boot/freeldr/freeldr/arcname.c

   1 /*
   2  *  FreeLoader - arcname.c
   3  *
   4  *  Copyright (C) 2001  Brian Palmer  <brianp@sginet.com>
   5  *  Copyright (C) 2001  Eric Kohl
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License along
  18  *  with this program; if not, write to the Free Software Foundation, Inc.,
  19  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include <freeldr.h>
  23
  24 BOOLEAN
  25 DissectArcPath(
  26     IN  PCSTR ArcPath,
  27     OUT PCSTR* Path OPTIONAL,
  28     OUT PUCHAR DriveNumber,
  29     OUT PULONG PartitionNumber)
  30 {
  31     PCCH p;
  32
  33     /* Detect ramdisk path */
  34     if (_strnicmp(ArcPath, "ramdisk(0)", 10) == 0)
  35     {
  36         /* Magic value for ramdisks */
  37         *DriveNumber = 0x49;
  38         *PartitionNumber = 1;
  39
  40         /* Get the path (optional) */
  41         if (Path)
  42         {
  43             p = ArcPath + 11;
  44             *Path = p;
  45         }
  46         return TRUE;
  47     }
  48
  49     /* NOTE: We are currently limited when handling multi()disk() paths!! */
  50     if (_strnicmp(ArcPath, "multi(0)disk(0)", 15) != 0)
  51         return FALSE;
  52
  53     p = ArcPath + 15;
  54     if (_strnicmp(p, "fdisk(", 6) == 0)
  55     {
  56         /*
  57          * Floppy disk path:
  58          *  multi(0)disk(0)fdisk(x)\path
  59          */
  60         p = p + 6;
  61         *DriveNumber = atoi(p);
  62         p = strchr(p, ')');
  63         if (p == NULL)
  64             return FALSE;
  65         ++p;
  66         *PartitionNumber = 0;
  67     }
  68     else if (_strnicmp(p, "cdrom(", 6) == 0)
  69     {
  70         /*
  71          * Cdrom path:
  72          *  multi(0)disk(0)cdrom(x)\path
  73          */
  74         p = p + 6;
  75         *DriveNumber = atoi(p) + 0x80;
  76         p = strchr(p, ')');
  77         if (p == NULL)
  78             return FALSE;
  79         ++p;
  80         *PartitionNumber = 0xff;
  81     }
  82     else if (_strnicmp(p, "rdisk(", 6) == 0)
  83     {
  84         /*
  85          * Hard disk path:
  86          *  multi(0)disk(0)rdisk(x)[partition(y)][\path]
  87          */
  88         p = p + 6;
  89         *DriveNumber = atoi(p) + 0x80;
  90         p = strchr(p, ')');
  91         if (p == NULL)
  92             return FALSE;
  93         ++p;
  94         /* The partition is optional */
  95         if (_strnicmp(p, "partition(", 10) == 0)
  96         {
  97             p = p + 10;
  98             *PartitionNumber = atoi(p);
  99             p = strchr(p, ')');
 100             if (p == NULL)
 101                 return FALSE;
 102             ++p;
 103         }
 104         else
 105         {
 106             *PartitionNumber = 0;
 107         }
 108     }
 109     else
 110     {
 111         return FALSE;
 112     }
 113
 114     /* Get the path (optional) */
 115     if (Path)
 116         *Path = p;
 117
 118     return TRUE;
 119 }
 120
 121 /* PathSyntax: scsi() = 0, multi() = 1, ramdisk() = 2 */
 122 BOOLEAN
 123 DissectArcPath2(
 124     IN  PCSTR ArcPath,
 125     OUT PULONG x,
 126     OUT PULONG y,
 127     OUT PULONG z,
 128     OUT PULONG Partition,
 129     OUT PULONG PathSyntax)
 130 {
 131     /* Detect ramdisk() */
 132     if (_strnicmp(ArcPath, "ramdisk(0)", 10) == 0)
 133     {
 134         *x = *y = *z = 0;
 135         *Partition = 1;
 136         *PathSyntax = 2;
 137         return TRUE;
 138     }
 139     /* Detect scsi()disk()rdisk()partition() */
 140     else if (sscanf(ArcPath, "scsi(%lu)disk(%lu)rdisk(%lu)partition(%lu)", x, y, z, Partition) == 4)
 141     {
 142         *PathSyntax = 0;
 143         return TRUE;
 144     }
 145     /* Detect scsi()cdrom()fdisk() */
 146     else if (sscanf(ArcPath, "scsi(%lu)cdrom(%lu)fdisk(%lu)", x, y, z) == 3)
 147     {
 148         *Partition = 0;
 149         *PathSyntax = 0;
 150         return TRUE;
 151     }
 152     /* Detect multi()disk()rdisk()partition() */
 153     else if (sscanf(ArcPath, "multi(%lu)disk(%lu)rdisk(%lu)partition(%lu)", x, y, z, Partition) == 4)
 154     {
 155         *PathSyntax = 1;
 156         return TRUE;
 157     }
 158     /* Detect multi()disk()cdrom() */
 159     else if (sscanf(ArcPath, "multi(%lu)disk(%lu)cdrom(%lu)", x, y, z) == 3)
 160     {
 161         *Partition = 1;
 162         *PathSyntax = 1;
 163         return TRUE;
 164     }
 165     /* Detect multi()disk()fdisk() */
 166     else if (sscanf(ArcPath, "multi(%lu)disk(%lu)fdisk(%lu)", x, y, z) == 3)
 167     {
 168         *Partition = 1;
 169         *PathSyntax = 1;
 170         return TRUE;
 171     }
 172
 173     /* Unknown syntax */
 174     return FALSE;
 175 }
 176
 177 VOID ConstructArcPath(PCHAR ArcPath, PCHAR SystemFolder, UCHAR Disk, ULONG Partition)
 178 {
 179     char    tmp[50];
 180
 181     strcpy(ArcPath, "multi(0)disk(0)");
 182
 183     if (Disk < 0x80)
 184     {
 185         /*
 186          * Floppy disk path:
 187          *  multi(0)disk(0)fdisk(x)\path
 188          */
 189         sprintf(tmp, "fdisk(%d)", (int) Disk);
 190         strcat(ArcPath, tmp);
 191     }
 192     else
 193     {
 194         /*
 195          * Hard disk path:
 196          *  multi(0)disk(0)rdisk(x)partition(y)\path
 197          */
 198         sprintf(tmp, "rdisk(%d)partition(%d)", (int) (Disk - 0x80), (int) Partition);
 199         strcat(ArcPath, tmp);
 200     }
 201
 202     if (SystemFolder[0] == '\\' || SystemFolder[0] == '/')
 203     {
 204         strcat(ArcPath, SystemFolder);
 205     }
 206     else
 207     {
 208         strcat(ArcPath, "\\");
 209         strcat(ArcPath, SystemFolder);
 210     }
 211 }
 212
 213 #if 0
 214 UCHAR ConvertArcNameToBiosDriveNumber(PCHAR ArcPath)
 215 {
 216     char *    p;
 217     UCHAR        DriveNumber = 0;
 218
 219     if (_strnicmp(ArcPath, "multi(0)disk(0)", 15) != 0)
 220         return 0;
 221
 222     p = ArcPath + 15;
 223     if (_strnicmp(p, "fdisk(", 6) == 0)
 224     {
 225         /*
 226          * Floppy disk path:
 227          *  multi(0)disk(0)fdisk(x)\path
 228          */
 229         p = p + 6;
 230         DriveNumber = atoi(p);
 231     }
 232     else if (_strnicmp(p, "rdisk(", 6) == 0)
 233     {
 234         /*
 235          * Hard disk path:
 236          *  multi(0)disk(0)rdisk(x)partition(y)\path
 237          */
 238         p = p + 6;
 239         DriveNumber = atoi(p) + 0x80;
 240     }
 241
 242     return DriveNumber;
 243 }
 244 #endif