63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
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/***
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*strncmp.c - compare first n characters of two strings
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*
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* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines strncmp() - compare first n characters of two strings
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* for lexical order.
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*
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*Revision History:
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* 05-31-89 JCR C version created.
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* 02-27-90 GJF Fixed calling type, #include <cruntime.h>, fixed
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* copyright.
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* 10-02-90 GJF New-style function declarator.
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* 10-11-91 GJF Bug fix! Comparison of final bytes must use unsigned
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* chars.
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* 09-02-93 GJF Replaced _CALLTYPE1 with __cdecl.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <string.h>
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/***
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*int strncmp(first, last, count) - compare first count chars of strings
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*
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*Purpose:
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* Compares two strings for lexical order. The comparison stops
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* 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 - strings to compare
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* unsigned count - maximum number of 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 __cdecl strncmp (
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const char * first,
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const char * last,
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size_t count
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)
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{
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if (!count)
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return(0);
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while (--count && *first && *first == *last)
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{
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first++;
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last++;
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}
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return( *(unsigned char *)first - *(unsigned char *)last );
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}
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