123 lines
2.9 KiB
C
123 lines
2.9 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: sdk/xtrtlib/widestr.c
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* DESCRIPTION: Wide string support
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* DEVELOPERS: Rafal Kupiec <belliash@codingworkshop.eu.org>
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*/
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#include "xtkmapi.h"
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/**
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* Compares at most specified number of characters of two C wide strings.
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*
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* @param String1
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* Wide string to be compared.
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*
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* @param String2
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* Wide string to be compared.
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*
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* @param Length
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* Maximum number of characters to compare.
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*
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* @return Integral value indicating the relationship between the wide strings.
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*
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* @since XT 1.0
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*/
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INT
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RtlWideStringCompare(IN CONST PWCHAR String1,
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IN CONST PWCHAR String2,
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IN CONST ULONG Length)
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{
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ULONG Index;
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/* Iterate through the strings */
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for(Index = 0; Index < Length; Index++) {
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/* Check if string characters are equal */
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if(String1[Index] != String2[Index])
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{
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/* Different characters found */
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return String1[Index] < String2[Index] ? -1 : 1;
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}
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/* Check if end of string reached */
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if(!String1[Index])
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{
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/* Equal strings until the end of String1 */
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return 0;
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}
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}
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/* Strings are equal */
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return 0;
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}
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/*
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* Finds the next token in a null-terminated wide string.
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*
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* @param String
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* Pointer to the null-terminated wide string to tokenize.
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*
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* @param Delimiter
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* Pointer to the null-terminated wide string identifying delimiters.
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*
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* @param SavePtr
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* Pointer to an object used to store routine internal state.
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*
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* @return Pointer to the beginning of the next token or NULL if there are no more tokens.
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*
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* @since: XT 1.0
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*/
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PWCHAR
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RtlWideStringTokenize(IN PWCHAR String,
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IN CONST PWCHAR Delimiter,
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IN OUT PWCHAR *SavePtr)
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{
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PWCHAR Span, Token;
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WCHAR Char, SpanChar;
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/* Check if there is anything to tokenize */
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if(String == NULL && (String = *SavePtr) == NULL)
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{
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/* Empty string given */
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return (NULL);
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}
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/* Check non-delimiter characters */
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Char = *String++;
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if(Char == L'\0')
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{
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*SavePtr = NULL;
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return (NULL);
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}
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Token = String - 1;
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/* Scan token for delimiters */
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for(;;)
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{
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Char = *String++;
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Span = (WCHAR *)Delimiter;
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do
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{
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if((SpanChar = *Span++) == Char)
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{
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if(Char == L'\0')
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{
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String = NULL;
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}
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else
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{
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String[-1] = L'\0';
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}
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/* Store pointer to the next token */
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*SavePtr = String;
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/* Return token */
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return Token;
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}
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}
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while(SpanChar != L'\0');
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}
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}
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