drivemap.c File Reference

#include <freeldr.h>
#include <debug.h>

Include dependency graph for drivemap.c:

Go to the source code of this file.

Functions
	DBG_DEFAULT_CHANNEL (DISK)
BOOLEAN	DriveMapIsValidDriveString (PCSTR DriveString)
UCHAR	DriveMapGetBiosDriveNumber (PCSTR DeviceName)

Function Documentation

DBG_DEFAULT_CHANNEL()

DBG_DEFAULT_CHANNEL

(

DISK

)

DriveMapGetBiosDriveNumber()

UCHAR DriveMapGetBiosDriveNumber

(

PCSTR

DeviceName

)

Definition at line 66 of file drivemap.c.

{
    UCHAR BiosDriveNumber = 0;
 
    TRACE("DriveMapGetBiosDriveNumber(%s)\n", DeviceName);
 
    // If they passed in a number string then just
    // convert it to decimal and return it
    if (DeviceName[0] >= '0' && DeviceName[0] <= '9')
    {
        return (UCHAR)strtoul(DeviceName, NULL, 0);
    }
 
    // Convert the drive number string into a number
    // 'hd1' = 1
    BiosDriveNumber = atoi(&DeviceName[2]);
 
    // If it's a hard disk then set the high bit
    if ((DeviceName[0] == 'h' || DeviceName[0] == 'H') &&
        (DeviceName[1] == 'd' || DeviceName[1] == 'D'))
    {
        BiosDriveNumber |= 0x80;
    }
 
    return BiosDriveNumber;
}

DriveMapIsValidDriveString()

BOOLEAN DriveMapIsValidDriveString

(

PCSTR

DriveString

)

Definition at line 34 of file drivemap.c.

{
    ULONG Index;
 
    // Now verify that the user has given us appropriate strings
    if ((strlen(DriveString) < 3) ||
        ((DriveString[0] != 'f') && (DriveString[0] != 'F') &&
         (DriveString[0] != 'h') && (DriveString[0] != 'H')) ||
        ((DriveString[1] != 'd') && (DriveString[1] != 'D')))
    {
        return FALSE;
    }
 
    // Now verify that the user has given us appropriate numbers
    // Make sure that only numeric characters were given
    for (Index = 2; Index < strlen(DriveString); Index++)
    {
        if (DriveString[Index] < '0' || DriveString[Index] > '9')
        {
            return FALSE;
        }
    }
 
    // Now make sure that they are not outrageous values (i.e. hd90874)
    if ((atoi(&DriveString[2]) < 0) || (atoi(&DriveString[2]) > 0xff))
    {
        return FALSE;
    }
 
    return TRUE;
}