NT4/private/ole32/stg/ref/wcsnicmp.c
2020-09-30 17:12:29 +02:00

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);
}