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Improvements in string and wide string support

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* Implement RtlCompareString(), RtlCompareStringInsensitive(), RtlCompareWideString() and RtlCompareWideStringInsensitive()
* Rename some routines t omatch naming conventions
* Switch to CHAR in string operations
This commit is contained in:
Rafal Kupiec
2023-12-06 22:47:54 +01:00
parent ec63fe3fa6
commit d7fbe531fd
7 changed files with 294 additions and 87 deletions
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171
xtoskrnl/rtl/widestr.c
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@@ -19,17 +19,17 @@
* Wide string to be compared.
*
* @param Length
* Maximum number of characters to compare. If no limit set, it compares whole strings.
* Maximum number of characters to compare. If no limit set, it compares whole wide strings.
*
* @return Integral value indicating the relationship between the wide strings.
*
* @since XT 1.0
*/
XTCDECL
INT
RtlWideStringCompare(IN CONST PWCHAR String1,
SIZE_T
RtlCompareWideString(IN CONST PWCHAR String1,
IN CONST PWCHAR String2,
IN CONST SIZE_T Length)
IN SIZE_T Length)
{
SIZE_T Index;
@@ -42,22 +42,89 @@ RtlWideStringCompare(IN CONST PWCHAR String1,
break;
}
/* Check if string characters are equal */
/* Check if wide string characters are equal */
if(String1[Index] != String2[Index])
{
/* Different characters found */
return String1[Index] < String2[Index] ? -1 : 1;
}
/* Check if end of string reached */
/* Check if end of wide string reached */
if(!String1[Index] || !String2[Index])
{
/* Equal strings until the end of one of them */
/* Equal wide strings until the end of one of them */
return 0;
}
}
/* Strings are equal */
/* Wide strings are equal */
return 0;
}
/**
* Compares at most specified number of characters of two C wide strings, while ignoring differences in case.
*
* @param String1
* Wide string to be compared.
*
* @param String2
* Wide string to be compared.
*
* @param Length
* Maximum number of characters to compare. If no limit set, it compares whole wide strings.
*
* @return Integral value indicating the relationship between the wide strings.
*
* @since XT 1.0
*/
XTCDECL
SIZE_T
RtlCompareWideStringInsensitive(IN CONST PWCHAR String1,
IN CONST PWCHAR String2,
IN SIZE_T Length)
{
WCHAR Character1;
WCHAR Character2;
ULONG Index = 0;
/* Iterate through the wide strings */
while(String1[Index] != '\0' && String2[Index] != '\0')
{
/* Check if length limit reached */
if(Index != 0 && Index == Length)
{
/* Skip checking next characters */
break;
}
/* Get the characters */
Character1 = String1[Index];
Character2 = String2[Index];
/* Lowercase wide string1 character if needed */
if(String1[Index] >= 'A' && String1[Index] <= 'Z')
{
Character1 = String1[Index] - 'A' + 'a';
}
/* Lowercase wide string2 character if needed */
if(String2[Index] >= 'A' && String2[Index] <= 'Z')
{
Character2 = String2[Index] - 'A' + 'a';
}
/* Compare the characters */
if(Character1 != Character2)
{
/* Wide strings are not equal */
return Character1 > Character2 ? 1 : -1;
}
/* Get next character */
Index++;
}
/* Wide strings are equal */
return 0;
}
@@ -79,7 +146,7 @@ RtlWideStringCompare(IN CONST PWCHAR String1,
*/
XTCDECL
PWCHAR
RtlWideStringConcatenate(OUT PWCHAR Destination,
RtlConcatenateWideString(OUT PWCHAR Destination,
IN PWCHAR Source,
IN SIZE_T Count)
{
@@ -120,48 +187,6 @@ RtlWideStringConcatenate(OUT PWCHAR Destination,
return DestString;
}
/**
* Calculates the length of a given wide string.
*
* @param String
* Pointer to the null-terminated wide string to be examined.
*
* @param MaxLength
* Maximum number of wide characters to examine. If no limit set, it examines whole string.
*
* @return The length of the null-terminated wide string.
*
* @since: XT 1.0
*/
XTCDECL
SIZE_T
RtlWideStringLength(IN CONST PWCHAR String,
IN SIZE_T MaxLength)
{
SIZE_T Length;
/* Check if NULL pointer passed */
if(String == NULL)
{
return 0;
}
/* Iterate through the wide string */
for(Length = 0; ; Length++)
{
/* Check if NULL found or max length limit reached */
if((Length != 0 && Length == MaxLength) || !String[Length])
{
/* Finish examination */
break;
}
}
/* Return wide string length */
return Length;
}
/**
* Finds the next token in a null-terminated wide string.
*
@@ -180,7 +205,7 @@ RtlWideStringLength(IN CONST PWCHAR String,
*/
XTCDECL
PWCHAR
RtlWideStringTokenize(IN PWCHAR String,
RtlTokenizeWideString(IN PWCHAR String,
IN CONST PWCHAR Delimiter,
IN OUT PWCHAR *SavePtr)
{
@@ -231,3 +256,45 @@ RtlWideStringTokenize(IN PWCHAR String,
while(SpanChar != L'\0');
}
}
/**
* Calculates the length of a given wide string.
*
* @param String
* Pointer to the null-terminated wide string to be examined.
*
* @param MaxLength
* Maximum number of wide characters to examine. If no limit set, it examines whole string.
*
* @return The length of the null-terminated wide string.
*
* @since: XT 1.0
*/
XTCDECL
SIZE_T
RtlWideStringLength(IN CONST PWCHAR String,
IN SIZE_T MaxLength)
{
SIZE_T Length;
/* Check if NULL pointer passed */
if(String == NULL)
{
return 0;
}
/* Iterate through the wide string */
for(Length = 0; ; Length++)
{
/* Check if NULL found or max length limit reached */
if((Length != 0 && Length == MaxLength) || !String[Length])
{
/* Finish examination */
break;
}
}
/* Return wide string length */
return Length;
}