102 lines
2.2 KiB
C
102 lines
2.2 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: xtoskrnl/rtl/string.c
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* DESCRIPTION: String support
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* DEVELOPERS: Rafal Kupiec <belliash@codingworkshop.eu.org>
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*/
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#include <xtos.h>
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/**
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* Calculates the length of a given string.
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*
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* @param String
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* Pointer to the null-terminated string to be examined.
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*
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* @param MaxLength
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* Maximum number of characters to examine. If no limit set, it examines whole string.
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*
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* @return The length of the null-terminated string.
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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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SIZE_T
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RtlStringLength(IN CONST PUCHAR String,
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IN SIZE_T MaxLength)
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{
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SIZE_T Length;
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/* Check if NULL pointer passed */
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if(String == NULL)
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{
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return 0;
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}
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/* Iterate through the wide string */
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for(Length = 0; ; Length++)
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{
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/* Check if NULL found or max length limit reached */
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if((Length != 0 && Length == MaxLength) || !String[Length])
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{
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/* Finish examination */
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break;
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}
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}
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/* Return wide string length */
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return Length;
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}
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/**
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* Converts a multibyte character string to its wide character representation.
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*
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* @param Destination
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* Pointer to wide character array where the wide string will be stored
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*
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* @param Source
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* Pointer to the first element of a multibyte string to convert.
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*
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* @param Length
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* Number of characters in the source string.
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*
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* @return Returns the number of wide characters written to the destination array on success, or -1 on error.
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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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INT
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RtlStringToWideString(OUT PWCHAR Destination,
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IN CONST PUCHAR *Source,
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IN SIZE_T Length)
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{
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PUCHAR LocalSource = *Source;
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SIZE_T Count = Length;
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if(Destination == NULL)
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{
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return 0;
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}
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while(Count)
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{
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if((*Destination = (UCHAR)*LocalSource) == 0)
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{
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LocalSource = NULL;
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break;
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}
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if(*Destination >= 0x80)
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{
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return -1;
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}
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LocalSource++;
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Destination++;
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Count--;
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}
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return Length - Count;
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}
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