static char * AcpiExAllocateNameString	(	UINT32	PrefixCount,
		UINT32	NumNameSegs
	)		`[static]`

Definition at line 157 of file exnames.c.

Referenced by AcpiExGetNameString().

{
    char                    *TempPtr;
    char                    *NameString;
    UINT32                   SizeNeeded;

    ACPI_FUNCTION_TRACE (ExAllocateNameString);


    /*
     * Allow room for all \ and ^ prefixes, all segments and a MultiNamePrefix.
     * Also, one byte for the null terminator.
     * This may actually be somewhat longer than needed.
     */
    if (PrefixCount == ACPI_UINT32_MAX)
    {
        /* Special case for root */

        SizeNeeded = 1 + (ACPI_NAME_SIZE * NumNameSegs) + 2 + 1;
    }
    else
    {
        SizeNeeded = PrefixCount + (ACPI_NAME_SIZE * NumNameSegs) + 2 + 1;
    }

    /*
     * Allocate a buffer for the name.
     * This buffer must be deleted by the caller!
     */
    NameString = ACPI_ALLOCATE (SizeNeeded);
    if (!NameString)
    {
        ACPI_ERROR ((AE_INFO,
            "Could not allocate size %u", SizeNeeded));
        return_PTR (NULL);
    }

    TempPtr = NameString;

    /* Set up Root or Parent prefixes if needed */

    if (PrefixCount == ACPI_UINT32_MAX)
    {
        *TempPtr++ = AML_ROOT_PREFIX;
    }
    else
    {
        while (PrefixCount--)
        {
            *TempPtr++ = AML_PARENT_PREFIX;
        }
    }


    /* Set up Dual or Multi prefixes if needed */

    if (NumNameSegs > 2)
    {
        /* Set up multi prefixes   */

        *TempPtr++ = AML_MULTI_NAME_PREFIX_OP;
        *TempPtr++ = (char) NumNameSegs;
    }
    else if (2 == NumNameSegs)
    {
        /* Set up dual prefixes */

        *TempPtr++ = AML_DUAL_NAME_PREFIX;
    }

    /*
     * Terminate string following prefixes. AcpiExNameSegment() will
     * append the segment(s)
     */
    *TempPtr = 0;

    return_PTR (NameString);
}

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