oslist.h File Reference

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Classes
struct	tagOperatingSystemItem

Macros
#define	TAG_STRING   ' rtS'

Typedefs
typedef struct tagOperatingSystemItem	OperatingSystemItem

Functions
OperatingSystemItem *	InitOperatingSystemList (_Out_ PULONG OperatingSystemCount, _Out_ PULONG DefaultOperatingSystem)

Macro Definition Documentation

TAG_STRING

#define TAG_STRING   ' rtS'

Definition at line 22 of file oslist.h.

Typedef Documentation

OperatingSystemItem

typedef struct tagOperatingSystemItem OperatingSystemItem

Function Documentation

InitOperatingSystemList()

OperatingSystemItem * InitOperatingSystemList	(	_Out_ PULONG	OperatingSystemCount,
		_Out_ PULONG	DefaultOperatingSystem
	)

Definition at line 46 of file oslist.c.

{
    OperatingSystemItem* Items;
    PCSTR DefaultOSName;
    ULONG DefaultOS = 0;
    ULONG Count;
    ULONG i;
    ULONG_PTR OsSectionId, SectionId;
    PCHAR TitleStart, TitleEnd;
    PCSTR OsLoadOptions;
    BOOLEAN HadSection;
    BOOLEAN HadNoBootType;
    CHAR SettingName[260];
    CHAR SettingValue[260];
    CHAR BootType[80];
    CHAR TempBuffer[_countof(SettingValue)];
 
    /* Open the [Operating Systems] section */
    if (!IniOpenSection("Operating Systems", &OsSectionId))
        return NULL;
 
    /* Count the number of operating systems in the section */
    Count = IniGetNumSectionItems(OsSectionId);
 
    /* Allocate memory to hold operating system lists */
    Items = FrLdrHeapAlloc(Count * sizeof(OperatingSystemItem), TAG_OS_ITEM);
    if (!Items)
        return NULL;
 
    /* Retrieve the default OS */
    DefaultOSName = GetBootMgrInfo()->DefaultOs;
 
    /* Now loop through the operating system section and load each item */
    for (i = 0; i < Count; ++i)
    {
        IniReadSettingByNumber(OsSectionId, i,
                               SettingName, sizeof(SettingName),
                               SettingValue, sizeof(SettingValue));
        if (!*SettingName)
        {
            ERR("Invalid OS entry %lu, skipping.\n", i);
            continue;
        }
 
        /* Retrieve the start and end of the title */
        TitleStart = SettingValue;
        /* Trim any leading whitespace and quotes */
        while (*TitleStart == ' ' || *TitleStart == '\t' || *TitleStart == '"')
            ++TitleStart;
        TitleEnd = TitleStart;
        /* Go up to the first last quote */
        while (*TitleEnd != ANSI_NULL && *TitleEnd != '"')
            ++TitleEnd;
 
        /* NULL-terminate the title */
        if (*TitleEnd)
            *TitleEnd++ = ANSI_NULL; // Skip the quote too.
 
        /* Retrieve the options after the quoted title */
        if (*TitleEnd)
        {
            /* Trim any trailing whitespace and quotes */
            while (*TitleEnd == ' ' || *TitleEnd == '\t' || *TitleEnd == '"')
                ++TitleEnd;
        }
        OsLoadOptions = (*TitleEnd ? TitleEnd : NULL);
 
        // TRACE("\n"
              // "SettingName   = '%s'\n"
              // "TitleStart    = '%s'\n"
              // "OsLoadOptions = '%s'\n",
              // SettingName, TitleStart, OsLoadOptions);
 
        /* Find the default OS item while we haven't got one */
        if (DefaultOSName && _stricmp(DefaultOSName, SettingName) == 0)
        {
            DefaultOS = i;
            DefaultOSName = NULL; // We have found the first one, don't search for others.
        }
 
        /*
         * Determine whether this is a legacy operating system entry of the form:
         *
         * [Operating Systems]
         * ArcOsLoadPartition="LoadIdentifier" /List /of /Options
         *
         * and if so, convert it into a new operating system INI entry:
         *
         * [Operating Systems]
         * SectionIdentifier="LoadIdentifier"
         *
         * [SectionIdentifier]
         * BootType=...
         * SystemPath=ArcOsLoadPartition
         * Options=/List /of /Options
         *
         * The "BootType" value is heuristically determined from the form of
         * the ArcOsLoadPartition: if this is an ARC path, the "BootType" value
         * is "Windows", otherwise if this is a DOS path the "BootType" value
         * is "BootSector". This ensures backwards-compatibility with NTLDR.
         */
 
        /* Try to open the operating system section in the .ini file */
        SectionId = 0;
        HadSection = IniOpenSection(SettingName, &SectionId);
        if (HadSection)
        {
            /* This is a new OS entry: try to read the boot type */
            IniReadSettingByName(SectionId, "BootType", BootType, sizeof(BootType));
        }
        else
        {
            /* This is a legacy OS entry: no explicit BootType specified, we will infer one */
            *BootType = ANSI_NULL;
        }
 
        /* Check whether we have got a BootType value; if not, try to infer one */
        HadNoBootType = (*BootType == ANSI_NULL);
        if (HadNoBootType)
        {
#ifdef _M_IX86
            ULONG FileId;
            if (ArcOpen(SettingName, OpenReadOnly, &FileId) == ESUCCESS)
            {
                ArcClose(FileId);
                strcpy(BootType, "BootSector");
            }
            else
#endif
            {
                strcpy(BootType, "Windows");
            }
        }
 
        /* This is a legacy OS entry: convert it into a new OS entry */
        if (!HadSection)
        {
            TIMEINFO* TimeInfo;
 
            /* Save the system path from the original SettingName (overwritten below) */
            RtlStringCbCopyA(TempBuffer, sizeof(TempBuffer), SettingName);
 
            /* Generate a unique section name */
            TimeInfo = ArcGetTime();
            if (_stricmp(BootType, "BootSector") == 0)
            {
                RtlStringCbPrintfA(SettingName, sizeof(SettingName),
                                   "BootSectorFile%u%u%u%u%u%u",
                                   TimeInfo->Year, TimeInfo->Day, TimeInfo->Month,
                                   TimeInfo->Hour, TimeInfo->Minute, TimeInfo->Second);
            }
            else if (_stricmp(BootType, "Windows") == 0)
            {
                RtlStringCbPrintfA(SettingName, sizeof(SettingName),
                                   "Windows%u%u%u%u%u%u",
                                   TimeInfo->Year, TimeInfo->Day, TimeInfo->Month,
                                   TimeInfo->Hour, TimeInfo->Minute, TimeInfo->Second);
            }
            else
            {
                ASSERT(FALSE);
            }
 
            /* Add the section */
            if (!IniAddSection(SettingName, &SectionId))
            {
                ERR("Could not convert legacy OS entry %lu, skipping.\n", i);
                continue;
            }
 
            /* Add the system path */
            if (_stricmp(BootType, "BootSector") == 0)
            {
                if (!IniAddSettingValueToSection(SectionId, "BootSectorFile", TempBuffer))
                {
                    ERR("Could not convert legacy OS entry %lu, skipping.\n", i);
                    continue;
                }
            }
            else if (_stricmp(BootType, "Windows") == 0)
            {
                if (!IniAddSettingValueToSection(SectionId, "SystemPath", TempBuffer))
                {
                    ERR("Could not convert legacy OS entry %lu, skipping.\n", i);
                    continue;
                }
            }
            else
            {
                ASSERT(FALSE);
            }
 
            /* Add the OS options */
            if (OsLoadOptions && !IniAddSettingValueToSection(SectionId, "Options", OsLoadOptions))
            {
                ERR("Could not convert legacy OS entry %lu, skipping.\n", i);
                continue;
            }
        }
 
        /* Add or modify the BootType if needed */
        if (HadNoBootType && !IniModifySettingValue(SectionId, "BootType", BootType))
        {
            ERR("Could not fixup the BootType entry for OS '%s', ignoring.\n", SettingName);
        }
 
        /*
         * If this is a new OS entry, but some options were given appended to
         * the OS entry item, append them instead to the "Options=" value.
         */
        if (HadSection && OsLoadOptions && *OsLoadOptions)
        {
            /* Read the original "Options=" value */
            *TempBuffer = ANSI_NULL;
            if (!IniReadSettingByName(SectionId, "Options", TempBuffer, sizeof(TempBuffer)))
                TRACE("No 'Options' value found for OS '%s', ignoring.\n", SettingName);
 
            /* Concatenate the options together */
            RtlStringCbCatA(TempBuffer, sizeof(TempBuffer), " ");
            RtlStringCbCatA(TempBuffer, sizeof(TempBuffer), OsLoadOptions);
 
            /* Save them */
            if (!IniModifySettingValue(SectionId, "Options", TempBuffer))
                ERR("Could not modify the options for OS '%s', ignoring.\n", SettingName);
        }
 
        /* Copy the OS section ID and its identifier */
        Items[i].SectionId = SectionId;
        Items[i].LoadIdentifier = CopyString(TitleStart);
        // TRACE("We did Items[%lu]: SectionName = '%s' (SectionId = 0x%p), LoadIdentifier = '%s'\n",
              // i, SettingName, Items[i].SectionId, Items[i].LoadIdentifier);
    }
 
    /* Return success */
    *OperatingSystemCount = Count;
    *DefaultOperatingSystem = DefaultOS;
    return Items;
}

Referenced by RunLoader().