78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
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/***
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*wcsicmp.c - compares two wide character strings with 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 wcsicmp() - compares two wide character strings for lexical
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* order with case insensitivity.
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*
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*Revision History:
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* 11-Mar-92 CarlH Created.
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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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*Notes:
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* This was copied from AlexT's version of wcsnicmp.c from the Win4
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* common project.
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*/
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static wchar_t wcUp(wchar_t wc)
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{
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if ('a' <= wc && wc <= 'z')
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wc += (wchar_t)('A' - 'a');
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return(wc);
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}
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/***
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*wcsicmp - compare two wide character strings with case insensitivity,
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* returning less than, equal to, or greater than
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*
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*Purpose:
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* WCSICMP compares two wide character strings with case insensitivity
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* and returns an integer to indicate whether the first is less than
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* the second, the two are equal, or whether the first is greater than
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* the second.
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*
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* Comparison is done byte by byte on an UNSIGNED basis with lower to
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* upper case mapping by wcUp. Null (0) is less than any other
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* character (1-0xffff).
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*
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*Entry:
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* const wchar_t * src - string for left-hand side of comparison
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* const wchar_t * dst - string for right-hand side of comparison
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*
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*Exit:
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* returns -1 if src < dst
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* returns 0 if src == dst
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* returns +1 if src > dst
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*
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*Exceptions:
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*
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*******************************************************************************/
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int _CRTAPI1 wcsicmp(const wchar_t * src, const wchar_t * dst)
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{
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int ret = 0 ;
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while( ! (ret = wcUp(*src) - wcUp(*dst)) && *dst)
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++src, ++dst;
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if ( ret < 0 )
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ret = -1 ;
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else if ( ret > 0 )
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ret = 1 ;
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return ret;
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}
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