64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
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/***
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*wcsnicmp.c - compare first n characters of two wide character strings with
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* case insensitivity
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*
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* Copyright (c) 1985-1988, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines wcsnicmp() - compare first n characters of two wide character
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* strings for lexical order with case insensitivity.
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*
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*Revision History:
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* 04-07-91 IanJa C version created.
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* 11-25-91 AlexT Modified from wcsncmp.c
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* 04-Mar-92 ChrisMay fixed signed/unsigned warning in wcUP()
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* 12-Mar-92 Fixed bug in wcsnicmp (used to return *first - *last)
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*
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*******************************************************************************/
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#include <stdlib.h>
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/***
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*wchar_t wcUp(wc) - upper case wide character
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*
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*/
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#define wcUp(wc) (('a' <= (wchar_t) (wc) && (wchar_t) (wc) <= 'z') ? \
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(wchar_t) (wc) + (wchar_t)('A' - 'a') : (wchar_t) (wc))
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/***
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*int wcsnicmp(first, last, count) - compare first count wide characters of wide
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* character strings with case insensitivity.
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*
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*Purpose:
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* Compares two wide character strings for lexical order. The comparison
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* stops after: (1) a difference between the strings is found, (2) the end
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* of the strings is reached, or (3) count characters have been
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* compared.
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*
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*Entry:
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* char *first, *last - wide character strings to compare
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* unsigned count - maximum number of wide characters to compare
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*
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*Exit:
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* returns <0 if first < last
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* returns 0 if first == last
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* returns >0 if first > last
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*
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*Exceptions:
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*
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*******************************************************************************/
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int _CRTAPI1 wcsnicmp(const wchar_t * first, const wchar_t * last, size_t count)
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{
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if (!count)
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return 0;
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while (--count && *first && wcUp(*first) == wcUp(*last))
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{
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first++;
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last++;
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}
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return wcUp(*first) - wcUp(*last);
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}
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