memicmp.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 55 行

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*                            Open Watcom Project
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#include "variety.h"
#include <string.h>
#include <ctype.h>

_WCRTLINK int memicmp( const void *in_s1, const void *in_s2, size_t len )
    {
        const unsigned char *   s1 = (const unsigned char *)in_s1;
        const unsigned char *   s2 = (const unsigned char *)in_s2;
        unsigned char           c1;
        unsigned char           c2;

        for( ; len; --len )  {
            c1 = *s1;
            c2 = *s2;
            if( c1 >= 'A'  &&  c1 <= 'Z' )  c1 += 'a' - 'A';
            if( c2 >= 'A'  &&  c2 <= 'Z' )  c2 += 'a' - 'A';
            if( c1 != c2 ) return( c1 - c2 );
            ++s1;
            ++s2;
        }
        return( 0 );    /* both operands are equal */
    }