88 lines
2.5 KiB
C++
88 lines
2.5 KiB
C++
/**
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* PROJECT: ExectOS
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* COPYRIGHT: See COPYING.md in the top level directory
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* FILE: xtldr/bootutil.cc
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* DESCRIPTION: Helper functions used by the boot protocol during system startup
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* DEVELOPERS: Aiken Harris <harraiken91@gmail.com>
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*/
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#include <xtldr.hh>
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/**
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* Checks if a specific option exists in the list of provided boot parameters.
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*
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* @param Parameters
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* A pointer to the wide-character string containing the boot parameters, separated by spaces.
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*
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* @param Needle
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* A pointer to the wide-character string representing the kernel option to find.
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*
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* @return This routine returns TRUE if the option is found, otherwise FALSE.
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*
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* @since XT 1.0
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*/
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XTCDECL
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BOOLEAN
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BootUtils::GetBooleanParameter(IN PCWSTR Parameters,
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IN PCWSTR Needle)
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{
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PCWSTR CurrentPosition, TokenEnd, TokenStart;
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SIZE_T NeedleLength, TokenLength;
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/* Validate input data and ensure the option is not an empty string */
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if(Parameters == NULLPTR || Needle == NULLPTR || *Needle == L'\0')
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{
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/* One of the parameters was invalid */
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return FALSE;
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}
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CurrentPosition = Parameters;
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NeedleLength = RTL::WideString::WideStringLength(Needle, 0);
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/* Iterate through the entire parameters string */
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while(*CurrentPosition != L'\0')
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{
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/* Skip any leading whitespace to find the start of the token */
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while(*CurrentPosition == L' ')
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{
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CurrentPosition++;
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}
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/* Check if end of the string has been reached */
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if(*CurrentPosition == L'\0')
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{
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/* End of string reached, no more tokens */
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break;
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}
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/* Identify the boundaries of the current token */
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TokenStart = CurrentPosition;
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TokenEnd = TokenStart;
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while(*TokenEnd != L'\0' && *TokenEnd != L' ')
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{
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TokenEnd++;
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}
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/* Calculate the length of the token found */
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TokenLength = TokenEnd - TokenStart;
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/* Compare the token length */
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if(TokenLength == NeedleLength)
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{
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/* Length matches, compare the strings */
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if(RTL::WideString::CompareWideStringInsensitive(TokenStart, Needle, NeedleLength) == 0)
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{
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/* A match was found */
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return TRUE;
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}
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}
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/* Move the position past the current token to continue the search */
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CurrentPosition = TokenEnd;
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}
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/* No match was found */
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return FALSE;
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}
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