33 lines
759 B
C
33 lines
759 B
C
/* This source code was extracted from the Q8 package created and placed
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in the PUBLIC DOMAIN by Doug Gwyn <gwyn@arl.mil>
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last edit: 1999/11/05 gwyn@arl.mil
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Implements subclause 7.24 of ISO/IEC 9899:1999 (E).
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It supports an encoding where all char codes are mapped
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to the *same* code values within a wchar_t or wint_t,
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so long as no other wchar_t codes are used by the program.
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*/
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#include <wchar.h>
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int
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wmemcmp(s1, s2, n)
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register const wchar_t *s1;
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register const wchar_t *s2;
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size_t n;
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{
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if ( n == 0 || s1 == s2 )
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return 0; /* even for NULL pointers */
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if ( (s1 != NULL) != (s2 != NULL) )
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return s2 == NULL ? 1 : -1; /* robust */
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for ( ; n > 0; ++s1, ++s2, --n )
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if ( *s1 != *s2 )
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return *s1 - *s2;
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return 0;
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}
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