strcmp core dumps Post: 100305

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Top Forums Programming strcmp core dumps Post 100305 by hegemaro on Sunday 26th of February 2006 09:23:34 AM

02-26-2006

Registered User

My obsessive-compulsiveness is shining through. Combing both Jim's post and mine, we can get a "null strcmp" function that is comparable to the strcmp library function in performance.

It is identical to the Solaris strcmp function returning the ordinal difference between the first pair of non-matching bytes. (As I recall, the AIX implementation returns a 0 for a match and 1 for a non-match). This function returns -256 if S1 is NULL, 256 if S2 is NULL, and 0 if both S1 and S2 are NULL.

Code:

    int nstrcmp ( void * S1 , void * S2 )
    {
        if ( S1 == NULL )
        {
            S2 = ( S2 ? (void *) 256 : S2 );
        }
        else if ( S2 == NULL )
        {
            S1 = (void *) 256;
        }
        else
        {
            unsigned char * s1 = (unsigned char *) S1,
                          * s2 = (unsigned char *) S2;
   

            while ( *s1 )
            {
                if ( *s1 != *s2 )
                {
                    break;
                }
                s1++;
                s2++;
            }

            return ( (int) (*s1 - *s2) );
        }

        return ( (int) (S1 - S2) );
    }

hegemaro

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LEARN ABOUT MOJAVE

strncmp

STRCMP(3)						   BSD Library Functions Manual 						 STRCMP(3)

NAME

     strcmp, strncmp -- compare strings

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <string.h>

     int
     strcmp(const char *s1, const char *s2);

     int
     strncmp(const char *s1, const char *s2, size_t n);

DESCRIPTION

     The strcmp() and strncmp() functions lexicographically compare the null-terminated strings s1 and s2.

     The strncmp() function compares not more than n characters.  Because strncmp() is designed for comparing strings rather than binary data,
     characters that appear after a '' character are not compared.

RETURN VALUES

     The strcmp() and strncmp() functions return an integer greater than, equal to, or less than 0, according as the string s1 is greater than,
     equal to, or less than the string s2.  The comparison is done using unsigned characters, so that '200' is greater than ''.

SEE ALSO

     bcmp(3), memcmp(3), strcasecmp(3), strcoll(3), strxfrm(3), wcscmp(3)

STANDARDS

     The strcmp() and strncmp() functions conform to ISO/IEC 9899:1990 (``ISO C90'').

BSD
								 October 11, 2001							       BSD

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