65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/***
|
|
*wcsnicmp.c - compare first n characters of two wide character strings with
|
|
* case insensitivity
|
|
*
|
|
* Copyright (c) 1985-1988, Microsoft Corporation. All rights reserved.
|
|
*
|
|
*Purpose:
|
|
* defines wcsnicmp() - compare first n characters of two wide character
|
|
* strings for lexical order with case insensitivity.
|
|
*
|
|
*Revision History:
|
|
*
|
|
*******************************************************************************/
|
|
|
|
#include <wchar.h>
|
|
/***
|
|
*wchar_t wcUp(wc) - upper case wide character
|
|
*
|
|
*/
|
|
|
|
static wchar_t wcUp(wchar_t wc)
|
|
{
|
|
if ('a' <= wc && wc <= 'z')
|
|
wc += (wchar_t)('A' - 'a');
|
|
|
|
return(wc);
|
|
}
|
|
|
|
/***
|
|
*int wcsnicmp(first, last, count) - compare first count wide characters of wide
|
|
* character strings with case insensitivity.
|
|
*
|
|
*Purpose:
|
|
* Compares two wide character strings for lexical order. The comparison
|
|
* stops after: (1) a difference between the strings is found, (2) the end
|
|
* of the strings is reached, or (3) count characters have been
|
|
* compared.
|
|
*
|
|
*Entry:
|
|
* char *first, *last - wide character strings to compare
|
|
* unsigned count - maximum number of wide characters to compare
|
|
*
|
|
*Exit:
|
|
* returns <0 if first < last
|
|
* returns 0 if first == last
|
|
* returns >0 if first > last
|
|
*
|
|
*Exceptions:
|
|
*
|
|
*******************************************************************************/
|
|
|
|
int _CRTAPI1 wcsnicmp(const wchar_t * first, const wchar_t * last, size_t count)
|
|
{
|
|
if (!count)
|
|
return 0;
|
|
|
|
while (--count && *first && wcUp(*first) == wcUp(*last))
|
|
{
|
|
first++;
|
|
last++;
|
|
}
|
|
|
|
return wcUp(*first) - wcUp(*last);
|
|
}
|