str_comp.c

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/* string compare function */

#include "fb.h"

FBCALL int fb_StrCompare
        (
                void *str1,
                ssize_t str1_size,
                void *str2,
                ssize_t str2_size
        )
{
        const char *str1_ptr, *str2_ptr;
        ssize_t str1_len, str2_len;
        int     res;

        /* both not null? */
        if( (str1 != NULL) && (str2 != NULL) )
        {
                FB_STRSETUP_FIX( str1, str1_size, str1_ptr, str1_len );
        FB_STRSETUP_FIX( str2, str2_size, str2_ptr, str2_len );

        res = FB_MEMCMP( str1_ptr,
                         str2_ptr,
                         ((str1_len < str2_len) ? str1_len : str2_len) );

        if( (res == 0) && (str1_len != str2_len) )
            res = (( str1_len > str2_len ) ? 1 : -1 );
        }
        /* left null? */
        else if( str1 == NULL )
        {
                /* right also null? return eq */
                if( str2 == NULL )
                        res = 0;
                else
                {
                        FB_STRSETUP_FIX( str2, str2_size, str2_ptr, str2_len );

                        /* is right empty? return eq */
                        if( str2_len == 0 )
                                res = 0;

                        /* else, return lt */
                        else
                                res = -1;
                }
        }
        /* only right is null */
        else
        {
                FB_STRSETUP_FIX( str1, str1_size, str1_ptr, str1_len );

                /* is left empty? return eq */
                if( str1_len == 0 )
                        res = 0;
                /* else, return gt */
                else
                        res = 1;
        }


        FB_STRLOCK();

        /* delete temps? */
        if( str1_size == -1 )
                fb_hStrDelTemp_NoLock( (FBSTRING *)str1 );
        if( str2_size == -1 )
                fb_hStrDelTemp_NoLock( (FBSTRING *)str2 );

        FB_STRUNLOCK();

        return res;
}