bytes)
{
#ifdef WITHFAT32
if (fs == FAT32)
{
char *drivename = "A:\\";
drivename[0] = 'A' + drive;
getextdrivespace(drivename, &x, sizeof(x));
return x.xfs_freeclusters > (bytes / (x.xfs_clussize * x.xfs_secsize));
}
else
#endif
{
#ifdef __TURBOC__
struct dfree df;
getdfree(drive + 1, &df);
return (ULONG)df.df_avail * df.df_sclus * df.df_bsec >= bytes;
#else
struct _diskfree_t df;
_dos_getdiskfree(drive + 1, &df);
return (ULONG)df.avail_clusters * df.sectors_per_cluster
* df.bytes_per_sector >= bytes;
#endif
}
} /* check_space */
/* returns TRUE if file exists, FALSE otherwise
1st checks for srcPath + filename, if that does not exist then
will check for rootPath + filename
On failure, source is undefined. source must be >= SYS_MAXPATH bytes
*/
BOOL get_full_path(BYTE * srcPath, BYTE * rootPath, BYTE * filename, BYTE *source)
{
struct stat fstatbuf;
strcpy(source, srcPath);
if (rootPath != NULL) /* trick for comspec, append filename if srcPath doesn't include it */
strcat(source, filename);
/* check if file exists in source directory */
if (stat(source, &fstatbuf))
{
/* not found in source path, so try root of source drive */
if ((rootPath != NULL) && (*rootPath) /* && (errno == ENOENT) */ )
{
sprintf(source, "%s%s", rootPath, filename);
if (stat(source, &fstatbuf))
return FALSE;
}
else
return FALSE;
}
return TRUE;
} /* get_full_path */
BYTE copybuffer[COPY_SIZE];
/* copies file (path+filename specified by srcFile) to drive:\filename */
BOOL copy(BYTE *source, COUNT drive, BYTE * filename)
{
static BYTE dest[SYS_MAXPATH];
unsigned ret;
int fdin, fdout;
ULONG copied = 0;
printf("\nCopying %s...\n", source);
truename(dest, source);
strcpy(source, dest);
sprintf(dest, "%c:\\%s", 'A' + drive, filename);
if (stricmp(source, dest) == 0)
{
printf("%s: source and destination are identical: skipping \"%s\"\n",
pgm, source);
return TRUE;
}
if ((fdin = open(source, O_RDONLY | O_BINARY)) < 0)
{
printf("%s: failed to open \"%s\"\n", pgm, source);
return FALSE;
}
if (!check_space(drive, filelength(fdin)))
{
printf("%s: Not enough space to transfer %s\n", pgm, filename);
close(fdin);
exit(1);
}
if ((fdout =
open(dest, O_RDWR | O_TRUNC | O_CREAT | O_BINARY,
S_IREAD | S_IWRITE)) < 0)
{
printf(" %s: can't create\"%s\"\nDOS errnum %d", pgm, dest, errno);
close(fdin);
return FALSE;
}
while ((ret = read(fdin, copybuffer, COPY_SIZE)) > 0)
{
if (write(fdout, copybuffer, ret) != ret)
{
printf("Can't write %u bytes to %s\n", ret, dest);
close(fdout);
unlink(dest);
break;
}
copied += ret;
}
{
#if defined __WATCOMC__ || defined _MSC_VER /* || defined __BORLANDC__ */
unsigned short date, time;
_dos_getftime(fdin, &date, &time);
_dos_setftime(fdout, date, time);
#elif defined __TURBOC__
struct ftime ftime;
getftime(fdin, &ftime);
setftime(fdout, &ftime);
#endif
}
close(fdin);
close(fdout);
#ifdef __SOME_OTHER_COMPILER__
{
#include <utime.h>
struct utimbuf utimb;
utimb.actime = /* access time */
utimb.modtime = fstatbuf.st_mtime; /* modification time */
utime(dest, &utimb);
};
#endif
printf("%lu Bytes transferred", copied);
return TRUE;
} /* copy */
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